Winding-dynamically-changeable speed-adjustable permanent magnet synchronous motor and control method thereof

Abstract

The invention discloses a winding-dynamically-changeable speed-adjustable permanent magnet synchronous motor and a control method thereof. Winding connection modes are changed through switches connected with windings, so that a counter electromotive force can be decreased. According to three-phase / double-three-phase conversion, the windings of a double-three-phase motor are connected in series when the motor is at a low speed, so that one three-phase winding is formed; when the motor is at a high speed, two sets of windings of the motor are respectively connected with two inverters. By means of three-phase / double-three-phase conversion, the motor can be set to be two rated points; during three-phase connection, the rated points can be low-speed rated points; when the rotating speed of an ordinary speed-adjustable motor increases gradually, weak magnetic current gradually increases, and as a result, the performance of the motor is reduced; and when the rotating speed of the motor provided by the invention exceeds 2 times of the rotating speed of the low-speed rated points, double three-phase connection is adopted, and a counter electromotive force is reduced to 1 / 2 of an original counter electromotive force, and therefore, weak magnetic current can be effectively reduced, and the efficiency of the motor can be improved, and the operating range of the motor can be extended.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motors, and more specifically relates to a permanent magnet synchronous motor with winding dynamic transformation and speed regulation and a control method thereof. Background technique [0002] my country is rich in rare earth resources. The reserves of rare earth ores are about four times that of other countries in the world. The output of rare earth ores and rare earth permanent magnets ranks among the top in the world. At the same time, my country's research on rare earth materials and rare earth permanent magnet motors has reached the international advanced level. Therefore, giving full play to the advantages of rare earth resources, vigorously researching and promoting the application of various permanent magnet motors represented by rare earth permanent magnet motors has important theoretical significance and practical value for our country. Compared with traditional motors, per...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a permanent magnet synchronous motor with winding dynamic conversion speed regulation and its control method, thereby solving the problem of reducing the field weakening in the existing multi-rated operating point rare earth permanent magnet motor control mode. The current, the number of rated operating points that exist when improving the efficiency of the motor is limited by the coordination of the pole slots, and the span of several rated speeds is large; the winding connection is complicated; the technical problems of many switches required and low reliability

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