Abstract: A system for measuring temperature in an electric motor includes an interface communicatively coupled to a motor and a processor coupled to the interface. In various embodiments, the processor is configured to obtain access to a temperature-measuring electrical path, where the temperature-measuring electrical path rotates relative to a magnetic field, and the temperature-measuring electrical path has no net induced voltage due to magnetic field as the temperature-measuring electrical path rotates relative to the magnetic field. The processor may be further configured to determine a resistance associated with the temperature-measuring electrical path, and determine a temperature of the motor based at least in part on the resistance.

Abstract: A control device for a permanent magnet motor serving as both a starter for an engine and a generator in a motor vehicle is disclosed.

Abstract: An improved motor controller is intended for use with an induction motor and has a control loop which includes an auxiliary winding, a capacitor and a saturable reactor. The auxiliary winding is electro-magnetically coupled to the stator winding in a manner such that the capacitive reactance of the control loop is effectively in parallel with the magnetizing reactance and the rotor leakage reactance of the motor. The control loop is devoid of any direct electrical connection to the motor.By varying the magnitude of current in its D-C control winding, the inductance of the reactor is adjusted so that the capacitive reactance of the control loop, as electro-magnetically reflected into the motor, is generally in resonance with the parallel combination of the magnetizing reactance and the rotor leakage reactance.

Abstract: A motor control circuit comprises first, second and third saturable reactors connected between three supply lines and the three phases of a motor. The reactors can be excited to energize the motor to give a high torque output in a forward direction. Two further reactors ("reverse" reactors) are connected between the second and third supply lines and the third and second motors phases.In the "forward" condition, the "reverse" reactors are unexcited and have line voltage across them. To drive the motor in the reverse direction at a lower torque level, the first reactor and the "reverse" reactors are excited at a lower level and the second and third reactors are unexcited. However, the latter two reactors are made to operate at a point above the magnetization curve knee point by passing current through them up to their full-load current, and they are thereby "stretched" across a voltage only slightly (say 13%) above the phase voltage. Hence, only the fourth and fifth reactors have to withstand full line voltage.