CN202190244U

CN202190244U - Bipolar chopping subdividing stepping motor driver

Info

Publication number: CN202190244U
Application number: CN2011202298271U
Authority: CN
Inventors: 付立强; 王冰
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-07-01
Filing date: 2011-07-01
Publication date: 2012-04-11
Anticipated expiration: 2021-07-01

Abstract

The utility model relates to a bipolar chopping subdividing stepping motor driver. The driver mainly includes a control circuit, an input power source stabilizing circuit and a power drive circuit. The control circuit is composed of a pulse distribution circuit module, a current control circuit module, a protection circuit module and an output circuit module. The input power source stabilizing circuit is composed of a power source supply module and an input signal processing module. The power drive circuit is composed of a current resistance module and a power control module. It is distinguishingly characterized in that a special integrated chip annular pulse distributor is adopted for controlling circuit in the pulse distribution circuit module of the control circuit, and the power source supply module of the input power source stabilizing circuit stabilizes and filters an external power supply voltage and outputs a stable and reliable voltage meeting working requirements of a chip of the driver. The voltage is converted in the driver from the external power supply voltage. Thus, the driver is integrated all circuits needing for driving a bipolar chopping subdividing stepping motor and controlling currents. And a combination of functions of bipolar CMOS (Complementary Metal Oxide Semiconductors) control and current protection and the like is established on the driver through DMOS (Double-diffusion Metal Oxide Semiconductors) power switches in the same mono-stable structure. And an innovative current detection method is adopted. Therefore, the driver is in a switching condition from an automatic half flow state to a rated current state. Thus, the power consumption of the output circuit is reduced, the temperature rise speed is lowered, and the reliability is improved. Besides, the bipolar chopping subdividing stepping motor driver in the utility model has a simple structure and a low cost, and can be an upgraded product of a prior stepping motor driver, thereby facilitating to promote.

Description

Stepper motor driver is segmented in a kind of bipolarity copped wave more

Technical field

The utility model relates to a kind of bipolarity copped wave and segments stepper motor driver more, belongs to the performer in the automation controls such as Digit Control Machine Tool, industrial robot.

Background technology

Stepping motor is a kind of electric pulse to be converted into the actuator of angular displacement, can come the pilot angle displacement through the control impuls number, thereby reach the purpose of accurate location.

At present stepping motor has a wide range of applications in middle-size and small-size automation equipment such as Digit Control Machine Tool, Medical Instruments and instrument industry, and the characteristics of this type stepping motor are: keep that moment of torsion is not high, the frequent starting reaction speed is fast, running noise is low, operate steadily, control performance is good, the complete machine cost is low; But at present the driver of domestic existing this type of stepping motor costs an arm and a leg, poor stability, temperature rise is fast, temperature is high, useful life is short, scrappage is high, has had a strong impact on stepping motor extensively popularizing and using in all kinds of lathe components and parts.

Summary of the invention

The utility model provides a kind of bipolarity copped wave to segment stepper motor driver more.

The utility model mainly comprises control circuit, input power supply stabilizing circuit, power driving circuit; Wherein control circuit is made up of pulse distributor module, current control circuit module, protective circuit module and output circuit module; Input power supply stabilizing circuit is made up of power supply module, input signal processing module; Power driving circuit is made up of electric current resistance module and power control module; Its notable feature is: in the pulse distributor module of control circuit, use the special integrated chip cycle pulse distributor; It can realize segmentation selection signal when the pulse that receives outside input, direction and enable signal; Current amplitude is selected signal; Thereby the triangular signal (PWM) of output current reference signal (REF) and fixed frequency is to realize Stepping Motor Control; Through power supply module in the input power supply stabilizing circuit outside supply power voltage is carried out voltage stabilizing, filtering, export simultaneously it is converted into voltage stable, this machine chip work reliably in this internal drive; Can realize through electric current resistance module and power control module in the power driving circuit: when break impulse is imported; Current value was half the when motor current value can become work; Thereby caloric value minimizing, power reduction, the noise of motor self are reduced, realize the automatic semi-fluid running of motor.

On the domestic market, the Stepping Motor Control circuit formation of generally seeing mainly contains more: by the cycle pulse distributor that disperses device to form, software cycle pulse distributor, special integrated chip cycle pulse distributor etc. at present.Select for use the third scheme directly to adopt the special integrated chip cycle pulse distributor during the utility model design, reduce the kind of components and parts on the one hand, reduced volume; Reduce purchase cost on the other hand, reliability is provided; Little, low in energy consumption, reliable and stable, the simple structure of this type of small product size simultaneously, with low cost, be convenient to promote.

The technical advantage of the utility model is:

One, can carry out photoelectricity to all input signals and isolate, improve its anti-interference, and take into account the user and possibly use differential signal and two kinds of mode input signal of single-ended signal.

Two, simplification and stable chip operation power supply.General stepper motor driver need provide two groups of DC power supplys at present, and one group is motor drive power supply, is generally 14～40VDC; Another group is generally 5VDC for the chip operation power supply, needs steady operation, and the permission fluctuation range is 4.5VDC to 5.5VDC.The notable attribute of the utility model is exactly: use for the convenience of the user; For when the user directly provides driving source for step motor it is being converted into reliable and stable chip operation power supply in inside; User's normal operation that only need provide driving source for step motor can realize machine like this need not to provide the chip operation power supply again.

Three, stepping motor is when work, if the break impulse input, motor promptly is in braking state; This is the advantage of stepping motor, but the electric current that this moment, motor itself passed through is maximum, and noise is also maximum; The motor feels hot, and heat increases severely, and directly has influence on motor properties and useful life.Electric current through motor when the utility model is imported to break impulse increases; The motor feels hot; Heat increases severely, the technical barrier that noise is also big, half when motor current value can become work when providing a kind of break impulse to import; The caloric value of motor can reduce thereupon, the automatic semi-fluid running solution that noise also can reduce.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified:

Fig. 1 is a complete step motor control system figure, contains stepping motor, stepper motor driver, power supply and peripheral control unit (clock).

Fig. 2 is the output schematic diagram

Fig. 3 is the power unit schematic diagram

Fig. 4 is a pulse input schematic diagram

Wherein the unit code name is represented as follows among each figure:

Fig. 1

U1: special-purpose integrated control chip

U2: integrated opto-coupler chip, model 6N137

U3: integrated opto-coupler chip, model P521

U4: integrated opto-coupler chip, model P521

S1: toggle switch is used for setting the segmentation number and sets output current value

M1: pulse distributor

M2: current control circuit

M3: protective circuit

M4: output circuit

M5: outside dc power supply

M6: stepping motor

M7: step actuator

M8: external signal controller

Wherein external signal controller, DC power supply and stepping motor do not belong to the present invention.

Embodiment

Pass through specific embodiment below, and combine accompanying drawing 1, do further bright specifically the technical scheme of the utility model.

Input signal has three the tunnel, and they are: off line signal FREE+, FREE-; Pulse signal CP+, CP-; Direction signal U/D+, U/D-.They are identical at the interface circuit of internal drive, and are separate.The user uses differential signal then directly to connect; The user is if the use single-ended signal as input signal, can adopt common anode to connect method as required or common cathode connects method.Altogether anode connects method: respectively with CP+, DIR+, FREE+ are connected on the power supply of control system, if the power supply of this signal be+5V then can directly insert, if greater than 5V, then needs the outside to add current-limiting resistance in addition, ensures to the drive current that inner optocoupler provides 815mA.Input signal adds through CP-.DIR-, FREE-works when high level.Common cathode connects method: respectively with CP-, DIR-, FREE-are connected to the ground end (SGND) of control system, and the input signal of+5V adds through CP+, DIR+, and FREE+ works when high level.

In order to improve the performance of stepping motor, the extensive use of driver subdivide technology.The segmentation number is high more, and electric current is level and smooth more, and motor rotates just steady more.But after the segmentation grade was greater than 1/4, the positioning accuracy of motor can not improve, and just motor rotates more steady.The design loads different segmentations for integrated control chip and selects signal through the jumper switch of 3 outsides is set, and can realize using 8 grades of different segmentation numbers.Adoptable segmentation multiple has: 1; 1/2; 1/4; 1/8; 1/16; 1/32; 1/64; 1/128.

In order to enlarge and to make things convenient for of the use of this driver to multiple stepping motor, to the setting of its output current, also be provided with the jumper switch of 3 outsides, can carry out freely switching to 8 grades of current output value easily.

Adopt special-purpose integrated control chip; Its full bridge power driver is integrated, and bipolar stepping motor drives and the required whole circuit of Control current; And on same device, make up the combination of functions such as bipolar CMOS control and current protection through the DMOS power switch on the identical monostable configuration; Make structure small and exquisite, stability improves.

The locking of concrete semi-fluid, the function that reduces power consumption during motor-locking be with reference to shown in the accompanying drawing 2, and when stopping to import the motor pulses signal, or the frequency of outside input pulse signal is during less than 1.5Hz, and driver is output as 0 at the Down control end, otherwise is output as 1.Wherein Down control end normality is output as at 1 o'clock, and the voltage of Vref is formed and set output current by R1 and the decision of R2 dividing potential drop; When stopping to import the motor pulses signal, or the frequency of input motor pulses signal has then started the semi-fluid lock function during less than 1.5Hz automatically.At this moment Rdown participates in R1, R2 dividing potential drop, thereby has reduced the voltage of Vref, has also just reduced the output current of setting.The resistance decision electric current decline scope of Rdown.That is: through changing the resistance of locking resistance R down, can obtain different lock current values.

Claims

1. stepper motor driver is segmented in a bipolarity copped wave more, mainly comprises control circuit, input power supply stabilizing circuit, power driving circuit; Wherein control circuit is made up of pulse distributor module, current control circuit module, protective circuit module and output circuit module; Input power supply stabilizing circuit is made up of power supply module, input signal processing module; Power driving circuit is made up of electric current resistance module and power control module; Its notable feature is: in the pulse distributor module of control circuit, use the special integrated chip cycle pulse distributor; It can realize segmentation selection signal when the pulse that receives outside input, direction and enable signal; Current amplitude is selected signal; Thereby the triangular signal (PWM) of output current reference signal (REF) and fixed frequency is to realize Stepping Motor Control.

2. stepper motor driver is segmented in said a kind of bipolarity copped wave more like above-mentioned claim 1; Its notable feature is: through power supply module in the input power supply stabilizing circuit outside supply power voltage is carried out voltage stabilizing, filtering, export simultaneously it is converted into voltage stable, this machine chip work reliably in this internal drive.

3. stepper motor driver is segmented in said a kind of bipolarity copped wave more like above-mentioned claim 1; Its notable feature is: can realize through electric current resistance module and power control module in the power driving circuit: when break impulse is imported; Current value was half the when motor current value can become work; Thereby caloric value minimizing, power reduction, the noise of motor self are reduced, realize the automatic semi-fluid running of motor.