| 摘要 |
An induction motor supplied with AC current from a 3Φ inverter converting power from a DC source. three static Sws Q1, Q2, Q3 are associated with the positive polarity and Q4, Q5, Q6 with the opposite polarity, which are controlled in such a way that only rated motor current is supplied, while allowing the motor to start and maintain a const. torque over a wide speed range. A coil(1) is mounted on the stator in such a way that it forms a loop stretching over the width of one pole for 36 slots of a four-pole machine, coil(1) covers 9 slots. The air gap voltage sensed by coil(1) is applied via line(2) to an integrator(3) and the integrated signal which is representative of the flux is rectified by cct. (5) so that a unidirectional signal representing the motor flux is generated on line (6).
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