Motor current detection device and air conditioning device

A current detection device and motor technology, which are applied in motor control, AC motor control, single motor speed/torque control, etc., can solve problems such as difficulty in detecting only motor current, and achieve the effect of high precision

Active Publication Date: 2013-03-13
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such a motor device, when the technique of Patent Document 1 is used to detect the motor current flowing in the motor part, in the structure of the motor device, the motor current The drive current flowing in the driver also flows, so it is difficult to detect only the motor current with high precision

Method used

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  • Motor current detection device and air conditioning device
  • Motor current detection device and air conditioning device
  • Motor current detection device and air conditioning device

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Embodiment approach

[0142] (a)

[0143] In the above-mentioned embodiment, the case where the air-conditioning apparatus 1 is a dehumidifying-type outside-air air conditioner equipped with a heat exchanger inside has been described as an example. However, the air conditioner of the present invention can also be used in a dehumidifying air conditioner in which a heat exchanger and an air conditioner are arranged separately, or in an air conditioner employing a method other than dehumidification.

[0144] (b)

[0145] In the above-mentioned embodiment, the case where the instantaneous current detection part 95 and the average current detection part 96 are comprised by the hardware which consists of resistors R2-R5 and capacitors C2-C4 respectively was demonstrated. However, the instantaneous current detection unit 95 and the average current detection unit 96 may be configured by software as long as they can detect the instantaneous value and the average value of the GND current Ig, respectively. ...

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Abstract

The present invention provides a motor current detecting device an accurate motor current can be obtained and an air conditioning apparatus comprising this motor current detecting device. A motor current detecting device (9) comprises a GND wire (93), an instantaneous current detecting unit (95), an average current detecting unit (96), and a calculation unit (99). On the GND wire (93), a motor current (Im) that has been passed through a second fan motor (81) and a drive current (Id) that has been passed through a second motor driver (82) for driving the second fan motor (81). The instantaneous current detecting unit (95) detects an instantaneous value of the sum of the motor current (Im) and the drive current (Id) flowing on the GND wire (93). The average current detecting unit (96) detects an average value of the sum of the motor current (Im) and the drive current (Id) flowing on the GND wire (93). The calculation unit (99) calculates the motor current (Im) on the basis of the detection results of the instantaneous current detecting component (95) and the average current detecting unit (96).

Description

technical field [0001] The invention relates to a motor current detection device. In addition, the present invention relates to an air conditioner including a motor current detection device. Background technique [0002] The air conditioner is equipped with various equipment such as a compressor and a fan. As a power source for these devices, electric motors are often used. The motor is connected to a motor drive unit (hereinafter referred to as "driver") composed of a plurality of switching elements, and can be rotated by a driving voltage output by turning on and off each switching element in the driver. [0003] In addition, the rotation speed of the motor is sometimes controlled to operate various devices such as compressors and fans in an appropriate state. In such motor speed control, the motor current to the motor is often used. Here, as a method of detecting the motor current, for example, as disclosed in Patent Document 1, a shunt resistor as a current detection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/16H02P6/06H02P6/08
CPCH02M2001/0009H02M5/42H02P27/06H02P2205/01H02M1/0009F25B49/022F25B49/025F25B2600/021F25B2700/00F25B2700/15F25B2700/151
Inventor 桥本雅文嶋谷圭介前田浩仁八木达池田基伸
Owner DAIKIN IND LTD
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