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DC motor speed control circuit based on bridge servo control

A DC motor and servo control technology, applied in the direction of excitation or armature current control, etc., can solve the problems of circuit board temperature rise, affecting the accuracy of circuit work, product stability, etc., to achieve the effect of improving stability and reducing the impact

Active Publication Date: 2015-09-30
DATONG POWER SUPPLY BRANCH SHANXI ELECTRIC POWERCO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is inevitable to add a lot of chips and auxiliary devices, which will increase a lot of heat inside the equipment and increase the temperature of the circuit board, which will affect the working accuracy of the entire circuit and the stability of the product.

Method used

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  • DC motor speed control circuit based on bridge servo control
  • DC motor speed control circuit based on bridge servo control
  • DC motor speed control circuit based on bridge servo control

Examples

Experimental program
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Embodiment Construction

[0013] A practical DC motor can be used including the armature resistance R a and back EMF source E c represented by an equivalent circuit. Therefore, a bridge circuit including a motor such as figure 1 shown. When the bridge circuit is formed, the parameter value of the bridge arm resistance should meet the following proportional conditions, that is, R 1 :R 2 =R 3 :R a , so as to ensure that when the motor speed is zero, the output voltage E of the bridge circuit ab Also zero. When the motor rotates, the motor will induce a back electromotive force E that is proportional to the rotational speed c , the output voltage of the bridge circuit E ab will also be related to the back EMF E c (that is, proportional to the motor speed). In this way, it is possible to use the E ab As a speed signal, the speed of the motor is controlled.

[0014] When the load of the motor changes, in order to keep the speed of the motor constant, as long as the output voltage E of the bridg...

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PUM

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Abstract

The invention provides a direct-current motor rotation speed control circuit based on bridge type servo control. The circuit comprises a plurality of resistors, a variable resistor, a triode, a comparison amplifier and a direct-current voltage source. A bridge type servo control system consisting of a bridge type circuit is used in the circuit; when motor rotation speed is set, set voltage is used for simulatively indicating set rotation speed value; and if the set voltage value is not changed, the rotation speed N is stable and is not changed, so that the aim of stabilizing the rotation speed of a motor is fulfilled. The rotation speed N of the motor is changed by changing the set voltage, so that the aim of adjusting the rotation speed of the motor is fulfilled. The control on the stability of the rotation speed of the motor is realized, the requirement of small volume of a device is met, the influence of temperature to the stability of the circuit is effectively reduced, and the stability of the whole device is improved to the greatest degree.

Description

technical field [0001] The invention relates to a DC motor speed control circuit, in particular to a DC motor speed control circuit based on bridge servo control. Background technique [0002] The micro-motor control technology has an increasingly significant impact on the quality and economy of small devices such as audio equipment. To make a micro motor, the simpler the speed control circuit, the better. Therefore, I designed this circuit that can use the characteristics of the motor itself to detect and control the speed without setting up other speed sensors to detect the speed. The volume of the device is reduced, and good economic benefits can also be obtained. [0003] But from our daily life, we can find that due to the structure and characteristics of the motor itself, it will definitely generate a certain amount of heat, especially when it is loaded, the temperature will be higher. The temperature has decreased, but based on people's higher and higher requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/28
Inventor 呼艳生梁国文王启银赵睿
Owner DATONG POWER SUPPLY BRANCH SHANXI ELECTRIC POWERCO
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