Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-08-02
1998-09-22
Cabeca, John W.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318599, 318138, 323271, 323265, 388804, 363 41, G05B 1128, G05F 140
Patent
active
058119485
ABSTRACT:
An electric motor has first and second power feed terminals. A power feed line connects a dc power supply and the electric motor. A switching element provided in the power feed line includes a MOS-FET having a gate subjected to a pulse width modulation signal with a controllable duty cycle. The switching element changes between its on state and its off state in response to the pulse width modulation signal. The first power feed terminal of the electric motor is connected to the switching element. A flywheel diode connected in parallel with the electric motor operates to absorb a voltage which appears across the electric motor and returning a current when the switching element changes to its off state. A capacitor connected between the gate of the switching element and the second power feed terminal of the electric motor operates to suppress radio-frequency noise occurring upon every change of the switching element between its on state and its off state.
REFERENCES:
patent: 4258309 (1981-03-01), Oshaka et al.
patent: 4673851 (1987-06-01), Disser
patent: 4691149 (1987-09-01), Baumgartner et al.
patent: 4914540 (1990-04-01), Tabata et al.
patent: 5410229 (1995-04-01), Sebastian et al.
patent: 5448154 (1995-09-01), Kanke et al.
Sato Taketoshi
Takeuchi Shigeru
Yamada Masao
Cabeca John W.
Nippondenso Co. Ltd.
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