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Self-starting permanent magnet motor provided with composite material starting conducting bars

A technology of permanent magnet motors and composite materials, which is applied to magnetic circuits characterized by magnetic materials, synchronous machines, electrical components, etc. It can solve the problem that the rotor cannot use deep grooves or double-layer guide bar structures, and achieve anti-demagnetization The effect of superior ability

Inactive Publication Date: 2011-06-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the self-starting permanent magnet motor, due to the existence of permanent magnets, it is impossible for the rotor to adopt a deep groove or double-layer guide bar structure

Method used

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  • Self-starting permanent magnet motor provided with composite material starting conducting bars
  • Self-starting permanent magnet motor provided with composite material starting conducting bars
  • Self-starting permanent magnet motor provided with composite material starting conducting bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 2 Shown is an enlarged schematic diagram of one magnetic pole of the rotor of a composite material starting bar permanent magnet motor. Each squirrel cage starting bar 1 consists of two materials: brass material and copper-iron alloy material. The brass guide bar 11 has a convex structure and is located in the middle of the bottom and upper part of the rotor slot, and the copper-iron alloy material 12 is located on both sides of the upper part of the rotor slot. The two ends of each squirrel cage starting bar 1 are short-circuited outside the core of the rotor iron 4 through brass end rings welded; in this embodiment, the conductivity of the copper-iron alloy material is 6825.4726S, which is between copper and iron. The height of the brass at the bottom of the rotor slot is 3mm, the height of the upper brass is 16mm, and the width is 2mm.

[0033] Compared figure 1 and 3 It can be seen that the biggest difference between the composite material starting ...

Embodiment 2

[0038] The overall structure of the permanent magnet motor of the composite material starting guide bar of embodiment 2 is the same as that of embodiment 1, the difference is that the structure of brass in the rotor guide bar is different from that of embodiment 1, that is, in figure 2 In the enlarged schematic diagram of one magnetic pole of the rotor of the composite material starting bar permanent magnet motor shown, the middle part of the squirrel cage starting bar 1 is all brass guide bars 11, and the two sides of the guide bar grooves are copper-iron alloy materials 12, so the squirrel cage The processing of starting guide bar 1 is also simpler than that of embodiment 1. In embodiment 2, the width of brass is selected as 2mm. The starting current multiple of the permanent magnet motor in this embodiment is 7.56, the stall torque multiple is 3.2, and the minimum magnetic density at a certain point of the permanent magnet in the starting process is 0.277T, which is obviou...

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Abstract

The invention discloses a self-starting permanent magnet motor provided with composite material starting conducting bars, which belongs to the technical field of permanent magnet motors. A rotor of the permanent magnet motor has a stamping type structure; a permanent magnet is arranged on the inner side of a rotor core, N and S magnetic poles are arranged alternately; a permanent magnet rotor adopts a magnetic pole structure of a U type, V type or mixed type magnetic circuit; composite material rat cage starting conducting bars are uniformly distributed close to the surface of the rotor core; and the composite material rat cage starting conducting bars is made of two types of materials including brass and copper-iron alloy. The brass is positioned on a middle part between the bottom part of a rotor groove and the upper part of the rotor groove; two side parts of the upper part of the rotor groove are made of the copper-iron alloy; or the middle part of the rotor groove is made of the brass, while the two sides of the rotor groove are made of the copper-iron alloy. Two ends of each composite material starting conducting bar are shorted out outside the rotor core through a welded brass end ring. Through the adjustment of the structure sizes of the brass and the copper-iron alloy materials, the obtained permanent magnet motor has a small starting current multiple and strong demagnetization resistance, can be started smoothly, and is suitable for workplaces requiring long-time continuous operation.

Description

technical field [0001] The invention belongs to the technology of permanent magnet motors, in particular to a self-starting permanent magnet motor with composite material starting guide strips. Background technique [0002] AC asynchronous motors are widely used in the industrial field, because asynchronous motors have the advantages of easy manufacture, durability and low price. However, the asynchronous motor needs to provide excitation current by the stator winding, and its power factor is not very high, and the efficiency of the motor is not high due to the existence of rotor copper loss, especially for small and medium-sized asynchronous motors or when the motor is lightly loaded. Compared with asynchronous motors, permanent magnet synchronous motors have permanent magnets on their rotors, which do not require external excitation and can significantly improve the power factor; when the permanent magnet motors are running in a steady state, the rotor has no fundamental w...

Claims

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Application Information

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IPC IPC(8): H02K21/46H02K1/27H02K1/02
Inventor 刘明基卢伟甫宋中阳罗应立张健
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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