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Synchronous reluctance motor

A synchronous reluctance and motor technology, applied in the direction of synchronous machine, magnetic circuit, magnetic circuit rotating parts, etc., can solve the problem of increased torque ripple, achieve the effect of suppressing the increase of torque ripple and high output torque

Active Publication Date: 2021-11-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synchronous reluctance motor has a technical problem in that the output torque is not as good as that of the permanent magnet synchronous motor in which magnets are embedded in the rotor, and the torque ripple increases due to the sharp change in the magnetic permeability near the gap.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0062] figure 1 It is a configuration diagram showing a system using the synchronous reluctance motor 1 according to Embodiment 1 of the present invention. exist figure 1 Among them, the synchronous reluctance motor 1 is an electrical device connected to a control device 3 via a power supply line 2 and converts electric energy supplied from the control device 3 into mechanical energy.

[0063] figure 2 It is a cross-sectional view of the synchronous reluctance motor 1 according to Embodiment 1 cut along the axial direction of the shaft 4 . figure 2 The dashed line B shown is the axis of the axis 4 . exist figure 2 Among them, the annular stator 6 and the cylindrical rotor 7, which are inserted and fixed to the frame 5 by press fit or shrink fit, are relatively rotatable with a mechanical gap (magnetic gap) interposed by a bearing 8. mode is configured.

[0064] The stator 6 is configured by applying a winding 10 to an annular stator core 9 including an iron core. A r...

Embodiment approach 2

[0099] In Embodiment 2 for carrying out the present invention, in order to achieve higher output torque and lower torque ripple, a preferable arc shape constituting the slit 15 will be described.

[0100] Figure 16 It is an explanatory diagram showing the cross section of the rotor 7 of the synchronous reluctance motor 1 with 6 poles and 36 slots according to the second embodiment and showing the definition of the dimensions of the arc. In Embodiment 1, the slot width 21 that is the opening width in the short side direction of each slot 15 and the core width 22 that is the width of the portion of the rotor core 11 sandwiched between the slots 15 are uniform. The effect of the arrangement interval θ of the slits 15 was described, and in the second embodiment, the influence of the arc shape, that is, the convex shape of the slits 15 and the slit width 21 on the output torque and torque ripple will be described.

[0101] In order to obtain the effects of high output torque and ...

Embodiment approach 3

[0146] The synchronous reluctance motor 1 according to Embodiment 3 of the present invention is characterized in that notches 31 are provided on the outer peripheral surface of the rotor core 11 .

[0147] Figure 28 It is a sectional view showing the rotor 7 of the synchronous reluctance motor 1 according to the third embodiment. In the synchronous reluctance motor 1 according to Embodiment 3, notches 31 are provided on the outer peripheral surface of the rotor core 11 intersecting the q-axis. For example, if Figure 28 The groove-shaped notches 31 are arranged in that way. Since the disposition of the notch 31 is the disposition of the non-magnetic body portion on the q-axis, the same effect as that of the disposition of the slit 15 is achieved. That is, since the q-axis inductance decreases due to the notch 31, the output torque increases.

[0148] Next, the effect of providing the notch 31 on the torque ripple will be described. For example, when the angle θs formed b...

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Abstract

The present invention obtains a synchronous reluctance motor in which a high output torque and a low torque ripple can be obtained simultaneously. The synchronous reluctance motor is provided with: an annular stator core 9 formed with S slots 14 arranged at equal intervals along the inner circumferential surface; and a cylindrical rotor core 11 provided on the inner surface side of the stator core 9 and provided with a plurality of slits comprising arc-shaped opening portions which project toward the cylinder center on a per magnetic pole basis and have the respective apexes positioned on the q-axis. The n-th arc of the inner edges of the opening portions near the cylinder center has the arc center point at a position having a distance D (n) from the outer circumferential surface of the rotor core along the q-axis and, when the radius of the n-th arc with respect to the arc center point is denoted by R(n), is specified by ratio k(n) = D(n) / R(n). The values of the ratios k(1) to k(n) are determined so as to satisfy 0.20 <= k(nmax) <= 0.37, k(nmax) < ... < k(n) < ... < k(1) < 1, and (-0.92 / nmax) <= a <= (-0.71 / nmax), where a is a slope.

Description

technical field [0001] The present invention relates to a synchronous reluctance motor utilizing reluctance torque. Background technique [0002] Synchronous reluctance motors are used in railway vehicles, air conditioners, automobiles, and the like. The synchronous reluctance motor generates magnetic saliency by providing a slit in the rotor, and rotates using the reluctance torque generated by the magnetic saliency. However, the synchronous reluctance motor has a technical problem in that the output torque is not as good as that of the permanent magnet synchronous motor in which magnets are embedded in the rotor, and the torque ripple increases due to a sharp change in magnetic permeability near the gap. [0003] In order to increase the output torque of the synchronous reluctance motor, it is necessary to increase the number of gaps provided in the rotor and increase the salient pole ratio of the motor. Furthermore, since the torque ripple is dominated by the component ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/22
CPCH02K2213/03H02K1/246H02K19/103
Inventor 枦山盛幸茅野慎介
Owner MITSUBISHI ELECTRIC CORP