Variable voltage control method of electromotive force closed-loop series motor controlled through exciting voltage

Abstract

The invention discloses a variable voltage control method of an electromotive force closed-loop series motor controlled through an exciting voltage. The variable voltage control method of the electromotive force closed-loop series motor controlled through the exciting voltage comprises the steps that a control system is electrified, wherein a first control period includes that a terminal voltage equivalent of the series motor is preset, an electromotive force input controlled variable and a maximum total-terminal voltage set value of an exciting winding are read, armature electromotive force of the series motor, a total-terminal voltage control value of the exciting winding, and a terminal voltage control value of the motor are calculated, and a terminal voltage of the series motor is controlled in a pulse width modulation mode, and a second control period includes that the terminal voltage of the series motor and a terminal voltage of any exciting winding of the series motor are collected, the electromotive force input control variable and the maximum total-terminal voltage set value of the exciting winding are read, and an armature electromotive force equivalent of the series motor is calculated; the controller carries out circulating repetitive control according to the control sequence of the second control period. According to the variable voltage control method of the electromotive force closed-loop series motor controlled through the exciting voltage, the rotating speed of a speed adjustment driving system of the series motor can be adjusted in a linear mode, the locked-rotor torque can be set, the dynamic response is rapid, and the soft mechanical characteristic and the overcurrent protection function are achieved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to an electromotive force closed-loop series-excited motor voltage regulation and speed regulation control method controlled by excitation voltage. Background technique [0002] Series-excited motors have soft mechanical properties and are used in electric tractors, electric tools, sewing machines and mixers, etc., which require motor-driven equipment with soft mechanical properties. Adjusting the terminal voltage of the series-excited motor can realize the speed regulation of the series-excited motor drive system. Using different control methods to adjust the terminal voltage of the series motor can endow the series motor with different static and dynamic performances. [0003] When adjusting the terminal voltage speed regulation of the series excited motor, if the speed is directly controlled by the static-difference closed-loop control, the linear speed regulation of the sys...

AI Technical Summary

Problems solved by technology

However, the commonly used motor torque control methods are complex, and it is necessary to study the unique method of electromagnetic torque control of series motors based on the series characteristics of the field winding and the armature winding.

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