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.
在线联系供应商
Other supplier products
 |
Hard-Ferrite Bonded Magnetic Compounds | Ferrite bonded magnetic compounds create a high-cost performancebecause ferrite magnet densityis light and cost is low. Therefore, ferrite compound... |
 |
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... |
 |
Quality Magnetic Products & Solutions | Magnets and magnets assemblies have to meet increasingly complex requirements. Advantage of Bonded Magnetic Compounds As a new type of magnetic ma... |
 |
Magnetic Materials and Their Characteristics | In childhood, magnets were one of our favorite toys. We always played with them and were amazed by their peculiar characteristics. Two magnets alwa... |
 |
Hard-Ferrite Bonded Magnetic Compounds | Compared to rare earth magnetic materials, bonded ferrite magnets have obvious cost advantage due to the use of cheap strontium oxide, barium oxide... |
Same products
 |
Water Bulging Bottle Making Machine | 卖方: Yongkang Hubang Machinery Technology Co., Ltd. | Yongkang Hubang Machinery Technology Co., Ltd. specializes in machinery for thermos and bottle ma... |
 |
High qiality Industry grade Microcrystalline wax for candle | 卖方: Syntop chemical Co.,Ltd. | Industrial microcrystalline wax has a wide range of applications, primarily due to its high melti... |
 |
Automatic Rainbow Lollipop Machine | 卖方: Jiangsu Flying Dragon Food Machinery Co., Ltd. | The Automatic Rainbow Lollipop Machine supports the production of colorful rainbow lollipops with... |
 |
TC SERIES 180-210 HP TRACTOR | 卖方: TIANJIN TRACTOR MANUFACTURING CO., LTD | Our company has long specialized in the development of high-horsepower wheeled tractors. This par... |
 |
TVH2704-3504（Hybrid Tractor） | 卖方: TIANJIN TRACTOR MANUFACTURING CO., LTD | Hybrid tractorsadopt a diesel engine plus motor hybrid drive system. Supported by an intelligent ... |
