Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1988-11-23
1989-12-19
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, H02K 2908
Patent
active
048885304
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to electric motors and, in particular, to two-phase gate motors.
PRIOR ART
Known in that art is a two-phase gate motor comprising a stator equipped with power coils, rotor position magnetiosensitive pickups disposed in the immediate vicinity of the power windings, and transistors whose bases are connected to outputs of the rotor position magnetosensitive pickups and whose collectors are connected to first leads of the power windings while second leads thereof are electrically connected to a common line (USA, 3 767 986).
In this motor the output signal of the magneto-sensitive element of each rotor position pickup is amplified by a transistor. This is a disadvantage because the transfer ratio of the signal from the magneto-sensitive element of the rotor position pickup to the power winding cannot be made sufficiently stable.
This transfer ratio of a signal from the magneto-sensitive element of the rotor position pickup to the power winding is adequately stable in the known two-phase gate motor (DE, A, 2 601 981) comprising a stator with power windings having different phases, magneto-sensitive rotor position pickups arranged very close to the power windings, a rotor made as a permanent magnet having poles on the active surface facing the power windings and the magneto-sensitive rotor position pickup, and first and second operational amplifiers having inverting and non-inverting inputs connected to outputs of the magneto-sensitive pickups and also having outputs connected to first leads of the power windings whose second leads are electrically connected to a common bus (DE, A, 2 601 981).
However, this prior art gate motor is deficient in that electromagnetic disturbances are produced in each magneto-sensitive rotor position pickup by the power winding of the other phase. This, in turn, results in variations in the motor torque.
DISCLOSURE OF THE INVENTION
This invention is to provide a two-phase gate motor featuring a means interconnecting the power windings with different phases, which could compensate electromagnetic interference produced in the magneto-sensitive rotor position pickup by the power winding of the adjoining phase and in this manner to reduce variations in the motor torque.
This is achieved in that in a two-phase gate motor comprising a stator with power windings having different phases, magneto-sensitive rotor position pickups arranged very close to power windings, a rotor made as a permanent magnet whose poles are disposed on the active surface facing the power windings and magneto-sensitive rotor position pickups, and first and second operational amplifiers having inverting and non-inverting inputs connected to outputs of the magneto-sensitive pickups and also having outputs connected to first leads of the power windings whose second leads are electrically connected to common bus, according to the invention, each first and second operational amplifier is provided with a means for compensation of electromagnetic interferences from the power winding of the adjoining phase, which are produced in the magneto-sensitive rotor position pickup, said means being electrically connected to one of the inputs of the first and second operational amplifiers and to an output of said first and second operational amplifiers.
Desirably, the means for compensation of electromagnetic interferences from the power winding of the adjoining phase, produced in the magneto-sensitive rotor position pickup, provided for each first and second operational amplifiers should comprise a main resistor whose first output is connected to the inverting input of the first operational amplifier and to the non-inverting input of the second operational amplifier, while a second output thereof is electrically connected to the output of the second operational amplifier for the first operational amplifier and to the output of the first operational amplifier for the second operational amplifier.
It is also desirable that the second lead of the main resistor should be directly connected to
REFERENCES:
patent: 3767986 (1973-10-01), Wada
patent: 3891904 (1975-06-01), Pollmeier
patent: 4028598 (1977-06-01), Bergmans
patent: 4230976 (1980-10-01), Muller
patent: 4459520 (1984-07-01), Wada
patent: 4460856 (1984-07-01), Mizumoto
patent: 4724365 (1988-02-01), Muller
Korsen Vilie K.
Pungas Toom A.
Radik Tynu A.
Sjugis Anatol J.
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