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Motor, fan, electric vacuum cleaner, and hand drying device

A technology for motors and rotors, which is applied in the field of electric vacuum cleaners, hand dryers, and blowers. It can solve problems such as the inability to determine the rotation of the rotor, and achieve the effect of suppressing the increase of magnetic flux density and reducing iron loss.

Pending Publication Date: 2020-06-12
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, when the shape of the front end of the tooth is symmetrical in the circumferential direction, it cannot be determined which direction the rotor rotates in, clockwise or counterclockwise, when the stator magnetic field is generated.

Method used

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  • Motor, fan, electric vacuum cleaner, and hand drying device
  • Motor, fan, electric vacuum cleaner, and hand drying device
  • Motor, fan, electric vacuum cleaner, and hand drying device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0033]

[0034] figure 1 It is a sectional view showing the motor 100 according to Embodiment 1 of the present invention. The motor 100 is a permanent magnet synchronous motor, which is a single-phase motor driven by an inverter. The motor 100 is used, for example, in a blower 110 of an electric vacuum cleaner or a hand dryer (refer to Figure 13 ).

[0035] The motor 100 has: a rotor 5 having a shaft 50 ; and a stator 1 arranged to surround the rotor 5 . The stator 1 is fixed inside a metal cylindrical frame 4 .

[0036] In the following description, the direction of the rotation axis C1 which is the central axis of the shaft 50 is referred to as "axial direction". In addition, the circumferential direction centered on the rotation axis C1 of the shaft 50 (in figure 1 etc. shown by arrow R1) is called "circumferential direction". In addition, the radial direction centering on the rotation axis C1 of the shaft 50 is referred to as "radial direction". In addition, th...

Embodiment approach 2

[0100] Next, Embodiment 2 of the present invention will be described. A motor 100A according to Embodiment 2 includes a rotor 5A having a shaft 50A, and a stator 1A surrounding the rotor 5A. Stator 1A is fixed to the figure 1 The inner peripheral side of the frame 4 is shown. In Embodiment 2, the number of magnetic poles of the rotor 5A is two, and the yoke 11A of the stator 1A is annular.

[0101] The rotor 5A has a shaft 50A and permanent magnets 51A and 52A fixed around the shaft 50A. The rotor 5A has two poles and has one permanent magnet 51A and one permanent magnet 52A.

[0102] The stator 1A has a stator core 10A, an insulating part 3 ( figure 1 ) and coils. The stator core 10A is formed by stacking a plurality of laminated elements (for example, electrical steel sheets, etc.) in the axial direction and fixing them integrally by caulking portions 16A, 17A, and 18A.

[0103] The stator core 10A has an annular yoke 11A surrounding the rotor 5A, and a plurality of ...

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Abstract

This motor is provided with a rotor having a plurality of magnetic poles and a stator disposed outside the rotor in the radial direction and having the same number of teeth as the number of magnetic poles. Each of the teeth has: a first side portion that is the end edge in a first direction of the circumferential direction; a second side portion that is an end edge in a second direction opposite to the first direction; and a tooth end facing the rotor. Each of the teeth unexceptionally has a first projection portion and a second projection portion on the tooth end side, said first projection portion projecting from the first side portion in the first direction, said second projection portion projecting from the second side portion in the second direction. The tooth end has a first end in the first direction and a second end in the second direction, wherein the distance G2 between the second end and the rotor is wider than the distance G1 between the first end and the rotor. When the line orthogonal to a radial direction line at an intermediate position between the first side portion and the second side portion and passing through the rotational axis is defined as a reference line,the distance D1 from the reference line to the boundary between the first projection portion and the first side portion is longer than the distance D2 from the reference line to the boundary between the second projection portion and the second side portion.

Description

technical field [0001] The present invention relates to a motor, a blower equipped with the motor, an electric vacuum cleaner, and a hand dryer. Background technique [0002] Generally, in an inner rotor type single-phase motor, the number of teeth of the stator matches the number of magnetic poles of the rotor. When the rotation of the motor stops, the front ends of the teeth face the magnetic pole faces of the rotor due to magnetic attraction force. At the beginning of rotation, current flows through the coils of the stator to generate a magnetic field, which rotates the rotor by magnetic repulsion. [0003] On the other hand, when the shapes of the tip portions of the teeth are symmetrical in the circumferential direction, it is impossible to specify which direction the rotor rotates in, clockwise or counterclockwise, when the stator magnetic field is generated. Then, in the motor disclosed in Patent Document 1, a tip extension portion protruding in one direction (for e...

Claims

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Application Information

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IPC IPC(8): H02K1/14
CPCH02K1/146H02K1/24H02K1/278H02K3/345H02K5/207H02K9/06H02K2213/03H02K2201/03H02K1/148A47K10/48A47L5/24A47L9/2842A47L9/28H02K7/14H02K37/14
Inventor 土田和庆
Owner MITSUBISHI ELECTRIC CORP
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