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What is The Difference Between Permanent Magnet Synchronous Motor and Induction Asynchronous Motor?

Jan. 21, 2021

At present, there are two main types of vehicle motors that can be promoted and used in the field of new energy. They are permanent magnet synchronous motors and AC asynchronous motors. Among them, the former is quite popular with domestic new energy car companies and has many applications, while the latter is not so lucky. Not to mention the domestic users, even the global users are also very few. So, why can permanent magnet synchronous motors win the favor of so many new energy and traditional car companies? What is the difference between a permanent magnet synchronous motor and an AC motor? Synchronous Motor Manufacturers tell you the answer

Permanent Magnet Synchronous Motor

Permanent Magnet Synchronous Motor

What is the difference between permanent magnet synchronous motor and AC asynchronous motor?

1. Different structure settings

From the structural level, the structure of the permanent magnet synchronous motor is more complicated than that of the AC asynchronous motor, and the cost output is higher. However, the permanent magnet synchronous motor has a smaller volume and a lighter weight.

The Permanent Magnet Synchronous Motor is mainly composed of a rotor, an end cover and a stator. Its stator structure is very similar to that of an ordinary induction motor. However, its rotor structure design is very unique, with high-quality permanent magnet poles placed on the rotor and energized Can generate rotating magnetic field.

As for the structure of the asynchronous motor, it can be divided into two parts: the stator and the rotor. Of course, in addition to these, there are auxiliary parts such as end covers and fans. It is worth noting that because the stator of the asynchronous motor generates an excitation rotating magnetic field and absorbs electric energy from the power supply, its stator is an armature.

2. Different working principles

Working principle level, the permanent magnet synchronous motor is excited by the permanent magnet to generate a synchronous rotating magnetic field. The three-phase stator winding reacts through the armature under the action of the rotating magnetic field to induce a three-phase symmetrical current. At this time, the rotor kinetic energy is converted into electrical energy, and the permanent magnet is synchronous The motor is used as a generator;

Conversely, when three-phase symmetrical current is applied to the stator side, since the three-phase stator has a difference of 120 degrees in space, the three-phase stator current generates a rotating magnetic field in space. The rotating magnetic field of the rotor moves under the influence of electromagnetic force and converts electrical energy into kinetic energy of the rotor. , Permanent magnet synchronous motor is used as a motor.

The AC Asynchronous Motor feeds a symmetrical alternating current to the three-phase stator windings to generate a rotating magnetic field to cut the rotor windings, thereby generating induced current in the rotor windings, and the current-carrying rotor conductor generates electromagnetic force under the action of the stator rotating magnetic field to act on the motor shaft to form an electromagnetic Torque drives the motor to rotate in the direction of the rotating magnetic field.

It is worth noting that when the conductor cuts the lines of magnetic force in the magnetic field, an induced current will be generated inside the conductor, and then work hand in hand with the induced magnetic field to jointly apply a driving force to the rotor of the motor to drive the rotor to move.

Of course, in addition, the raw materials used in the two motors cannot be ignored. It should be known that permanent magnet materials such as neodymium iron boron used in permanent magnet synchronous motors belong to important rare earth resources, while rare earth resources are very scarce in Europe and the United States. On the other hand, my country has 70% of the world’s rare earth resources. The total output accounts for 80% of the world's total.

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