JP2000214922A - Abnormality diagnosing method for motor driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality diagnostic method for a motor driving device capable of analyzing an abnormality cause when abnormality occurs. SOLUTION: When abnormality is detected in a step S1, the abnormality factor is decided in a step S5, abnormality contents, e.g. an error number are stored in a nonvolatile memory in a step S6, abnormality diagnostic data stored in a RAM is further traced back from a RAM pointer and stored in the nonvolatile memory in a step S7, and the processing of this cycle is finished. It is possible to confirm the contents of the abnormality that takes places and the occurrence cause by reading the abnormality contents and the abnormality diagnostic data stored in the nonvolatile memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for diagnosing an abnormality in a motor drive device.

[0002]

2. Description of the Related Art Conventionally, there is a method in which when an abnormality of a motor drive device is detected, a CPU determines the cause of the abnormality and stores the details of the abnormality in a nonvolatile memory.

A conventional method for diagnosing an abnormality in a motor driving device will be described with reference to FIG.

First, when the CPU detects an abnormality in step S8, the CPU determines the cause of the abnormality in step S9, stores the content of the abnormality, for example, an error number in the nonvolatile memory 6 in step S10, and ends the processing in this cycle.

By reading out the contents of the abnormality stored in the non-volatile memory later, the contents of the abnormality that has occurred can be confirmed as an error history.

[0006]

However, in the above-described conventional configuration, it is possible to confirm the details of the error that has occurred by reading the nonvolatile memory, but data indicating the circumstances that led to the occurrence of the error remains. Therefore, there is a problem that it is difficult to analyze the cause of the occurrence of the abnormality.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of diagnosing an abnormality of a motor drive device which can analyze the cause of an abnormality when an abnormality occurs.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to store the contents of an abnormality and data at an arbitrary designated address in a non-volatile memory when an abnormality is detected by a CPU. In addition, the cause of the occurrence of the abnormality can be analyzed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the present invention is characterized in that when an abnormality is detected by a CPU, the contents of the abnormality and data at an arbitrary designated address are stored in a nonvolatile memory. This is a method for diagnosing an abnormality of the motor driving device.

The data is thinned out and stored by specifying a cycle in advance.

As described above, by storing data at an arbitrary address designated in advance in the non-volatile memory, it is possible to store data useful for analyzing an abnormality in the non-volatile memory if an appropriate address is specified. Become.

By thinning out data by designating a cycle in advance, the time area of data to be stored can be expanded even in the same nonvolatile memory area as compared with the case where data is accumulated every time in one cycle. Thus, it is possible to perform an abnormality analysis on a wider range of data.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
Will be described together.

In the figure, 2 is a main circuit, 4 is a drive command circuit, 5 is a CPU, 6 is a nonvolatile memory, 7 is a RAM,
The motor drive device 1 is configured. These structures are the same as those of a conventionally known motor driving device. First, the operation when no abnormality has occurred will be described.

If no abnormality is detected in step S1, the CPU 8 reads an address designated in advance in step S2. Here, the address specified in advance can be changed as a parameter. If no abnormality has occurred, the data on the address specified in step S3 is stored in the RAM as abnormality diagnosis data. In step S4, the RAM pointer of the storage destination is moved for the next cycle, and processing in this cycle is performed. To end.

The RAM 7 is used as a ring buffer. When the RAM pointer reaches the end of the storage area, the RAM pointer is returned to the head of the storage area so that data can be continuously stored in the RAM. I have.

Next, the operation when an abnormality occurs will be described. When an abnormality is detected in step S1, the cause of the abnormality is determined in step S5, and in step S6, the content of the abnormality, for example, an error number is stored in the nonvolatile memory 6, and the RA
The abnormality diagnosis data stored in M is traced back from the RAM pointer, and is stored in the non-volatile memory in step S7, and the processing in this cycle is ended. Confirmation of the content of the error that has occurred and the cause of the error can be performed by reading the error content and the error diagnosis data stored in the nonvolatile memory 6.

Next, a specific example of specifying data to be stored will be described.

When an overvoltage abnormality occurs in the motor driving device, an address in which the motor speed is stored is designated as a storage address. Normally, an overvoltage abnormality is generated due to insufficient regenerative processing capacity during regeneration from the motor. Therefore, when an overvoltage abnormality occurs, it is expected that the motor is rotating. If the motor speed stored at the time of occurrence of an overvoltage abnormality is zero or a minute value, the cause of the overvoltage abnormality is not the regeneration from the motor, but the voltage of the power supply to which the motor drive is connected. Can be analyzed.

When an overcurrent abnormality occurs in the motor drive device, an address at which the motor current value is stored is designated as a storage address. When an overcurrent abnormality occurs, an excessively large motor current value should be detected, but if the motor current value is not at a level that leads to overcurrent, the overcurrent detection sensor incorrectly detects due to noise or other factors. It can be analyzed whether or not it has been done.

When the motor driving device causes an overheating abnormality, an address in which the motor current value and the torque command value are stored is designated as a storage address, and a data accumulation period is set long. When overheating occurs, it is expected that the motor current or torque command will be continued for a long period, but if it is not in such a state, the sensor for overheating abnormality detection may have erroneously detected due to noise or other factors. Can be analyzed for

Although not described in the above embodiment, since the storage address can be arbitrarily specified, not only the address on the RAM as in the above example but also a register of a peripheral IC such as a UART or a timer counter, etc. Input / output ports and the like can be specified as storage addresses, and it is possible to analyze communication disconnection detection, soldering failure, and the like in detail.

[0023]

As is clear from the above embodiment, according to the present invention, the cause of the abnormality can be analyzed by reading the data stored in the non-volatile memory. The time domain of the data can be expanded, and anomaly analysis can be performed on a wider range of data.

[Brief description of the drawings]

FIG. 1 is a flowchart of an abnormality diagnosis method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between addresses.

FIG. 3 is a configuration diagram of a motor drive device.

FIG. 4 is a flowchart of a conventional motor drive device abnormality diagnosis method.

[Explanation of symbols]

 5 CPU 6 Non-volatile memory

Claims (2)

[Claims] 1. A method for diagnosing an abnormality in a motor drive device, comprising: when an abnormality is detected by a CPU, storing the contents of the abnormality and data at an arbitrary address specified in advance in a nonvolatile memory. 2. The abnormality diagnosis method for a motor drive device according to claim 1, wherein the data is thinned out and stored by specifying a cycle in advance.