Electric Motors

Electric Motor Torquemeter Applications

Helping to Make Better Electric Motors

Accurate torque measurement with fast response is critical to establishing motor efficiency, characterizing motor performance and developing performance curves. Himmelstein offers both bearing-mounted and bearingless torque transducers with ultra-precise and accurate torque and speed measurement for determining the mechanical output power of virtually any electric motor.

Electric Motor

Electric Motor Torque, Speed and Output Horsepower Tester

Combined with an appropriate torque sensor, Himmelstein’s Model 721+ Mechanical Power Instrument will display current data of torque, speed and shaft power. A motor breakdown torque test can be performed loading the motor above the breakdown torque and then the instrument will automatically capture and hold breakdown torque, speed and shaft power. Held breakdown values can be displayed and classified in or out of limits, and may be downloaded to a computer.

Next, the load is brought to specified points, and torque, speed and shaft power are read from the display and/or downloaded to the attached computer. Before testing the next motor, the Model 721 is reset from the front panel or via its I/O.

Breakdown Torque Plus Pull-Up Torque and Speed Measurement

This is a common task for our Model 721+ instrument. Through an installed torque transducer, the test motor drives an inertia load fitted with a 600 PPR speed sensor. At test start, the Model 721+ displays current data. When CH 2 (speed) low limit signals that speed is above the start windings’ low-end variations, the Do Max/Min function is automatically invoked for CH 1 (torque). Thereafter, when CH 1 detects a Maxima, Channel 1 is held, capturing breakdown torque. When CH 3 reaches the pull-up torque, both CH 3 and CH 2 (pull-up speed) are held. All three held values can be displayed and are automatically classified. The 721+ ignores winding switching torques and the near zero torque condition at the end of the run.