阅读说明：本技术 电力转换装置及空气调节机 (Power conversion device and air conditioner ) 是由 有泽浩一 丰留慎也 土谷厚司 于 2017-12-13 设计创作，主要内容包括：一种将直流电力转换为交流电力并向搭载于压缩机(1)的电动机施加交流电力的电力转换装置(500),其具备将直流电力转换为交流电力的逆变器(3)和故障度算出部,所述故障度算出部基于示出压缩机(1)的状态的物理量的测量结果算出故障度,所述故障度示出压缩机(1)的故障的程度。(A power conversion device (500) that converts DC power to AC power and applies AC power to a motor mounted on a compressor (1) is provided with an inverter (3) that converts DC power to AC power, and a failure degree calculation unit that calculates a failure degree indicating the degree of failure of the compressor (1) based on the measurement result of a physical quantity that indicates the state of the compressor (1).)

1. A power conversion device that converts DC power into AC power and applies the AC power to a motor mounted on a compressor, the power conversion device comprising:

an inverter that converts the direct-current power into the alternating-current power; and

a failure degree calculation unit that calculates a failure degree indicating a degree of failure of the compressor based on a measurement result of a physical quantity indicating a state of the compressor.

2. The power conversion apparatus according to claim 1,

the power conversion device is provided with a control unit that controls the inverter based on the degree of failure.

3. The power conversion apparatus according to claim 2,

the failure degree is calculated as follows: the value becomes minimum when the compressor is normal, the value becomes larger as the degree of the failure of the compressor becomes higher,

the control unit controls the inverter so that the operating frequency of the motor is lower than the operating frequency in a normal state when the failure degree exceeds a first threshold, and the motor is stopped when the failure degree exceeds a second threshold that is larger than the first threshold.

4. The power conversion apparatus according to claim 3,

the power conversion device notifies a user that a failure of the compressor has been detected when the degree of failure exceeds a first threshold value or when the degree of failure exceeds a second threshold value.

5. The power conversion apparatus according to any one of claims 1 to 4,

the measurement result of the physical quantity showing the state of the compressor includes at least one of a current flowing in the motor, a temperature of the compressor, a state of vibration in the compressor, and a height of an oil surface of lubricating oil in the compressor.

6. The power conversion apparatus according to any one of claims 1 to 5,

the measurement result of the physical quantity showing the state of the compressor is a measurement result of a plurality of physical quantities of different kinds.

7. The power conversion apparatus according to any one of claims 1 to 6,

the failure degree calculation unit calculates the failure degree using machine learning.

8. The power conversion apparatus according to claim 7,

the machine learning is supervised learning.

9. The power conversion apparatus according to claim 7 or 8,

the input data to the machine learning is time series data or frequency component data of a specific frequency.

10. An air conditioner, comprising:

a compressor provided with a motor; and

the power conversion device according to any one of claims 1 to 9 that applies alternating-current power to the motor.

Technical Field

The present invention relates to a power converter for applying power to a motor for driving a compressor, and an air conditioner including the power converter.

Background

In a refrigeration cycle apparatus or the like, there is a technique of diagnosing a failure. For example, patent document 1 discloses an abnormality detection device that detects an abnormality of a device based on a first state value related to the device when a drive unit is stopped and a second state value related to the device when the drive unit is started.

Prior art documents

Patent document

Patent document 1: international publication No. 2016/035187

Disclosure of Invention

Problems to be solved by the invention

In a compressor, it is sometimes desired to cope with a failure differently depending on the degree of the failure. For example, depending on the degree of failure, it may be desirable to take different measures such as stopping the motor of the compressor or changing the operating frequency of the motor of the compressor. However, the abnormality detection device described in patent document 1 performs abnormality determination based on a difference between a specific physical quantity when the drive unit is started and a specific physical quantity when the drive unit is stopped. Therefore, there is a problem that only the presence or absence of a failure can be determined.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a power conversion device capable of determining the degree of a failure.

Means for solving the problems

In order to solve the above problems and achieve the object, a power converter according to the present invention is a power converter that converts dc power into ac power and applies the ac power to a motor mounted on a compressor, and includes an inverter that converts the dc power into the ac power. The power conversion device further includes a failure degree calculation unit that calculates a failure degree indicating a degree of failure of the compressor based on a measurement result of the physical quantity indicating the state of the compressor.

ADVANTAGEOUS EFFECTS OF INVENTION

The power conversion device of the present invention can exhibit the effect of being able to determine the degree of failure.

Drawings

Fig. 1 is a diagram showing a configuration example of a power conversion device according to embodiment 1.

Fig. 2 is a diagram showing a configuration example of the compressor according to embodiment 1.

Fig. 3 is a diagram showing a configuration example of the inverter according to embodiment 1.

Fig. 4 is a diagram showing a configuration example of the arithmetic unit according to embodiment 1.

Fig. 5 is a diagram showing a configuration example of a control circuit in embodiment 1.

Fig. 6 is a diagram showing a configuration example of a power conversion device using a measurement result of the vibration state of the compressor of embodiment 1.

Fig. 7 is a diagram showing a configuration example of a compressor to which ac power is supplied from the power conversion device shown in fig. 6 of embodiment 1.

Fig. 8 is a diagram showing a configuration example of an arithmetic unit of the power conversion device shown in fig. 6 according to embodiment 1.

Fig. 9 is a diagram showing an example of the vibration level detected by the vibration detection unit when the compressor of embodiment 1 is normal.

Fig. 10 is a diagram showing an example of the vibration level detected by the vibration detection unit in a state where the frictional resistance is increased from normal due to damage of a specific portion of the drive shaft of the compressor according to embodiment 1.

Fig. 11 is a diagram showing a functional configuration example of the failure degree calculating unit according to embodiment 1.

Fig. 12 is a schematic diagram showing signal transmission of the neural model included in the intermediate portion in embodiment 1.

Fig. 13 is a schematic diagram showing the degree of failure set as the teacher signal in the case where the state of failure is artificially generated in embodiment 1.

Fig. 14 is a diagram showing an operation example of the power conversion device in the case where the countermeasure according to the failure degree is performed in embodiment 1.

Fig. 15 is a diagram showing a configuration example of an air conditioner according to embodiment 2.

Detailed Description

Hereinafter, a power conversion device and an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.