Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1979-08-31
1981-07-14
Witkowski, S. J.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02P 602
Patent
active
042789214
ABSTRACT:
A constant speed brushless D.C. motor of the permanent magnet outside rotor type with an internal stator wired in quadrature having a pair of Hall effect switches one of each mounted in proximity to one of a pair of opposite stator wirings to sense the direction and phrase relationship of the field in the rotor, a coarse feedback loop sensing back electromotive force in said motor including first comparator for comparing the negative generated motor voltage and motor potential said Hall effect switches operating under the influence of said first comparator to control power to said motor and thereby control its speed, a fine speed control loop including a tachometer for generating electrical pulses in proportion to motor speed upon rotation of said rotor, counter means counting said pulses and a second comparator connected to said counter means for comparing the frequency of said electrical pulses having a given frequency and the electrical pulses representing a steady desired preset motor speed providing a balancing potential difference at said second comparator thereby achieving a frequency lock to lock in the motor speed. An electrical dynamic brake is disclosed.
REFERENCES:
patent: 3896357 (1975-07-01), Tanikoshi
patent: 3979651 (1976-09-01), Bringol
patent: 4023082 (1977-05-01), Tanikoshi
patent: 4039911 (1977-08-01), Tanikoshi
patent: 4085577 (1978-04-01), Natori
patent: 4119859 (1978-10-01), Muller
patent: 4127799 (1978-11-01), Nakamura et al.
Kay Peter D.
Medding Reuben
Consolidated Electronic Industries Proprietary Limited
Redman John W.
Witkowski S. J.
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