Permanent-magnet self-starting synchronous motor

Abstract

The invention provides a permanent-magnet self-starting synchronous motor which has the advantages that a rotor permanent magnet has simple structure and high permanent-magnet utilization, and a magnetic field formed in the motor has minimum change. The motor comprises a rotor, and rotor teeth and rotor slots are arranged on the circumference of the rotor. The rotor is equally divided into polar areas with the same number of rotor poles by a rotor tooth center line passing through the circle center of the rotor, wherein circular-arc permanent magnets are arranged in each polar area, and permanent magnets in any two adjacent polar areas are arranged symmetrically by a rotor tooth center line at the boundary of the adjacent polar areas. By the circular-arc permanent magnets and rotor iron cores at the bottom of the rotor slots, magnetic separation can be realized without singly building a magnetic separation bridge, and by adjusting the distance between the bottom of the rotor slots and the permanent magnets, magnetic leakage coefficient among poles can be adjusted. The rotor slots not only have the function of magnetic separation, but also have the function of synchronization starting and introducing.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a permanent magnet self-starting synchronous motor. Background technique [0002] IEC60034-3 points out that industrial motors in the world consume 30-40% of the total power generation, and its system optimization energy-saving potential can reach 30-60%. Save 7% of electric energy worldwide, of which 1 / 4 to 1 / 3 of the savings can come from improving the efficiency of the motor. [0003] According to statistics, in 2007, high-efficiency motors sold in China's domestic market accounted for about 1% of the total sales of motors. More than 98% of the motor products are ordinary efficiency motors, which are 3% lower than the efficiency of high-efficiency motors in the United States and 5% lower than the efficiency of ultra-high-efficiency motors; the efficiency of fans, pumps, and compressors is 3-5 percentage points lower than foreign advanced levels; There is a la...

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Problems solved by technology

like Figure 1 to Figure 4 As shown, the rotor of a general permanent magnet self-starting motor usually adopts a straight, V-shaped, U-shaped or W-shaped permanent magnet. The permanent magnet structure used is completely determined by the amount of permanent magnets required in the motor design. The above Various structures need to deal with the relationship between the permanent magnet slot and the rotor slot to meet the strength of the mechanical structure. At the same time, the permanent magnets in the straight, V, U, and W shapes need to be positioned, which requires high processing technology. , otherwise, if the permanent magnet slot space is small, the permanent magnet will not be able to enter squarely; if the permanent magnet slot is too large, the permanent magnet offset will cause the magnetic circuit structure to be asymmetrical and reduce the performance of the motor

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