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Something about Interior Permanent Magnet Electric Motor
According to the attachment mode of magnet and rotor and rotor design, permanent magnet synchronous motors can be divided into two categories:
• Surface Permanent magnet synchronous Motor (SPMSM)
• Interior Permanent Magnet Synchronous Motor (IPMSM)
This essay are designed to give an introduction about interior permanent magnet synchronous motor from several perspectives as follows:
• What is interior permanent magnet synchronous motor?
• The features of interior permanent magnet synchronous motor
• How does interior permanent magnet synchronous motor work?
What is interior permanent magnet synchronous motor?
Interior permanent magnet motor is a kind of motor using permanent magnet material as a magnetic field source. Its magnetic field is generated by magnets made of permanent magnet material, which are mounted on the stator of the motor, usually in a circar shape. When the motor is energized, the current in the stator generates a magnetic field that interacts with the magnetic field of the permanent magnet, resulting in torque that drives the motor to rotate.
The features of interior permanent magnet synchronous motor
Interior permanent magnet motor features include:
• Large torque:The interior permanent magnet motor can produce a large torque at a lower speed, making it suitable for applications requiring high torque, such as cranes and electric vehicles.
• High efficiency: The power factor of the interiorpermanent magnet motor can reach more than 95% under full load, and the efficient permanent magnet variable frequency motor always maintains a high efficiency of about 90% under any load. This makes the interior permanent magnet motor a significant advantage in terms of energy saving.
• No reactive power loss:there is no reactive power loss when the permanent magnet motor is running, which better improves the overall efficiency of the motor.
• Simple structure and reliable operation:the interior permanent magnet motor cancels the excitation winding, the structure is relatively simple, and the risk of failure is low during operation, which makes it have high operational reliability.
Fast response:Due to the high magnetic properties of the interior permanent magnet motor, it has good dynamic response characteristics, which is suitable for occasions with high operating stability requirements.
How does interior permanent magnet synchronous motor work?
Specifically, the operation process of the interior permanent magnet motor can be divided into the following steps:
• The stator winding is energized: When the motor is energized, the current in the stator winding will produce a magnetic field.
• Rotor rotation: The permanent magnet on the rotor interacts with the stator magnetic field to generate torque and drive the rotor to rotate.
• Speed control: By controlling the frequency of the stator winding input current, the magnetic field rotation frequency can be controlled, and then the speed can be controlled.
• Output torque: The interiorpermanent magnet motor can produce a large torque at a lower speed, making it suitable for applications requiring high torque.
In short, the interior permanent magnet motor generates a magnetic field through the stator winding, which interacts with the permanent magnet field on the rotor, thereby generating torque and driving the motor to rotate. It has the characteristics of small size, light weight, high efficiency, fast response, etc.
