What magnets is the rotor inside the servo motor?

Servo motor rotor magnet is an important part of the servo motor, it can convert electrical energy into mechanical energy, and drive the operation of mechanical equipment, the quality of the magnet and the manufacturing process directly affects the performance and life of the motor, this article will introduce the type of servo motor rotor magnet.

Types of rotor magnets inside a servo motor;

The rotor inside a servo motor is usually made of permanent magnets. Permanent magnets are magnets whose magnetic poles and field strength are permanently unchanged. In modern servo motors, the most common permanent magnet material is neodymium iron boron (NdFeB). This is a high-strength permanent magnet material with very high remanent magnetization and coercivity. There are two types of NdFeB magnets, sintered and bonded, of which sintered NdFeB magnets are widely used in high-performance servo motors because of their excellent magnetic properties.

Curved neodymium magnets for servo motor internal rotors

The main reason for choosing NdFeB permanent magnets as rotors for servo motors;

The main reason is that neodymium magnets have the advantages of high magnetic energy product, high residual magnetic induction strength, high torque density, high efficiency and compact structure.

Here is some more knowledge about servo motor magnets;

1, Servo motor rotor magnets need to be glued?

Servo motor rotor magnets must be glued, there are many types of glue, such as KR high-temperature resistant series of glue, AB glue and so on.

2, Servo motor rotor why not use electromagnets instead of permanent magnets?

This is a netizen is such a reply, electricity to money, and limited current and limited space, can produce a magnetic field is not necessarily stronger than permanent magnets.

3, Servo motor of the hard disk head what magnet is used?

The servo motor of the hard disk head is a voice coil motor, the same as the usual permanent magnet synchronous motor, the magnet material is rare earth permanent magnet NdFeB.

The U/V/W three-phase electricity controlled by the servo drive forms an electromagnetic field, and the rotor rotates under the action of this magnetic field. At the same time, the encoder that comes with the motor feeds back signals to the drive, which adjusts the angle of rotation of the rotor according to the comparison between the feedback value and the target value, and the servo motor's precision is determined by the precision of the encoder (number of lines).

PS: Avoid oil and water when the servo motor is working, the servo motor is not a fully waterproof device, it should not be placed in water or oil-infested environment. When connected to a reduction gear, the user should take care to prevent oil from the reduction gear from entering the motor, and take care that the cable comes into contact with oil and water.

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