Sensorless vector control (SLVC)

The sensorless (field-oriented) vector control for asynchronous motors is based on a decoupled control for the torque-producing and the field-producing current component. In addition, the actual speed is reconstructed by means of a motor model so that a speed sensor is not required.

Preconditions

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Sensorless vector control (SLVC) is only suitable for asynchronous motors.

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Multi-motor operation is not permitted for sensorless vector control (SLVC).

Supported operating modes 0x6060 (P301.00):

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"MS: Velocity mode [-2]"

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"MS: Torque mode [-1]"

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"CiA: Velocity mode (vl) [2]"

Details

Compared to the V/f characteristics, the sensorless vector control (SLVC) serves to achieve improved drive characteristics thanks to:

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higher torque throughout the entire speed range

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higher speed accuracy and smooth running properties

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higher efficiency


①	Sensorless vector control (SLVC)
②	V/f characteristic control for asynchronous motor (VFC open loop)