Stator back electromotive force (EMF) test.

AIP shares with you the"Stator back electromotive force (EMF) test".

November 09, 2023

Stator back electromotive force (EMF) test

A motor is a device that converts electrical energy into mechanical energy, and one of its core components is the stator. The stator is the fixed part of the motor, which consists of the stator core and stator winding. The stator winding is the circuit part of the motor, which generates a magnetic field through the applied voltage and interacts with the magnetic field of the rotor to make the rotor rotate. However, when the motor is running, there is not only the applied voltage in the stator winding, there is also an electromotive force in the opposite direction to the applied voltage, which is the back electromotive force. So, what is the back electromotive force? Why do we need to test the motor stator for back electromotive force? What is the significance of the back electromotive force test? This article will answer these questions for you.

Motor stator

Ⅰ. What is the motor back electromotive force

In the motor operation process, when the motor rotor rotates in the stator magnetic field, the stator windings will produce an induced electromotive force. The direction of this induced electromotive force is opposite to the motor's supply electromotive force, which is called the back electromotive force. Back electromotive force is a natural phenomenon during the operation of the motor, and the design and working conditions of the motor are closely related.

Ⅱ. The motor back electromotive force test reasons

The main reasons for the motor back electromotive force test are as follows: firstly, by testing the reverse potential, we can understand the performance and operating state of the motor, which provides an important basis for the design and control of the motor. Secondly, the waveform and amplitude of the reverse potential can reflect the faults of the motor, such as open or short circuit winding. Through timely detection of these faults, motor damage and accidents can be avoided. Finally, for some high-voltage and high-current application scenarios, such as electric vehicles and wind power generation, the excessively high reverse potential may lead to system overvoltage, which threatens the safety of the equipment and the lives of the personnel. Therefore, the motor reverse potential test is crucial for the research and development, production, and use of electric motors.

Ⅲ.  The significance of motor back electromotive force test

Motor back electromotive force test has important significance in the field of motors. First of all, the test can obtain accurate data on the motor's back electromotive force, which provides an objective basis for the performance evaluation of the motor. Secondly, the test results can be used for fault diagnosis and prevention of the motor to improve the reliability and stability of the motor. In addition, the back electromotive force test can also provide guidance for the optimized design and control strategy of the motor to achieve efficient operation energy saving and emission reduction of the motor. In practical application, accurate reverse potential test data has an unignorable role in ensuring equipment safety, improving product quality, and reducing operating costs.


To summarize, the motor stator back electromotive force test is of great significance in the process of motor research and development, production, and use. Through accurate back electromotive force testing of the motor, the performance and failure of the motor can be understood in a timely manner, providing strong support for the optimized design and control of the motor. At the same time, in practical application, conducting motor stator reverse potential tests helps to ensure the safe and reliable operation of the motor, reduce the risk of accidents, and improve the overall performance and economic efficiency of the equipment. Therefore, we should pay full attention to the role and value of the motor stator reverse potential test, and constantly improve the test technology and methods to contribute to the innovation and development of the motor.

Stator back electromotive force (EMF) tester

For more details about stator back electromotive force (EMF) tester and motor stator tester, please contact AIP via Tel/Whatsapp: +86-13969776659, E-mail:, we will be happy to communicate with you!