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Rotor of synchronous motor

A technology for synchronous motors and rotors, applied to synchronous machines, synchronous motors with stationary armatures and rotating magnets, electric components, etc., can solve the problems of large IPM inductance and poor controllability, and achieve the goal of reducing cogging torque Effect

Pending Publication Date: 2020-01-21
OKUMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, compared with SPM, the inductance of IPM is larger, and the tracking delay of the current is generated, so the controllability is poor.
Therefore, it is not suitable for servo motors that require high-speed and high-precision positioning operations

Method used

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  • Rotor of synchronous motor
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  • Rotor of synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0038] figure 1 It is an enlarged view of a part of the cross section of the rotor 10 of the synchronous motor in the first embodiment. In addition to the shape of the slit, the rotor 10 of the synchronous motor of the present embodiment and Figure 5 The rotor 50 of the synchronous motor shown has the same structure. That is, when cross-referenced figure 1 and Figure 5 , the rotor 10 has a rotor core 11 (equivalent to Figure 5 51), and a plurality of permanent magnets 13 (equivalent to Figure 5 53). The rotor core 11 includes a plurality of magnet insertion holes 17 (equivalent to Figure 5 57). Each permanent magnet 13 is buried in each magnet insertion hole 17 , and the direction of the magnetic pole is the radial direction of the rotor core 11 . The rotor 10 is connected to a rotating shaft (not shown) at its center. The magnet insertion hole 17 and the slit 12 described later are holes (gaps) opened along the axial direction of the rotation shaft (direction passi...

no. 2 Embodiment approach

[0056] Next, the rotor 10 of the synchronous motor in the second embodiment will be described. figure 2 It is an enlarged view of a part of the cross section of the rotor 10 of the synchronous motor in the second embodiment. In the second embodiment, the adjusted slit 12 b and the adjustment slit 12 c in the first embodiment are integrally provided to form the deformed slit 18 . Since other configurations are the same as those of the first embodiment, descriptions of the same configurations are appropriately omitted.

[0057] Such as figure 2 As shown, a plurality of slits 12 and 18 are formed at intervals in a direction intersecting with the orientation (radial direction) of the magnetic poles of the permanent magnet 13. In addition, as in the first embodiment, in the second embodiment, the intersecting direction is the direction along the side of the permanent magnet 13 (the left-right direction, that is, the first direction). A magnetic circuit 14 is formed between the...

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Abstract

A rotor (10) of a synchronous motor includes a rotor core (11) that includes magnet insertion holes (17) and a plurality of slits (12 (12a, 12b, 12c)) formed on an outer peripheral side of the magnetinsertion holes (17), and permanent magnets (13) embedded in the magnet insertion holes (17). Magnetic-path forming slits (12b, 12b) are formed at intervals in a direction along a side of the permanent magnets (13). Magnetic paths (14) are formed between the magnetic-path forming slits (12a, 12b) and at portions on the outside of the magnetic-path forming slits (12a) on the outermost side. An adjusting slit (12c) is formed between a predetermined magnetic-path forming slit (12b) and the permanent magnet (13) such that a difference between quantities of magnetic flux passing through the magnetic paths (14) adjacent to each other for widths in a direction intersecting an orientation of a magnetic pole of the permanent magnet (13) is small.

Description

technical field [0001] The invention relates to rotors for synchronous electric motors. Background technique [0002] A permanent magnet synchronous motor (Permanent Magnet Synchronous Motor) has a variety of structures, and there is a well-known surface-mounted permanent magnet synchronous motor (hereinafter referred to as "SPM (Surface Permanent Magnet Synchronous Motor)") in which permanent magnets are attached to the outer peripheral surface of the rotor. ), and an interior permanent magnet synchronous motor (hereinafter referred to as "IPM (Interior Permanent Magnet Synchronous Motor)" or "Synchronous Motor (Synchronous Motor)") in which permanent magnets are embedded in the rotor core. [0003] Since the IPM has a structure in which permanent magnets are embedded in the rotor, compared with an SPM in which permanent magnets are attached to the surface of the rotor, there is less risk of the permanent magnets flying away when the rotor rotates at high speed. In additio...

Claims

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Application Information

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IPC IPC(8): H02K1/27H02K21/14
CPCH02K1/274H02K21/14H02K1/276H02K1/02H02K21/022H02K1/223
Inventor 志津达哉横地孝典
Owner OKUMA CORP
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