Unlock instant, AI-driven research and patent intelligence for your innovation.

Motor drives and air conditioners

A driving device and motor technology, applied in the direction of electromechanical devices, AC motor control, electric components, etc., can solve the problems of poor yield, achieve low price and high current, and realize the effect of high current

Active Publication Date: 2019-10-15
MITSUBISHI ELECTRIC CORP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the switching element is mounted on a chip, if the chip area increases, the yield will deteriorate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Motor drives and air conditioners
  • Motor drives and air conditioners
  • Motor drives and air conditioners

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] figure 1 It is a figure which shows the structural example of the motor drive apparatus concerning Embodiment 1 of this invention. Such as figure 1 As shown, the motor drive device 100 of this embodiment includes: a rectifier 2 for rectifying the AC current input from the AC power supply 1 into a DC current, a reactor 3, a capacitor 4, and a voltage detection unit for detecting the voltage across the capacitor 4. 11. The DC current is converted into a three-phase AC current to drive the motor 8 as a three-phase motor, that is, the inverter part 101 of the motor, the control part 9 for generating the PWM signal used to control the inverter part 101, and the current measurement part 21 to 38, and the drive control section 39. Between the inverter unit 101 and the motor 8, current measurement units 10a, 10b for measuring the motor current are provided.

[0043] The motor drive device 100 of this embodiment can be used in air conditioners, refrigerators, washing and dryi...

Embodiment approach 2

[0073] Next, a motor drive device according to Embodiment 2 of the present invention will be described. In Embodiment 1, an example in which each switching element is provided with a current measurement unit for measuring current has been described, but in this embodiment, an example in which each arm is provided with a current measurement unit will be described.

[0074] Figure 4 It is a figure which shows the example of the arrangement|positioning of the current measurement part 40 of this embodiment. The current measuring unit 40 measures the current at a confluence point corresponding to connecting lines of the switching elements 5b, 5d, and 5f of the lower arm of the inverter module 5 of the U phase. Although not shown in the figure, the upper arm side of the inverter module 5 is also provided with a current measuring unit that measures the current at the confluence point of the connection lines of the switching elements 5a, 5c, and 5e of the upper arm. Inverter module...

Embodiment approach 3

[0089] Next, a motor drive device according to Embodiment 3 of the present invention will be described. In Embodiment 2, an example in which each arm is provided with a current measurement unit for measuring current is described, but in this embodiment, an example in which a motor drive device is provided with one current measurement unit will be described.

[0090] Figure 5 It is a figure which shows the example of the arrangement|positioning of the current measurement part 41 of this embodiment. The current measurement unit 41 measures the current of the DC bus on the negative side. exist Figure 5 In the above example, the current measurement unit 41 is provided on the negative side DC bus, but instead of the current measurement unit 41 , a current measurement unit may be provided on the positive side DC bus.

[0091] The motor drive device of the present embodiment includes a current measurement unit 41 instead of the current measurement unit for each arm of the motor ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A motor driving device (100), which converts direct current into a three-phase alternating current to drive a motor (8) as a three-phase motor, the motor driving device (100) has: an inverter module (5, 6, 7 ), the number of which is the same as the number of phases of the motor (8); and a control unit (9), which generates a PWM signal for PWM driving the inverter module (5, 6, 7), and the inverter module (5 , 6, 7) A plurality of switching element pairs formed by connecting two switching elements in series are provided, and the plurality of switching element pairs are connected in parallel.

Description

technical field [0001] The present invention relates to a motor drive device and an air conditioner provided with switching elements. Background technique [0002] A technique for driving a motor by PWM (Pulse Width Modulation) control using a switching element is known. One example of PWM control is disclosed in Patent Document 1. [0003] When the switching element is mounted on a chip, if the chip area increases, the yield will deteriorate. If the chip area is reduced, the yield at the time of taking out from the wafer can be improved, and thus the cost can be reduced. [0004] Patent Document 1: Japanese Patent No. 4675902 Contents of the invention [0005] According to the prior art, when a switching element is mounted on a chip, the cost can be reduced if the chip area is reduced. However, if the chip area is reduced, the current capacity is reduced. Therefore, in a motor drive device using a switching element, there is a problem that it is difficult to achieve ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08H02M1/088H02M7/00H02P25/16H02M7/5387H02M7/5395
CPCH02M1/088H02M7/003H02M7/53871H02M7/5395H02P25/16H02P27/08H02K5/18H02M1/0009H02M1/008F25B49/022F25B2600/021F25B2600/024H01L21/0445H02M7/48H05K7/20272H05K7/2039H02M7/53875H02M7/53876
Inventor 下麦卓也篠本洋介有泽浩一畠山和德
Owner MITSUBISHI ELECTRIC CORP