Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1996-07-02
1998-07-21
Wysocki, Jonathan
Electricity: motive power systems
Switched reluctance motor commutation control
318701, H02P 700
Patent
active
057839166
ABSTRACT:
An apparatus and method for generating electrical signals which are representative of the rotational position of a rotor relative to a stator and for controlling commutation in a variable reluctance electric motor includes a circuit for generating relatively small pulses of electrical current to a non-energized stator winding of the motor. As the rotor rotates relative to the stator, the inductance induced in such stator winding will vary. As a result, the magnitude of the current pulses in the stator winding will increase over time. When the magnitude of such current pulses exceeds a predetermined threshold level corresponding to a predetermined relative rotational position of the rotor, a signal is generated to cause commutation of the motor. Variations in the inductances of the stator windings are compensated for by providing maximum and minimum voltage detector and hold circuits which are responsive to the output signals from the sample and hold circuit. By generating the threshold level as a function of the maximum and minimum signals, such as by a resistive voltage divider network, compensation is made for these variations in inductance. The above functions can be accomplished by a simple and inexpensive logic circuit.
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Dana Corporation
Wysocki Jonathan
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