CN102386821A

CN102386821A - DC motor torque controller

Info

Publication number: CN102386821A
Application number: CN2011103767172A
Authority: CN
Inventors: 许瑞敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-17
Filing date: 2011-11-17
Publication date: 2012-03-21

Abstract

The invention discloses a DC motor torque controller which comprises a singlechip, a current sampling circuit and a controllable silicon, wherein, the current sampling circuit is connected with the singlechip; and the output end of the singlechip is connected with the controllable silicon. The torque controller is characterized by further comprising a voltage sampling circuit connected with the DC motor; and the input end of the singlechip is connected with a given voltage or a given current. In the DC motor torque controller adopting the structure, the given current is used for controlling the motor torque and the given voltage is used for controlling the rotational speed of the motor, so the double close-loop control of the torque and rotational speed is realized, accordingly, the motor has a larger torque even in a low-speed state and can be protected at stall.

Description

The direct current machine torque controller

Technical field

The present invention relates to the control field of direct current machine moment, particularly direct current machine moment intelligent controller.

Background technology

At present, the controller of torque motor all adopts the three-phase open loop to carry out pressure regulation and speed governing, sort controller; Along with the increase of motor load, rotating speed of motor is more and more slower, after motor speed is slack-off; Its moment of torsion just reduces; This velocity setting that just requires constantly to regulate Moment Motor Controller to be reducing the speed of torque motor, if regulate untimely, just can cause the motor rotation blockage phenomenon.All realize when the take-up like the I-beam wheel of admission machine through torque motor.Therefore, those skilled in the art have just invented a kind of output voltage of can regulating automatically to reach the Moment Motor Controller of automatic adjusting torque motor rotating speed.Look into the Chinese patent database, a notification number is CN201403069Y, and name is called the patent of invention of " Moment Motor Controller "; Following content is disclosed: a kind of Moment Motor Controller; It is characterized in that: comprise the input that is connected with the torque motor load, input is connected with rectifier filter, and the output of rectifier filter connects synchronized sampling transformer and triode loop; And then the process inverter is connected to 2 pin of 555 chips; 3 pin of 555 chips connect to amplify controls zero cross fired chip MOC3020, and MOC3020 is connected to bidirectional triode thyristor, and 5 pin of 555 chips also are connected with given voltage.The Moment Motor Controller of this structure adopts three-phase alternating current to control, and its moment is used to make a gesture of measuring low, during low speed torque little, output torque is little, can generate heat during long-time stall causes burning out motor, and the reaction speed of motor is slow; When motor stopped suddenly, transformer burnt out easily, and the direct current machine torque controller that often adopts adopts current limliting to control rotating speed of motor, and the electric current of its motor can be influenced by rotation speed change, thereby its control effect is not ideal enough.

Summary of the invention

In view of the deficiency that background technology exists, the technical problem that the present invention will solve provides a kind of direct current machine torque controller of realizing moment and the two closed-loop controls of rotating speed.

For this reason; The present invention adopts following technical scheme to realize: a kind of direct current machine torque controller, comprise single-chip microcomputer, current sampling circuit and controllable silicon, and said current sampling circuit links to each other with single-chip microcomputer; The output of said single-chip microcomputer links to each other with said controllable silicon; It is characterized in that said controller also is provided with voltage sampling circuit, said voltage sampling circuit links to each other with direct current machine, and the input of said single-chip microcomputer is connected with given voltage or given electric current.

Said given voltage is realized through the adjustable potentiometer that is connected with given electric current.

This structure of the present invention, because motor speed is directly proportional with counter electromotive force of motor, moment is directly proportional with current of electric; Control Motor torque so can realize two closed loops of voltage and current, make motor that bigger moment of torsion also arranged under lower-speed state, make motor when stall, can not generate heat simultaneously; Protected motor, different with the dc controller of the pressure control of transmission and current limliting, through potentiometer given rotating speed and moment; Single-chip microcomputer can be regulated automatically, and its current of electric can not receive the influence of rotation speed change, makes motor in the rated current scope, bring into play optimum efficiency; Thereby effectively saved electric energy, and to compare with traditional torque motor, it is energy-conservation more than 30%.

Description of drawings

Combine accompanying drawing to further describe relevant details of the present invention below again.

Fig. 1 is a structured flowchart of the present invention;

Fig. 2 is circuit theory diagrams of the present invention.

Embodiment

With reference to accompanying drawing, this direct current machine torque controller comprises single-chip microcomputer IC, voltage sample circuit, current sampling circuit and controllable silicon; Said single-chip microcomputer connects a pulse transformer MC1, and controllable silicon SCR 1, SCR2 link to each other with pulse transformer, and said current sampling electric current is arranged between direct current machine and the single-chip microcomputer; Said controller also is provided with voltage sampling circuit, and said voltage sampling circuit links to each other with direct current machine, is about to voltage sampling circuit and is connected between single-chip microcomputer and the direct current machine; The silicon controlled output is connected to current sampling circuit and voltage sample circuit end; The voltage of this voltage sample circuit sampling is the back electromotive force of direct current machine, and the electric current that the S1 end of said current sampling circuit obtains is current of electric, and the voltage of resistance R 28 ends is counter electromotive force of motor; Input at single-chip microcomputer is connected with given voltage or given electric current; Therefore, direct current machine can carry out work according to given curtage, and wherein given voltage or given electric current are realized through potentiometer.Because the moment of torsion and the rotating speed of motor are to be directly proportional with the operating voltage and the operating current of motor, so, through potentiometer, can set rotating speed and moment of torsion to direct current machine.

The present invention controls according to following mode: according to moment of torsion and the rotating speed set; Promptly set the operating voltage and the operating current of direct current machine; Single-chip microcomputer sends pulse signal according to the parameter of setting and gives controllable silicon, makes controllable silicon open the α angle, and it is relevant with the pulse signal intensity of single-chip microcomputer transmission that controllable silicon is opened the size at α angle; The silicon controlled output is connected with direct current machine; The current ratio that the electric current of current sampling circuit collection is delivered to PID controller and setting in the single-chip microcomputer after, handle by single-chip microcomputer again, so form current closed-loop and control.Make direct current machine under the operating current of setting, work, promptly according to the moment work of setting.In like manner; The back electromotive force of the direct current machine that voltage sampling circuit collects and the given voltage PID controller in single-chip microcomputer relatively after; Single-chip microcomputer is also controlled direct current machine through controllable silicon; The control of formation voltage close loop makes direct current machine under the voltage of setting, to work, and promptly comes work according to the rotating speed of setting.Thereby when setting rotating speed of motor and moment of torsion through potentiometer, through of the present invention pair of closed-loop control, the electric current of motor can not receive the influence of rotation speed change, so just can make direct current machine in the rated current scope, bring into play optimum efficiency.

Sort controller of the present invention can be widely applied in the fields such as Digit Control Machine Tool, automation equipment, printing machinery, spooling equipment, package packing machine, and it is fast to have the motor reaction speed, and the linearity is good, and low speed torque is big, energy-saving advantages.

Claims

1. direct current machine torque controller; Comprise single-chip microcomputer, current sampling circuit and controllable silicon; Said current sampling circuit links to each other with single-chip microcomputer, and the output of said single-chip microcomputer links to each other with said controllable silicon, it is characterized in that said controller also is provided with voltage sampling circuit; Said voltage sampling circuit links to each other with direct current machine, and the input of said single-chip microcomputer is connected with given voltage or given electric current.

2. direct current machine torque controller according to claim 1 is characterized in that the adjustable potentiometer realization through connecting of said given voltage or given electric current.