Permanent magnet motor and its characteristics
- Time of issue:2021-10-20
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Permanent magnet motor and its characteristics
The maximum power of the permanent magnet motor has reached 1000kW, the minimum diameter
φ0.8mm, the highest speed is 300000r/min, and the lowest speed is 0.01r/min. Compared with electric excitation motors, permanent magnet motors have the following characteristics.
2.1 Simple structure, high reliability
With permanent magnet materials for excitation, the pole shoes and excitation coils used in the original electric excitation motor can be replaced by one or more permanent magnets, and the parts are greatly reduced, and the structure is greatly simplified. At the same time, because the collector ring and brushes for excitation are omitted, not only the manufacturability of the motor is improved, but the mechanical reliability of the motor operation is greatly enhanced, and the service life is increased.
2.2 Excellent performance
For permanent magnet motors, especially those using rare earth permanent magnet materials, the air gap flux density can be greatly improved, and the motor index can achieve the best design. The direct effect is that the motor volume is reduced and the weight is reduced. Not only that, compared with other motors, permanent magnet motors also have very excellent control performance. This is because: First, due to the high performance of rare earth permanent magnet materials, the torque constant, torque inertia ratio, and power density of the motor are greatly improved. Through reasonable design, indexes such as moment of inertia, electrical and mechanical time constants can be greatly reduced, as the main indexes of servo control performance have been greatly improved. Second, in modern permanent magnet motors, the design of the permanent magnet circuit has been relatively complete. In addition to the high coercivity of the powerful magnet rare earth permanent magnet materials, the anti-armature reaction and other demagnetization capabilities of the permanent magnet motor are greatly enhanced. , The control parameters of the motor are greatly reduced with the influence of external disturbances. Third, because the permanent magnet material replaces the electric excitation, the design of the excitation winding and the excitation magnetic field is reduced, thereby reducing the excitation flux, the excitation winding inductance, the excitation current and many other parameters, thereby directly reducing the controllable variables or parameters. Based on the above factors, it can be said that the permanent magnet motor has excellent controllability.
For example, the current all-digital permanent magnet AC servo motor has excellent speed regulation performance, and the speed regulation ratio of the sine wave AC servo motor can reach up to 1:100,000. After stepping motors and low-speed synchronous motors adopt permanent magnet materials, their output torque and dynamic response characteristics have been significantly improved and improved. Therefore, compared with motors of the same specification, the dynamic performance indicators, steady-state performance indicators, control performance indicators and reliability indicators of permanent magnet motors are greatly improved than ordinary motors.
2.3 High efficiency and energy saving
Permanent magnet motors can not only reduce the resistance loss, but also effectively improve the power factor. For example, the permanent magnet synchronous motor can maintain high efficiency and power factor within the range of 25% to 120% of the rated load. 300W Micro Motor Special Issue No. 7, 2006 The miniature permanent magnet DC motor within 16 is 10% ~ 20% more efficient than the electric excitation motor of the same specification. After a large number of fans and pump load motors are changed to permanent magnet motors, the comprehensive energy-saving effect is very significant. The greater the power, the greater the proportion of the excitation loss to the total loss, so the higher efficiency of the permanent magnet motor is more prominent.
relevant information
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What kind of strong magnet is of good quality?At present, the sales competition of powerful magnets in the market is becoming more and more intense. In order to obtain a better competitive advantage in the market, many magnet manufacturers will use inferior raw materials to reduce costs. Therefore, when buying a strong magnet, we must know how to distinguish the quality of the strong magnet, so that we can buy a relatively high-quality strong magnet. - Permanent magnet motor and its characteristics 2021-10-20
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