Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1990-09-20
1992-03-24
Shoop, Jr., William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 310156, H02P 516
Patent
active
050991825
ABSTRACT:
A liquid fogging apparatus has a motor which operates from the 12 volt power supply of a vehicle and delivers high torque at high speed, operating aproximately at 0.2 horsepower at 28,000 RPM. A rotating ring of porous ceramic material atomizes the liquid. The motor is small, 1.6" in diameter with a 5/8" diameter rotor. The stator has four phases each preferably containing eight three-turn windings of four strand wire, wound in slots in the outer surface of a short laminated stack, which is reinforced in epoxy with its inner surface honed to minimum thickness to reduce flux leakage. Eight bipolar permanent magnets are set in axial slots of a rotor stack with like poles facing tangentially toward each other around the rotor shaft. A controller commutates the motor sensing back-EMF on the windings to control speed and detect motion during start-up. Start-up is accomplished with a fixed frequency external oscillator which sequentially energizes the coils, followed by DC commutation until the motor accelerates, then pulse-width control of operating speed. The motor drops to an idle speed when the load is removed. An inhibit signal disables the fogger pump if motor speed is too low.
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patent: 4238717 (1980-12-01), Knight et al.
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patent: 4804892 (1989-02-01), Muller
patent: 4918346 (1990-04-01), Tajima et al.
patent: 5012166 (1991-04-01), Ushijima et al.
Isaacson Milton S.
Kinsworthy Donald D.
Mubaslat Saed M.
Martin David
Nu-Tech Industries, Inc.
Shoop Jr. William M.
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