Method and apparatus for automatically controlling and scaling m

Details Method and apparatus for automatically controlling and scaling m Method and apparatus for automatically controlling and scaling m

1995-09-15

1998-04-28

Masih, Karen

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Field control, or field and armature control

388937, 31856811, 31856818, 318628, 318624, 901 9, H02P 718

Patent

active

057456470

ABSTRACT:
A method and apparatus automatically associate a sensed mechanical parameter to a range of motor velocity for controlling the rotational velocity of a motor driving a medical instrument. The method and apparatus sense or measure the mechanical parameter whose value, controlled by a human operator, through for example, a footpad, can be measured and converted to a digital signal. The method and apparatus, in response to the measured sensed mechanical parameter, automatically scale the range of parameter values to a new range of motor velocity values thereby adjusting, to the mechanical displacement (force or distance) with which the user is most comfortable. The transformation also provides deadband values around the minimum and maximum motor velocities so that maximum motor velocity is not "chased" and minimum motor velocity is not sensitive to small perturbations due to thermal effects and other events which may affect the mechanical sensor output.

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