Accurate identification method of motor speed after intermittent power supply energy saving control

Abstract

The present invention belongs to the field of the motor energy saving control technology, and especially relates to a motor rotating speed accurate identification method after outage in an interrupted power supply energy saving control. After a motor power supply is cut off, the rotation speed is detected by using the motor stator winding residual voltage; when the residual voltage is decreased to a 10% of a rated voltage, a single-chip microcomputer is employed to control a silicon controlled rectifier device to power on any one phase winding so as to allow the rotor silver to induct electromotive force and current; and after any one phase winding of the stator powers on, the stator winding is cut by using the magnetic field rotating with the rotor generated in the space according to the current inducted at the rotor side, induction electromotive force corresponding to the rotor rotating speed is inducted, and the single-chip microcomputer is used for determining the induction electromotive force frequency to complete the accurate identification of the rotor rotating speed in the interrupted power supply energy saving control process. The motor rotating speed accurate identification method after outage in interrupted power supply energy saving control is able to ensure that the residual voltage in the outage control process is not too low in attenuation and ensure the stable rotating speed of the motor and accurate detection with no need for changing operation parameters of the motor in the condition of reducing the energy consumption as possible.

Description

technical field [0001] The invention belongs to the technical field of electric motor energy-saving control, and in particular relates to a method for accurately identifying the rotational speed of a motor after power interruption for intermittent power supply energy-saving control. Background technique [0002] Most of the oil production equipment at home and abroad are beam pumping units. When the motor drives this type of load, the motor is usually under heavy load during the upstroke of the pumping unit. Due to the action of the sucker rod and the gravity of the liquid column during the downstroke, The motor will enter light-load or even power-generating conditions. Aiming at the characteristics of this periodic potential energy load, a large number of literatures have proposed and studied a variety of energy-saving technologies for pumping unit motor systems from the perspective of different energy-saving mechanisms. These energy-saving technologies can be roughly divi...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of too low attenuation of the residual voltage of the pumping unit mentioned in the above background technology, the present invention proposes a method for accurately identifying the motor speed after a power interruption with intermittent power supply energy-saving control, including:

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