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Permanent magnet type rotary electric device rotor

A permanent magnet and rotating motor technology, applied to synchronous motors with stationary armatures and rotating magnets, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve the deterioration of comprehensive operating efficiency, motor loss, etc. problem, achieve the effect of improving manufacturability, improving efficiency, and reducing rare materials

Active Publication Date: 2009-08-05
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in this state, the motor only produces losses, so there is a problem that the overall operating efficiency deteriorates.

Method used

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  • Permanent magnet type rotary electric device rotor
  • Permanent magnet type rotary electric device rotor
  • Permanent magnet type rotary electric device rotor

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Experimental program
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Effect test

no. 1 approach

[0031] use Figure 1 to Figure 5 , the permanent magnet type rotating electrical machine according to the first embodiment of the present invention will be described. figure 1 The structure of the permanent magnet type rotating electrical machine according to the present embodiment is shown, and the rotor 1 is accommodated inside the stator 20 so as to face each other across the air gap 23 . In addition, the stator 20 can employ|adopt the stator of the general structure which can be used as an AC motor. In this embodiment, the Figure 9 The stator 20 of the conventional example shown is the same stator.

[0032]The rotor 1 of the present embodiment includes a rotor core 2 , first permanent magnets 3 having a small product of coercive force and thickness in the magnetization direction, and second permanent magnets 4 having a large product of coercive force and thickness in the magnetization direction. The rotor core 2 is formed by laminating silicon steel sheets, and the fir...

no. 2 approach

[0063] A permanent magnet type rotating electrical machine according to a second embodiment of the present invention is figure 1 The permanent magnet type rotating electrical machine of the first embodiment shown is characterized in that an NdFeB magnet with a small amount of Dy element is used as the second permanent magnet 4 having a large product of coercive force and thickness in the magnetization direction. Therefore, other configurations with figure 1 It is common to the first embodiment shown.

[0064] When the Dy element is small, the residual magnetic flux density of the permanent magnet is high, and at 20° C., a residual magnetic flux density of 1.33 T or higher can be obtained.

[0065] When the conventional rotating electric machine reaches a high speed, in order to suppress a voltage rise due to an induced voltage, flux weakening control is performed by a negative d-axis current. At this time, an excessively large reverse magnetic field acts on the permanent m...

no. 3 approach

[0070] use Figure 6 The configuration diagram of the rotor 1 in FIG. 10 illustrates a permanent magnet type rotating electric machine according to a third embodiment of the present invention. The permanent magnet type rotating electrical machine of the present embodiment consists of Figure 6 The illustrated rotor 1 is constituted by a stator 20 accommodating it. Then, the stator 20 is the same as the other embodiments, figure 1 ,Figure 9 composition shown. In addition, in Figure 6 in, right with figure 1 Components common to the first embodiment shown are denoted by the same reference numerals.

[0071] Such as Figure 6 As shown, in the rotor 1 of this embodiment, the second permanent magnet 4 of an inverted U-shaped NdFeB magnet is embedded in the rotor core 2 so as to protrude toward the outer peripheral side. The central axis of the inverted U-shape of the second permanent magnet 4 is at a position coincident with the d-axis. The first permanent magnet 3 of th...

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Abstract

A rotor of a permanent-magnet-type rotating electrical machine of the present invention has a plurality of magnetic poles in point symmetry with respect to a rotation center of a rotor core 2. For each of the magnetic poles, there are arranged a permanent magnet 3 whose product of a coercive force and a magnetizing direction thickness is small and a permanent magnet 4 whose product of a coercive force and a magnetizing direction thickness is large. The permanent magnet 3 whose product of a coercive force and a magnetizing direction thickness is small is irreversibly magnetized by a magnetic field created by a current of an armature coil 21, to change a total linkage flux amount. This realizes a wide-range variable-speed operation of high output, to provide the rotating electrical machine with a wide operating range and high efficiency.

Description

technical field [0001] This invention relates to a rotor for a permanent magnet type rotating electric machine. Background technique [0002] In general, permanent magnet type rotating electric machines are roughly classified into two types. There are surface magnet type permanent magnet type rotating electrical machines in which permanent magnets are pasted on the outer circumference of the rotor core, and embedded permanent magnet type rotating electrical machines in which permanent magnets are embedded in the rotor core. The latter embedded permanent magnet rotating electrical machine is suitable as a variable speed drive motor. [0003] As the latter embedded permanent magnet rotating electrical machine, "Design and Control of an Embedded Magnet Synchronous Motor", a document published by Yoji Takeda et al., Oum Corporation" (Non-Patent Document 1) is known, and An embedded permanent magnet type rotating electrical machine described in Japanese Unexamined Patent Public...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K19/10H02K1/27H02K21/14
CPCH02K1/2766
Inventor 堺和人新政宪
Owner KK TOSHIBA
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