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Permanent Magnet Motor Reliable Manufacturer

Adopting high efficiency NdFeB permanent magnet, no excitation loss, after special rotor structure design, greatly reduces iron loss and stray loss, the efficiency of the whole machine reaches IE4 standard or more, 5-10% higher than the efficiency of three-phase asynchronous motor, power factor increased by 10-15% or more.

permanent magnet motor插图
Energy efficiency standards comply with IE4、IE5 grade Work mode S1~S10
Installation dimensions comply with IEC standard Control mode variable frequency vector control
Power range 5.5〜6300kW Installation type IMB3 IMB5 IMB35 V1
Cooling way IC411 or IC416、IC410、IC71W、IC81W Rated speed 200、300、500、600、750、1000、1500 、3000、3600RPM
Insulation class F(H) Optional parts Encoder, spiral transformer, PTC, PT100
Protection grade IP55(IP23 start type is customizabe) Wiring type junction box (aviation plug can be customized as per requirement)
Connection STAR、DELTA Rated voltage 380V 660V 1140V 3300V 6KV 10KV

Time to Change Your Motors

All You Need to Know About PMSM Motor

permanent magnet motor插图1
permanent magnet motor插图2

The structure of the permanent magnet synchronous motor

what is the Permanent Magnet Synchronous motor?

The PERMANENT MAGNET SYNCHRONOUS MOTOR is mainly composed of the stator, rotor, chassis, front-rear cover, bearings, etc. The structure of the stator is basically the same as that of ordinary asynchronous motors, and the main difference between the permanent magnet synchronous motor and other kinds of motors is its rotor.

The permanent magnet material with pre-magnetized (magnetic charged) magnetic on the surface or inside the permanent magnet of the motor, which provides the necessary air gap magnetic field for the motor. This rotor structure can effectively reduce the motor volume, reduce loss and improve efficiency.

permanent magnet motor插图3
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Depending on how magnets are attached to the rotor and the design of the rotor, permanent magnet synchronous motor can be classified into two types:

Surface permanent magnet synchronous motor (SPMSM)
Interior permanent magnet synchronous motor (IPMSM).

SPMSM mounts all magnet pieces on the surface, and IPMSM places magnets inside the rotor.

Product Catagory

Why choose Permanent Magnet Motors?

High energy saving rate

More than 5% more energy-saving than ordinary motors, more than 15% more energy-saving than DC machines.

Low noise

Permanent magnetic direct drive equipment operating noise below 80 decibels

High overload capability

Can achieve more than 2 times overload start-up and not impact the grid, small investment in power distribution facilities

High motor performance

Power factor up to 0.99 Motor efficiency is usually more than 95%

Small size

Compared with asynchronous motor small size, light weight, stable operation

Low temperature rise

lower at least 10K-15K than ordinary low and high voltage motors

permanent magnet motor插图9

Working Principle

The principle of a three-phase AC permanent magnet synchronous motor is as follows: In the motor’s stator winding into the three-phase current, after the pass-in current, it will form a rotating magnetic field for the motor’s stator winding.

Because the rotor is installed with the permanent magnet, the permanent magnet’s magnetic pole is fixed, according to the principle of magnetic poles of the same phase attracting different repulsion, the rotating magnetic field generated in the stator will drive the rotor to rotate, the rotation speed of the rotor is equal to the speed of the rotating pole produced in the stator.

differences between the Permanent Magnet Motor and Asynchronous motor

permanent magnet motor插图10
permanent magnet motor插图11
01. Rotor structure

Asynchronous motor: The rotor consists of an iron core and a winding, mainly squirrel-cage and wire-wound rotors. A squirrel-cage rotor is cast with aluminum bars. The magnetic field of the aluminum bar cutting the stator drives the rotor.

PMSM Motor: The permanent magnets are embedded in the rotor magnetic poles, and are driven to rotate by the rotating magnetic field generated in the stator according to the principle of magnetic poles of the same phase attracting different repulsion.

02. Efficiency

Asynchronous motors: Need to absorb current from the grid excitation, resulting in a certain amount of energy loss, motor reactive current, and low power factor.

PMSM Motor: The magnetic field is provided by permanent magnets, the rotor does not need exciting current, and the motor efficiency is improved. 

permanent magnet motor插图12
03. volume and weight

The use of high-performance permanent magnet materials makes the air gap magnetic field of permanent magnet synchronous motors larger than that of asynchronous motors. The size and weight are reduced compared to asynchronous motors. It will be one or two frame sizes lower than asynchronous motors.

04. Motor starting current

Asynchronous motor: It is directly started by power frequency electricity, and the starting current is large, which can reach 5 to 7 times the rated current, which has a great impact on the power grid in an instant. The large starting current causes the leakage resistance voltage drop of the stator winding to increase, and the starting torque is small so heavy-duty starting cannot be achieved. Even if the inverter is used, it can only start within the rated output current range.

PMSM Motor: It is driven by a dedicated controller, which lacks the rated output requirements of the reducer. The actual starting current is small, the current is gradually increased according to the load, and the starting torque is large. 

05. Power Factor

Asynchronous motors have a low power factor, they must absorb a large amount of reactive current from the power grid, the large starting current of asynchronous motors will cause a short-term impact on the power grid, and long-term use will cause certain damage to the power grid equipment and transformers. It is necessary to add power compensation units and perform reactive power compensation to ensure the quality of the power grid and increase the cost of equipment use.

There is no induced current in the rotor of the permanent magnet synchronous motor, and the power factor of the motor is high, which improves the quality factor of the power grid and eliminates the need to install a compensator.

06. Maintenance

Asynchronous motor + reducer structure will generate vibration, heat, high failure rate, large lubricant consumption, and high manual maintenance cost; it will cause certain downtime losses.

The three-phase Permanent magnet synchronous motor drives the equipment directly. Because the reducer is eliminated, the motor output speed is low, mechanical noise is low, mechanical vibration is small, and the failure rate is low. The entire drive system is almost maintenance-free.

No More Worries About Demagnetization

The permanent magnet, the core material of the permanent magnet motor, will cause irreversible demagnetization under high temperature, high current impact, and severe rigid collision. ENNENG company adopts the following technologies to prevent this problem.

Prevention Program Prevent high temperature demagnetization Prevent high current impact demagnetization Prevent violent rigid collision demagnetization
Measure 1 Select permanent magnet material N38SH/N38UH resistant to above 150℃ Built-in placement of magnets Built-in placement of magnets
Measure 2 Carry out the internal thermal simulation of the motor to ensure that the thermal concentration of the motor does not exceed the motor material temperature resistance Check the maximum demagnetization operating point when the motor is short-circuited, so that there is no irreversible demagnetization when the motor is short-circuited. The rotor magnetic pole is made of soft silicon steel sheet


Permanent magnet synchronous motors can be combined with frequency converters to form the best open-loop steppless speed control system, which has been widely used for speed control transmission equipment in petrochemical, chemical fiber, textile, machinery, electronics, glass, rubber, packaging, printing, paper making, printing and dyeing, metallurgy and other industries.

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