In order to control the speed of a dc series field motor
at different required torque levels, it is necessary to adjust the voltage
applied to the motor. For any particular constant voltage the
motor speed is determined solely by the torque requirements and
top speed is reached under minimum torque conditions. When a
series motor is used as a traction drive for vehicles, it is desirable
to control the voltage to the motor to fit the various torque requirements
of grades, speed, and load. The common method of varying
the speed of the motor is by inserting resistance in series with motor
to reduce the supplied power. This type of motor speed control is
very inefficient and wasteful of battery power due to the 12R loss,
especially under high current, high torque conditions.
In order to control the speed of a dc series field motorat different required torque levels, it is necessary to adjust the voltageapplied to the motor. For any particular constant voltage themotor speed is determined solely by the torque requirements andtop speed is reached under minimum torque conditions. When aseries motor is used as a traction drive for vehicles, it is desirableto control the voltage to the motor to fit the various torque requirementsof grades, speed, and load. The common method of varyingthe speed of the motor is by inserting resistance in series with motorto reduce the supplied power. This type of motor speed control isvery inefficient and wasteful of battery power due to the 12R loss,especially under high current, high torque conditions.
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