Permanent Magnet Materials Are Used in Motors

• 

Permanent magnets are widely used in our lives. Many people are curious about what are made out of permanent magnets? Most permanent magnets are used in the manufacture of various types of permanent magnet motors, the large ones are exciters, auxiliary exciters, generators in airplanes; the small ones are floppy and hard drive motors used in computers, printing motors, VCD and DVD CD motors, bicycle motors and car motors, hundreds of millions of toy motors and so on. These are all the examples of permanent magnets in everyday life.

The earliest invented motor used permanent magnets to provide magnetic flux to the air gap between the rotor and the stator. At that time, the energy density of permanent magnet materials was very small, and the power (output) of the motor was too small to meet the requirements, so people turned to current to generate magnetic flux. The torque of a motor is proportional to the current and also proportional to the magnetic flux. The power of the motor is equal to the product of the torque and the speed. Using current to generate magnetic flux consumes more electrical energy, while using permanent magnets to provide magnetic flux can save electrical energy. Therefore, with the progress of permanent magnet materials, there are more and more permanent magnet motors. Recently, with increasing calls for environmental protection and energy conservation, some countries have been researching and developing permanent magnet motors for electric vehicles to replace ordinary motors below 500kW.

The permanent magnets used in permanent magnet motors are mainly sintered and injection molded. In order to reduce weight and improve efficiency, small and micro motors with lower power generally choose injection molded permanent magnets. Injection molded ferrites are also easy to shape design to meet Motor use requirements.

During the operation of the motor, the permanent magnet is periodically subjected to the demagnetizing field; at the same time, the energy loss of each part of the motor eventually becomes heat, which makes the temperature of the motor reach a high temperature when it reaches a thermal equilibrium. Therefore, the permanent magnet material used in the motor must have a high intrinsic coercivity and critical magnetic field.

During the operation of the motor, the centrifugal force received by the permanent magnet is very large. Centrifugal force is tensile stress, and the tensile strength of permanent magnet materials is not high. In this regard, people have made efforts in two aspects:

(1) The compressive stress on the permanent magnet is greater than the tensile stress in the motor structure;

(2) The tensile strength of the injection molded permanent magnet is greater than that of the sintered permanent magnet, and many motors adopt it.

If you want to know different types of magnets and their propertiesor more, contact us.

Other supplier products

	Permanent Magnet Materials Are Used in Motors	Permanent magnets are widely used in our lives. Many people are curious about what are made out of permanent magnets? Most permanent magnets are us...
	Hard-Ferrite Bonded Magnetic Compounds	Light density and low cost of ferrite bonded magnetic compounds (hard ferrite magnets) create a high-cost performance. Therefore, it has the larges...
	Bonded Neodymium Magnetic Compounds	Bonded NeodymiumMagnetic Compounds Introductions Bonded neodymium magnet (bonded NdFeBmagnet) has high mechanical performance and no need for surfa...
	Hybrid Bonded Magnetic Compounds	Hybrid Bonded Magnetic Compounds Introductions： By mixing different kinds of magnetic powder in different proportions, we can obtain a series of Hy...
	High-Density Compounds	High-density plastic has a density of up to 13g/cm3 by adding high-density powder to the plastic matrix, which is higher than that of ordinary meta...

Same products

	Mechanic iTough X Tough Superfine Cutting Wire For LCD OLED Screen	Seller: Shenzhen PHONEFIX technology Co.,Ltd	Mechanic iTough X tough cutting wire suitable for LCD/OLED screen separation, Mechanic high hardn...
	Barbed Skullcap Herb	Seller: Hangzhou Botanical Technology Co., Ltd.	The quality and effect of plants could be various due to different environments which they live i...
	Mint Leaf	Seller: Hangzhou Botanical Technology Co., Ltd.	Mint leaves, scientifically known as Mentha, belong to a diverse genus of aromatic herbs from the...
	Arborvitae Leaf and Twig	Seller: Hangzhou Botanical Technology Co., Ltd.	Arborvitae, scientifically known as Thuja occidentalis, is a type of evergreen tree native to Nor...
	Plantain Herb	Seller: Hangzhou Botanical Technology Co., Ltd.	Plantain herb, scientifically known as Plantago major, is a versatile and widely distributed medi...