How to choose a suitable dynamometer?

　　Both motors and engines need to be tested with a dynamometer when they leave the factory, sodynamometerthe selection of dynamometers has always been a headache for manufacturers, repair shops, research institutes, and laboratories. So how can one choose the right dynamometer?

　　1. In AC/DC motor testing, dynamometers are often used to test the torque, speed, and output power of the motor.

　　However, not every dynamometer can meet all motor testing requirements, and three main factors need to be considered:

　　(1) The torque testing range, which usually should not exceed the dynamometer's torque.

　　(2) The speed testing range, as the speed of the dynamometer is usually a limit that is hard to exceed; if used 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, because ordinary dynamometers (hysteresis, magnetic powder, eddy current dynamometers) consume energy to absorb heat, which is the output power of the tested AC/DC motor or electric tool. Strictly speaking, this indicator should not be exceeded; otherwise, the dynamometer can easily burn out 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 consider whether it meets the specific testing requirements. Generally, motors need to test parameters such as no-load speed, no-load loss, and stall torque, which also need to be given special consideration!

　　3. When selecting a dynamometer, all test data of the motor should be between 20% to 90% of the dynamometer's performance parameters. This ensures the testing accuracy of the dynamometer within this range, which is 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 and torque power measuring instrument.

　　4. Commonly used dynamometers mainly include the following types: hysteresis dynamometers, magnetic powder dynamometers, electric power dynamometers, eddy current dynamometers, and less commonly used dynamometers (such as permanent magnet synchronous motors, servo motors, etc.).