Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-09-13
1990-10-23
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318808, 318727, 318811, 363 41, 363 37, 361 23, H02P 742
Patent
active
049655043
ABSTRACT:
A control apparatus for controlling a PWM inverter, the PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, comprises a circuit for generating, on the basis of a given running command, a PWM signal controlling the inverter with a given sampling period, and a circuit for controlling the PWM signal generating circuit, whereby the AC motor generates an electromagnetic tone preselected so as to correspond to desired information when the AC motor is driven by output of the inverter controlled by the PWM signal. The above described desired information may be information representing the running state of the motor or selected music.
REFERENCES:
patent: 4467260 (1984-08-01), Mallick, Jr. et al.
patent: 4470092 (1984-09-01), Lombardi
patent: 4532464 (1985-07-01), Igarashi et al.
patent: 4629959 (1986-12-01), Okuyama et al.
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4862343 (1989-08-01), Nomura et al.
1986 National Conventional Record, IEE of Japan Nos. 535, 536, pp. 625-626.
1988 National Convention Record, IEE of Japan, No. 523, pp. 619-620.
1988 National Convention Record, Industry Application IEE of Japan, No. 74, pp. 339-342.
Honda Kazuo
Ikimi Takashi
Matsuda Toshihiko
Mutoh Nobuyoshi
Nagase Hiroshi
Hitachi , Ltd.
Ip Paul
Shoop Jr. William M.
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