JPS5960331A - Load torque measuring device - Google Patents

Abstract

PURPOSE:To measure load torque easily with high precision by counting index pulses of a rotating body and calculating the torque from the time differential value of an angular speed. CONSTITUTION:Index pulses of the rotating body 1 to be measured are generated by an index pulse generator and counted by a counter 3, whose counted value is inputted to a CPU5 by clock pulses from a clock 4 to calculate omega. Then, domega/dt is found and the load torque is found from it. Load power, on the other hand, is found from an expression. The index pulses used for the measurement of this kind has an error, etc., actually, which causes a decrease in measurement precision, so data is sampled fast almost at a measurement angular speed and averaging processing (smoothing) is performed to improve the measurement precision.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) 1. Technical Field of the Invention The present invention relates to a load torque measuring device that measures load torque from changes in the rotational speed of a rotating body.

(2) Background of the technology There are times when it is necessary to measure the load torque of a rotating machine. Not, but
It has poor sensitivity at minute torques and cannot be measured using a load machine alone, and there is a need for the development of various technical measures that can solve these technical problems.

(3) Prior Art and Problems An example of a conventional load torque measuring device 6 is shown in FIG. This device has a driving force @α and a load +1M b
A torque converter d including a sensor such as a strain gauge is provided on the shaft C, and the output of the torque converter d is connected to a data processing device e.

In this way, since a dedicated detection section is required, the device suffers a great loss. Furthermore, since it is of a type that detects the torsion of the shaft c, the sensitivity at minute torques is poor, and if the sensitivity is to be increased, a very low-quality shaft must be used.

Furthermore, since the transmitted torque is to be measured, it is impossible to measure the load machine alone, and it is necessary to measure it in combination with the prime mover.

(4) Purpose of the Invention The present invention was devised in view of the drawbacks of the conventional devices as described above, and its purpose is to provide a load torque measuring device that can measure load torque easily and with high accuracy. There is a particular thing.

(5) Configuration 12 of the first invention, the purpose of which is to provide an index pulse generator that generates index pulses according to the rotation of the rotating body to be measured, count the pulses with a counter and calculate the time differential value of the angular velocity, This is achieved by configuring the load torque to be calculated using the time differential value.

(6) Embodiments of the Invention The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 2 shows an embodiment of the invention. 1 is a rotating body to be measured,
For example, in the case of a rotating machine having a built-in electric motor, a means for turning the electric motor on and off, such as a relay 2, is controlled by a central processing unit (hereinafter referred to as CI V) 5, which will be described later. In addition, the rotating body 1 to be measured includes:
An internal or external version is provided with an index pulse generator. Its external attachment is a type example 1d optical sensor.

3 &, i-f is a counter connected to the output of the pulse generator.

The output of counter:3 is CP V along with the output of clock 4.
5, peripheral devices 6 such as a CRT display, a printer, and a printer are connected to this device. Also, C.P.
V5 connects the line 7 that supplies the start pulse to relay 2 to relay 2 (7).

Next, the operation of the apparatus of the present invention having the above configuration will be explained.

Before entering into a detailed description of the device 16', the measurement locations J and IJ+ of the present invention will be explained below.

If the moment of inertia of the rotating body to be measured is J1 and the angular velocity is +II, then the total rotation E is 1 bow = -Jω...
...(1) Represented by: Then, the load power P is dt d
It is expressed as t, and the load torque M is expressed as dt.

The present invention calculates the load torque based on this equation (3). One index pulse is generated from the index pulse generator for each revolution of the rotating body 1 to be measured, and the pulse is sent to the counter 3. The count value is taken into CPv by the clock pulse from clock 4 to calculate 0, and d/)l/tl t
Find the load torque from this. Also, formula (2)
The load power can be found from .

The index pulse used for such measurements actually contains errors, etc., which leads to a decrease in measurement accuracy. Therefore, data is sampled at high speed near the measurement angular velocity and then averaged. l! (Smoothing) By performing all the steps, the degree of shear measurement can be increased.

This process will be explained using FIG. 3. First, the angular velocity of the rotating body 1 to be measured is set to ωl, and then Mif! is set by a signal from the central processing unit 5 at Tf o at the start of measurement. Turn off or disconnect J1 aircraft.

Counter 3 starts operating from time +11 o and transfers count data to CPv5. In that case, dω/dt
When is relatively small, −] double sampling,
Smoothing may also be performed online.

However, if you want to increase the numbering speed, V, CI
) The measured values are loaded into the storage device of V5 and averaged based on the following equation offline.

If we perform this process from ω to O, can we measure the angular velocity-torque (power) characteristics in one measurement? :I can do something.

(7) 0 Effects of the Invention As described above, according to the present invention, a special converter can be used to measure the torque of a rotating body to be measured easily and with high precision. . It is possible to measure minute load torques which are rarely possible with conventional methods. Therefore, a highly flexible measurement system can be realized.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional device, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a time-angular velocity curve diagram. In the figure, 1v is the rotating body to be measured, 21t, l +) v-1
3 is a counter, 4 is a clock source, and 5 is a central processing unit (CPV). Figure 1 Figure 2 Figure 3 Senma

Claims (1)

[Claims] An index pulse generator tiQ generates one index pulse as the rotating body to be measured rotates, and the pulse is counted by a counter to calculate the time differential value of the four speeds and use that time differential value. A load torque measuring device characterized in that the load torque is calculated by using the load torque.