초록 ▼

A control circuit for a brushless DC motor providing positive control in all four quadrants of motor operation. The circuit provides control of motor current, thereby controlling motor torque, in response to an applied current command signal, relying solely on feedback signals of motor current and r

A control circuit for a brushless DC motor providing positive control in all four quadrants of motor operation. The circuit provides control of motor current, thereby controlling motor torque, in response to an applied current command signal, relying solely on feedback signals of motor current and rotor angle. The heart of the system is a level dependent logic stage which selectively controls the states of the switches applying power to the motor windings in accordance with a current error signal developed by reference to the feedback current signal. The control circuit causes the motor current to correspond to any applied current command and works at any motor speed and torque for rotation in either direction. In a preferred embodiment, the basic control system is combined with additional feedback loops developing servo information regarding rate and actuator position to provide a overall position control system, such as is particularly useful in place of the hydraulic actuator systems now employed in aircraft.

대표청구항 ▼

Apparatus for controlling the current and torque of a brushless DC motor comprising: a brushless DC motor having a plurality of windings; a plurality of solid state power switches respectively connected to said windings for selectively applying power to develop current therein; means for determining

Apparatus for controlling the current and torque of a brushless DC motor comprising: a brushless DC motor having a plurality of windings; a plurality of solid state power switches respectively connected to said windings for selectively applying power to develop current therein; means for determining the states and order of switching between states of said solid state switches in response to a current error signal; means for deriving a current feedback signal indicative of current in the motor windings; and means for combining the current feedback signal with an applied current command signal to develop the error signal.