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Air conditioning device

A technology of air-conditioning device and driving device, which is applied in space heating and ventilation, control input related to air characteristics, space heating and ventilation control input, etc. It can solve the problems of reduced driving efficiency and large total output of air conditioners, and achieves The effect of improving driving efficiency

Pending Publication Date: 2022-06-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the high output state continues after the indoor temperature reaches the set temperature, the indoor temperature will overshoot and the total output of the air conditioner will be too large.
In addition, if the operation under the delta connection is continued after the indoor temperature reaches the set temperature, the driving efficiency will decrease.

Method used

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  • Air conditioning device
  • Air conditioning device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] First, the configuration of the air conditioner 1 according to Embodiment 1 will be described. figure 1 It is a figure which shows the structure of the air-conditioning apparatus 1 which concerns on Embodiment 1. The air conditioner 1 has an outdoor unit 2 and an indoor unit 3 .

[0026] The outdoor unit 2 includes a compressor 21 that compresses the refrigerant, a motor drive device 22 that drives the compressor 21, an outdoor unit control unit 23 that controls air conditioning, and air that moves from the outside of the outdoor unit 2 to the inside of the outdoor unit 2. The outdoor unit heat exchanger 24 in which the refrigerant exchanges heat. The outdoor unit 2 further includes a four-way valve 25 for switching the flow path of the refrigerant, a decompression unit 26 for reducing the pressure of the refrigerant, a refrigerant storage unit 27 for storing the refrigerant, and a flow of air outside the outdoor unit 2 to the outside of the outdoor unit 2 . The outdo...

Embodiment approach 2

[0051] During the operation of the air conditioner 1 according to the first embodiment, the absolute value of the temperature difference ΔT may change from a state smaller than the threshold value ΔTrs to larger than the threshold value due to a change in the indoor temperature or a change in the set temperature by operating the remote controller 4 . The state of ΔTrs. Although the air conditioner 1 is required to be in a high output state, since the connection state of the electric motor 43 is a star connection, the rotation speed of the electric motor 43 is limited to a certain threshold value or less, and the air conditioner 1 does not enter the high output state. The air conditioner according to Embodiment 2 is a device that switches the connection state of the electric motor without stopping the compressor when a high output state is required. The configuration of the air conditioner according to Embodiment 2 is the same as the configuration of the air conditioner 1 accor...

Embodiment approach 3

[0058] In the above-described first and second embodiments, the selection of the connection state is performed based on the absolute value of the temperature difference ΔT. The air-conditioning apparatus according to Embodiment 3 is an apparatus that does not select the connection state based on the absolute value of the temperature difference ΔT. Specifically, the air conditioner according to Embodiment 3 selects the connection state of the electric motor based on the connection state selection mode that does not depend on the absolute value of the temperature difference ΔT. The connection state selection mode indicates a mode of connection states of the three stator windings included in the motor. In Embodiment 3, differences from Embodiment 1 will be mainly described.

[0059] Figure 9 It is a flowchart which shows each step of the operation|movement performed by the air-conditioning apparatus which concerns on Embodiment 3. FIG. The indoor unit control unit 31 receives...

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PUM

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Abstract

This air conditioning device (1) is provided with: an indoor unit (3); and an outdoor unit (2) having a compressor (21) for compressing the refrigerant and a motor drive device (22) for driving the compressor (21). A motor drive device (22) is provided with: an inverter (42) that converts a DC voltage into an AC voltage; and a motor (43) including three stator windings, both ends of which are in an open state. The motor (43) operates on the basis of the AC voltage obtained by the inverter (42). The motor drive device (22) is further provided with a wiring state switching unit (46) having a function of changing the wiring state of three stator windings included in the motor (43), and setting the wiring state to a star wiring state at the start of operation of the air conditioning device (1).

Description

technical field [0001] The present invention relates to an air conditioner that switches the connection state of stator windings of an electric motor. Background technique [0002] Conventionally, there has been proposed a motor drive device that switches the connection state of stator windings included in a motor. In the conventional motor drive device, the star connection and the delta connection are switched by a relay using a coil. For example, in a motor drive device for a compressor of an air conditioner, it is preferable to drive the motor in a star-connected state under low-load conditions that contribute significantly to annual power consumption, and drive the motor in a delta-connected state under high load conditions. The state drives the motor. Thereby, the driving efficiency under low load conditions can be improved, and the high output under high load conditions can also be achieved. [0003] In the technique disclosed in Patent Document 1, when the remote c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/28F24F11/86F04B49/02F04C28/06F04C28/08
CPCF04B49/02F24F11/86H02K3/28F24F11/88F24F2110/10F24F2110/20F04B35/04F04C2270/90F04C2270/80F25B49/022F25B2600/021H02K1/12H02P27/06
Inventor 志津圭一朗畠山和德川岛惇德田裕卓
Owner MITSUBISHI ELECTRIC CORP