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Electric motor and air conditioner equipped with electric motor

A technology of motors and sensors, applied in mechanical equipment, electric components, air-conditioning systems, etc., can solve the problems of motor efficiency reduction, maximum output reduction, leakage, etc., and achieve the effect of high-efficiency driving

Active Publication Date: 2022-02-15
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, depending on the arrangement position of the magnetic sensor, it may be affected by the leakage magnetic flux from the magnetic flux coil of the stator.
If affected by the leakage magnetic flux of the magnetic flux coil, it becomes an important factor of the phase shift of the magnetic sensor output, and there is a problem that the efficiency of the motor decreases, resulting in a decrease in the maximum output.

Method used

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  • Electric motor and air conditioner equipped with electric motor
  • Electric motor and air conditioner equipped with electric motor
  • Electric motor and air conditioner equipped with electric motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] figure 1 It is a figure which shows the electric motor which concerns on Embodiment 1 of this invention. exist figure 1 A partial cross section of a part of the motor 1 is cut along a plane including the axis center of the rotating shaft 31 described later in . The motor 1 is a three-phase brushless DC (Direct Current: direct current) motor, and includes a molded stator 10 , a rotor 30 , a magnetic sensor 50 , and a bracket 60 .

[0022] The molded stator 10 has a stator 20 , a disk-shaped built-in substrate 11 , and a molding resin 12 for molding. The stator 20 has a stator core 21 , a magnetic flux coil 22 and an insulator 23 . The stator core 21 is an annular member formed by laminating electromagnetic steel sheets. The stator core 21 is provided with a plurality of slots (not shown) at constant intervals in the circumferential direction. The insulator 23 is an insulating component, and is integrally formed with the plurality of slots respectively. A magnetic f...

Embodiment approach 2

[0047] Figure 8 It is a figure which schematically shows the inside of the electric motor concerning Embodiment 2 of this invention. Like Embodiment 1, rotor magnet 150 of motor 100 has sensor magnet portion 151 on the side closer to magnetic sensor 50 and main magnet portion 152 on the side closer to bracket 60 . In addition, the sensor magnet portion 151 is integrally formed with the main magnet portion 152 . The outer diameter of the sensor magnet part 151 is smaller than that of the main magnet part 152 . In the axial direction of the rotating shaft 31, the position T21 of the end portion of the main magnet portion 152 on the magnetic sensor 50 side is located closer to the magnetic sensor 50 than the position T22 of the coil end portion of the magnetic flux coil 22 of the stator 20 on the magnetic sensor 50 side. s position. Other configurations are the same as those in Embodiment 1.

[0048] According to the second embodiment, the leakage magnetic flux from the magn...

Embodiment approach 3

[0050] Figure 9 It is a figure which shows the apparatus structure of the air conditioner concerning Embodiment 3 of this invention. Figure 10 It is a block diagram of the air conditioner in Embodiment 3 of this invention. The air conditioner 200 includes an indoor unit 210 and an outdoor unit 220 connected to the indoor unit 210 . The outdoor unit 220 includes a compressor 221 , a heat source side heat exchanger 222 , an outdoor unit blower 223 that blows air to the heat source side heat exchanger 222 , and a motor 224 . The control unit 225 controls each part of the outdoor unit 220, and is constituted by, for example, a microcontroller. The electric motor 224 is a drive source of the blower 223 for an outdoor unit, and is controlled by the control unit 225 . The indoor unit 210 includes a throttle device 211 , a load-side heat exchanger 212 , an indoor-unit blower 213 that blows air to the load-side heat exchanger 212 , and a motor 214 . The control unit 215 controls ...

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Abstract

The electric motor has a stator, a rotor, and a magnetic sensor. The stator has an iron core and flux coils. The rotor has a rotating shaft and a cylindrical rotor magnet. The magnetic sensor has a sensor unit that outputs an electrical signal based on applied magnetic flux. The rotor magnets are arranged to face the iron core of the stator. The rotor magnet has a main magnet part and a sensor magnet part. The sensor magnet part is integrally formed with the main magnet part and has an outer diameter smaller than that of the main magnet part. The magnetic sensor is arranged on the side where the sensor magnet part is located. The outer peripheral edge of the magnet portion of the sensor is located farther from the rotation axis than the center of the magnetic sensor. In the magnetic sensor, the center of the sensor part does not coincide with the center of the magnetic sensor, and the center of the sensor part is located closer to the sensor magnet part than the center of the magnetic sensor.

Description

technical field [0001] The present invention relates to an electric motor and an air conditioner including the electric motor as a driving source. Background technique [0002] Conventionally, a motor has a rotor and a stator. The rotor has a rotating shaft rotatably provided at the center of the motor case, and a rotor magnet provided around the rotating shaft. The stator has an iron core and a magnetic flux coil wound around the iron core. The rotor and stator are configured such that the iron core of the stator surrounds the rotor magnets of the rotor. Furthermore, a magnetic sensor for detecting the position of the rotor magnet of the rotor is provided. Then, the position of the rotor magnet is calculated based on the output of the magnetic sensor, and the drive current of the flux coil is controlled based on the position information of the rotor to obtain a desired rotation output (for example, Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/08H02K1/27H02K11/215
CPCH02K29/08F24F11/30F24F1/38F24F1/0018H02K11/21F24F2203/1068
Inventor 尾屋隼一郎山本峰雄石井博幸浦边优人下川贵也
Owner MITSUBISHI ELECTRIC CORP