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

Motor drive device, and heat pump device and refrigerating and air-conditioning device using said motor drive device

A motor drive and motor technology, applied in the field of motor drive devices, can solve problems such as difficult current detection

Active Publication Date: 2018-05-29
MITSUBISHI ELECTRIC CORP
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, in the 1-shunt current detection method, there is a problem that it is difficult to detect the current of two phases from the phase of the inverter output voltage.

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 drive device, and heat pump device and refrigerating and air-conditioning device using said motor drive device
  • Motor drive device, and heat pump device and refrigerating and air-conditioning device using said motor drive device
  • Motor drive device, and heat pump device and refrigerating and air-conditioning device using said motor drive device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] First, the basic configuration and operation of the motor drive device in this embodiment will be described. figure 1 It is a circuit diagram showing the structure of the motor drive device 30 in this embodiment. Such as figure 1 As shown, the motor drive device 30 in this embodiment is a device that supplies AC power to the motor 3 as an AC motor to drive the motor 3, and is configured to include: a DC power supply 1 that is a supply source of DC power; an inverter 2 , which converts direct current into alternating current, and applies an alternating current voltage to the motor 3 ; and an inverter control unit 4 , which controls the inverter 2 .

[0043] exist figure 1 In the illustrated motor drive device 30 , the inverter 2 is configured to include switching elements 5 a to 5 f and diodes 6 a to 6 f connected in parallel to the switching elements 5 a to 5 f. The inverter 2 is provided with a DC voltage detection unit 7 that detects the voltage of the DC power sup...

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

This motor drive device is provided with: an inverter 2 which converts a DC voltage from a DC power source 1 to an AC voltage and which applies the AC voltage to a motor which drives rotation of the load; a DC voltage detection unit 7 which detects the voltage of the DC power source 1; a shunt resistor which is a current detection unit 8 and detects the current flowing in the inverter 2; and an inverter control unit 4 which generates a PWM signal for driving switching elements 5a-5f of the inverter 2 on the basis of the voltage detected by the DC voltage detection unit 7 and the current detected by the shunt resistor, and which controls the inverter 2 such that the phase of the carrier signal used in generation of the PWM signal and the phase of the AC voltage have a specific phase difference and such that the frequency of the PWM signal is synchronized, with an integral multiple of 3, with the frequency of the AC voltage.

Description

technical field [0001] The present invention relates to a motor drive device for driving a motor, a heat pump device and a refrigerating and air-conditioning device using the motor drive device. Background technique [0002] As a method of detecting the current of each phase flowing through the three-phase load, there is a method of using a shunt resistor. As a structure provided with a shunt resistor, there is a structure provided with a power supply shunt resistor for detecting a current between the DC power supply and the inverter device (hereinafter, this structure is referred to as "one-shunt current detection method"). In this case, according to the state of the inverter output voltage, that is, the on or off state of the inverter switching element, the phase of the load current flowing through the power supply shunt resistor changes, so by depending on the state of the inverter switching element The on or off state is used to detect the voltage drop at the power supp...

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 Applications(China)
IPC IPC(8): H02P6/16
CPCF25B13/00F25B40/00H02P27/08H02P6/085F25B2400/13F25B2600/021Y02B30/70H02P6/16F25B30/02F25B49/025H02P11/06
Inventor 植村启介畠山和德篠本洋介有泽浩一
Owner MITSUBISHI ELECTRIC CORP