AC Synchronous Motors

AC synchronous motors

1.Product Introduction

Synchronous motor is a common electric motor whose working principle is based on electromagnetic induction and electromagnetic field force. When a motor is connected to AC power, it generates an electromagnetic field, which causes the coils inside the stator to rotate. As the stator poles change, the coils remain synchronized with the rotating magnetic field, allowing for rotational motion.

2. Product Parameter

3. Product Feature 

1. High efficiency and energy saving

The synchronous motor adopts advanced magnetoelectric technology and is highly efficient and energy-saving. Its power factor is usually higher than 0.9, which can significantly reduce the loss of the power system and improve the operating efficiency of the entire system. In addition, the synchronous motor has low starting current, starts quickly, does not damage the power grid, and helps reduce electricity costs.

2. Good stability

When a synchronous motor is running, it can maintain stable speed and voltage because its speed is synchronized with the power grid. This kind of stability can play a practical role in situations where precise control and adjustment of rotation speed are required, such as wind power and hydroelectric generators.

3. Low voice

The synchronous motor adopts a brushless design to reduce wear during mechanical operation, thereby reducing friction noise and mechanical vibration and maintaining a quieter working environment. This enables synchronous motors to be used in noise-sensitive locations such as homes, medical equipment, studios, etc.

4. Large torque

Synchronous motors have higher starting torque and wider speed range, and can withstand larger loads. Its torque is related to the direction of the magnetic field lines, and different directions of the magnetic field lines will have different torque outputs. By controlling the direction of the magnetic field, reliable torque control and automatic torque compensation can be achieved.

5. Easy maintenance

Synchronous motors require no additional maintenance and generally provide long-term stable and reliable operation. The motor itself has a simple structure, is easy to install and maintain, and does not require routine brush replacement or complex rotor adjustment.

4.Application

They usually apply to automatic machine, vending machine .etc

5.Causes of failures and troubleshooting methods

1. Causes of failure of synchronous motors

1. The rotor loses synchronization

The speed of the synchronous motor is determined by the grid frequency. If the rotor speed is not synchronized with the grid frequency, the rotor will lose synchronization. The main reasons for this failure are as follows:

(1) The power supply voltage is too low or too high, causing the rotation speed to be out of sync;

(2) Wrong wiring or poor contact of the stator winding;

(3) The rotor winding is short-circuited;

(4) The rotor is overloaded or the load suddenly changes.

2. Motor insulation failure

The insulation of synchronous motors is an important guarantee for the safe operation of the equipment. If the insulation fails, it can easily cause equipment failure and disaster accidents. The main causes of insulation failure are as follows:

(1) The operating temperature is too high or too low, causing insulation aging, cracking or deterioration;

(2) Water, dust, strong acid, strong alkali and other substances invade the inside of the motor and corrode the insulation;

(3) The isolation equipment is unreasonable or improperly installed, causing high-voltage components to contact the outside world, causing breakdown.

3. Bearing failure

The bearings of synchronous motors are important components that bear the weight and torque of the motor rotor and ensure the normal speed of the motor. The main causes of bearing failure are as follows:

(1) Poor lubrication or aging grease, leading to bearing wear and failure;

(2) Bearing fatigue failure and bearing life expiration;

(3) The motor positioning or size is inaccurate, resulting in bearing overload or excessive wear.

2. Troubleshooting methods for synchronous motors

1. How to troubleshoot rotor synchronization failure

(1) Check whether the power supply voltage is normal. If not, the power supply equipment needs to be repaired or replaced in time;

(2) Check whether the stator winding wiring is correct. If there is an error or poor contact, it needs to be repaired and replaced in time;

(3) Check whether the rotor winding is short-circuited. If so, the winding needs to be cleaned and the rotor repaired;

(4) Check whether the rotor is overloaded or the load changes suddenly. If it is overloaded, the load needs to be reduced. If the load changes suddenly, the relevant personnel need to be notified to check the load.

2. Troubleshooting methods for insulation faults

(1) Check whether the motor operating temperature is normal, and promptly repair and replace the heat dissipation device of the motor failure;

(2) Ensure the cleanliness of the internal and external environment of the motor and prevent moisture, dust, strong acid, strong alkali and other substances from invading the inside of the motor;

(3) Strengthen motor protection measures, such as baffles, covers, clips, etc., to ensure that the isolation equipment is not damaged or accidentally touches the outside world.

3. How to troubleshoot bearing faults

(1) Strengthen the maintenance and maintenance of motor bearings and check the grease regularly;

(2) Check the service life of the bearing regularly and replace it in time if it expires;

(3) Strengthen the installation and position adjustment of bearings to ensure that the forces and moments endured by the bearings are uniform and avoid bearing fatigue failure.

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