Dynamic potential detection circuit for DC motor

Abstract

The invention relates to a dynamic potential detection circuit for a DC motor. The detectable quantity obtained by conventional equipment cannot reflect the dynamic process of the detected physical quantity and has poor real-time. The dynamic potential detection circuit comprises a DC motor armature electric quantity detection circuit and a dynamic potential operation circuit, wherein the DC motor armature electric quantity detection circuit comprises an armature winding M1 of the DC motor, and the positive end A+ of the armature winding is connected with the Ud end of a connecting piece CN1 and one end of an upper divider resistor R2 respectively; the negative end A- of the armature winding is connected with one end of a microinductor L1 and one end of a potential positive input resistor R4 respectively; and the dynamic potential operation circuit comprises a potential operational amplifier U1, a current operational amplifier U2 and a superposition operational amplifier U3. The dynamic potential detection circuit has the advantages of simple circuit structure, strong generality and low cost.

Description

technical field [0001] The invention belongs to the field of industrial control and relates to a circuit, in particular to an automatic detection circuit suitable for the dynamic potential of a DC motor, and the circuit is also suitable for the indirect detection of the rotational speed. It is suitable for all kinds of requirements that need to detect the dynamic potential of the DC motor or indirectly detect the motor speed. Background technique [0002] The dynamic potential is an important physical quantity of the DC motor, especially in the separately excited DC motor, which also reflects the motor speed. Therefore, the detection of the dynamic potential is the basis of the DC motor measurement and control system, which can meet the speed control requirements without the speed sensor. At present, the commonly used DC motor potential detection or indirect speed detection scheme mainly detects the armature voltage and armature current of the DC motor, combined with the arm...

AI Technical Summary

Problems solved by technology

At present, the commonly used DC motor potential detection or indirect speed detection scheme mainly detects the armature voltage and armature current of the DC motor, combined with the armature resistance, and calculates the electric potential of the motor based on the steady-state circuit model, and then calculates the speed. The main problem is that the armature inductance of the motor is ignored, so that the detected quantity cannot reflect the dynamic process of the measured physical quantity, and the real-time performance is poor.

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