Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1988-01-25
1989-08-08
Shoop, Jr., William M.
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318803, 318811, 363 37, 388838, 388907, H02P 528
Patent
active
048556521
ABSTRACT:
AC power supply is converted to DC by a rectifier circuit. The DC is stepped up by a step-up chopper circuit. The output of the step-up chopper circuit is smoothed by a smoothing circuit. The output of the smoothing circuit is input to an inverter via a current detecting circuit and a voltage detecting circuit. A synchronous motor is connected to the inverter. When the speed of the synchronous motor is judged to be in a high speed region based on the output signal of the voltage detecting circuit, the first speed control apparatus operates the interrupting control of the switching element of the step-up chopper circuit in such a manner that a deviation speed between an instruction speed signal to the motor and the detected speed of the motor reaches to zero. When the duty ratio of the inverter reaches to 100%, that is, when the speed of the motor reaches to a low speed region, the first control speed apparatus controls the switching element of the step-up chopper circuit based on the output signal of the current detecting circuit, and the second control speed apparatus carries out the pulse width modulation control of the inverter in such a manner that a deviation speed signal between an speed instruction signal to the motor and the detected speed of the motor reaches to zero.
REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4545464 (1985-10-01), Nomura
patent: 4618810 (1986-10-01), Hagerman
patent: 4656571 (1987-04-01), Umezu
patent: 4767976 (1988-08-01), Mutoh
patent: 4788485 (1988-11-01), Kawagishi et al.
Endo Stunehiro
Iizuka Kenichi
Kashiwazaki Susumu
Miyashita Kunio
Yamashita Koujirou
Hitachi , Ltd.
Romano G. J.
Shoop Jr. William M.
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