When it comes to motor testing, people immediately think of the dynamometer, a type of motor testing equipment. However, in reality, when faced with increasingly complex industry applications such as electric vehicle motor testing, the dynamometer is gradually revealing its shortcomings, which can be traced back to the construction of the dynamometer.
The structure of a dynamometer is simple, consisting of a cabinet and a test bench. The test bench, also known as the dynamometer head, generally refers to a style where the torque speed sensor and brake are integrated. The test bench includes an installation base, torque and speed sensors, and mechanical loads (brakes) for torque loading during motor testing, simulating different operating conditions of the motor; The cabinet includes an electrical parameter tester, a motor tester, a dynamometer controller, a power supply, etc., used for driving the system and testing the motor.
Why is it said that traditional dynamometers cannot meet the testing needs of new industries, such as electric vehicle motors? This mainly discusses a core component of the dynamometer - the mechanical load (brake). The mechanical load of a dynamometer generally uses a brake, and some also use an electric motor to provide reverse rotational torque to the tested motor, absorb the power of the tested motor during operation, achieve the "loading" of the tested motor, and simulate its actual operating conditions.
To simulate the actual operating conditions of the tested motor, the loading capacity of the dynamometer must cover the entire operating range of the tested motor in order to meet the requirements of simulating "all operating conditions". Simply put, it is the TN curve of the mechanical load of the dynamometer, which must cover the TN curve of the tested motor in order to test the entire TN characteristics of the tested motor.