Motor system with reduced common-mode noise

Details Motor system with reduced common-mode noise Motor system with reduced common-mode noise

2011-01-11

2011-01-11

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S700000, C363S039000

Reexamination Certificate

active

07868571

ABSTRACT:
A motor system with reduced common-mode noise includes an AC power, a first transformer unit electrically connected to the AC power and providing a first DC power, and a second transformer unit electrically connected to the AC power and providing a second DC power. The first DC power is supplied to a motor driving section of the motor system, and the second DC power is supplied to a motor controlling section of the motor system. Therefore, a common-mode noise from the transformer winding for the motor driving section can be prevented from coupling to the transformer winding for the motor controlling section. Moreover, a safe stop signal is applied to turn down a PWM IC for power through a photo coupler or a relay. Therefore, the first transformer unit stops supplying current to the motor driving section of the motor system to enhance safe stop function for the motor system.

REFERENCES:
patent: 5731681 (1998-03-01), Inaniwa et al.
patent: 6046553 (2000-04-01), Matsunaga et al.
patent: 6160455 (2000-12-01), French et al.
patent: 2002/0063474 (2002-05-01), Wasaki et al.
patent: 2002/0075702 (2002-06-01), Igarashi et al.
patent: 2004/0000947 (2004-01-01), Luu
patent: 2009/0195303 (2009-08-01), Bowhers

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