Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-12-16
1996-11-19
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318798, 318815, 318138, 318254, 318439, H02P 534
Patent
active
055766064
ABSTRACT:
An asynchronous motor is supplied with power from an AC line voltage via a variable speed drive including a rectifier bridge connected to the AC line voltage, a DC voltage intermediate circuit including a capacitor, and an inverter including switches controlled by a control circuit and connected to the phase windings of the motor. A cascade regulation structure includes a frequency regulator, a current limiter and a current regulator driving the control circuit. The frequency regulator input is connected to a ramp generator supplying the motor start speed and the frequency regulator output is connected to the current limiter. The output of the current limiter is connected to the current regulator. The cascade regulation structure is associated with the intermediate circuit to limit the DC voltage at the capacitor by means of the current limiter.
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Conrath Christian
Nguyen Phuoc Vinh T.
Masih Karen
Schneider Electric SA
Shoop Jr. William M.
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