JPH1090011A - Visual display method of load meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display method whereby an operation state of a motor can be promptly detected in real time. SOLUTION: A coordinate screen is displayed on a display screen of a display apparatus, in which revolutions of a motor are shown on an axis of abscissa and a motor output is indicated on an axis of ordinate. Operation output characteristic curves S1, S2 determined by an international standard, etc., are displayed on the coordinate screen. Current revolutions of the motor and a current motor output are detected, and a load meter value is found. A marker M' is displayed at a position corresponding to the motor revolutions and load meter value on the coordinate screen. In this manner, the current operation state of the motor is displayed by the marker M' together with the operation output characteristic curves of the motor, and therefore can be grasped easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a load meter that indicates an operating state of a motor. In particular, it relates to a display method of a load meter.

[0002]

2. Description of the Related Art Conventionally, the operation status of a motor is indicated by a load meter. The load meter monitors the output from the motor amplifier and displays the output voltage on the meter as it is, or obtains the maximum output (voltage) corresponding to the rotation speed from the motor rotation speed at that time, and detects the detected output voltage. And a method of displaying the ratio of the maximum output (voltage) to the percentage (display of a load meter value). Further, a method of displaying the load meter value and the motor rotation speed at that time on a display device of a control device as a numerical value, a bar graph, or the like is also adopted.

[0003]

As described above, in the conventional method for displaying the operating status of the motor, the voltage or the load meter value detected from the amplifier and the motor speed are displayed separately, so that the detection is not possible. It is difficult to grasp in real time which part of the output characteristic diagram of the motor the motor is operating by comparing the voltage, rotation speed and output characteristic diagram. SUMMARY OF THE INVENTION An object of the present invention is to provide a visual display method of a load meter, which can grasp the operating state of a motor immediately in real time.

[0004]

According to the present invention, a load meter value is displayed on a display device provided in a control device for controlling a motor or a control device such as a personal computer, and the output torque and rotation speed of the motor are measured. Detects and obtains a load meter value, displays a coordinate screen in which one axis is the motor rotation speed and the other axis is the motor output on the display screen of the display device, and sets the operation output characteristic curve of the motor set in the coordinate screen. In addition, a marker is displayed at the detected rotational speed and the coordinate position of the load meter value, so that the operating state of the motor can be immediately grasped.

[0005]

FIG. 1 is a block diagram showing a main part of an embodiment of the present invention. Reference numeral 10 denotes a CNC (numerical control device with a built-in computer) or a personal computer for controlling a motor. In this embodiment, an example of the CNC 10 is shown.

The CNC 10 comprises a processor 11 for controlling the entire CNC device, a ROM 12 for storing a system program and the like, and a part of the nonvolatile RAM.
A RAM 13 for storing operation programs and various set values of a machine controlled by the CNC 10 and used for various calculations,
A keyboard 14 for inputting data and the like, a graphic display device 15 and a motor control device 16 are connected by a bus 17. In addition, a hard disk driver, a floppy disk driver, an interface circuit for connecting to other devices, and the like are also connected, but they are omitted in FIG. 1 because they are not directly related to the present invention. Further, although only one motor control device 16 is illustrated, if the machine to be controlled is a machine tool, a motor control device for driving a spindle motor, a servomotor for each feed shaft, and the like is connected by a bus. 1, only one is shown and the others are omitted.

The motor control device 16 includes a motor 20
(In FIG. 1, the motor 20 is used as a spindle motor.) A speed detector 21 is attached to the motor 20 and the detected speed is fed back to the motor control device 16. Speed is feedback controlled.

The non-volatile portion of the RAM 13 has a motor operating output (Kw) on a horizontal axis and a motor output (Kw) on a horizontal axis determined by the international standard IEC34 as shown in FIG. The characteristic curve is set and stored in accordance with the operating characteristics of the motor. In the example shown in FIG. 2, among the operation output characteristic curves of S1 to S9 of the international standard IEC34,
Output characteristic curve of "S1 Continuous" continuous operation,
It is assumed that the output characteristic curve of the continuous operation for "S2 30min" for 30 minutes is registered and stored. And
When the load meter value is 100%, the operation output characteristic curve of “S1 Continuous” outputs 5.5 Kw, and “S2 30
The operation output characteristic curve of “min” indicates that 7.5 Kw is output.

FIG. 3 is a flowchart of a process executed by the processor 11 when the display screen of the graphic display device 15 is switched to the load meter display screen by operating the keyboard 14 or the like. First, the processor 11 has a RAM
The operation output characteristic curve of the motor registered in the nonvolatile portion 13 is read out and displayed on the graphic display device screen as shown in FIG. 2 (step a1). Next, the processor 11 calculates a maximum output value (voltage) Q of the motor corresponding to the rotation speed based on the speed command value (rotation speed) output to the motor 20 based on the operation program as in the related art. (Step a2). Next, the current rotational speed (speed) n of the motor is read via the motor control device 16 from the speed feedback signal fed back from the speed detector 21 to the motor control device 16 (step a3). Further, the torque command value T output to the amplifier in the motor control device 16 is read (step a4). The motor output torque may be obtained by detecting the motor drive current value. However, since the motor current (torque) is usually controlled by feedback control so as to match the command value, the torque command value T is obtained as the motor output torque. .

Then, the torque command value T obtained in step a4 is divided by the motor maximum output value Q obtained in step a2, a ratio to the maximum value is obtained, and the result is multiplied by 100 to obtain a rotometer value (%) M ( Step a5) The load meter value M is displayed on the coordinate display screen of the motor operation output characteristic curve displayed in step S1, the motor rotation speed on the horizontal axis is the rotation speed n obtained in step S3, and the output value on the vertical axis is step S5.
Is displayed as a mark M 'at the coordinate position of the trotometer value M obtained in step (a6). Next, it is determined whether another screen is selected (step a7),
When the load meter value display screen is selected and entered, the flow returns to step a2 and performs the above-described processing of step a2 and thereafter, and sets the load meter value M on the display coordinate screen of the motor operation output characteristic curve of the international standard IEC34 by the marker M ' Are displayed while sequentially updating.

As described above, the horizontal axis represents the motor rotation speed, the vertical axis represents the motor output, and the current load meter value of the motor is displayed on the coordinate screen of the operation output characteristic curve display together with the operation output characteristic curve of the international standard motor. Is displayed, the current operating status of the motor can be easily grasped visually. In addition, there is no need for other components such as a load meter as in the related art.

[0012]

According to the present invention, the motor rotation speed and the load meter value are displayed as a pair on a coordinate system having the rotation speed and the motor output as coordinate axes, and are displayed together with the motor operation output characteristic curve. The operating status of the motor can be immediately grasped.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a display screen in the embodiment.

FIG. 3 is a flowchart of a motor operation status display process in the embodiment.

[Explanation of symbols]

 Reference Signs List 10 Numerical control unit (CNC) 11 Processor 20 Motor 21 Speed detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Naoshi Maeda 3580 Kobaba, Oshino-mura, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture Inside FANUC Co., Ltd. Inside FANUC CORPORATION

Claims (2)

[Claims] 1. An output torque and rotation speed of a motor are detected to obtain a load meter value, and a coordinate screen is displayed on a display screen of a display device in which one axis is a motor rotation speed and the other axis is a motor output. A visual display method of a load meter, comprising displaying a marker at a coordinate position of the detected rotation speed and the load meter value together with a motor operation output characteristic curve set on a coordinate screen. 2. The visual display method for a load meter according to claim 1, wherein the display device is a control device for controlling the motor or a display device provided in a personal computer.