Servo control for asynchronous motor (SC-ASM)

The field-oriented servo control is based on a separated control of the torque-producing and field-producing current components. The motor control is based on a feedback, field-oriented and cascaded controller structure and enables a dynamic and stable operation in all four quadrants.

Preconditions

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The servo control (SC ASM) is only suitable for asynchronous motors.

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The servo control (SC-ASM) requires a feedback of the speed. A HTL encoder must be connected to the inverter and set as feedback system for the motor control.

Details

Fundamentally, the servo control has the same advantages as the sensorless vector control (SLVC). Compared to the V/f characteristic control without feedback, the following can be achieved by means of the servo control:

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A higher maximum torque throughout the entire speed range

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A higher speed accuracy

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A higher concentricity factor

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A higher level of efficiency

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The implementation of torque-actuated operation with speed limitation

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The limitation of the maximum torque in motor and generator mode for speed-actuated operation