Rare Earth Permanent Magnet AC Motor China Manufacturer

Advantages:

• This motor has a low torque ripple so it can generate constant torque. Also, its the ability to maintain full torque at low speeds.
• It’s a rotor magnet made by using a permanent magnet so this motor has high efficiency. Because its rotor hasn’t any coil heat generation is less.
• The smaller size and less coil make a high power density. So it makes high speed at a low noise level. The heat transfer is also better, and the cooling system is simple.
• The Permanent magnet synchronous motor doesn't have any brushes so it's easy to install and has a low maintenance cost.
• It has only stator winding and no brushes so its heat generation is low compared with brushed motor.
• It may offer a smaller size for more compact mechanical packages. So permanent magnet motors are highly useful for industrial tasks.
• Don’t need an extra DC power source for it. The AC supply is provided on the stator and the permanent magnets are on the rotor.

Permanent magnet synchronous motors with internal magnets: Maximum energy efficiency

The permanent magnet synchronous motor with internal magnets (IPMSM) is the ideal motor for traction applications where the maximum torque does not occur at maximum speed. This type of motor is used in applications that require high dynamics and overload capacity. It is also the perfect choice if you want to operate fans or pumps in the IE4 and IE5 range. The high purchase costs are usually recouped through energy savings over the run time, provided that you operate it with the right variable frequency drive.

Our motor-mounted variable frequency drives use an integrated control strategy based on MTPA (Maximum Torque per Ampere). This allows you to operate your permanent magnet synchronous motors with maximum energy efficiency. The overload of 200 %, the excellent starting torque, and the extended speed control range also allow you to fully exploit the motor rating. For fast recovery of costs and the most efficient control processes.

Permanent magnet synchronous motors with external magnets for classic servo applications

Permanent magnet synchronous motors with external magnets (SPMSM) are ideal motors when you need high overloads and rapid acceleration, for example in classic servo applications. The elongated design also results in low mass inertia and can be optimally installed. However, one disadvantage of the system consisting of SPMSM and variable frequency drive is the costs associated with it, as expensive plug technology and high-quality encoders are often used.

The reason why the permanent magnet motor can save electricity:

When the three-phase stator windings of the permanent magnet motor (each with a difference of 120° electrical angle) are fed with a three-phase alternating current with a frequency off, a rotating magnetic field that moves at a synchronous speed will be generated.

In the steady state, the main pole magnetic field rotates synchronously with the rotating magnetic field, so the rotor speed is also the synchronous speed, the stator rotating magnetic field and the main pole magnetic field established by the permanent magnet remain relatively static, and they interact and generate electromagnetic torque, The drive motor rotates and performs energy conversion.

The permanent magnet variable frequency air compressor adopts a high-efficiency permanent magnet motor + inverter (PM motor). The screw host and the high-efficiency permanent magnet motor share the same main shaft. The motor has no bearing. , the transmission efficiency is 100%. This structure eliminates the traditional motor bearing failure point and realizes the motor maintenance-free.

The rare earth permanent magnet material has excellent magnetic properties. After magnetization, it can establish a strong permanent magnetic field without additional energy, which is used to replace the electric excitation field of traditional motors. , Reliable operation, small size, and lightweight. It can not only achieve high performance (such as ultra-high efficiency, ultra-high-speed, and ultra-high response speed) unmatched by traditional electric excitation motors but also can be made into special motors that can meet specific operating requirements, such as elevator traction motors, special motors for automobiles, etc.

The combination of rare earth high-efficiency permanent magnet motor with power electronic technology and microcomputer control technology has improved the performance of the motor and transmission system to a new level:

The high-efficiency permanent magnet variable frequency motor always maintains high efficiency under any load, saving more than 38% energy compared with ordinary motors and more than 10% energy saving to induction variable frequency motors.

After the motor is stopped, it can be started immediately, and it can be started and stopped infinitely without affecting the life of the motor. The starting current does not exceed 100% of the full load current.

Because the permanent magnet variable frequency motor has the advantages of low speed and high output torque, its variable frequency control mode is wider than that of the ordinary induction variable frequency motor. The permanent magnet variable frequency motor is 30% smaller in volume and 35% lighter in weight than motors with the same power, and easier to maintain. Therefore, improving the performance and level of the supporting technical equipment is an important development direction for the motor industry to adjust the industrial structure.

At present, the high-efficiency permanent magnet variable frequency motor is the best choice for a screw air compressor drive motor. It is more efficient and energy-saving than an ordinary three-phase asynchronous variable frequency motor!