Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1987-09-25
1988-07-19
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
H02K 2908
Patent
active
047587687
ABSTRACT:
A 12-step commutation in a brushless DC motor is achieved by six shaft-mounted commutation sensors and circuitry which permits inexpensive shaft-angle decoding for coil excitation. The commutation signal devices are Hall sensors arranged in two sets. A first set is arranged to produce the desired switching signals every 120 electrical degrees; a second set of three Hall sensors is similarly arranged equally spaced between the electrical switch points of the first set, however, the second set of sensors is wired together through the process of EXCLUSIVE-ORing to form a single, fourth output. Thus, the six Hall sensors are configured to produce four output signals which may be inexpensively decoded using a standard 32.times.8 PROM. A further refinement includes current modulation to the field coils in order to equalize the torque output of alternate steps. In one embodiment, this is accomplished by reducing the gain of the motor's servo amplifier so that the desired current shift is achieved by changes in the motor's load impedance.
REFERENCES:
patent: 4283664 (1981-08-01), Ebert
patent: 4353016 (1982-10-01), Born
patent: 4355255 (1982-10-01), Herr et al.
patent: 4494053 (1985-01-01), Gotou
Green Richard C.
Hendricks Howard F.
Gore Gregory J.
Penn Engineering & Manufacturing Corp.
Ro Bentsu
LandOfFree
12-step commutation device for an electric motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with 12-step commutation device for an electric motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 12-step commutation device for an electric motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-599085