Device for driving electric motors

Details Device for driving electric motors Device for driving electric motors

2005-01-25

2005-01-25

Martin, David (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S434000, C318S811000, C318S812000, C388S811000

Reexamination Certificate

active

06847182

ABSTRACT:
A device for driving electric motors includes a power stage with a variable duty-cycle coupled to a supply voltage. The power stage is suitable for driving an electric motor. The driving device includes a circuit that is capable of raising the value of the input voltage of the power stage above the induced counter electromotive voltage of the motor in certain periods of time and a control device capable of activating the circuit in reply to values of the induced counter electromotive voltage being greater than or comparable with the supply voltage.

REFERENCES:
patent: 4893067 (1990-01-01), Bhagwat et al.
patent: RE35124 (1995-12-01), Erdman et al.
patent: 5780986 (1998-07-01), Shelton et al.
patent: 5886484 (1999-03-01), Fucili et al.
patent: 5953491 (1999-09-01), Sears et al.
patent: 6384556 (2002-05-01), Mizumoto et al.
patent: 6402260 (2002-06-01), Kobayashi et al.

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