The structure of the permanent magnet motor

The stator structure of the permanent magnet synchronous motor is basically the same as that of the asynchronous motor, which plays the role of receiving and outputting electric energy and generating a rotating magnetic field. There is not much difference in their structural forms. The stators of the permanent magnet synchronous motor and the asynchronous motor are composed of magnetic stator cores and windings, bases, end covers and other components.

Schematic diagram of permanent magnet motor stator and rotor

Rotor structure

The permanent magnet synchronous motor has pre-magnetized (magnetized) permanent magnetic materials embedded on the surface or inside of the rotor, which can provide the necessary air gap magnetic field for the motor.
The use of this rotor structure can effectively reduce the size of the motor, reduce losses, and improve efficiency. Motors with other structures generate magnetic fields by passing current through the motor windings.

Schematic diagram of the whole structure of permanent magnet motor (permanent magnet servo motor)

Technical advantages of permanent magnet motors

There is no secondary conductor in the rotor of the permanent magnet motor. The permanent magnet on the rotor is attracted and repelled by the rotating magnetic field of the stator coil. The rotor rotates at a synchronous speed, so there is basically no power loss in the rotor, the total loss of the motor is reduced, and the motor efficiency is improved. There are secondary conductors on the rotor of the asynchronous motor. The rotating magnetic field generated by the stator winding and the speed difference of the rotor rotation are used to generate induced voltage in the secondary conductor, thereby generating current and generating torque. Therefore, the permanent magnet motor can obtain greater torque with the same current, and the motor has better power saving performance.

High efficiency

Small moment of inertia

Small inertia moment, with excellent acceleration and deceleration characteristics

Low temperature rise

Taking a 200KW 1450rpm motor as an example, the rotor loss is 0, and the operating temperature of a permanent magnet motor is 18.5 degrees lower than that of an asynchronous motor.

Small current, saving cables

Since permanent magnet motors are highly efficient, the same output requires less current.

This saves cable costs!!

Low motor loss

Long bearing life

Bearing brand: SKF or FAG

Because the rotor has no current loss and no temperature rise, and the stator is designed for fast heat conduction, a heat dissipation device is installed, and the design of the cooling water cooling channel (air cooling channel) is optimized, the bearing can maintain a low temperature operation and greatly extend its lifespan, up to 100,000 hours)

Energy-saving, silent, maintenance-free permanent magnet direct-drive motor

The low-speed, high-power dedicated permanent magnet drive system adopts an optimized design. The motor itself has a high efficiency, which can reach 93%~97%, and a high power factor, which can reach 0.99, which increases the proportion of active power in the system. At the same time, since there is no need for gearbox transmission, the transmission efficiency of the whole machine is higher than that of the high-speed motor + gearbox solution. For example, from starting to running and then stopping the belt conveyor, the average load rate of the motor during the entire operation process is about 40%, and the maximum load rate is less than 60%. Since the efficiency and power factor of the asynchronous motor are closely related to the load rate, when the load rate is less than 50%, the efficiency and power factor drop sharply. The efficiency and power factor of the permanent magnet motor are less affected by the load, and can maintain extremely high efficiency and power factor within the load rate of 20%~120%.

Under the same load and working system, the permanent magnet direct drive system saves about 10~30% of power loss compared with the asynchronous reduction drive system!

Technical advantages of permanent magnet direct drive motor

The size of the equipment is greatly reduced

Greatly reduced noise

The power saving rate is more than 15%

Reduced spare parts and maintenance costs

Assisted magnet synchronous motor

Product Description:

The fully enclosed, self-fanned, air-cooled, ultra-high-efficiency three-phase magneto-assisted synchronous reluctance motor is designed and manufactured using the new magneto-assisted synchronous reluctance motor technology. The energy efficiency meets the national standard first-level energy efficiency requirements (IEC standard: IE5), and has the characteristics of high efficiency, large starting torque, low noise and vibration. The motor does not contain rare earth permanent magnet materials, and the structure is simple, stable and reliable. It adopts standard small and medium-sized asynchronous motor casing (the specification with a speed of 3000r/min is reduced by 1-2 machine sizes) to facilitate on-site replacement. It is an efficient motor drive solution that saves energy and rare earth resources. It can be used to drive various general mechanical equipment, such as fans, water pumps, air compressors, textile machinery, etc. It meets the driving needs of various equipment in the field of industrial automation.

Ferrite auxiliary synchronous reluctance motor

Technical Specifications

Model Type	permanent magnet assisted synchronous reluctance motor	efficiency class	IE5
Voltage level	AC380V	Vibration level	B
Insulation class	F/H	Protection grade	IP54/IP55
Methods of cooling	IC411/IC416	Mounting arrangement	B3,B5,B35
sensor	sensorless or Incremental encoder	Shaft extension	No keyway,One keyway,Two keyway
site condition	altitude:≤1000m Temperature:-15°C-40C

Self-starting Three-Phase PMSM

Basic Parameters：

Rated voltage	380V
Rated frequency	50HZ
Pull-out torque	More than 1.4-2.0 times
Efficiency(25%-125%load)	92%~98%
Insulation grade	F
Protection grade	IP55
Cooling mode	IC411
Work mode	S1
Installation	The same as Y2,YX3

Characteristics

1.High efficiency energy saving：

The motor could be self-started and substitute three-phase asynchronous motors;
Rare earth permanent magnet that generate synchronous torque;
In the 25%-125% range of the load with high efficiency, high power factor , high reliability etc. 8-20% more effective,10-40% electricity-saving and power factor 0.08-0.18 higher than three-phase asynchronous motors;
The operating temperature are 10-20 degrees Celsius lower than asynchronous motors under the same power.

2.High reliability：

By long time study of factors that may cause excitation failure,we have found a way to avoid this by improving the quality and providing technical protection of rare-earth permanent magnets. The motor proved to run well even under poor working environments.

3.High stability：

When the motor get running, it forms certain power angle of the excitation magnetic field brought by permanent magnet on the rotor and rotating magnetic field brought by the three-phase winding, which protects the motor and will not cease operating even under the sharp increase or drop of the load. Self-starting three-phase PMSM has the feature of high operation stability with excellent carrying capacity and recovery performance.

4.Starting capacity：

More than 4-pole motor or above could get immediate start under full load starting directly operation,since it has good pull-in synchronous capacity.

5.Versatility：

This series could be widely used as they are the same to Y2、YX3 series in respects of installation structure, installation size and protection level.

6.Low vibration and low noise：

The self-starting three-phase PMSM are small, energy-efficient,with smaller power loss, and the volume of ventilation are less than asynchronous motors,therefore much quieter. As to the reasonable design of air gap, the motor has good current waves.The pulsating torque and electromagnetic noises reduce appreciably 10-40 decibel less than asynchronous motors.

7.Wide applicability：

This series of motors has complete specifications and wide adaptability. It can be self-started to directly replace three-phase asynchronous motors, and can also be equipped with a frequency converter for stepless speed regulation. The product has high efficiency and superior operating performance in the entire load range. It is the product with the best energy-saving effect. It is suitable for transmission equipment in water pumps, fans, compressors, petrochemicals, chemical fibers, textile machinery, transportation machinery, mixers, agricultural machinery, packaging, food machinery, papermaking, printing and dyeing, metallurgy and other industries.

In short, in addition to high efficiency and energy saving, the self-starting three-phase permanent magnet synchronous motor does not require a frequency converter. The current waveform is an ideal sine wave. When used, it has no harmonic interference to the power grid. It has good electromagnetic compatibility and strong adaptability. It is not only suitable for long-term continuous operation in occasions with large load changes, but also suitable for frequent starting load requirements. It is an excellent product for replacement.

This series of three-phase permanent magnet motors, whether using asynchronous starting or variable frequency starting, are all synchronous operation, with no slip, and no fundamental wave iron and copper loss in the rotor. The rotor is excited by permanent magnets and does not require reactive excitation current. The power factor is high, about 1, and the reactive current is small, so the stator current drops significantly, the stator copper loss is greatly reduced, and the efficiency is significantly improved. It can be seen that the three-phase permanent magnet synchronous motor saves energy by reducing its own various losses.

The structure of the permanent magnet motor

Schematic diagram of permanent magnet motor stator and rotor

Rotor structure

Schematic diagram of the whole structure of permanent magnet motor (permanent magnet servo motor)

Technical advantages of permanent magnet motors

Small inertia moment, with excellent acceleration and deceleration characteristics

Taking a 200KW 1450rpm motor as an example, the rotor loss is 0, and the operating temperature of a permanent magnet motor is 18.5 degrees lower than that of an asynchronous motor.

Since permanent magnet motors are highly efficient, the same output requires less current.

This saves cable costs!!

Bearing brand: SKF or FAG

Energy-saving, silent, maintenance-free permanent magnet direct-drive motor

Under the same load and working system, the permanent magnet direct drive system saves about 10~30% of power loss compared with the asynchronous reduction drive system!

Technical advantages of permanent magnet direct drive motor

The size of the equipment is greatly reduced

Greatly reduced noise

The power saving rate is more than 15%

Reduced spare parts and maintenance costs

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Product Description:

Ferrite auxiliary synchronous reluctance motor

Technical Specifications

Basic Parameters：

Characteristics

1.High efficiency energy saving：

2.High reliability：

3.High stability：

4.Starting capacity：

5.Versatility：

6.Low vibration and low noise：

7.Wide applicability：

Energy-saving, silent, maintenance-free permanent magnet direct-drive motor

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