Method for controlling speed of motor

Abstract

The invention discloses a method for controlling the speed of a motor. The motor comprises a direct current motor, a gear speed reducer, a control module and a rotating speed detecting module, wherein the gear speed reducer is used for conducting speed reducing on output of the direct current motor, the control module controls the direct current motor to operate, and the rotating speed detecting module is used for detecting the operating speed of the direct current motor. The method is characterized by including the following steps that the rotating speed detecting module detects the real-time operating speed of the direct current motor; the control module automatically controls the direct current motor to operate according to signals detected by the rotating speed detecting module, the direct current motor is maintained at constant preset speed which does not change along with the load after the speed of the direct current motor is reduced through the gear speed reducer, and the preset speed is smaller than the operating speed of the motor when the motor is unloaded at nominal voltage. When the direct current motor is a curtain motor, the preset speed is smaller than the operating speed of the curtain motor when the curtain motor is at nominal load, and the curtain motor is maintained at preset speed in a PWM speed regulating mode. When the direct current motor is a direct current tubular motor, the preset speed is smaller than the uplink speed of the direct current tubular motor when the direct current tubular motor is at nominal load.

Description

technical field [0001] The invention relates to a motor, in particular to a method for controlling the speed of a DC motor. Background technique [0002] In the existing DC tubular motor, when the motor drives loads of different weights (such as roller blinds) up and down, the motor with the heavier load will run at a slower speed, and the motor with a lighter load will run at a faster speed. Therefore, for the same motor For example, the noise is louder when driving a lighter load; while the existing DC curtain motor, when the motor drives loads (curtains) of different weights to open or close horizontally, the motor with a heavier load will run slower. The motor runs faster when the load is lighter, so for the same motor, the noise is louder when driving a lighter load. [0003] And when the tubular motor lifts or pulls the load, the upward process is relatively stable, but during the downward process of the load, since the load will drag the motor to run, the motor is eq...

AI Technical Summary

Problems solved by technology

However, the technical limitation of using the discharge circuit is very large. Usually, the selection of the resistance value is not targeted. For a long time, the discharge energy is relatively large, and the discharge resistor is easy to burn out due to heat, causing the entire device to fail to work. In order to ensure the discharge energy, the discharge resistor is increased, resulting in a large volume of the discharge resistor. In general tubular motors can not be achieved

[0004] In addition, if it is an application with multiple roller blinds in a row, due to the uncontrolled downward process and the inconsistency of the motor characteristics, the height of the roller blinds will be uneven during the downward process, which is extremely unsightly and limits the popularization and application of tubular motors.

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