POWER DRIVE UNIT WITH POWER-OFF DYNAMIC BRAKE

摘要

An electromechanical actuator power drive unit for dynamic braking is provided, comprising an electric motor with a stator, a rotor that rotates with respect to the stator, and windings fixed to the stator. There is a control unit configured to supply a current to the windings. When the control unit is not supplying current to the windings, an electrical device allows current to flow through a parallel current path to the windings. The new current is generated by the interaction of a roller connected with a gear set to the rotor. The roller, and therefore the rotor, is urged in a rotational direction by the translational velocity of a load in contact with the roller. The new current generated by the rotating rotor flows in the opposite direction as the first current supplied by the power supply unit and creates a dynamic braking torque in the electric motor.

主权项

1. An electromechanical actuator power drive unit for dynamic braking comprising:
an electric motor comprising a stator and a rotor that is rotatable with respect to the stator, and windings; a control unit configured to supply a first electric current to the windings; an electrical device in series with the windings; wherein the electrical device allows current to flow through a parallel current path when the control unit is not supplying the first electric current to the windings; at least one roller operably connected with a transmission to the rotor, the at least one roller configured to receive a load, and rotate when the load translates over the at least one roller; wherein the translation of the load urges the rotation of the at least one roller, wherein the electrical device allows current to flow through the parallel current path and when the control unit is not supplying the first electric current to the windings, the rotating rotor generates a second electric current in the windings in the opposite direction as the first electric current; and wherein the second electric current creates a dynamic braking torque in the electric motor.