Motor Overhaul Procedures
1. DOCUMENTATION
1.1 Repair Forms
The motor will be accompanied by a Motor Repair Form from the purchaser which will list the perceived problems, the operating environment, the urgency of the repair, past problems where applicable, the required repair, cost constraints, missing parts and the person within the purchaser’s organization to be contacted about the repair.
1.2 File
The repairer will keep a copy of the Motor Repair Form and the Repairer’s Tracking Form in the file for the particular job.
2. INCOMING INSPECTION
2.1 Visual
A visual inspection shall be made to assess the general condition of the outside of the motor for cracks, broken welds and missing parts.
2.2 Insulation to Ground
An insulation resistance test to ground shall be performed, at a voltage suitable for the motor’s voltage rating and the apparent condition of the motor.
• The initial test voltage shall be 500 volts DC.
• For motors where there is more than one winding, the insulation shall also be tested between windings, at the test voltage appropriate to the lower voltage winding, with other windings grounded.
• The duration of the insulation test shall be one minute.
2.3 Bearings
The shaft shall be manually rotated to check for any obvious problems with the bearings or shaft.
3. DISMANTLING
3.1 Identify Problem
After the incoming inspection, the motor shall be dismantled to the extent needed to either fully identify or repair the problem, or to do the specified overhaul.
3.2 Markings
End brackets and frames shall be clearly match-marked with numerals or letters.
3.3 Parts Storage
Bolts and small parts shall be stored in dedicated containers and parts from other jobs shall not be kept with them.
3.4 Explosion Proof
For motors certified for hazardous locations, extra care shall be taken to ensure that joints and flame paths are not damaged during the work. If damage requiring other than normal repair is found, purchaser shall be notified before proceeding with repair.
3.5 Rotor Removal
For horizontal motors where the shaft rotor assembly is too heavy to be removed easily by hand, one or two cranes shall be used to move the shaft, with a close fitting pipe installed over one end of the shaft to act as a shaft extension. Attention shall be paid to the following:
• Care shall be taken that the slings do not damage the bearing surfaces or the rotor.
• Under no circumstances shall the stator windings be touched by any of the parts being
3.6 Bearing Removal
Used the puller to remove old baring out off shaft of rotor.
4. ROUTINE OVERHAULS
4.1 Testing
After dismantling, the following procedure shall be followed:
• Winding and cooling ducts shall be cleaned, dried and inspected.
• Winding insulation resistance shall be tested at 500 volts DC.
• The duration of the test shall be one minute. The minimum acceptable level after one minute, corrected to a 40°C reference temperature per IEEE 43, is 20 megohms. Levels less than 20 megohms shall be discussed with the purchaser.
• If satisfactory levels are not attained, the winding shall be recleaned and dried thoroughly at a temperature not exceeding 90°C (195°F), and then retested.
4.2 Cleaning
The components, including the stator windings, shall be cleaned with hot water and a suitable detergent after heavy deposits of dirt and grease have been removed by scraping and wiping.
If necessary, brushes shall be used to clean small passages in components. Solvents shall not be used to clean insulation, but may be used on mechanical components of the motor.
All components shall be thoroughly dried at a temperature less than 90°C (195°F), for as long as it takes to remove all signs of moisture. For windings, this will be indicated by the insulation resistance stabilizing after some hours of drying.
4.3 Repairs
After satisfactory insulation resistance has been attained, all loose or damaged wedges, slot sticks, coil supports etc., shall be replaced or repaired.
The routine overhaul of other parts of the motor shall return the parts to good condition.
4.4 Reassembly
The assembly of the motor after overhaul is covered in sub-section 11.
5. ROTOR TEST AND REPAIR
5.1 Testing
All rotors shall be given a test for damaged bars, whether the motor is suspect in this area or not. This test shall apply a stable single-phase voltage to the stator of the assembled motor while the shaft is slowly turned through at least one revolution. Any fluctuations of stator current in excess of 3 percent shall be investigated further.
For motors where electrical or mechanical problems with the rotor are suspected, more sophisticated tests shall be used. These include one or more of the following:
• Growler tests;
• Current analysis or vibration analysis of a loaded motor;
• Physical examination;
• Ultrasonic examination of the bars and end rings;
5.2 Cast Rotor Repair
Since repair of squirrel cages can be expensive, no work shall be done in this area without purchaser approval. A defective cast cage shall not be repaired without prior authorization from the purchaser.
6. SHAFT REPAIR
6.1 General
If information on the Motor Repair Form or any tests indicate that there may be a shaft problem, it shall be tested and repaired or replaced. If there is any risk or uncertainty in the proposed repair method, this shall be discussed with the purchaser prior to proceeding.
6.2 Requirements
When the work is completed, the shaft shall meet the following criteria:
• Total Indicated Run out. It shall be straight, with a Total Indicated Run out (TIR) when measured in V blocks, of no more than 0.051 mm (0.002 inch) for up to 41.3 mm (1.625 inch) shaft diameter and no more than 0.003 inch for larger diameters.
• No Cracks. The shaft shall have no cracks. If ultrasonic, magnetic particle, dye penetrant or other testing methods are needed to verify this, they shall be documented in repair records.
• Straightness. The shaft shall be straight, parallel and undamaged at the bearing areas. If any measurable but acceptable deviation from this is noted, it shall be documented in repair records.
7. ANTI-FRICTION BEARINGS
7.1 New Bearings
Anti-friction bearings shall always be replaced. New bearings shall be the same type as originally used, unless otherwise approved by the purchaser. If the bearing type, size, sealing, shielding or configuration is changed, this shall be noted on a supplemental nameplate.
7.2 Clearance
Unless otherwise specified by the manufacturer or purchaser, C3 clearance bearings shall be used for all bearings.
7.3 Tolerances
Fitting tolerances to the journals and housings shall be per manufacturer’s specifications. Out of tolerance fits shall be restored. (Reference ANSI/ABMA Std. 7-1995 as a guide.)
7.4 Heating
The bearing shall be heated, without use of direct flame, to approximately 94°C (200°F) to permit it to be slid easily onto the shaft up to the shoulder. Bearings with bores under 45mm may be press fit.
7.5 Grease
Greasable bearings shall be lubricated as specified in the EASA Recommended Practice for the Repair of Rotating Electrical Apparatus. Lubrication shall be in accordance with the motor manufacturer’s recommendations if available. Otherwise fill the cavity to 1/3 capacity. The lubricant shall be compatible with both the customer’s lubricant and the lubricant packed by the bearing manufacturer.
8. END BRACKETS
8.1 Requirements
End brackets shall fit snugly to the stator frame. Worn dowel holes and rabbet fits shall be repaired.
8.2 Tolerances
See section 7.3 for the fit of the outer diameter of anti-friction bearings to housings.
8.3 Repairs
Repairs to end bracket bearing housings shall be by building up the metal and machining to size. Welding, plating and sleeving are the accepted methods. Epoxies and other compounds shall not be used for locking bearings.
9. OTHER DEVICES
9.1 Fans
Fans shall be checked for cracks and fit to the shaft or rotor.
Fans shall be firmly fixed to the shaft or rotor by the original factory method, unless there has been corrosion between dissimilar metals, in which case a new method shall be proposed to the purchaser. Welding to the shaft is not permitted.
New fans shall be as supplied by the original manufacturer if available.
Fans used in motors for use in hazardous locations shall be made of material that will not cause sparking, either by impact or by build up of static electricity.
9.2 Leads
Leads shall be flexible and multistranded, and have at least the same cross sectional area as the original leads. Temperature class must be the same as original or better.
Main power and accessory leads shall be indelibly marked using the same marking systems as the incoming motor. Every effort shall be made to keep the original direction of rotation.
Lugs, if used, shall be suited for the application and have all cable strands in the lug. If crimp lugs are used, the correct make and style of die shall be used for the particular lug, and the correct compression applied.
9.3 Terminal Boxes
Terminal boxes shall be returned to original condition. In particular, the following items must be confirmed.
• Missing bolts and gaskets for both the cover and the motor-to-box joint shall be replaced.
• On motors certified for hazardous environments, the junction boxes shall be sealed off from the main body of the motor by a sealing compound approved by UL for this application.
• Damaged flanges shall be repaired. No paint or gaskets shall be left on the flanges of boxes for explosion-proof motors.
9.4 Space Heaters
Space heaters shall be tested for insulation resistance for one minute at 500 volts. A 10 megohm minimum resistance is acceptable.
They shall be tested for correct functioning.
10. BALANCING
The motor rotor shall be dynamically balanced in a balance stand before assembly of the motor. Balance criteria include the following:
• Half key. It shall be balanced with a half key in the keyway.
• Tolerance G2.5 (ISO 1940-1). Generally, the
Motor Overhaul Procedures
1. DOCUMENTATION
1.1 Repair Forms
The motor will be accompanied by a Motor Repair Form from the purchaser which will list the perceived problems, the operating environment, the urgency of the repair, past problems where applicable, the required repair, cost constraints, missing parts and the person within the purchaser’s organization to be contacted about the repair.
1.2 File
The repairer will keep a copy of the Motor Repair Form and the Repairer’s Tracking Form in the file for the particular job.
2. INCOMING INSPECTION
2.1 Visual
A visual inspection shall be made to assess the general condition of the outside of the motor for cracks, broken welds and missing parts.
2.2 Insulation to Ground
An insulation resistance test to ground shall be performed, at a voltage suitable for the motor’s voltage rating and the apparent condition of the motor.
• The initial test voltage shall be 500 volts DC.
• For motors where there is more than one winding, the insulation shall also be tested between windings, at the test voltage appropriate to the lower voltage winding, with other windings grounded.
• The duration of the insulation test shall be one minute.
2.3 Bearings
The shaft shall be manually rotated to check for any obvious problems with the bearings or shaft.
3. DISMANTLING
3.1 Identify Problem
After the incoming inspection, the motor shall be dismantled to the extent needed to either fully identify or repair the problem, or to do the specified overhaul.
3.2 Markings
End brackets and frames shall be clearly match-marked with numerals or letters.
3.3 Parts Storage
Bolts and small parts shall be stored in dedicated containers and parts from other jobs shall not be kept with them.
3.4 Explosion Proof
For motors certified for hazardous locations, extra care shall be taken to ensure that joints and flame paths are not damaged during the work. If damage requiring other than normal repair is found, purchaser shall be notified before proceeding with repair.
3.5 Rotor Removal
For horizontal motors where the shaft rotor assembly is too heavy to be removed easily by hand, one or two cranes shall be used to move the shaft, with a close fitting pipe installed over one end of the shaft to act as a shaft extension. Attention shall be paid to the following:
• Care shall be taken that the slings do not damage the bearing surfaces or the rotor.
• Under no circumstances shall the stator windings be touched by any of the parts being
3.6 Bearing Removal
Used the puller to remove old baring out off shaft of rotor.
4. ROUTINE OVERHAULS
4.1 Testing
After dismantling, the following procedure shall be followed:
• Winding and cooling ducts shall be cleaned, dried and inspected.
• Winding insulation resistance shall be tested at 500 volts DC.
• The duration of the test shall be one minute. The minimum acceptable level after one minute, corrected to a 40°C reference temperature per IEEE 43, is 20 megohms. Levels less than 20 megohms shall be discussed with the purchaser.
• If satisfactory levels are not attained, the winding shall be recleaned and dried thoroughly at a temperature not exceeding 90°C (195°F), and then retested.
4.2 Cleaning
The components, including the stator windings, shall be cleaned with hot water and a suitable detergent after heavy deposits of dirt and grease have been removed by scraping and wiping.
If necessary, brushes shall be used to clean small passages in components. Solvents shall not be used to clean insulation, but may be used on mechanical components of the motor.
All components shall be thoroughly dried at a temperature less than 90°C (195°F), for as long as it takes to remove all signs of moisture. For windings, this will be indicated by the insulation resistance stabilizing after some hours of drying.
4.3 Repairs
After satisfactory insulation resistance has been attained, all loose or damaged wedges, slot sticks, coil supports etc., shall be replaced or repaired.
The routine overhaul of other parts of the motor shall return the parts to good condition.
4.4 Reassembly
The assembly of the motor after overhaul is covered in sub-section 11.
5. ROTOR TEST AND REPAIR
5.1 Testing
All rotors shall be given a test for damaged bars, whether the motor is suspect in this area or not. This test shall apply a stable single-phase voltage to the stator of the assembled motor while the shaft is slowly turned through at least one revolution. Any fluctuations of stator current in excess of 3 percent shall be investigated further.
For motors where electrical or mechanical problems with the rotor are suspected, more sophisticated tests shall be used. These include one or more of the following:
• Growler tests;
• Current analysis or vibration analysis of a loaded motor;
• Physical examination;
• Ultrasonic examination of the bars and end rings;
5.2 Cast Rotor Repair
Since repair of squirrel cages can be expensive, no work shall be done in this area without purchaser approval. A defective cast cage shall not be repaired without prior authorization from the purchaser.
6. SHAFT REPAIR
6.1 General
If information on the Motor Repair Form or any tests indicate that there may be a shaft problem, it shall be tested and repaired or replaced. If there is any risk or uncertainty in the proposed repair method, this shall be discussed with the purchaser prior to proceeding.
6.2 Requirements
When the work is completed, the shaft shall meet the following criteria:
• Total Indicated Run out. It shall be straight, with a Total Indicated Run out (TIR) when measured in V blocks, of no more than 0.051 mm (0.002 inch) for up to 41.3 mm (1.625 inch) shaft diameter and no more than 0.003 inch for larger diameters.
• No Cracks. The shaft shall have no cracks. If ultrasonic, magnetic particle, dye penetrant or other testing methods are needed to verify this, they shall be documented in repair records.
• Straightness. The shaft shall be straight, parallel and undamaged at the bearing areas. If any measurable but acceptable deviation from this is noted, it shall be documented in repair records.
7. ANTI-FRICTION BEARINGS
7.1 New Bearings
Anti-friction bearings shall always be replaced. New bearings shall be the same type as originally used, unless otherwise approved by the purchaser. If the bearing type, size, sealing, shielding or configuration is changed, this shall be noted on a supplemental nameplate.
7.2 Clearance
Unless otherwise specified by the manufacturer or purchaser, C3 clearance bearings shall be used for all bearings.
7.3 Tolerances
Fitting tolerances to the journals and housings shall be per manufacturer’s specifications. Out of tolerance fits shall be restored. (Reference ANSI/ABMA Std. 7-1995 as a guide.)
7.4 Heating
The bearing shall be heated, without use of direct flame, to approximately 94°C (200°F) to permit it to be slid easily onto the shaft up to the shoulder. Bearings with bores under 45mm may be press fit.
7.5 Grease
Greasable bearings shall be lubricated as specified in the EASA Recommended Practice for the Repair of Rotating Electrical Apparatus. Lubrication shall be in accordance with the motor manufacturer’s recommendations if available. Otherwise fill the cavity to 1/3 capacity. The lubricant shall be compatible with both the customer’s lubricant and the lubricant packed by the bearing manufacturer.
8. END BRACKETS
8.1 Requirements
End brackets shall fit snugly to the stator frame. Worn dowel holes and rabbet fits shall be repaired.
8.2 Tolerances
See section 7.3 for the fit of the outer diameter of anti-friction bearings to housings.
8.3 Repairs
Repairs to end bracket bearing housings shall be by building up the metal and machining to size. Welding, plating and sleeving are the accepted methods. Epoxies and other compounds shall not be used for locking bearings.
9. OTHER DEVICES
9.1 Fans
Fans shall be checked for cracks and fit to the shaft or rotor.
Fans shall be firmly fixed to the shaft or rotor by the original factory method, unless there has been corrosion between dissimilar metals, in which case a new method shall be proposed to the purchaser. Welding to the shaft is not permitted.
New fans shall be as supplied by the original manufacturer if available.
Fans used in motors for use in hazardous locations shall be made of material that will not cause sparking, either by impact or by build up of static electricity.
9.2 Leads
Leads shall be flexible and multistranded, and have at least the same cross sectional area as the original leads. Temperature class must be the same as original or better.
Main power and accessory leads shall be indelibly marked using the same marking systems as the incoming motor. Every effort shall be made to keep the original direction of rotation.
Lugs, if used, shall be suited for the application and have all cable strands in the lug. If crimp lugs are used, the correct make and style of die shall be used for the particular lug, and the correct compression applied.
9.3 Terminal Boxes
Terminal boxes shall be returned to original condition. In particular, the following items must be confirmed.
• Missing bolts and gaskets for both the cover and the motor-to-box joint shall be replaced.
• On motors certified for hazardous environments, the junction boxes shall be sealed off from the main body of the motor by a sealing compound approved by UL for this application.
• Damaged flanges shall be repaired. No paint or gaskets shall be left on the flanges of boxes for explosion-proof motors.
9.4 Space Heaters
Space heaters shall be tested for insulation resistance for one minute at 500 volts. A 10 megohm minimum resistance is acceptable.
They shall be tested for correct functioning.
10. BALANCING
The motor rotor shall be dynamically balanced in a balance stand before assembly of the motor. Balance criteria include the following:
• Half key. It shall be balanced with a half key in the keyway.
• Tolerance G2.5 (ISO 1940-1). Generally, the
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Motor Overhaul Procedures
1. DOCUMENTATION
1.1 Repair Forms
The motor will be accompanied by a Motor Repair Form from the purchaser which will list the perceived problems, the operating environment, the urgency of the repair, past problems where applicable, the required repair, cost constraints, missing parts and the person within the purchaser’s organization to be contacted about the repair.
1.2 File
The repairer will keep a copy of the Motor Repair Form and the Repairer’s Tracking Form in the file for the particular job.
2. INCOMING INSPECTION
2.1 Visual
A visual inspection shall be made to assess the general condition of the outside of the motor for cracks, broken welds and missing parts.
2.2 Insulation to Ground
An insulation resistance test to ground shall be performed, at a voltage suitable for the motor’s voltage rating and the apparent condition of the motor.
• The initial test voltage shall be 500 volts DC.
• For motors where there is more than one winding, the insulation shall also be tested between windings, at the test voltage appropriate to the lower voltage winding, with other windings grounded.
• The duration of the insulation test shall be one minute.
2.3 Bearings
The shaft shall be manually rotated to check for any obvious problems with the bearings or shaft.
3. DISMANTLING
3.1 Identify Problem
After the incoming inspection, the motor shall be dismantled to the extent needed to either fully identify or repair the problem, or to do the specified overhaul.
3.2 Markings
วงเล็บท้ายและเฟรมจะชัดเจนตรงกับเครื่องหมายตัวเลขหรือตัวอักษร ส่วนกระเป๋า
3.3 สกรูและชิ้นส่วนขนาดเล็กจะถูกเก็บไว้ในภาชนะบรรจุที่ทุ่มเทและชิ้นส่วนจากงานอื่นๆ จะถูกเก็บไว้กับพวกเขา .
สำหรับ 3.4 หลักฐานการระเบิดมอเตอร์ได้รับการรับรองสถานที่อันตราย , การดูแลเป็นพิเศษจะต้องถ่ายเพื่อให้แน่ใจว่า ข้อต่อ และเปลวไฟ เส้นทางจะไม่ได้รับความเสียหายในระหว่างทำงานถ้าต้องซ่อมความเสียหายมากกว่าปกติพบว่า ผู้ซื้อจะต้องแจ้งก่อนที่จะดำเนินการซ่อมแซม เพื่อการกำจัด
3 ใบพัดแนวนอนมอเตอร์ที่เพลาใบพัดประกอบหนักเกินไปที่จะลบออกได้อย่างง่ายดายด้วยมือเดียวหรือสองรถเครนจะถูกใช้เพื่อย้ายเพลา กับปิดข้อต่อท่อติดตั้งผ่านปลายด้านหนึ่งของ ด้ามเป็นด้าม นามสกุล Attention shall be paid to the following:
• Care shall be taken that the slings do not damage the bearing surfaces or the rotor.
• Under no circumstances shall the stator windings be touched by any of the parts being
3.6 Bearing Removal
Used the puller to remove old baring out off shaft of rotor.
4. ROUTINE OVERHAULS
4.1 Testing
After dismantling, the following procedure shall be followed:
- ท่อที่คดเคี้ยว และเย็นจะสะอาดแห้งและตรวจสอบ
- ขดลวดความต้านทานฉนวนจะทดสอบที่ 500 โวลต์ DC .
- ระยะเวลาของการทดสอบจะเป็น 1 นาที ในระดับที่ยอมรับได้ หลังจาก 1 นาที แก้ไขที่ 40 °องศาเซลเซียสอุณหภูมิอ้างอิงต่อ IEEE 43 , 20 megohms . ระดับต่ำกว่า 20 megohms จะหารือกับผู้ซื้อ
• If satisfactory levels are not attained, the winding shall be recleaned and dried thoroughly at a temperature not exceeding 90°C (195°F), and then retested.
4.2 Cleaning
The components, including the stator windings, shall be cleaned with hot water and a suitable detergent after heavy deposits of dirt and grease have been removed by scraping and wiping.
If necessary,แปรงจะใช้ทำความสะอาดทางเดินขนาดเล็กในส่วนประกอบ ตัวทำละลายจะไม่สามารถใช้เพื่อทำความสะอาด ฉนวนกันความร้อน แต่อาจจะใช้ในชิ้นส่วนเครื่องจักรกลของมอเตอร์
ส่วนประกอบทั้งหมดจะสะอาดแห้งที่อุณหภูมิน้อยกว่า 90 ° C ( 195 ° F ) ตราบเท่าที่จะลบร่องรอยของความชื้น สำหรับ windingsนี้จะถูกระบุโดยฉนวนความต้านทานคงที่หลังจากชั่วโมงของการอบแห้ง
หลังจากซ่อมแซม 4.3 ความต้านทานของฉนวนที่น่าพอใจได้รับการบรรลุ ทั้งหมด หลวมหรือเสียหายเวดจ์ , ไม้เสียบ , ม้วนสนับสนุน ฯลฯ จะถูกแทนที่หรือซ่อมแซม .
ยกเครื่องงานประจำของส่วนอื่น ๆของมอเตอร์จะกลับส่วนสภาพดี 4.4 ครั้ง
สภานิติบัญญัติของมอเตอร์หลังยกเครื่องจะครอบคลุมในส่วนย่อย 11 .
5 ทดสอบใบพัดและซ่อมแซม
ทดสอบ 5.1
ใบพัดทั้งหมดจะต้องได้รับการทดสอบเพื่อทำลายบาร์ ว่ามอเตอร์เป็นผู้ต้องสงสัยในพื้นที่นี้หรือไม่ การทดสอบนี้จะใช้แรงดันไฟฟ้าขนาดมั่นคงกับสเตเตอร์ของมอเตอร์ในขณะประกอบเพลาจะค่อยๆเปลี่ยนผ่านการปฏิวัติอย่างน้อยหนึ่งคนมีความผันผวนของกระแสสเตเตอร์ในส่วนที่เกิน 3 เปอร์เซ็นต์ จะต้องสอบสวนเพิ่มเติม .
สำหรับมอเตอร์ที่ปัญหาไฟฟ้าหรือเครื่องกลกับใบพัดที่สงสัยว่าอาจจะมีการทดสอบที่ซับซ้อนมากขึ้น จะต้องใช้ เหล่านี้รวมถึงหนึ่งหรือมากกว่าต่อไปนี้ : การทดสอบช่องคลอด
-
- ; ปัจจุบันการวิเคราะห์หรือการวิเคราะห์การสั่นสะเทือนของโหลดมอเตอร์ ;
-
การตรวจร่างกาย ;• Ultrasonic examination of the bars and end rings;
5.2 Cast Rotor Repair
Since repair of squirrel cages can be expensive, no work shall be done in this area without purchaser approval. A defective cast cage shall not be repaired without prior authorization from the purchaser.
6. SHAFT REPAIR
6.1 General
ถ้าข้อมูลในการซ่อมมอเตอร์รูปแบบหรือการทดสอบใด ๆบ่งชี้ว่า อาจจะมีปัญหาที่เพลา มันจะถูกทดสอบและซ่อมแซมหรือเปลี่ยนใหม่ หากมีความเสี่ยงหรือความไม่แน่นอนในการเสนอซ่อมแซม วิธีนี้ จะหารือกับผู้ซื้อก่อนดำเนินการ .
6.2 ความต้องการ
เมื่องานจะเสร็จ เพลาจะตรงกับเกณฑ์ต่อไปนี้ :
( บวกรวมหมด
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