阅读说明：本技术 数据获取方法、逆变器和旋转电机 (Data acquisition method, inverter, and rotating electrical machine ) 是由 富田敏夫 斋藤宪一 岩瀬裕太 佐野正浩 于 2017-09-29 设计创作，主要内容包括：本发明提供结构不复杂也能管理装置的工作状态的数据获取方法、逆变器和旋转电机。为此,提供一种使用用于控制同步电动机的逆变器进行的数据获取方法,逆变器的位置速度运算部基于同步电动机与逆变器之间的电流值计算同步电动机的电角度,对用于与该电角度的信息同步地控制同步电动机的逆变器内的内部数据进行取样,来获取对应于每个电角度的数据。(The invention provides a data acquisition method, an inverter and a rotating electrical machine, which can manage the working state of the device without complex structure. To this end, a data acquisition method using an inverter for controlling a synchronous motor is provided, in which a position/speed calculation unit of the inverter calculates an electrical angle of the synchronous motor based on a current value between the synchronous motor and the inverter, and samples internal data in the inverter for controlling the synchronous motor in synchronization with information on the electrical angle to acquire data corresponding to each electrical angle.)

1. A data acquisition method using an inverter for controlling a synchronous motor, characterized in that:

a position and speed calculation unit of the inverter calculates an electrical angle of the synchronous motor based on a current value between the synchronous motor and the inverter,

internal data within the inverter for controlling the synchronous motor in synchronization with the information of the electrical angle is sampled to acquire data corresponding to each of the electrical angles.

2. The data acquisition method as set forth in claim 1, wherein:

the synchronous motor is provided with an acceleration sensor,

sampling external data from the acceleration sensor in synchronization with the information of the electrical angle to acquire the external data.

3. The data acquisition method according to claim 1 or 2, characterized in that:

the sampling is performed every 360 ° of the electrical angle.

4. An inverter for controlling a synchronous motor, characterized in that:

the inverter comprises a semiconductor switching element, a control device for controlling the on/off of the semiconductor switching element, and a current detection unit,

the control device includes:

an instruction generating unit that generates an instruction value;

a PWM control pulse generating unit for generating a PWM signal in accordance with the command from the command generating unit;

a position/speed calculation unit that estimates an electrical angle of the synchronous motor using a current value from the current detection unit;

an electric angle counter for receiving the information of the electric angle from the position and speed calculating part and outputting a trigger signal to the electric angle synchronous sampling processing part;

an electric angle synchronous sampling processing unit which samples data using an output of the electric angle counter as a trigger signal and outputs the sampled data as synchronous monitoring data; and

a monitoring data storage unit for storing the synchronous monitoring data.

5. The inverter of claim 4, comprising:

an abnormality determination processing unit that determines whether or not the synchronous monitoring data for a mechanical device driven by the synchronous motor controlled by the inverter has an abnormality when sampling of the synchronous monitoring data is completed for an operation cycle 1 cycle; and

and an upper transfer processing unit that transfers the synchronization monitoring data to an upper control device when the abnormality determination processing unit determines that the synchronization monitoring data is abnormal.

6. The inverter of claim 4, comprising:

and an upper transfer processing unit that periodically transfers the synchronous monitoring data to an upper device when sampling of the synchronous monitoring data is completed for an operation cycle 1 cycle of a machine driven by the synchronous motor controlled by the inverter.

7. The inverter of claim 4, wherein:

the inverter is provided with an acceleration sensor which is,

the electric angle synchronous sampling processing unit samples data from the acceleration sensor using an output of the electric angle counter as a trigger signal, outputs the sampled data as synchronous monitoring data, and stores the synchronous monitoring data in the monitoring data storage unit.

8. The inverter of claim 4, wherein:

an origin pulse signal from a synchronous detector of a machine driven by the synchronous motor controlled by the inverter is input to the electric angle counter so that a trigger start time of the synchronous monitoring data coincides with an origin of the machine.

9. The inverter of claim 4, wherein:

the electrical angle synchronous sampling processing unit performs the sampling every 360 ° of the electrical angle.

10. A rotating electrical machine, characterized by comprising:

a synchronous motor; and

an inverter that controls the synchronous motor, and a motor,

the inverter comprises a semiconductor switching element, a control device for controlling the on/off of the semiconductor switching element, and a current detection unit,

the control device includes:

an instruction generating unit that generates an instruction value;

a PWM control pulse generating unit for generating a PWM signal in accordance with the command from the command generating unit;

a position/speed calculation unit that estimates an electrical angle of the synchronous motor using a current value from the current detection unit;

an electric angle counter for receiving the information of the electric angle from the position speed calculation unit and outputting the information to the electric angle synchronous sampling processing unit;

an electric angle synchronous sampling processing unit which samples data using an output of the electric angle counter as a trigger signal and outputs the sampled data as synchronous monitoring data; and

a monitoring data storage unit for storing the synchronous monitoring data.

Technical Field

The present invention relates to a data acquisition method, an inverter, and a rotating electrical machine, and more particularly, to abnormality detection of a machine device that is driven by a rotating electrical machine and performs a periodic operation.

Background

When a mechanical device driven by a rotating electric machine, for example, a rolling mill of a steel plant is stopped due to a failure, the operation of a production line or the entire steel plant may be stopped, and a loss may be large when the equipment is stopped due to the occurrence of an unexpected abnormality. Therefore, there is a need for a technique of detecting an abnormality before occurrence of a failure that may cause a stoppage of equipment, performing preventive maintenance, and performing abnormality detection before occurrence of a failure.

In general, various sensors are mounted to detect the state of a target machine in detail, and data obtained from these sensors is analyzed in detail to determine the state. Further, by continuing these operations for a long period of time, changes in the state of each part over time are managed, and preventive maintenance is performed before an abnormality occurs.

In general, these abnormality detection systems are configured by a measurement device independent of the equipment and a dedicated analysis device, and therefore only target important equipment that needs to be monitored at all times.

As a background art in this field, for example, patent document 1 is known. Patent document 1 discloses an apparatus including: a unit for measuring a plurality of current and/or voltage signals of the electromechanical system; means for measuring an angular position of a rotating shaft of an object of the electromechanical system or means for estimating a value of a discrete angular position of the rotating shaft of the object of the electromechanical system; a unit for synchronizing a plurality of current and/or voltage signals with the rotation axis's dimensional analyzed angular displacement; a unit that divides the plurality of synchronous electric signals into a plurality of sections corresponding to each full rotation of the rotating shaft; a unit for calculating an average value of a plurality of synchronous electric signals in several intervals; means for extracting large characteristic data from a plurality of values of the average synchronous electrical signal and comparing the large extracted characteristic data with a threshold value set as a limit value; and a unit that prompts a user for an alarm if the limit value is exceeded.

Disclosure of Invention

Technical problem to be solved by the invention

Patent document 1 proposes a method of: in an electromechanical system driven by an asynchronous induction motor, the angular displacement of a rotating shaft is associated with various electrical data such as current and voltage of the motor, the angle of the rotating shaft is divided into a plurality of ranges, an average value in the range is calculated, an average synchronous electric signal is obtained, and then the average synchronous electric signal is processed and analyzed to output an alarm. Further, it is necessary to sample various sensor data such as current and voltage in synchronization with the angular displacement of the rotating shaft, and since these require high-speed processing, specialized equipment is required. Therefore, there is a problem that the device structure becomes complicated and expensive.

Therefore, a technique capable of managing the operation state of the device without complicating the configuration is desired.

Means for solving the problems

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a data acquisition method using an inverter for controlling a synchronous motor, in which a position and speed calculation unit of the inverter calculates an electrical angle of the synchronous motor from a current value between the synchronous motor and the inverter, and samples internal data in the inverter for controlling the synchronous motor in synchronization with information on the electrical angle to acquire data for each electrical angle.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a data acquisition method, an inverter, and a rotating electrical machine capable of providing a predictive monitoring means of an electromechanical system with a minimum equipment configuration.

Drawings

Fig. 1 is a block diagram of an electromechanical system using a rotating electric machine assembly to which an embodiment of the present invention is applied.

Fig. 2 is an external view of the rotating electric machine assembly of the present embodiment.

Fig. 3 is a system configuration view of driving the reciprocating compressor by the rotating electric machine assembly of the present embodiment.

Fig. 4 is a graph showing torque characteristics of the reciprocating compressor of the present embodiment for 1 cycle of the compression step.

Fig. 5 is a diagram showing the relationship between the mechanical shaft angle, the motor shaft angle, and the electrical angle in the present embodiment.

Fig. 6 is a graph showing the relationship between the mechanical axis angle, the motor axis angle, and the electrical angle for 1 cycle of the compression step in the reciprocating compressor of the present embodiment.

Fig. 7 is a graph showing the relationship between the electrical angle and the number of sampling data in 1 cycle of the compression step in this example.

Fig. 8 is a diagram showing the sampling of the synchronization data stored in the monitoring data storage unit 110 of the present embodiment and the storage method thereof.

Fig. 9 is an example of synchronous sampling data of the present embodiment, and is a diagram showing a relationship of torque characteristics.

Fig. 10 is a diagram showing the relationship between various synchronous sampling data and the machine shaft angle for 1 cycle of the load machine of the present embodiment.

Fig. 11 is a block diagram showing the structure of an electromechanical system using another rotating electric machine assembly according to the present embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.