Remanufacturing method for inefficient three-phase asynchronous motor

A three-phase asynchronous motor technology, applied in the manufacture of stator/rotor bodies, etc., can solve the problems of low-efficiency three-phase asynchronous motors and low efficiency of three-phase asynchronous motors, achieve short payback period, low manufacturing cost, and improve reliability Effect

Inactive Publication Date: 2014-04-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is to solve the problem of low efficiency of the existing three-phase asynchronous motor, and now provides a method for remanufacturing the low-efficiency three-phase asynchronous motor

Method used

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  • Remanufacturing method for inefficient three-phase asynchronous motor
  • Remanufacturing method for inefficient three-phase asynchronous motor
  • Remanufacturing method for inefficient three-phase asynchronous motor

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specific Embodiment approach 1

[0019] Specific Embodiment 1: A remanufacturing method of a low-efficiency three-phase asynchronous motor described in this embodiment, the process of the method is: replacing the asynchronous squirrel-cage rotor of the original low-efficiency three-phase asynchronous motor with a built-in permanent magnet rotor.

[0020] In this embodiment, without changing the original low-efficiency three-phase asynchronous motor stator, shaft and end cover, only the original asynchronous squirrel cage rotor is replaced with a built-in permanent magnet rotor, while improving the energy efficiency of the motor , to achieve frequency control and position sensorless operation.

[0021] According to the IEC60034-30 (2008) standard, the energy efficiency level of the motor remanufactured by the present invention reaches IE4 level, which is equivalent to the first level energy efficiency of the national standard GB18613-2012, and the system efficiency can be further improved by frequency conversi...

specific Embodiment approach 2

[0022] Specific implementation mode two: refer to figure 1 Describe this embodiment in detail. This embodiment is a further description of the remanufacturing method of a low-efficiency three-phase asynchronous motor described in the first specific embodiment. In this embodiment, the original low-efficiency three-phase asynchronous motor The winding is star-connected, and each pole of the built-in permanent magnet rotor includes a layer of permanent magnet layer. There is a U-shaped permanent magnet slot on the permanent magnet layer. The permanent magnet is located at the bottom of the permanent magnet slot. The opening of each U-shaped permanent magnet slot corresponds to an eccentric arc; the ratio of the radius of the eccentric arc to the radius of the rotor is between 0.7 and 0.8, and P is the number of poles of the rotor.

[0023] In this embodiment, for low-efficiency three-phase asynchronous motors whose windings are star-connected, a U-shaped rotor structure is adopte...

specific Embodiment approach 3

[0024] Specific implementation mode three: refer to figure 2 Describe this embodiment in detail. This embodiment is a further description of the remanufacturing method of a low-efficiency three-phase asynchronous motor described in the first specific embodiment. In this embodiment, the original low-efficiency three-phase asynchronous motor The winding is star-connected, and each pole of the built-in permanent magnet rotor includes two layers of permanent magnet layers. There are U-shaped permanent magnet slots on the two layers of permanent magnet layers. The permanent magnets are located at the bottom of the permanent magnet slots, and the two layers of permanent magnets are parallel to each other. , the outer wall of the rotor core is composed of P-section eccentric arcs, and the opening of each U-shaped permanent magnet slot in the outer layer corresponds to an eccentric arc; the ratio of the eccentric arc radius to the rotor radius is between 0.7 and 0.8 , P is the number...

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Abstract

The invention relates to a remanufacturing method for an inefficient three-phase asynchronous motor and belongs to the field of motor efficiency enhancing. The remanufacturing method aims at solving the problem of low efficiency of prior three-phase asynchronous motor. According to the remanufacturing method, an asynchronous cage rotor of a prior inefficient three-phase asynchronous motor is replaced by a built-in permanent magnet rotor, that is, the inefficient three-phase asynchronous motor is changed into a built-in permanent-magnet synchronous motor, so that the remanufactured motor energy efficiency level reaches IE4, the remanufactured motor rated load rated load rate is larger than 1.5, and the remanufactured motor no-load opposite electro-dynamic potential total harmonic distortion is smaller than 7%, which is lower than low-speed and medium-high-speed sensorless control. The remanufacturing method is applicable to transformation of inefficient three-phase asynchronous motors.

Description

technical field [0001] The invention belongs to the field of motor energy efficiency improvement. Background technique [0002] According to statistics, the world's total electricity consumption in 2012 was 19.46 trillion kwh, of which more than half was consumed by electric motors. At present, the market for low-efficiency asynchronous motors is huge. Compared with the motor energy efficiency classification standard IEC60034-30 (2008) formulated by the International Electrotechnical Commission (IEC), the efficiency of existing asynchronous motors is generally lower than IE3 or even IE2. In order to improve the energy efficiency of asynchronous motors and achieve energy saving and emission reduction, the current common practice is to replace cast aluminum rotors with cast copper rotors, which can achieve IE3 energy efficiency. However, the process of casting copper rotors is far more complicated than casting aluminum rotors, and the price is expensive, so cast copper rotor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/03
Inventor 徐殿国倪荣刚贵献国王高林
Owner HARBIN INST OF TECH
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