How to measure the quality of a series motor? Why is the series motor noisy?

How to measure the quality of series motor

Here are some methods to measure the quality of series motors:

Resistance measurement method: Use a multimeter to measure the resistance value of the motor. The normal resistance value of a series-excited motor should be within a certain range. If the value deviates too far, it means that the motor may have an open circuit or short circuit problem.

Voltage measurement method: Connect the motor to the power supply and use a multimeter to measure the voltage of the motor. If the voltage is too low, it means that the motor may have a short circuit problem.

Rotation measurement method: Connect the motor to the power supply and gently push the motor rotor with your hand. If the motor is difficult to rotate or does not rotate, it means that the motor may have problems such as rotor jamming or bearing damage.

Sound measurement method: Connect the motor to the power supply and listen to see if there is any abnormal sound when the motor is running. If there is excessive noise or abnormal sound, it means that the motor may be worn or loose.

Temperature measurement method: When the motor is running, use a thermometer to measure whether the temperature of the motor casing is too high. If the temperature is too high, it means that the motor may have problems such as overload or poor heat dissipation.

These methods can preliminarily determine whether there is a problem with the motor, but if you want to further determine the specific problem with the motor, you need to use more professional testing tools or equipment for testing, or ask professional technicians to repair it.

Why is the series motor noisy?

The reasons why the series motor is noisy are as follows:

Magnetic field noise: The magnetic field generated between the rotor and stator of the series motor will cause magnetic field noise. When the motor is running, the magnetic field will cause vibration, and the vibration will produce sound.

Mechanical vibration: When the motor is running, mechanical vibrations will be generated due to friction and impact between mechanical parts, which will also cause noise.

Ventilation noise: When the motor is working, the motor fan will generate wind noise, especially when it runs at high speed, the noise will be louder.

Electromagnetic interference: When the motor is running, it will generate electromagnetic fields, which may interfere with other electronic devices and may also be interfered by other electronic devices. These interferences will cause noise.

In order to reduce the noise of the series motor, the following measures can be taken:

Choose low-noise motors: Some motor manufacturers will optimize the design for noise, and choosing these low-noise motors can reduce noise.

Optimize motor structure: Optimizing the mechanical structure of the motor and reducing friction and impact between mechanical parts can reduce mechanical vibration and noise.

Optimizing motor control: By optimizing the control algorithm of the motor, the electromagnetic interference of the motor can be reduced, thereby reducing noise.

Use sound insulation materials: Using sound insulation materials around the motor, such as foam plastics, rubber, etc., can reduce the noise transmission of the motor.