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Precise Positioning Control Method of DC Motor Type Electric Push Rod

A technology of electric push rods and DC motors, applied in the field of control, can solve problems such as inability to realize positioning control, and achieve the effect of low production costs

Active Publication Date: 2017-04-05
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for accurate positioning control of a DC electric push rod in view of the fact that the existing DC motor type electric push rod cannot achieve accurate positioning control

Method used

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  • Precise Positioning Control Method of DC Motor Type Electric Push Rod
  • Precise Positioning Control Method of DC Motor Type Electric Push Rod
  • Precise Positioning Control Method of DC Motor Type Electric Push Rod

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Embodiment Construction

[0017] figure 1 It is a structural composition of a DC motor closed-loop control for an electric push rod. In the entire closed-loop control system, it includes: an electric push rod controller 1 and an electric push rod 9 . The electric push rod controller 1 includes a main control module 2 and a peripheral circuit module, the peripheral circuit module includes a PWM signal amplifier 5, a field effect transistor 6, a current drive chip 7 and a double-open double-throw relay 8, etc., and the main control module 2 includes a PID module 3 and A / D module 4, etc., the electric push rod 9 includes a DC motor 10 and a Hall sensor 11, etc. After the PID module 3 calculates according to the PID algorithm, it sends out PWM pulses, and after being amplified by the PWM signal amplifier 5, it drives the FET 6 to change the driving current of the DC motor 10 of the electric push rod 9, thereby realizing the control of the speed of the DC motor 10; The control module 2 outputs a TTL level...

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Abstract

The invention relates to a precise positioning control method of a DC (Direct Current) motor type electronic push rod. According to the method, the precise positioning control can be realized by performing closed-loop control on a DC motor of the electronic push rod. The method comprises the following steps: firstly, performing phase demodulation counting on pulse signals generated by two haul sensors to obtain the number of rotations and rotating direction of the motor; obtaining an existing positioning position of the electronic push rod in accordance with the screw pitch of a screw of the electronic push rod; by adopting a disperse PID (Piping and Instruments Diagram) control method, taking a deviation value between a set positioning position and the existing positioning position of the electronic push rod as an input value controlled by PID, and taking the pulse width of PWM (Pulse-Width Modulation) as an output value controlled by the PID; controlling the rotating direction of the DC motor in accordance with the positive and negative pulse width values, and controlling the rotating speed of the DC motor in accordance with the magnitude of an absolute value of the pulse width. According to the precise positioning control method provided by the invention, the precise positioning of the electronic push rod can be realized, and the DC motor type electronic push rod with lower production cost has the precise positioning functions of a stepper motor type electronic push rod and a servo type electronic push rod.

Description

technical field [0001] The invention belongs to the technical field of control, and relates to a precise positioning control technology of an electric push rod, in particular, the positioning control method is applied to a DC motor type electric push rod to realize its precise positioning function. Background technique [0002] The electric push rod is a kind of linear drive device, which converts the rotary motion of the drive motor into the linear reciprocating motion of the push rod through the transmission of the screw nut. It can be used as an execution machine in various simple or complex technological processes to realize remote control, centralized control or automatic control. Electric push rods are widely used in electric medical beds, electric sofas, electric booth lifting rods, industrial electric lifting systems, etc. [0003] According to the type of driving motor, electric push rods can be divided into: DC motor type (12 / 24 / 36V), AC motor type (220 / 380V), ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/28
Inventor 李强卢冠军
Owner HANGZHOU DIANZI UNIV
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