Surface PMSM Variable Frequency Adjustable Speed AC Motor ODM OEM

The characteristics and advantages of permanent magnet motors

Motor from the source of excitation can be divided into two categories: permanent magnet motor, and electric excitation motor. A permanent magnet motor is an electric motor that produces an excitation magnetic field from a permanent magnet. The most widely used three-phase asynchronous motors in industry and civil use, such as Y-Series, Y2-Series, YE2-Series, YX3 Series, Series YB, series YB2 series, etc. all belong to electric excitation motors. ENNENG Motor products are ultra-efficient permanent magnet synchronous motors.

Compared with traditional electric excitation motors, permanent magnet motors, especially rare earth permanent magnet motors, have the advantages of simple structure, reliable operation, small size, lightweight, small loss and high efficiency, and flexible and diverse shape and size of the motor. The application is extremely wide, covering almost all areas of aerospace, national defense, industrial and agricultural production, and daily life.

The permanent magnet synchronous motor has the following characteristics:

• Rated efficiency is 2% to 5% higher than normal asynchronous motors;
• The efficiency rises rapidly with the increase of the load. When the load changes within the range of 25% to 120%, it maintains high efficiency. The high-efficiency operating range is much higher than that of ordinary asynchronous motors. Light-load, variable-load, and full-load all have significant energy-saving effects;
• Power factors up to 0.95 and above, no reactive compensation required;
• The power factor is greatly improved. Compared with asynchronous motors, the running current is reduced by more than 10%. Due to the decrease in operating current and system losses, energy-saving effects of about 1% can be achieved.
• Low-temperature rise, high power density: 20K lower than three-phase asynchronous motor temperature rise, design temperature rise is the same and can be made into a smaller volume, saving more effective materials;
• High starting torque and high overload capacity: according to requirements, it can be designed with high starting torque (3-5 times) and high overload capacity;
• The variable frequency speed control system is used, which is better in dynamic response and better than that of asynchronous motors.
• The installation dimensions are the same as the asynchronous motors currently widely used, and the design and selection are very convenient.
• Due to the increase in power factor, the visual power of the power supply system transformer is greatly reduced, which improves the power supply capacity of the transformer, and can also greatly reduce the cost of the system cable (new project);
• When the new project is built, all the drive systems use permanent magnet synchronous motors, the project investment is basically the same as the use of asynchronous motors, and the project can continue to obtain energy-saving benefits after the project is put into operation;

In the general industrial sector, the replacement of low-voltage(380/660/1140V) high-efficiency asynchronous motors, the system saves 5% to 30% energy, and the high-voltage(6kV/10kV) high-efficiency asynchronous motors, system saves 2% to 10%.

Application of rare earth permanent magnet motor

Due to the superiority of rare earth permanent magnet motors, their applications are becoming more and more extensive. The main application areas are as follows:

Focus on the high efficiency and energy saving of rare earth permanent magnet motors. The main application objects are large power consumers, such as rare earth permanent magnet synchronous motors for textile and chemical fiber industries, rare earth permanent magnet synchronous motors for various mining and transportation machinery used in oil fields and coal mines, and rare earth permanent magnet synchronous motors for driving various pumps and fans.

The rotor magnetic circuit structure of the permanent magnet synchronous motor is different, so the operation characteristics and control system of the motor are also different. According to the different positions of the permanent magnets on the rotor, permanent magnet synchronous motors can be mainly divided into the surface type and interior type. In the surface-type permanent magnet synchronous motor, the permanent magnets are usually tile-shaped and located on the outer surface of the rotor core. The important feature of this motor is that the main inductances of the straight and orthogonal axes are equal; the interior permanent magnet is located inside the rotor, and there is a pole piece made of ferromagnetic material between the outer surface of the permanent magnet and the inner circle of the stator core, which can protect the permanent magnet. The important feature of this permanent magnet motor is that the main inductances of the straight and quadrature axes are not equal. Therefore, the performance of these two motors is different.

The motor is excited by rare earth neodymium iron boron permanent magnet materials, and is supplied with permanent magnet special frequency converter. It has the characteristics of large starting torque, wide speed range, compact structure, small size, light weight, low noise, high power factor and high efficiency. It is an ideal power choice for high-efficiency and energy-saving air compressors. The technical requirements and parameters are as follows:

1. The motor can operate normally under the following conditions:

1.1 The ambient temperature does not exceed 40℃;

1.2 Relative humidity ≤90%;

1.3 The altitude does not exceed 1000m.

2. The rated voltage of the motor is 380V, also according to user requirements.

3. The reference work system of the motor: S1.

4. Insulation grade: F grade.

5. Protection level: IP55.

6. Motor structure and installation type: B3, B35.

7. The motor outlet is located on the top of the base, or it can be located on the right or left of the base according to user requirements.

8. Motor service factor: 1.15, 1.2 (or as per technical agreement).