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DC motor speed control device and method

A technology of speed control device and DC motor, which is applied in the direction of excitation or armature current control, which can solve problems such as difficult installation, poor speed control performance, and complex structure, so as to save installation process steps and improve static performance and dynamic characteristics. , The effect of saving installation space

Inactive Publication Date: 2011-05-18
江门市路思拓电机电器有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the DC motor speed control device, the disadvantages of using these speed measuring sensors are: 1. There is no space or position for sensor installation reserved in engineering practice, resulting in difficulty in installation
2. The structure is complex, resulting in difficulties in the transmission of sensor feedback signals, resulting in poor speed control performance

Method used

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  • DC motor speed control device and method
  • DC motor speed control device and method
  • DC motor speed control device and method

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Embodiment Construction

[0020] As shown in Figure 1, the speed determination unit 110 is connected in series in the armature circuit of the DC motor 100, the speed determination unit 110 is connected to the two ends of the resistor 111 by the first subtractor 112, and the resistor 111 is connected to the DC motor 100 , the output of the first subtractor 112 is sequentially connected to the first multiplier 113 , the second subtractor 114 and the second multiplier 115 . Wherein, the voltage signal at both ends of the resistor 111 can be obtained based on the current in the armature winding of the DC motor 100 . The first subtractor 112 is the voltage V across the resistor 111 1 and V 2 Subtract to get the voltage difference signal. The first multiplier 113 multiplies the voltage difference signal by a proportional coefficient, and the proportional coefficient of the multiplier is K a , proportional coefficient K a is determined based on the following formula:

[0021] K a = R m / R

[0022] In ...

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Abstract

The invention discloses a speed control device of a DC motor and a method thereof. The speed control device comprises a speed determination unit. The speed determination unit is connected with a controller; a speed instruction signal is input to the controller; and a power supplying unit which is connected in series between the speed determination unit and the controller. The operation method of the device is as follows: firstly, a rotating speed of the DC motor is confirmed through the speed confirmation unit, a speed feedback signal of the DC motor is input to the controller, the speed instruction signal is compared with the speed feedback signal by the controller so as to generate a speed error signal, the speed error signal is operated and compared by the controller so as to generate a speed control signal of the DC motor, and the power supplying unit supplies power to the DC motor to enable the DC motor to operate at a rotating speed required by the speed instruction signal. The invention can realize the loop closing control of the speed feedback, without the need of installing a speed feedback sensor, thereby saving installation space and installation techniques steps, and improving static performance and dynamic property of the speed control of the DC motor.

Description

technical field [0001] The invention relates to a DC motor speed closed-loop control device and method. Background technique [0002] At present, the speed control of the known DC motor must adopt a closed-loop feedback control method to obtain the speed control performance, and the speed control signal is generated by the controller to provide precise adjustment for the speed of the DC motor. Closed-loop control requires sensors specially used to detect speed, such as analog or digital speed sensors made of mechanical, photoelectric, electromagnetic, laser and other principles. In the DC motor speed control device, the disadvantages of using these speed measuring sensors are: 1. There is no space or position for sensor installation reserved in engineering practice, resulting in difficulty in installation. 2. The structure is complex, which leads to difficulties in the transmission of sensor feedback signals and poor speed control performance. Invention content: [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/18
Inventor 曾文火朱鹏程
Owner 江门市路思拓电机电器有限公司
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