BRAKING OF ELECTRIC MOTORS

摘要

Apparatus for controlling braking of a reversible electrical motor 4 comprises a first detector 11 for detecting the position of a reversing switch 10, which indicates a selected direction of motion of the motor 4. The detector 11 outputs a corresponding signal to a controller 3. A second detector 12 detects the actual direction of rotation of the motor 4, and also outputs a corresponding signal to the controller 3. An electronic switch 6 is controlled by the controller 3 so as to control current fed to the motor 4 as to achieve a braking effort. The controller 3 senses the deceleration rate of the motor 4 via a current sensor 5. When the output signals of the first and second detectors 11 and 12 indicate that the axial motion of the motor 4 is opposite to that selected, the braking effort of the motor 4 is so controlled as to maintain deceleration of the motor above a predetermined level.