Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1996-12-10
1998-10-20
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, H02P 705
Patent
active
058251537
ABSTRACT:
A current measuring apparatus measures current flowing through a phase winding of a switched reluctance motor while dissipating very little power. The apparatus includes a control for controlling the current flowing through the winding. A gate is operatively connected to the control for switching the current flowing through the winding. The arrangement is such that in a first mode of the gate, the current flows through the phase winding. In a second mode of the gate, flow of the current through the winding is inhibited. The gate includes a sense means for sensing a fraction of the current when the gate is in the first mode thereof. A resistor of relatively high resistance is electrically connected in series with the sense means such that a voltage drop occurs across the resistor when the gate is in the first mode. The voltage drop signal is fed back to the control so that dependent on the signal, the current flowing through the phase winding of the motor is maintained in order to maximize motor efficiency.
REFERENCES:
patent: 4654568 (1987-03-01), Mansmann
patent: 5032774 (1991-07-01), Juzswik
patent: 5245523 (1993-09-01), Juzswik
patent: 5559375 (1996-09-01), Jo et al.
patent: 5585701 (1996-12-01), Kaida et al.
Ro Bentsu
United Technologies Automotive Inc.
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