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permanent magnet synchronous motor

A permanent magnet synchronous and motor technology, applied in the direction of motors, electric vehicles, magnetic circuit rotating parts, etc., can solve the problem of reducing efficiency and achieve the effect of reducing copper loss

Active Publication Date: 2016-08-17
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with the permanent magnet synchronous motor using neodymium magnets of the same size, there is a problem that the efficiency of the permanent magnet synchronous motor using ferrite magnets is greatly reduced.

Method used

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Embodiment Construction

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments, and various modifications and application examples are included within the scope of the technical concept of the present invention.

[0027] In addition, in the embodiments described below, a ferrite magnet is used as an example of a permanent magnet, but the present invention assumes the use of a magnet with a residual magnetic flux density of about 0.3T to 0.5T, and the representative is a ferrite magnet. .

[0028] figure 1 A longitudinal sectional view of a stator constituting a permanent magnet synchronous motor is shown in the middle. In addition, in figure 1 The representation of the winding wire (winding wire) is omitted in . The stator 10A is composed of: a core body 12A made of a magnetic material; a plurality of slots 14A for storing winding wires formed on the inner peripheral ...

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Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor capable of effectively reducing copper loss assuming that a magnet having a residual magnetic flux density of 0.3 T to 0.5 T, preferably a ferrite magnet is used.SOLUTION: A residual magnetic flux density of a permanent magnet embedded in a rotor is set within a range of 0.3 T to 0.5 T, and a ratio St1 / St2 between an inner diameter (diameter) St1 and an outer diameter (diameter) St2 of a stator housed in the rotor is set within a range of 0.53 to 0.69. Copper loss of a permanent magnet synchronous motor using the permanent magnet whose residual magnetic flux density is within the range of 0.3 T to 0.5 T is effectively reduced to achieve high efficiency of the permanent magnet synchronous motor.

Description

technical field [0001] The present invention relates to a permanent magnet synchronous motor, and more particularly to a permanent magnet synchronous motor of an embedded structure in which a permanent magnet is embedded in a rotor core. Background technique [0002] In general, permanent magnet synchronous motors are widely used as electric motors used in the automotive field such as electric cars and hybrid cars, and in the field of home appliances such as air conditioners, refrigerators, and water heaters using heat pumps. This permanent magnet synchronous motor is a synchronous motor using permanent magnets for a magnetic field (magnetic pole) of a rotor. [0003] Furthermore, among such permanent magnet synchronous motors, an embedded permanent magnet synchronous motor (Interior Permanent Magnet Synchronous Motor) in which a permanent magnet is embedded in a rotor core is widely used. This embedded structure type permanent magnet synchronous motor uses a rotor in which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27
CPCY02T10/64
Inventor 丸山惠理高桥晓史
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC