Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1990-06-18
1991-12-10
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02P 800
Patent
active
050721666
ABSTRACT:
Rotor position information for a switched reluctance (SR) motor drive is obtained indirectly in response to the motor phase inductance. An oscillator generates a signal having a time period that is a function of the inductance. The signal is processed by other circuits to obtain proper instants of commutation. In the preferred motor drive, the energized phase windings are isolated from the oscillator, and periodic signals are obtained which have periods indicating the phase inductances of the unenergized phase windings. The periods are compared to threshold values to obtain position indicating signals, and commutating signals are derived from the position indicating signals.
REFERENCES:
patent: 4611157 (1986-09-01), Miller
patent: 4772839 (1988-09-01), MacMinn
patent: 4777419 (1988-10-01), Obradovic
patent: 4868478 (1989-09-01), Hedlund et al.
patent: 4959596 (1990-09-01), MacMinn et al.
MacMinn et al., "Application of Sensor Integration Techniques to Switched Reluctance Motor Drives," IEEE Industry Applications Conference Record 1988, pp. 584-588 (1988).
Bergmann Saul M.
Shoop Jr. William M.
The Texas A&M University System
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