Motor control device motor control device including a gate eleme

Details Motor control device motor control device including a gate eleme Motor control device motor control device including a gate eleme

1993-11-10

1995-07-11

Wysocki, Jonathan

Electricity: motive power systems

Open-loop stepping motor control systems

318432, H02P 800

Patent

active

054324246

ABSTRACT:
A motor control device capable of obtaining necessary and sufficient torque produced by a motor irrespective of the rotation speed of the motor and capable of preventing overcurrent from being applied to the motor. Pulses having a predetermined pulse width are generated in the period inversely proportional to the number of revolutions of the motor. A current control signal is made effective in a time period during which the pulses are generated, while being made ineffective to use a predetermined reference signal instead in the remaining time period. The current control signal corresponds to current to be supplied to the motor so as to obtain the necessary torque. The predetermined reference signal corresponds to current less than the current corresponding to the current control signal. The ratio of a time period during which the current control signal is made effective is increased at the time of rotation at high speed, while the ratio of a time period during which the reference signal is used is increased at the time of rotation at low speed. Therefore, sufficient current to obtain the necessary torque is supplied to the motor at the time of rotation at high speed. On the other hand, the overcurrent can be prevented from being applied to the motor at the time of rotation at low speed.

REFERENCES:
patent: 4051418 (1977-09-01), O'Berto et al.
patent: 4227138 (1980-10-01), Espelage et al.
patent: 4336484 (1982-06-01), Marinko
patent: 4757246 (1988-07-01), Komuro
patent: 5057760 (1991-10-01), Dadpey et al.
patent: 5194796 (1993-03-01), Domeki et al.
patent: 5335307 (1994-08-01), Summer

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