Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1999-06-01
2000-11-21
Ip, Paul
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318696, 318686, G05B 1940
Patent
active
06150789&
ABSTRACT:
In a preferred embodiment, a stepper motor control, including: a driver to drive the stepper rotor; a detector to detect a commanded step rate signal provided to the driver and to provide an output signal proportional thereto; a power control, responsive to the output signal, to provide driving power to the driver, and to increase voltage to the driver in proportion to an increase in magnitude of the output signal; and an over-current protection circuit that becomes active above a predetermined motor current level and above a predetermined commanded step rate. Voltage control can be effected either on the drive board or by controlling the power supply. An additional feature provides over-current protection for the stepper motor during a lock rotor (stall) condition. The stepper motor control produces very low levels of EMI/RFI as compared with PWM current control (chopper) drives.
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Crozier John H.
Ip Paul
Tri-tech, Inc.
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