Permanent magnet synchronous linear motor

A permanent magnet and linear motor technology, applied in electrical components, electromechanical devices, propulsion systems, etc., can solve problems such as pitch staggering, low effect of reducing high-order components, and reducing the effect of cogging effect

Inactive Publication Date: 2006-07-19
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although there is a large reduction effect on primary components, when the cogging waveform contains secondary components or high-order components, the reduction effect on high-order components is extremely small, so that it may not be possible to reduce the cogging effect.
[0011] In addition, due to the influence of the groove shape between the teeth of the armature, the effect of reducing the cogging effect will become the maximum pitch between the auxiliary teeth, which may also be deviated from the pitch specified by the above-mentioned conventional technology.

Method used

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  • Permanent magnet synchronous linear motor
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Experimental program
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Effect test

Embodiment 1

[0030] figure 1 It shows the permanent magnet type synchronous linear motor of the embodiment of the present invention. In order to illustrate the relationship between the main gear and the auxiliary gear of the embodiment 1-3, it is a side cross-sectional view of the common linear motor.

[0031] If the present invention and conventional components are the same, the same reference numerals will be used to omit the description, and only the differences will be described. Furthermore, this linear motor is an example showing the same 8 magnetic poles as in the prior art, and the gaps of 9 slots are opposed to each other.

[0032] figure 1 Among them, 3 is the armature, 4 is the armature core, 4a is the slot, 4b is the main tooth, 4c is the yoke, 5 is the armature coil, and 6 is the auxiliary tooth.

[0033]In this embodiment, the linear motor includes: a stator composed of permanent magnets 2 to be field poles, and a stator with slots 4a and main teeth 4b, and with auxiliary tee...

Embodiment 2

[0050] Next, use figure 1 To illustrate the second embodiment.

[0051] That is, the distance τ between the centers of the auxiliary teeth 6 P And field pole pitch τ m The relationship is made into τ P ≠(2n-1)×τ m Under the condition of / 2 (n is a positive integer), assume that the length of the auxiliary tooth 6 in the orthogonal direction along the permanent magnet 2 is Hd, and the main tooth 4b is in the orthogonal direction along the permanent magnet 2 When the length of is Ht, the length of the auxiliary tooth 6 is set to be in the range of 0≤Hd≤Ht.

[0052] In the above configuration, the ratio Hd / Ht between the length Hd of the auxiliary tooth 6 and the length Ht of the main tooth 4b is set to be 0.50≦Hd / Ht≦1.

[0053] In the second embodiment, when the relationship between the length Ht of the main tooth 4b and the length Hd of the auxiliary tooth 6 is set as described above, as in the first embodiment, the cogging force can be reduced to substantially zero, and high-perf...

Embodiment 3

[0055] Next, use figure 1 To illustrate the third embodiment.

[0056] As explained in the prior art, the cogging waveform of a linear motor contains high-order components other than the primary component and higher than the secondary component for the magnetic pole pitch. The smaller the frequency, the larger the amplitude. For this reason, in order to reduce the cogging effect, it is mainly necessary to reduce the primary and secondary components.

[0057] Next, the effect of reducing the primary component or the secondary component by the auxiliary teeth 6 will be described. First, the relationship between the distance between the centers of the auxiliary teeth 6 and the cogging effect will be explained.

[0058] To reduce the primary component, as shown in Japanese Patent Publication No. 7-053427, the distance between the centers of the auxiliary teeth 6 is made τ P =(2n-1)×τ m / 2 is fine.

[0059] The distance between the centers of the auxiliary teeth 6 to cancel the second...

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Abstract

The invention provides a permanent magnet synchronous linear motor comprising a field yoke (1) having a plurality of permanent magnets (2) the polarity of which is alternated and which are arranged linearly and an armature (3) facing the array of the permanent magnets (2) through a magnetic air gap, wherein the armature (3) comprises an armature core (4) having main tees (4b) and slots (4a), an armature winding (5) wound in the slots 4a of the armature core (4), and auxiliary teeth (6) provided at both the ends of the armature core (4). The distance tau P between the centers of the auxiliary teeth (6) and the pitch tau m of the field poles satisfy a relation tau P = (2n-1) x tau m / 2 (n is a positive integer) and the length of the auxiliary teeth (6) is in a relation of O < Hd < Ht where Hd is the length of the auxiliary teeth (6) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth (4b) in the direction orthogonal to the array of permanent magnets. Thus a high performance permanent magnet synchronous linear motor having reduced cogging thrust can be provided.

Description

Technical field [0001] The present invention relates to a permanent magnet type synchronous linear motor with small cogging force and high performance. Background technique [0002] Traditionally (in the past), it has been used in the conveying mechanism of machine tools or the positioning device of semiconductor manufacturing equipment. It also has permanent magnets that constitute the magnetic poles of the field, and oppose the magnetic pole faces of the permanent magnetic field through the gap, and the armature The permanent magnet type synchronous linear motor (motor) of the armature formed by winding the coil in the slot of the armature core is well known. [0003] When the armature coil of the linear motor constructed in this way is not energized, when the armature is moved in the direction of the long axis of the magnet row of the permanent magnet by the electromagnetic action of the permanent magnet, the two ends of the armature core The end effect produces cogging thrust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K41/03
CPCH02K41/031H02K41/03
Inventor 大户基道田边政彦宫本恭祐猪口博文
Owner YASKAWA DENKI KK
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