Method and apparatus for extending the torque range of a...

Details Method and apparatus for extending the torque range of a... Method and apparatus for extending the torque range of a...

2005-09-27

2005-09-27

Masih, Karen (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S432000, C318S433000

Reexamination Certificate

active

06949907

ABSTRACT:
An apparatus including a stepper motor for actuating a moveable element of the apparatus. The maximum torque that can be generated at each step is a function of the voltage supplied to the motor. In some applications, however, torque greater than the nominal maximum may be required for brief periods. Under such conditions, the need for greater torque is sensed and a controller supplies a higher voltage to the motor, thereby increasing temporarily the output torque. When increased torque is no longer required, the voltage is reduced to nominal. The invention is useful, for example, for extending the range of a stepper motor actuator for an intake air control valve in a fuel cell assembly.

REFERENCES:
patent: 3731564 (1973-05-01), Diener et al.
patent: 5996553 (1999-12-01), Sanvido et al.
patent: 6062063 (2000-05-01), Robson
patent: 6267559 (2001-07-01), Mossman et al.
patent: 6642636 (2003-11-01), Enzinna
patent: 2003/0143445 (2003-07-01), Daniel et al.

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