Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1994-09-30
1997-08-12
Masih, Karen
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 318771, H02K 2300
Patent
active
056568975
ABSTRACT:
A motor drive system, and method for operating the same, which includes current mirror load current sensing, is disclosed. Sensed current is used in the well known manner to control the low side drive of the motor. The disclosed motor system operates in a bipolar mode on startup, and in a unipolar mode during full speed operation. In unipolar mode, a current mirror transistor is provided to sense the load current through the center tap drive transistor in a continuous manner. Ripple in the sensed current is avoided, as the center tap drive transistor is not commutated during motor operation in unipolar mode. In bipolar mode, current mirrors are provided for both of the high side and low side drive transistors in each leg, with the currents summed for each coil at a sum node, and with the summed current applied to a cumulative sum node; the summed current never drops to zero, as only one drive transistor changes in each phase change in the commutation sequence.
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Carobolante Francesco
Lu Li-Hsin D.
Schlager Karl
Galanthay Theodore E.
Jorgenson Lisa K.
Masih Karen
SGS-Thomson Microelectronics Inc.
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