DE2941261A1 - Measurement and direct indication of mechanical power - is by potentiometer multiplication of rotation speed signal and torque - Google Patents

Abstract

The device enables the formation and indication of a measurement value for the mechanical power of a rotating machine and derives the power value from measured rotation speed and torque using a simple computation circuit producing their product. Manual calculatory and the associated errors are eliminated and ease of monitoring is increased compared to conventional arrangements. The output voltage of a transducer (G) measuring rotation speed (n) is fed to a high linearity potentiometer (P) whose slider(s) is positioned by a torque (M) balance or similar. The voltage (US) at the potentiometer slider is proportional to mechanical power (P mech). Thus voltage is displayed on a moving coil voltmeter or other voltage instrument. It may be fed to a data processing system for further processing or use in process control.

Description

Patent application: device for the formation and display of the

mechanical performance.

1. Description, The present patent application relates to a device for the simple formation and display of a measured value for the mechanical performance of rotating machines.

As is well known, the mechanical performance of a rotating one results Machine from the mechanical components rotational speed and torque according to the simple relationship: mech = @ M = 2nnM = prop n M -1 here is Go = Angular speed in s = 2an -1 n = rotational speed in s M = torque in Nm The idea on which the present patent application is based is based on this Relationship and provides the measured value of the mechanical performance from the two factors Rotation speed and torque by means of a simple arithmetic circuit that the product forms. The first component, speed, is the electrical output voltage a measuring generator whose shaft is coupled to that of the rotating machine while the second component is torque from a torque balance as a position value, for example at the output of a pendulum generator.

2nd embodiment.

The simple calculation circuit for the formation of the product from the measured values the speed as voltage and the torque as position is shown in FIG.

The shaft of the test object, for example an electric motor, with the Speed n is coupled to the direct current generator G, the voltage of which is about a Adjust potentiometer E to the linear potentiometer P with the lowest possible Adjustment torque is supplied between the beginning and the end of its winding. The voltage US applied to the wiper S of the potentiometer P is therefore proportional the speed n.

The one from a torque balance at the output of a pendulum generator The position value supplied is mechanical with the wiper S of the potentiometer P. coupled. The position of the grinder is therefore proportional to the torque M.

The total voltage Us now applied to the wiper is therefore proportional the product of n and M and thus the mechanical power P ch of the rotating Machine. You can use an electrical voltmeter V with a correspondingly high Internal resistance or with the help of a motor compensator can be displayed. For electronic data processing, for example for control or regulation processes, it can be fed to a corresponding device at the same time.

3. Advantages of the invention.

According to the state of the art, the speed is measured or displayed n by means of a measuring generator coupled to the shaft of the test object a voltmeter and the measurement of the size M by a movable over a scale Pointer which is coupled to the position of a torque balance or the like. By arithmetical multiplication both values can then be the mechanical Power P I can be determined.

The present invention offers the advantage that the mechanical power Pmcch simultaneously in addition to the mechanical components n and 1 can be read directly. There is no manual arithmetic product formation.

This avoids errors and increases the clarity of a Trial series increased significantly.

In addition, the rapid determination of a tendency when driving through of the entire range possible in larger test series. Maximum and minimum values can be quickly determined and estimated, and thus the course of the experiment programmed and often also abbreviated.

Claims (3)

4o claims:>) Device for the formation and display of the Measured value for the mechanical power P ch of rotating machines characterized in that that a highly linear potentiometer (P) with a very small adjustment torque between The beginning and end of its winding is the voltage proportional to the rotational speed n a measuring generator (G) and its grinder (S) with the position of a Torque balance or the like. Is coupled so that the one on the grinder (S) Voltage Us is proportional to the mechanical power P ch. 2) Device according to claim 1, characterized in that the mechanical power P ch proportional voltage US for displaying a voltage-sensitive Measuring device, e.g. a moving coil measuring instrument or a motor compensator will. 3) device according to claim 1 or 1 and 2, characterized in that that the mechanical power Pmech proportional voltage U5 for the purpose of electronic data processing or Process control fed to a corresponding data processing system will.