초록 ▼

A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals supplied to windings of the motor. This maximum

A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals supplied to windings of the motor. This maximum PWM on-time thereby limits motor torque output to a predetermined maximum. Stopping the motor is performed in sequential phases including a loaded generator phase, an active braking phase and a holding phase. During holding, the amount of energy supplied to the motor is reduced to the point just before slippage such that holding energy is minimized. Upon power failure, the motor is driven toward a spring return home position overcoming static friction that may prevent the spring return mechanism from functioning properly. These techniques are applied to a motor in an actuator.

대표청구항 ▼

[ What is claimed is:] [1.] A method for stopping rotation of a brushless DC motor, said method comprising:(a) operating said motor as a loaded generator;(b) during said operating (a), monitoring a motion profile of said motor;(c) when said motion profile of said motor reaches a predetermined charac

[ What is claimed is:] [1.] A method for stopping rotation of a brushless DC motor, said method comprising:(a) operating said motor as a loaded generator;(b) during said operating (a), monitoring a motion profile of said motor;(c) when said motion profile of said motor reaches a predetermined characteristic, engaging an active deceleration mode, wherein said active deceleration mode includes operating said motor to actively decelerate said motor by driving said motor in a direction opposite of rotation thereof; and(d) upon detection of reversal of direction of said motor, engaging a holding mode to hold said motor position static.