A Brushless DC Motor having difficulty operating could indicate that the Hall Sensors are bad. To check, use a resistor to pull up each Hall to 5 volts, and check each Hall with an oscilloscope while spinning the shaft. Monitor the point between the Hall and the resistor as pictured below in Figure 2.
Repeat this process for each individual Hall. When spinning the shaft manually, a low and high signal should appear on the scope. Keep in mind the importance of what value is used for the resistance; this depends on the amount of current the Hall sensors can withstand.
If this test demonstrates that the Hall Sensors are working correctly, the next step is to check the phases of the Brushless DC Motor. Hook up the Brushless DC Motor to a controller. With an oscilloscope, check each phase to see if a switching signal is present. If the phases do not pose a problem, this may indicate a bearing problem, or internal shorts. If these techniques do not seem to explain why the Brushless DC Motor is working improperly, the purchase of a new Brushless DC Motor should be considered. - See more at: http://www.anaheimautomation.com/manuals/forms/brushless-dc-motor-guide.php#sthash.wu3GqqF9.CbYTs9N2.dpuf
A Brushless DC Motor having difficulty operating could indicate that the Hall Sensors are bad. To check, use a resistor to pull up each Hall to 5 volts, and check each Hall with an oscilloscope while spinning the shaft. Monitor the point between the Hall and the resistor as pictured below in Figure 2. Repeat this process for each individual Hall. When spinning the shaft manually, a low and high signal should appear on the scope. Keep in mind the importance of what value is used for the resistance; this depends on the amount of current the Hall sensors can withstand. If this test demonstrates that the Hall Sensors are working correctly, the next step is to check the phases of the Brushless DC Motor. Hook up the Brushless DC Motor to a controller. With an oscilloscope, check each phase to see if a switching signal is present. If the phases do not pose a problem, this may indicate a bearing problem, or internal shorts. If these techniques do not seem to explain why the Brushless DC Motor is working improperly, the purchase of a new Brushless DC Motor should be considered. - See more at: http://www.anaheimautomation.com/manuals/forms/brushless-dc-motor-guide.php#sthash.wu3GqqF9.CbYTs9N2.dpuf
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