An electric speed-torque testing device

The speed-torque characteristics of a motor are established by the design parameters and the quality of the motor components. The speed-torque curve can be used to detect bad design factors and defective construction of a motor. Improper rotor heat treatment, wrong skew, poor slot combination, erratic switching of single-phase motors, and similar conditions are factors which can be recognized. To obtain speed-torque curves by means of a load test, point by point, is tedious, expensive, and not always sufficiently revealing.