1. In the testing of AC/DC motors and electric tools, the dynamometer is often used as a testing equipment. The dynamometer mainly tests the torque, speed, and output power of the motor. However, not every electric dynamometer can meet all motor testing requirements, mainly considering three factors:
1、 The torque testing range, the torque of the dynamometer is usually the maximum torque value that cannot be exceeded.
2、 The range of speed testing is that the torque sensor speed of the dynamometer usually cannot exceed the maximum speed it can withstand. If it is used for a long time at excessive speed, it will greatly shorten the service life of the dynamometer, especially mechanical wear.
3、 The power usually indicated on a dynamometer refers to the power that the dynamometer can absorb, because typical dynamometers (hysteresis, magnetic powder, eddy current dynamometers achieve energy consumption by absorbing heat) are the output power of the tested AC/DC motor or electric tool. Strictly speaking, this indicator cannot be exceeded, otherwise the dynamometer is easily burned out due to the inability to dissipate heat;
2. The selection of an electric dynamometer should not only meet the three main technical indicators of speed, torque, and power, but also check whether it meets the specific testing requirements. Generally, motors need to be tested for parameters such as no-load speed, no-load loss, and locked rotor torque, which also need to be carefully considered!
3. When selecting a dynamometer, all test data for the best motor should be between 30% and 90% of the dynamometer's performance parameters. Because the testing accuracy of the dynamometer in this range is guaranteed.
4. The commonly used dynamometers are mainly classified into the following categories: hysteresis dynamometer, magnetic powder dynamometer, eddy current dynamometer, and electric dynamometer (DC, AC electric dynamometer).