Dynamometer manufacturers: Here are some tips for choosing a dynamometer.

In automobiles and machinery, testing with a dynamometer is required before leaving the factory. Therefore, the selection of a dynamometer has always been a headache for research institutes and scientific research institutions. How can one choose a suitable dynamometer?

1. In the testing of DC and AC motors and power tools, dynamometers are often used as testing equipment. The dynamometer mainly tests the torque, speed, and output power of the motor.

However, not every dynamometer can meet all motor testing requirements, mainly considering three aspects:

(1) Torque testing range: The torque of the dynamometer usually cannot exceed a larger torque value. If the test is completed in a short time, there generally won't be too many issues.

(2) Speed testing range: The speed of the dynamometer usually cannot exceed the maximum speed it can withstand. If used at high speeds for a long time, it will greatly shorten the lifespan of the dynamometer, especially due to mechanical wear.

(3) The power marked on the dynamometer usually refers to the power that the dynamometer can absorb, as general dynamometers (hysteresis, magnetic powder, eddy current dynamometers) rely on absorbing heat to achieve energy consumption, which is the output power of the tested AC or DC motor or power tool. Strictly speaking, this indicator should not be exceeded; otherwise, the dynamometer can easily be damaged due to heat dissipation issues.

2. The selection of a dynamometer must not only meet the three main technical indicators of speed, torque, and power but also check if it meets the specific testing requirements. Generally, motors need to test parameters such as no-load speed, no-load loss, and locked rotor torque, which also need to be considered carefully!

3. When selecting a dynamometer, all testing data of the motor should be between 30% and 90% of the dynamometer's performance parameters. This is because the testing accuracy of the dynamometer in this range is well guaranteed, mainly divided into three parts: the mechanical part of the dynamometer, the accuracy range of the speed and torque sensors, and the display accuracy of the speed, torque, and power measurement instruments.

4. The commonly used dynamometers can be classified as follows: hysteresis dynamometers, magnetic powder dynamometers, asynchronous dynamometers (electric dynamometers), eddy current dynamometers, and less commonly used dynamometers (permanent magnet synchronous motors, servo motors, etc.).