SU718734A1 - Device for measuring power on the shaft - Google Patents

Description

one

The invention relates to load measurement technology and can be used to measure power on a rotating shaft, in particular on a shaft of an electric machine.

A device for measuring the power transmitted by a rotating shaft is known, comprising a torque sensor, a pulse sensor of the shaft speed, a driver of a time interval proportional to the torque, a generator and a power counter. However, it does not provide the required measurement accuracy 1.

The closest in technical essence and the achieved result to the invention is a device for measuring shaft power, comprising a torque sensor with a time-pulse output, connected to the input of the delay element, the first input of the memory register and via a trigger with the first input of the circuit And an output of which is connected to one input of a power meter, another input of which is connected to the output of a delay element, and an output connected to a second input of a memory register, and a shaft rotation speed sensor with a frequency-pulse output 2. T some device also does not provide the required accuracy of measurement of the discreteness

measurement and limited measuring range.

The purpose of the invention is to improve the measurement accuracy.

This is achieved due to the fact that a quadratic frequency multiplier is introduced into the device, made in the form of a reference frequency generator, the output of which is connected through two successively

connected controlled frequency divider with the second input of the AND circuit and through the frequency divider with the counting input of the frequency multiplier counter, the input "Reset of which is connected to the output of the delay element

frequency multiplier, and the output with the code input of the memory register of the frequency multiplier, connected by its output with the code inputs of the controlled frequency dividers. Entry "Record of memory register and

The input of the frequency multiplier delay element is connected to the output of the shaft rotation speed sensor.

The block diagram of the device shown in the drawing.

The device for measuring power on the shaft contains a torque sensor with a time-pulse output in the form of two sensors 1, 2 of the angle of rotation of the shaft, sensor 3 of the speed of rotation of the shaft, trigger 4,

Element 5, power counter 6, memory register 7, delay element 8 and quadratic frequency multiplier, including delay element 9, reference frequency generator 10, frequency divider 5, counter 12, memory register 13 and controlled dividers 14 and 15 frequencies.

The device works as follows

The sensors 1 and 2 of the twist angle form pulses that are separated in time by the value of t.

The twist angle a, proportional to the torque, is equal to

, -t-n, 15

where ki is the coefficient of proportionality, n is the number of revolutions.

The power, on the shaft P, is proportional to the torque and the speed of the shaft, is equal to

p th,

where 2 is the proportionality coefficient .25

The pulse generated at the output of the trigger 4, equal in duration t, is fed to the first input of the element 5. At its other entrance there are pulses with a frequency proportional to the square of the number of shaft revolutions multiplied by the coefficient H2. During time t, the number of pulses proportional to the power on the shaft will be accumulated on the counter b.

A pulse from sensor 2 at the end of an interval of 35 a t forms the code formed at the output of counter 6, is written to memory register 7, and counter 6 is set to zero by element 8.

 - The operation of the frequency multiplier is reduced to 40 by the periodic formation of the counter

12 code, which is proportional to the period, often impulses, coming from the sensor of the camera, memorizing this code in the register

13 in terms of the signal from sensor 3 and the control of this code by the division factors of the controlled frequency dividers 14 and 15. The frequency multiplier is set by the frequency divider 11.

The use of a quadratic frequency multiplier in the device will allow increasing the frequency and decreasing the resolution when multiplying and thereby increasing the measurement accuracy.

Claims (2)

1. Author's certificate of the USSR 167332, cl. G OIL 3/24, 1963. 2. Authors certificate USSR 532772, cl. G 01 L 3/24, 1975 (prototype).