Permanent-magnet speed-adjustable motor and control method thereof

Abstract

The invention discloses a permanent-magnet speed-adjustable motor which comprises a motor base, wherein an outer rotor assembly and an inner rotor assembly are respectively arranged on the motor baseand at the two ends in the length direction of the motor base through bearings; the outer rotor assembly comprises a first rotating shaft, collecting rings are arranged on the first rotating shaft, abarrel-shaped iron core retainer is arranged at one end in the motor base of the first rotating shaft, an outer rotor iron core and a plurality of induction coils matched with the outer rotor iron cores are arranged in the iron core retainer, the output ends of the induction coils are connected with the collecting rings, the group number of the induction coils is 3N (the N is an integer), the group number of the induction coils is larger than or equal to 6, the number of the collecting rings is 3N, every three groups of induction coils can form a three-phase potential, and N three-phase potentials with the completely same phases can be achieved.

Description

technical field [0001] The invention relates to a permanent magnet speed regulating motor, in particular to a permanent magnet speed regulating motor and a control method thereof. Background technique [0002] The speed-regulating permanent magnetic coupler is more and more recognized by the industry, but in actual use, the speed-regulating permanent magnetic coupler also exposes some problems, mainly including: [0003] 1. The efficiency of the speed-regulating permanent magnetic coupler is low. The speed-regulating permanent magnetic coupler is essentially a slip speed regulation, and its efficiency is positively correlated with the output speed. When the output speed is low, the efficiency is very low. For example, the output speed of the speed-regulating permanent magnetic coupler is 50% of the rated speed. When the speed is high, its working efficiency is only 48%. [0004] 2. The working temperature of the speed-regulating permanent magnetic coupler is high. Since t...

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Problems solved by technology

The speed-regulating permanent magnetic coupler is essentially a slip speed regulation, and its efficiency is positively correlated with the output speed. When the output speed is low, the efficiency is very low. For example, the output speed of the speed-regulating permanent magnetic coupler is 50% of the rated speed. When the speed is high, its working efficiency is only 48%

[0004] 2. The working temperature of the speed-regulating permanent magnetic coupler is high

Since the slip power loss of the speed-regulating permanent magnetic coupler is all converted into heat, the operating temperature of the equipment is high when it works at low speed.

[0005] 3. The reliability of the speed regulating mechanism is not high

The main structure of the speed-regulating permanent magnetic coupler has high reliability, but its speed-regulating mechanism uses mechanical position adjustment to achieve the purpose of speed-regulating, and the speed-regulating mechanism realizes position adjustment under high-speed conditions with low reliability

[0006] 4. Poor control response speed and corresponding precision

Since the speed-regulating permanent magnet coupler realizes speed regulation through the adjustment of the mechanical structure driven by the action of the electric actuator, its corresponding speed is slow and the response accuracy is low.

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