Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1996-07-26
1998-03-17
Ip, Paul
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318685, 318138, 318254, 318696, H02K 2902
Patent
active
057291128
ABSTRACT:
A phase current sensing apparatus is disclosed for use in a bifilar-wound switched reluctance motor drive topology. The phase winding includes a primary coil, and a secondary coil. A power switch is connected in-series with the primary coil, and a common node, which common node is further connected to ground by way of a resistive shunt. The other end of the primary coil is tied to a positive bus of a power supply. The secondary coil, which is oppositely wound relative to the primary coil, has one end tied to the positive bus, and the other end tied to a cathode terminal of a diode. An anode terminal of the diode is tied to the common node. A non-inverting amplifier, and an inverting amplifier are provided and each is responsive to the voltage developed on the common node. The non-inverting amplifier generates a first signal S.sub.1 that is indicative of a primary coil current. The inverting amplifier generates a second signal S.sub.2 that is indicative of a secondary coil current. Each of the first, and second signals S.sub.1, and S.sub.2 are of a positive-polarity. An analog switch is provided, and is controlled by a phase commutation signal that controls the energizing switch, to select one of S.sub.1 and S.sub.2. The output of the analog switch is continuous, and of positive-polarity.
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Dana Corporation
Ip Paul
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