Abstract
An open velocity loop current regulated sensorless control scheme for both induction and permanent magnetic motor drives with an output sine wave filter and transformer is designed and implemented in this paper. The proposed control scheme provides a low-voltage drive solution for driving medium-voltage motors without substantially oversizing the inverter. Sufficient starting torque is guaranteed with controlled drive and motor current. Laboratory proof-of-concept tests and experimental results on an actual deep well have validated the effectiveness of the proposed control scheme
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