Method of weakening cogging torque of permanent magnet synchronous motor
A technology of permanent magnet synchronous motor and cogging torque, which is applied in the direction of synchronous machine parts, magnetic circuit rotating parts, magnetic circuit, etc., which can solve the problems of difficult equipment manufacturing, complicated methods, and increased design costs
Inactive Publication Date: 2016-10-26
SHANGHAI DIANJI UNIV
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Problems solved by technology
Due to the characteristics of the number of poles and the number of slots of the direct-drive wind turbine, it is not only extremely complicated and difficult to calculate when it is used, but also increases the design cost, and it is also quite difficult to manufacture the equipment.
Subsequently, some scholars proposed a magnetic pole offset method based on repeating units, but this method is still too complicated for fractional slots
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[0027] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with illustrations and specific embodiments.
[0028] As shown in Figure 2(b), the permanent magnet synchronous motor used in wind turbines has 30 poles and 45 slots, and the motor poles are evenly distributed on the rotor yoke surface of the upper disk. A group of 5 adjacent magnetic poles is selected, and it can be calculated from the formula (2) given above that each group of magnetic poles should be shifted by 4 mechanical angles. The results of its use are as image 3 and Figure 4 shown.
[0029] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-men...
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The invention discloses a method of weakening cogging torque of a permanent magnet synchronous motor. Motor magnetic poles are distributed on the surface of an upper disc rotor magnetic yoke; the motor magnetic poles are divided into a plurality of groups along the rotor circumference direction; each group comprises a plurality of adjacent magnetic poles, except the first in the group, the rest magnetic poles have different mechanical offset angles pointing to the first magnetic pole. Through two steps of determining the cogging torque of the motor and the magnetic pole offset angles, each sub harmonic is weakened, the number of poles of the motor is not limited, whether the motor is provided with a fractional slot or an integral slot does not need to be distinguished, and practical engineering applications to a permanent-magnet direct-drive wind power generator can be guided.
Description
technical field [0001] The invention relates to the field of permanent magnet synchronous motors, in particular to a method for weakening the cogging torque of permanent magnet synchronous motors used in small and medium-sized wind power generating sets. Background technique [0002] In small and medium-sized wind turbines, the proportion of permanent magnet wind turbines is increasing. The cogging torque directly affects the starting and low-speed running performance of the generator. In the operation of the permanent magnet motor, the cogging torque will cause the pulsation and noise of the output torque, especially for the low-speed operation of the motor, and it is also an important factor affecting the control accuracy of the system. The current method of weakening the cogging torque of the motor There are mainly slot-pole fit method, chute, oblique pole, magnetic pole offset, auxiliary slot, pole arc coefficient method, optimized permanent magnet shape, etc. These me...
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Login to View More IPC IPC(8): H02K21/02H02K1/27
CPCH02K21/02H02K1/2706
Inventor 陈亚新徐余法房建俊罗玉东
Owner SHANGHAI DIANJI UNIV