Electric machine controller

Details Electric machine controller Electric machine controller

1995-07-11

1998-04-07

Masih, Karen

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

318254, 318138, 318439, H02P 146

Patent

active

057368287

ABSTRACT:
A controller for a switched electric machine, especially a switched reluctance motor, takes timing information from a rotor position transducer to generate a switch-off output at a point near maximum phase inductance in a phase inductance cycle. A switch-on signal is generated after a delay but still within the phase inductance cycle. A simple form of single-pulse control is thereby achieved. A comparator is also provided which monitors phase winding current. A pulse generator is actuated by the comparator when the winding current exceeds a reference level and is used to control the motor in a chopping mode at low speeds and is disabled by the comparator at higher speeds when the single-pulse control is used.

REFERENCES:
patent: 3743906 (1973-07-01), Torok
patent: 4172232 (1979-10-01), Joyes
patent: 4172233 (1979-10-01), Joyes
patent: 4707650 (1987-11-01), Bose
patent: 4933621 (1990-06-01), MacMinn et al.
patent: 5163170 (1992-11-01), Grabowski
patent: 5180960 (1993-01-01), Austermann

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