Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1989-10-19
1991-07-02
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318254, 318430, 318438, H02P 146
Patent
active
050292633
ABSTRACT:
The problem of providing aircraft engine starting is solved with an engine start control apparatus operating a generator (12) as a synchronous motor. The motor (12) receives power from a main inverter (46) and an excitation inverter (48) through an exciter (14) operating as a rotary transformer. These inverters (46, 48) are controlled by a control unit (22) which provides for constant power characteristics in the field weakening range. The control unit (22) includes a pulse width modulation (PWM) generator (100) which is responsive to a voltage command (102) and a commutation command (104) to develop switching signals (88) for controlling the switches (S1-S6) in the main inverter (46). The voltage command (102) is used to vary the duty cycle of the PWM signals. The commutation angle command (104) is used to control the timing of the PWM signals. The voltage command (102) and the commutation angle command (104) are controlled using closed loop current control.
REFERENCES:
patent: 4085355 (1978-04-01), Fradella
patent: 4125796 (1978-11-01), Nagase et al.
patent: 4172991 (1979-10-01), Akamatsu et al.
patent: 4223261 (1980-09-01), White
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4295085 (1981-10-01), Lafuze
patent: 4320331 (1982-03-01), Plunkett
patent: 4364004 (1982-12-01), Bourbeau
patent: 4418308 (1983-11-01), Bose
patent: 4427934 (1984-01-01), Tupper
patent: 4546293 (1985-10-01), Peterson et al.
patent: 4608527 (1986-08-01), Glennon et al.
patent: 4651068 (1987-03-01), Meshkat-Razavi
SAE Technical Paper Series No. 871887, D. E. Baker (Oct. 5-8, 1987).
Ro Bentsu
Sundstrand Corporation
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