SU1684895A1 - Compensated emf transducer - Google Patents

Description

one

(21) 4736223/07

(22) 11.09.89

I6) 10.15.91. Bul №38

(71) Special design and engineering department and technological bureau of electrical machines of the Electromashina plant

(72) A.G. Ivanov, I.I. Ushakov, Yu.P Serdyukov and P. V.Natarov (53) 621.316.718 (088.8)

(56) USSR Copyright Certificate № 1309234, cl. H 02 P 5 / 06,1985

Electrical Engineering, 1988, No. 2, p. 8, fig. 2. (54) COMPENSATED EMF SENSOR

(57) The invention relates to electrical engineering and can be applied in installations

2

EMF measurements, in particular, in valve electric drives with feedback on the EMF of the engine. The aim of the invention is to improve the accuracy. The EMF sensor contains a current sensor 1, a voltage sensor 2, and an adder 3. Because changing the current shape is proportional to the voltage change on the motor, i.e. its rotational speed, then changing the current sensor 1 signal with the input of the controlled voltage divider 4 proportional to the motor speed allows to compensate for the change in the motor current shape and accurately. The EMF of the engine in the entire range of speed control. 1 silt

(L

WITH

about bk

00

you ate

The invention relates to electrical engineering and can be applied in installations for measuring EMF, in particular for valve actuators with feedback on the EMF of an engine.

The purpose of the invention is to improve accuracy.

In the drawing, Prioeden functional EMF sensor circuit.

The compensated EMF sensor contains a current sensor 1, a voltage sensor 2, an adder 3, one input of which is connected to the output of a sensor 2 by a voltage controlled voltage divider 4 connected between the output of a current sensor 1 and the second input of the adder 3. Control input 4 voltage is connected to the control input 5 of the EMF sensor.

The device works as follows.

The adder 3 performs the algebraic summation of signals from voltage sensor 2 and current sensor 1.

UE-UH-UI.

where Ut, DM, Ui are the voltages on the outputs of the EMF sensor, voltage sensor and current sensor.

Since the signal from the voltage sensor LL contains two component parts proportional to the voltage drop and the back emf in the load circuit (motor), inputting an additional current signal proportional to the voltage drop in the load circuit at the input of the adder 3 allows receive at its output a voltage corresponding to the counter electromotive force of the load UL.

When the motor speed is controlled by changing the voltage on the bark, the current form factor l changes, hence the mean ,, ,, .-. current current gattel. which violates the setting of the EMF sensor and the accuracy of the emission of the EMF of the engine.

0 But since the change in the current form is proportional to the voltage change on the motor, i.e. its rotational speed, then a change in the signal of current sensor 1. with the help of a controlled divider 4, the proportional ratio of the two actuators compensates for the change in the shape of the motor current and exactly emits the emf of the drive voltage. In this case, a voltage proportional to the motor speed, for example, a voltage reference voltage, can be used in the voltage (for the control voltage of the divider 4).

Claims (1)

p. Formula of invention A compensated EMF sensor containing a tick sensor, a voltage sensor, s / mmator, one input of which is connected to the output of a voltage sensor, is distinguished from one and another. what. In order to increase accuracy, a controlled voltage divider connected between the current sensor output and the second input of the adder was inserted into it, the control input of the voltage divider connected to the control input of the EMF sensor.