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Rotating electrical machine

A technology for rotating electrical machines and rotors, applied in the field of rotor core structure, can solve problems such as torque drop, enlargement of the distance between magnets and magnetic gaps, and difficulty in realizing magnetic force enhancement, and achieves reduction of q-axis inductance, improvement of high-speed rotation characteristics, and the effect of clear effect

Pending Publication Date: 2021-06-25
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, since the outer peripheral surface of the rotor core is made into a petal structure, there is a technical problem that the distance between the magnet and the magnetic gap increases and the torque decreases.
In addition, in Patent Document 1, the circumferential width of the magnet is limited by the depth of the concave portion between the poles, and it is difficult to further strengthen the magnetic force.

Method used

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  • Rotating electrical machine
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Embodiment approach 1

[0044] Hereinafter, the rotating electrical machine in Embodiment 1 will be described based on the drawings. figure 1 is a block diagram of a vehicle electric power steering device equipped with an electric motor in Embodiment 1, figure 2 yes means figure 1 A sectional view of the electric drive unit of the electric power steering shown, image 3 with Figure 4 It is a cross-sectional view and a partially enlarged cross-sectional view showing the rotating electrical machine in Embodiment 1. FIG. In addition, in each figure, the same code|symbol is attached|subjected to the same, corresponding part in a figure.

[0045] Such as figure 1 As shown, an electric drive device 50 of an electric power steering apparatus includes an ECU (Engine Control Unit) 30 and an electric motor 40 as a rotating electric machine in the first embodiment. The electric motor 40 is arranged in parallel with the casing 34 of the electric power steering device. The ECU 30 has a first connector 31 ...

Embodiment approach 2

[0069] Figure 9 with Figure 10 It is a cross-sectional view and a partially enlarged cross-sectional view showing the rotating electric machine in Embodiment 2, Figure 11 with Figure 12 It is a cross-sectional view and a partially enlarged cross-sectional view showing a modified example of the rotating electric machine in Embodiment 2. FIG. The outer peripheral surface of the interpole bridge 27 of the rotor core 22 of the rotary electric machine according to Embodiment 1 is formed of one plane, but the outer peripheral surface of the interpole bridge 27A of the rotary electric machine according to Embodiment 2 is formed of two flat surfaces. In addition, other configurations of the rotary electric machine in Embodiment 2 are almost the same as those in Embodiment 1 described above, and thus description thereof will be omitted.

[0070]The outer peripheral portion of rotor core 22 in Embodiment 2 has arcuate petals 26 arranged corresponding to the respective magnetic po...

Embodiment approach 3

[0076] Figure 13 with Figure 14 It is a cross-sectional view and a partially enlarged cross-sectional view showing a rotating electrical machine in Embodiment 3. FIG. The rotating electric machine in Embodiment 3 is a rotating electric machine in which the circumferential width W1 of the petal portion 26 of the rotor core 22 is smaller than the circumferential width W2 of the permanent magnet 23 (W1<W2). In addition, other configurations of the rotating electric machine in Embodiment 3 are almost the same as those in Embodiment 1 or Embodiment 2 described above, and thus description thereof will be omitted.

[0077] The petal portion 26 of the rotor core 22 in the third embodiment has a diameter larger than that of the petal portion 26 in the first embodiment (see Figure 4 ) is arc-shaped with a small diameter. In addition, in Figure 14 In the figure, a dotted line L4 represents a part of the outer shape of the petal portion 26 in the first embodiment described above. ...

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Abstract

A rotor core (22) of this rotating electrical machine comprises petal parts (26) that are arranged in a manner corresponding to respective magnetic poles, an interpolar bridge (27) arranged more to an outer peripheral side than a permanent magnet (23) in a non-magnetic part between poles, and an interpolar radius bridge (28) surrounded by two permanent magnets (23) and the interpolar bridge (27). An outer peripheral surface of the interpolar bridge (27) is formed by a first plane (27a), and therefore, the route of magnetic flux passing through a magnetic gap (10) becomes longer, thus reducing q-axis inductance. In addition, a radial direction width (W3) of the interpolar bridge (27) and circumferential direction width (W4) of the interpolar radius bridge (28) are constant, and are arranged perpendicular to one another to make a T-shape, thereby making it possible to alleviate concentration of stress during press-fitting of the permanent magnets (23) into magnet holes (22b).

Description

technical field [0001] The present application relates to a rotating electric machine, in particular to a structure of a rotor core. Background technique [0002] As a rotating electrical machine used in electric power steering for vehicles, industrial motors, etc., there is a rotating electrical machine in which three-phase current is supplied from an inverter to a coil wound on a plurality of pole teeth formed on a stator core. . As such a rotating electric machine, there is known a rotating electric machine including, on the inner peripheral side of a stator core, a rotor held rotatably via a magnetic gap. In the rotor core, a plurality of magnet holes are provided in the circumferential direction, and permanent magnets forming magnetic poles are embedded. [0003] There is known a technique in which, in the permanent magnet embedded type rotating electrical machine as described above, the outer peripheral surface of each magnetic pole of the rotor core facing the magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/276H02K2213/03H02K29/03H02K1/2766
Inventor 冈崎広大元吉研太滝泽勇二池田纮子佐佐木秀德广谷迪阿久津悟冈崎正文N·杉
Owner MITSUBISHI ELECTRIC CORP