Starting method of large-capacity permanent magnet synchronous motor based on multi-machine combined structure
A permanent magnet synchronous and combined structure technology, applied in the starting device and other directions, can solve the problem of large starting current, achieve the effect of reducing the starting current, easy to realize, and overcome the impact of large starting current on the power grid
Inactive Publication Date: 2016-03-30
FUZHOU UNIV
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[0007] The purpose of the present invention is to solve the starting problem of a large-capacity permanent magnet synchronous motor. The method of the present invention can effectively overcome the current problems of large starting current and synchronous additional reluctance torque, and has the advantages of simple structure, easy operation and low cost
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[0029] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0030] like figure 1 As shown, the present invention is a method for starting a large-capacity permanent magnet synchronous motor based on a multi-machine combined structure, which is characterized in that: the multi-machine combined structure includes a large-capacity permanent magnet synchronous motor 1, an asynchronous motor 2, a coaxial The rotor 3, the machine base 4 and the casing 5, the large-capacity permanent magnet synchronous motor 1 and the asynchronous motor 2 are connected through the coaxial rotor 3 in the casing 5, and are fixed in the casing 5, and the casing 5 Linked to each other with the base 4, the two are integrated, and the starting method is specifically:
[0031] S01: When starting, apply a full-voltage power supply to the asynchronous motor 2 first, so that the rotor of the asynchronous motor 2 accelerates under...
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The invention relates to a large-capacity permanent-magnet synchronous motor starting method based on a multi-machine combined type structure. The starting method involves applying full-voltage power to an asynchronous motor during starting to enable the rotor of the asynchronous motor to speed up under electromagnetic torque effects. Since a large-capacity permanent-magnet synchronous motor is coaxially connected with the rotor of the asynchronous motor, the rotor of the large-capacity permanent-magnet synchronous motor is driven by the asynchronous motor to speed up synchronously. When the rotating speed of the rotor of the large-capacity permanent-magnet synchronous motor reaches or approaches a rated synchronization rotating speed, the power is switched to the large-capacity permanent-magnet synchronous motor from the asynchronous motor; and when the rotating speed of the rotor of the large-capacity permanent-magnet synchronous motor draws in the synchronization rotating speed, a starting process ends, and on-load operation is put in place. The advantages are as follows: the starting current is substantially reduced, there is no additional magnetic resistance torque in the whole starting process, the cost is low, the structure is simple, and the implementation is easy.
Description
technical field [0001] The invention relates to a method for starting a large-capacity permanent magnet synchronous motor based on a multi-machine combined structure. Background technique [0002] Permanent magnet synchronous motor has significant advantages such as high efficiency (energy saving) and high power factor, but poor starting performance is its unavoidable weakness, and it is also a technical bottleneck that hinders its popularization and application. Usually, for permanent magnet synchronous motors with small capacity (capacity <10kW), asynchronous starting method can be used, that is, a cage-type starting winding is installed on the rotor pole surface, and a three-phase full-voltage power supply is directly applied to the stator winding when starting. Although this method is simple to operate, there is a large starting current and a large additional reluctance torque will be generated during the starting process, which makes the synthetic torque curve obviou...
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IPC IPC(8): H02P6/20
Inventor 王榕生
Owner FUZHOU UNIV