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Permanent Magnet DC Brushless Motor

Permanent Magnet DC Brushless Motor

Permanent Magnet DC Brushless Motor is a kind of DC motor establishing a magnetic field by one or more permanent magnets. The speed can be easily adjusted by changing the armature voltage. It is the main type of low power DC motor, which has the advantages of small volume, high efficiency, simple structure and less copper consumption. Permanent Magnet DC Brushless Motor is composed of motor body and driver, which is a typical mechatronic product.

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Permanent Magnet DC Brushless Motor is a kind of DC motor establishing a magnetic field by one or more permanent magnets. The speed can be easily adjusted by changing the armature voltage. It is the main type of low power DC motor, which has the advantages of small volume, high efficiency, simple structure and less copper consumption. Permanent Magnet DC Brushless Motor is composed of motor body and driver, which is a typical mechatronic product. 

According to by using different permanent magnet materials, Permanent Magnet DC Brushless Motor can be divided into AlNiCo permanent magnet DC motor, ferrite permanent magnet DC motor and rare earth permanent magnet DC motor. AlNiCo permanent magnet DC motor needs to consume a lot of precious metals, which costs too much. But on the other side, it has good adaptability to high temperatures, which is the best choice for high ambient temperatures or High demand Motor temperature stability occassions. Ferrite permanent magnet brushless DC motors are known for their low cost and good performance. And they are widely used in household appliances, automobiles, toys, power tools and other fields.  A rare earth permanent magnet brushless DC motor has small volume and better performance, but it is expensive. So it is mainly used in aerospace, computer, downhole equipment field.

Notes:

1. Generally, the permanent magnet DC motor is not allowed to reverse the braking operation under the rated voltage, otherwise the permanent magnet will be demagnetized; if it is necessary to operate in this way, If it is necessary to run this way, pls add a current limiting resistor to limit the current too large.

2.Pay attention to the demagnetization of the permanent magnet caused by excessive current, temperature change and magnetic circuit opening during disassembly and assembly.Especially for the AlNiCo permanent magnet motor, magnetic short circuit protection should be carried out during disassembly and assembly, otherwise it should be magnetizied after demagnetization.

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