Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1994-09-30
1996-11-05
Martin, David S.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 388813, 388815, 388911, 330118, H02K 1732
Patent
active
055720994
ABSTRACT:
A phase-locked loop (or frequency-locked loop) based circuit for controlling the drive applied to a DC polyphase motor is disclosed. The disclosed circuit includes a clamp circuit, connected to the input of the motor drive amplifier, for limiting the current applied to the drive amplifier, in order to ensure that the power supply is not overloaded. According to one embodiment of the invention, the clamp circuit includes a buffer amplifier having a source leg and a sink leg. During a current control mode, both the source leg and sink leg of the buffer amplifier are enabled to drive the input of the motor drive amplifier; the buffer amplifier is a differential amplifier and applies a feedback signal from the drive amplifier input to control the current applied thereto according to an input limit signal. In a speed control mode, a PLL/FLL circuit controls the drive to the motor drive amplifier, and the source leg of the buffer amplifier is disabled; the sink leg remains enabled, however, so that the current continues to be limited in the speed control mode. According to another embodiment of the invention, a series switch is used to switch the input of the drive amplifier from the buffer amplifier to the PLL/FLL circuit upon switching from current control mode to speed control mode.
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Anderson Rodney M.
Galanthay Theodore E.
Groover Robert
Martin David S.
SGS-Thomson Microelectronics Inc.
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