JPH09300175A - Method and apparatus for determining abnormality in processing device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide an abnormality determination method and apparatus for a processing device
A method and an apparatus for determining an abnormality in a processing device for detecting an abnormality in a transmission system of the processing device. SOLUTION: A CPU 110 sends control command data to an output processing circuit 104, separates a grindstone 12 from a work and rotates it by a predetermined number, and then switches a motor 10 to an idle or braking state. Further, the internal timer 116 is started together with the operation of the rotation speed sensor 20. Further, the input processing circuit 106 acquires the rotation speed data of the grindstone shaft 14 sent from the rotation speed sensor 20 when the time started by the internal timer 116 reaches the inspection timing. Then, it is determined whether it is normal or abnormal depending on whether the acquired change pattern of the rotation speed is within the allowable range. Therefore, it is possible to detect an abnormality in the transmission system due to slippage, mechanical friction, etc., and it is possible to reliably prevent a failure in the transmission system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing apparatus abnormality determination method and apparatus, and more particularly to a technique for determining whether or not an abnormality has occurred in a transmission system of the processing apparatus.

[0002]

2. Description of the Related Art As shown in FIG. 5, a rotational force generated by an electric motor (hereinafter referred to as "motor") 300 is transmitted to a transmission system 302.
There is a processing device that transmits to the rotating body for processing 304 via, and causes the rotating body for processing 304 to come into contact with the work 306 while rotating to perform processing. In the processing apparatus, the current control unit 308 detects the number of rotations of the processing rotating body 304, and controls the current supplied to the motor 300 to realize constant-speed rotation. In such a system, if there is torque fluctuation due to slippage or mechanical friction in the transmission system, the current value required to rotate the machining rotor 304 at a constant speed becomes abnormal. Therefore, it seems that it is possible to determine whether or not an abnormality has occurred in the transmission system based on the abnormal current value. However, the torque fluctuation between the machining rotary body 304 and the work 306 is larger than the torque fluctuation due to mechanical friction or the like. For this reason, in the method of monitoring the current value, it is difficult to discriminate an abnormality occurring in the transmission system.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a method and apparatus for determining an abnormality in a processing apparatus for detecting an abnormality in a transmission system of the processing apparatus. It is to be.

[0004]

According to a first aspect of the present invention, there is provided a drive source for generating a rotational force and a transmission system for transmitting the rotational force to a processing rotary body, and the processing rotation is provided. In a processing device that performs processing by bringing a body into contact with a workpiece while rotating, a method for determining whether or not an abnormality has occurred in the transmission system, in which the processing rotating body is separated from the workpiece. To forcibly rotate by a predetermined number of times, and the step of switching the drive source to the non-forced rotation state, and after changing the drive source to the non-forced rotation state, the change pattern of the rotation speed of the processing rotor is within the allowable width. Depending on whether or not
And a step of determining whether or not an abnormality has occurred in the transmission system of the processing apparatus. According to the invention described in claim 1, after changing the rotating body for processing from the work piece by forcibly rotating by a predetermined number and switching the drive source to the non-forced rotation state, the change pattern of the rotating speed of the rotating body for processing is changed. to see. Then, depending on whether or not this change pattern is within the allowable width,
It is determined whether or not an abnormality has occurred in the transmission system of the processing device. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[0005]

According to a second aspect of the present invention, a rotating force generated by an electric motor is transmitted to a machining rotary body via a transmission system, and the machining rotary body is rotated to rotate the workpiece. A method for determining an abnormality of a transmission system in a processing apparatus that abuts against a workpiece to perform processing, wherein the processing rotating body is rotated a predetermined number apart from a workpiece. The process, the step of switching the electric motor to the braking state, and the step of switching the electric motor to the braking state, and whether or not the change pattern of the back electromotive force generated in the electric motor is within the allowable width, And a step of determining whether or not an abnormality has occurred. According to the second aspect of the invention, the change pattern of the back electromotive force generated in the electric motor is observed after the machining rotary body is separated from the workpiece and rotated by a predetermined number to switch the electric motor to the braking state. Then, it is determined whether or not an abnormality has occurred in the transmission system of the processing device depending on whether or not this change pattern is within the allowable width. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[0006]

According to a third aspect of the present invention, there is provided a drive source for generating a rotational force and a transmission system for transmitting the rotational force to a processing rotary body, and the processing rotation is provided. In a machining device that performs machining by bringing a body into contact with a workpiece while rotating, a transmission system abnormality determination device that determines whether or not an abnormality has occurred in the transmission system, and separates the machining rotary body from the workpiece. Rotation control means for forcibly rotating by a predetermined number, and switching means for switching the drive source to a non-forced rotation state,
After switching the drive source to the non-forced rotation state by the switching means, it is determined whether or not an abnormality has occurred in the transmission system of the processing device depending on whether or not the change pattern of the rotation speed of the processing rotating body is within the allowable width. It has a discriminating means for discriminating. According to the invention described in claim 3, the rotation control means separates the processing rotary body from the work piece by force to rotate by a predetermined number, the switching means switches the drive source to the non-forced rotation state, and the determination means rotates for processing. See the pattern of changes in body speed. Then, depending on whether or not this change pattern is within the allowable width, the determination means determines whether or not an abnormality has occurred in the transmission system of the processing apparatus. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[0007]

According to a fourth aspect of the present invention, a rotating force generated by an electric motor is transmitted to a machining rotary body via a transmission system, and the machining rotary body is rotated to rotate the workpiece. In a processing device that abuts against a workpiece to perform processing, a transmission system abnormality determination device that determines whether or not an abnormality has occurred in the transmission system, and rotates the processing rotating body by a predetermined number apart from the work. Rotation control means, switching means for switching the electric motor to the braking state, and after switching the electric motor to the braking state by the switching means, depending on whether or not the change pattern of the back electromotive force generated in the electric motor is within the allowable width, It is characterized by having a determining means for determining whether or not an abnormality has occurred in the transmission system of the processing apparatus. According to the invention described in claim 4, the rotation control means rotates the machining rotary body away from the work by a predetermined number, the switching means switches the electric motor to the braking state, and the discrimination means generates the counter electromotive force in the electric motor. See the change pattern of. Then, depending on whether or not this change pattern is within the allowable width, the determination means determines whether or not an abnormality has occurred in the transmission system of the processing apparatus. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. One form is processing in which the rotational force generated by the drive source (motor) is transmitted to the processing rotating body (grinding stone) via the transmission system, and the processing rotating body is rotated and brought into contact with the workpiece for processing. The present invention is applied to a device.

First, regarding the configuration of the processing apparatus of the present invention,
This will be described with reference to FIG. As shown in FIG. 1, the processing device includes a motor 10, a grindstone 12, a grindstone shaft 14, and an abnormality detection device 100. The motor 10 is a device that embodies a drive source, and is an abnormality detection device 10 described later.
Rotation control is performed by 0. A pulley 24 is provided on the main shaft of the motor 10. The grindstone shaft 14 is rotatably supported by a bearing 16 such as hydraulic pressure, and a pulley 18 is provided on one end side thereof. These pulleys 18,
A belt 22 for transmitting rotation is stretched between 24. On the other end side of the grindstone shaft 14, a grindstone 12 embodying a processing rotary body is provided. A rotation speed sensor 20 for detecting the rotation speed of the grindstone shaft 14 is provided near one end of the grindstone shaft 14. For the rotation speed sensor 20, for example, a light beam sensor as a non-contact sensor is used. The rotation speed sensor 20 includes
A contact type sensor (for example, a pulse generator or the like) may be used. Further, the grindstone shaft 14, the bearing 16, and the belt 22 are elements of the transmission system. With this configuration, the rotational force generated by the motor 10 is transmitted to the grindstone 12 via the transmission system (the grindstone shaft 14, the bearing 16, and the belt 22) so that the grindstone 12 is rotated and applied to the workpiece (not shown). A polishing process can be performed by bringing them into contact with each other.

Next, the abnormality detecting device 100 includes a CPU (processor) 110, a ROM 102, a RAM 112, an output processing circuit 104, an input processing circuit 106, an operation panel 108,
It is composed of a display control circuit 114 and an internal timer 116. The CPU 110 controls the entire processing apparatus according to the processing control program stored in the ROM 102. This processing control program includes an abnormality detection program described later. In the RAM 112, a data table for setting an allowable rotation speed corresponding to a predetermined time,
The number of revolutions of the grindstone shaft 14 and the like are stored. Generally, ROM1
02 is an EEPROM, and RAM 112 is D
RAM is used. The ROM 102 and the RAM 11
The storage medium 2 is not limited to these storage media, and other storage media such as a flash memory or an external storage device may be used.

The output processing circuit 104 receives the control command data sent from the CPU 110 through the bus 118, converts it into a voltage or current for driving / stopping the motor 10 and outputs it to the motor 10, or a rotation speed sensor. Activate 20. The output processing circuit 104 embodies a rotation control means and a switching means, and forcibly rotates the motor 10 by a predetermined number, or non-forced rotation of the motor 10 (specifically, idling or braking). Switch to state.
The input processing circuit 106 receives the rotation speed data (or pulse signal or the like) sent from the rotation speed sensor 20, converts it into a data format that can be processed in the abnormality detection device 100, and converts the data into a CPU.
110 and RAM 112. The internal timer 116 is
When the drive command data sent from the CPU 110 via the bus 118 is received, the time measurement is newly started. The operation panel 108 is used by the operator to input a predetermined command to the abnormality detection device 100, and for example, a keyboard is used. The display control circuit 114 receives the display command data sent from the CPU 110 through the bus 118 and causes the display device 114a to display the command data and the like. A display lamp is used for the display device 114a, but other display media such as a CRT or a liquid crystal display device may be used.
Each of the above components is connected to the bus 118.

Regarding the processing procedure for finding an abnormality in the transmission system in the processing apparatus configured as described above,
This will be described with reference to FIGS. Here, FIG. 2 shows a flowchart showing the abnormality detection processing. This abnormality detection processing is a concrete embodiment of the determination means, and is realized by the operator operating the operation panel 108 and the CPU 110 executing the abnormality detection program. FIG. 3 shows a data table for setting the allowable rotation speed corresponding to a predetermined time. FIG. 4 shows a change pattern of the rotational speed of the grindstone shaft 14.

In FIG. 2, first, control command data is sent from the CPU 110 to the output processing circuit 104 through the bus 118, the grindstone 12 is separated from the work and forcedly rotated by a predetermined number, and then the motor 10 is switched to an idle state ( Step S10). Then, the rotation speed sensor 20 is started to operate (step S12), and the internal timer 116 is started (step S14). Next, step S
It waits until the time when the internal timer 116 starts counting from 12 reaches the inspection timing (time t2, t4, ..., T12, etc.) (step S16), and when the time t2 is reached, the rotation sent from the rotation speed sensor 20. The input processing circuit 106 acquires the numerical data (step S18). The inspection timing is as shown in FIG.
It is preset to 00. Then, it is determined whether the rotation speed acquired in step S18 (hereinafter referred to as “acquisition rotation speed”) is within the allowable range to determine whether it is normal or abnormal (step S22). Specifically, it is determined whether the rotation speed is normal or abnormal depending on whether the rotation speed is within the allowable rotation speed of the data table 200 (that is, between the minimum rotation speed and the maximum rotation speed).

Then, according to the determination result of step S22, when the acquired rotation speed is within the allowable range, it is determined to be normal, and for other inspection timings, step S1
6, S18 and S22 are repeated (step S20). Further, if the allowable width is also obtained at other inspection timings, no abnormality is displayed on the display device 114a (step S24), and this processing is ended. On the other hand, step S
According to the determination result of No. 22, if the acquired rotation speed is larger than the permissible range, it is determined to be abnormal, and an abnormality of the looseness of the belt 22 is displayed on the display control circuit 114 (step S26), and this processing ends. Similarly, when the acquired rotation speed is smaller than the allowable width, it is determined that the abnormality has occurred, the abnormality of the grindstone shaft 14 is displayed on the display control circuit 114 (step S28), and the present process is terminated.

Now, let us consider the variation pattern of the rotational speed of the grindstone shaft 14 shown in FIG. The range of the rotational speed under normal conditions is the range surrounded by the change patterns p4 and p8 indicated by the wavy lines in the figure. For example, step S at time t2
In 22, if the acquired rotation speed is between the rotation speed r2b (upper limit) and the rotation speed r2d (lower limit), it is determined to be normal, and outside the range is determined to be abnormal. Therefore, in the case of the change pattern p6 indicated by the solid line, it is determined that the rotation speed r2c is normal,
Similarly, the change patterns p2 and p6 are respectively the rotational speed r2.
It is determined to be abnormal by a and r2e. By performing such discrimination at each inspection timing (time t2, t4, ..., T12, etc.), it is possible to reliably detect an abnormality in the transmission system. It should be noted that the inspection timing is not limited to a plurality of times and may be inspected at only one time as long as it is possible to reliably detect whether or not an abnormality has occurred. For example, in the case of the change pattern of FIG. 4, if the abnormality determination is performed at time t12, the belt 22
It is possible to discover whether or not the looseness has occurred.

Therefore, according to the above-described processing apparatus, the grindstone shaft 14 (machining rotary member) is forcibly rotated by a predetermined number apart from the work, and the motor 10 (driving source) is switched to the idle state. Look at the change pattern of the rotational speed of 14. Then, it is determined whether or not an abnormality has occurred in the transmission system of the processing device depending on whether or not this change pattern is within the allowable width. Therefore, it is possible to detect an abnormality in the transmission system due to slippage or mechanical friction. Thus, the failure of the transmission system can be surely prevented. Note that FIG.
Although the motor 10 is switched to the idling state in step S10 shown in (1), the motor 10 may be switched to the braking state.
Further, in step S22, it is determined whether or not an abnormality has occurred based on the rotation speed of the grindstone shaft 14, but whether or not an abnormality has occurred based on the value of the back electromotive force generated in the motor 10 that has switched to the braking state is determined. You may decide. Similarly, the motor 10
Whether or not an abnormality has occurred may be determined based on the value of the voltage / current supplied to the. In these cases, only the specific values of the inspection timing and the allowable width are changed, and the above-mentioned effects can be substantially obtained.

[Other Embodiments] The above-described processing apparatus abnormality determination method and the structure, shape, size, material, number, arrangement, operating conditions, etc. of the other parts of the apparatus are limited to the above-described embodiment. Not something that is done. For example, each of the following modes to which the above-described embodiment is applied can be implemented. (1) Although the motor 10 is used as the drive source, other drive sources that generate rotational force, such as an engine, can be similarly applied. For example, when the present invention is applied to an automobile, when transmitting the rotational force generated in the engine to the wheels via a transmission system such as a propeller shaft, an abnormality in the transmission system can be detected. Although the grindstone 12 is used as the processing rotary body, the present invention can be similarly applied to various rotary bodies such as cutting and grinding tools and wheels. Further, instead of the pulleys 18, 24 and the belt 22, gears can be applied. According to this aspect, also in the rotary drive device that includes the drive source that generates the rotational force and the transmission system that transmits the rotational force to the rotary body, and that rotates the rotary body,
It is possible to determine whether or not an abnormality has occurred in the transmission system. (2) When the abnormality detection process shown in FIG. 2 is executed, it is determined as abnormal if the allowable width exceeds the allowable width even once in step S20 at a plurality of inspection timings, but when the allowable width exceeds the predetermined number of times. It may be possible to add a process for discriminating an abnormality. Alternatively, step S20
If it is determined to be abnormal in, a process of performing a reinspection may be added. According to this aspect, even if incorrect rotation speed data is generated due to a malfunction of the rotation speed sensor 20 or the like, it is possible to accurately detect an abnormality in the transmission system due to slippage, mechanical friction, or the like.

(3) Further, in the abnormality detecting process shown in FIG. 2, the normal / abnormal state is discriminated by whether or not the change pattern of the rotation speed is within the allowable range. The determination method is not limited to this, and the determination may be made based on whether the change pattern of the current flowing through the motor 10 is within the allowable width. For example, a current sensor that detects the current flowing through the motor 10 is provided, and it is determined whether or not the value of the current detected by the current sensor is within the allowable range. According to this aspect, it is possible to accurately detect an abnormality in the transmission system due to slippage or mechanical friction based on the change pattern of the current flowing through the motor 10. (4) Similarly, it may be determined whether or not the rate of change of the rotation speed is within the allowable range. For example, it is determined whether or not the rate of change of the rotational speed of the grindstone shaft 14 at a predetermined inspection timing is within the allowable range. According to this aspect, only the allowable range of the rate of change needs to be set in advance, and a large amount of reference data like the data table 200 is not required.

(5) The time and the allowable number of revolutions of the data table 200 shown in FIG. 3 are set to normal values in advance, but a process to be updated when the abnormality detection process shown in FIG. 2 is executed is added. You may. For example, the number of rotations of the grindstone shaft 14 determined to be abnormal in step S20 is displayed on the display device 114a.
It is displayed on (CRT, etc.) and the operator is inquired as to whether or not it is determined to be abnormal. Then, when the normal instruction is received from the operator, the allowable rotation speed corresponding to the corresponding time in the data table 200 is updated. This inquiry processing may be performed in parallel during execution of the abnormality detection processing, or may be performed collectively after completion of the abnormality detection processing. According to this aspect, the time and the allowable number of revolutions set in the data table 200 are appropriately updated, so that an abnormality in the transmission system due to slippage, mechanical friction, or the like can be detected more accurately. (6) Rotate the rotating body by a predetermined number in an unloaded state,
It may be possible to determine whether or not an abnormality has occurred in the transmission system of the rotary drive device depending on whether or not the current flowing through the drive source in the rotation state is within the allowable width. For example,
A current sensor for detecting the current flowing through the motor 10 rotating a predetermined number is provided, and it is determined whether or not the value of the current detected by the current sensor is within the allowable range. According to this aspect, it is possible to immediately detect an abnormality in the transmission system due to slippage, mechanical friction, or the like, based on the current flowing through the motor 10. Further, it is possible to quickly determine the abnormality of the transmission system simply by rotating the rotating body in the unloaded state.

[0020]

Other Embodiments The embodiments of the present invention have been described above. This embodiment has aspects of the invention other than the aspects of the invention described in the claims.
Embodiments of the present invention will be enumerated below, and related explanations will be provided as necessary.

[Mode 1] In a rotary drive device that includes a drive source that generates a rotational force and a transmission system that transmits the rotational force to a rotating body, and whether an abnormality has occurred in the transmission system, in a rotary drive device that rotates the rotating body. A method of determining whether a transmission system is abnormal, which includes the steps of forcibly rotating the rotating body by a predetermined number in an unloaded state, switching the drive source to a non-forced rotation state, and non-forced rotation of the drive source. After switching to the state, a step of determining whether or not an abnormality has occurred in the transmission system of the device depending on whether or not the change pattern of the rotation speed of the rotating body is within the allowable width, the rotation characterized by the above-mentioned. A drive device abnormality determination method. [Related Explanation of Aspect 1] According to Aspect 1, after the rotating body is forcibly rotated by a predetermined number in the unloaded state and the drive source is switched to the non-forced rotation state, the change pattern of the rotational speed of the rotating body is viewed. Then, it is determined whether or not an abnormality has occurred in the transmission system of the rotary drive device depending on whether or not this change pattern is within the allowable width. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[Mode 2] A transmission system for transmitting a rotational force generated by an electric motor to a rotating body via a transmission system and rotating the rotating body to determine whether or not an abnormality has occurred in the transmission system. The method for determining abnormality in No. 1, wherein the step of rotating the rotating body away from the work by a predetermined number of steps, the step of switching the electric motor to the braking state, and the step of switching the electric motor to the braking state and then the counter-electromotive force generated in the electric motor. And a step of determining whether or not an abnormality has occurred in the transmission system of the processing apparatus depending on whether or not the change pattern of the electric power is within the allowable range. [Related Explanation of Aspect 2] According to Aspect 2, after rotating the rotating body by a predetermined number in the unloaded state and switching the electric motor to the braking state, the change pattern of the rotating speed of the rotating body is viewed.
Then, it is determined whether or not an abnormality has occurred in the transmission system of the rotary drive device depending on whether or not this change pattern is within the allowable width. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[Mode 3] In a rotary drive device that includes a drive source that generates a rotational force and a transmission system that transmits the rotational force to a rotating body, and whether an abnormality has occurred in the transmission system, An abnormality determining device for a transmission system for determining whether the rotating body is forcibly rotated by a predetermined number in a no-load state, a switching means for switching a drive source to a non-forced rotation state, and a drive source for the drive source. After switching to the non-forced rotation state, it is possible to determine whether or not an abnormality has occurred in the transmission system of the rotary drive device depending on whether or not the change pattern of the rotation speed of the rotating body is within the allowable width. An abnormality determination device for a rotation drive device, which is characterized in that: [Related Explanation of Aspect 3] According to Aspect 3, the rotation control means separates the rotating body from the work piece by forcible rotation, the switching means switches the drive source to the non-forced rotation state, and the determining means determines that the rotating body is Look at the change pattern of the rotation speed.
Then, depending on whether or not this change pattern is within the allowable width, the determining means determines whether or not an abnormality has occurred in the transmission system of the rotary drive device. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[Mode 4] A transmission system for transmitting a rotational force generated by an electric motor to a rotating body via a transmission system and rotating the rotating body to determine whether or not an abnormality has occurred in the transmission system. An abnormality determination device of the above, wherein the rotation control means for rotating the rotating body away from the work by a predetermined number, the switching means for switching the electric motor to the braking state, and the electric motor generated after switching the electric motor to the braking state. An abnormality of the rotary drive device, comprising: a determination unit that determines whether or not an abnormality has occurred in the transmission system of the rotary drive device depending on whether or not the change pattern of the back electromotive force is within the allowable range. Discriminator. [Related Description of Aspect 4] According to Aspect 4, the rotation control means separates the rotating body from the work and rotates the rotating body by a predetermined number,
The switching unit switches the electric motor to the braking state, and the determination unit looks at the change pattern of the back electromotive force generated in the electric motor.
Then, depending on whether or not this change pattern is within the allowable width, the determining means determines whether or not an abnormality has occurred in the transmission system of the rotary drive device. In this way, an abnormality in the transmission system due to slippage or mechanical friction can be found.

[0025]

According to the present invention, it is possible to detect an abnormality in the transmission system due to slippage or mechanical friction.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of the present invention.

FIG. 2 is a flowchart showing an abnormality detection process.

FIG. 3 is a data table in which an allowable rotation speed corresponding to a predetermined time is set.

FIG. 4 is a diagram showing a change pattern of the number of rotations of a rotating body.

FIG. 5 is a block diagram showing a configuration of a conventional processing apparatus.

[Explanation of symbols]

 10 Motor (Drive Source) 12 Grindstone (Rotating Body for Processing) 14 Grindstone Shaft (Transmission System) 16 Bearing (Transmission System) 18, 24 Pulley 20 Rotation Speed Sensor 22 Belt (Transmission System) 100 Abnormality Detection Device 200 Data Table

Claims (4)

[Claims] 1. A processing apparatus comprising a drive source for generating a rotational force and a transmission system for transmitting the rotational force to a processing rotary body, and performing processing by bringing the processing rotary body into contact with a workpiece while rotating. In the transmission system abnormality determination method for determining whether or not an abnormality has occurred in the transmission system, including the step of forcibly rotating the machining rotor by a predetermined number of distances from the workpiece, and the drive source not being forcibly rotated. After the process of switching to the state and after switching the drive source to the non-forced rotation state, whether the transmission system of the processing device has an abnormality depending on whether the change pattern of the rotation speed of the processing rotor is within the allowable width. And a step of determining whether or not the processing apparatus has an abnormality determination method. 2. A machining apparatus for performing machining by transmitting a rotational force generated by an electric motor to a machining rotary body via a transmission system and bringing the machining rotary body into contact with a workpiece while rotating the machining rotary body,
A method for determining an abnormality of a transmission system for determining whether or not an abnormality has occurred in the transmission system, the method including a step of rotating the machining rotary body away from a work by a predetermined number, and a step of switching an electric motor to a braking state, After switching the electric motor to a braking state, a step of determining whether or not an abnormality has occurred in the transmission system of the processing device depending on whether or not the change pattern of the back electromotive force generated in the electric motor is within the allowable width, An abnormality determination method for a processing apparatus, comprising: 3. A processing apparatus that includes a drive source that generates a rotational force and a transmission system that transmits the rotational force to a machining rotary body, and performs machining by bringing the machining rotary body into contact with a workpiece while rotating the machining rotary body. In a transmission system abnormality determining device for determining whether or not an abnormality has occurred in the transmission system, the rotation control means for forcibly rotating the processing rotating body away from the work by a predetermined number, and the drive source After switching the drive source to the non-forced rotation state by the switching means for switching to the forced rotation state, the transmission of the processing device is determined by whether or not the change pattern of the rotation speed of the processing rotary body is within the allowable width. An abnormality determination device for a processing device, comprising: a determination unit that determines whether or not an abnormality has occurred in the system. 4. A machining apparatus for performing machining by transmitting a rotational force generated by an electric motor to a machining rotary body via a transmission system and bringing the machining rotary body into contact with a workpiece while rotating the machining rotary body.
A transmission system abnormality determination device for determining whether or not an abnormality has occurred in the transmission system, wherein rotation control means for rotating the processing rotary body away from the work by a predetermined number and switching for switching the electric motor to a braking state Means and whether or not there is an abnormality in the transmission system of the processing device, depending on whether the change pattern of the back electromotive force generated in the electric motor is within the allowable range after the electric motor is switched to the braking state by the switching means. An abnormality determination device for a processing device, comprising: a determination unit that determines