SU1403331A1 - Stepping motor control device - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control stepper motors. The purpose of the invention is to increase efficiency. A device for controlling a stepper motor contains a source of direct current 1 connected through separation diodes 2 with phase windings 7-10 of the motor, forcing circuits containing diodes 3-6, key elements 17-20, inductances 21, 22 and common power supply bus. The other plates capacitors 11 and 12 through the second key element 18 and inductance 21 are connected to each other, and the capacitor 12 is also connected through an additional key element 17 with a common point of the corresponding group of non-simultaneously switched on phases 8, 10, and the capacitor 11 through separation diodes 3, 4 is connected to the engine phase clamps. When switching the phases of the stepper motor to the switched on phase, the capacitor 12 is discharged, thereby increasing the current with an optimal forcing factor. The disconnected phase, due to the energy stored in its magnetic field, charges the capacitor 11, thereby forming the current formed at the maximum speed. The efficiency is increased due to an increase in the moment of the switched on winding with an optimal degree of force and the simultaneous rapid decrease in the moment of the disconnected winding. C $ (L s oo with 00

Description

The invention relates to the control of electric machines and can be used to control stepper motors.

The purpose of the invention is to increase efficiency.

FIG. 1 is a schematic diagram of the proposed device; in fig. 2 is a voltage and current diagram illustrating the operation of the device. Q

The device (Fig. O contains source 1 of direct current, separator diodes 2, discharge diodes 3-6, (United with phases 7-10 of the engine, 1 (: capacitors 11-14, reverse diodes 15 15 li 16, the key elements, inductance 21 and 22, the main keys 3-26. The phases of the engine are divided into

 eight

in14033312

decrease} (diagrams of the interval, Fig. 2).

With the arrival of the next manager

with impulse (moment t, fig. 2)

thyristor 18 is unlocked. The capacitor 11 charged in the previous cycle, the polarity of the voltage of which is indicated in the diagram (Fig. 1), begins to discharge from the circuit: a key element (thyristor) 18, inductance 21, capacitor 12. As a result, the capacitor 12 is charged voltage, the polarity of which is indicated in the diagram (Fig. 1) (Uit diagram, U. 1 13 interval (j, Fig. 2). Inductance 21 limits the current surge when recharging capacitors 11 and 12. After the value of 5, the capacitor 11, charged in the previous cycle, is polarized which is shown in the diagram (fig. 1), it starts to discharge along the circuit: the key element (thyristor) 18, inductance 21, capacitor 12. As a result, the capacitor 12 is charged by the voltage, the polarity of which is indicated in the diagram (fig. 1) (Uit diagram, U. 1 13 spacing (j, Fig. 2). Inductance 21 limits the inrush current when recharging capacitors 11 and 12. After the values of the voltages on the junction pynnM, each of which is

The phases 7 and 9, which are simultaneously switched on at the same time, 20 are compared by capacitors 11 and 12, and $ 10, having an objec- tive point, is connected to the locker. With the arrival barely

ilyio through a separation diode 2 with a source of 1 power supply. Other phase leads

g groups are connected to the main keys

213-26, and through the discharge diodes 3-6 -

Ci capacitors 11-13. Conclusions of the first

capacitors 11 and 13 are connected to

B: second capacitors 12 and 14 through

Consistently connected second

Key elements 18 and 20 and inductive 30 current rise and duration

n; spine 21 and 22, respectively. Conden- sion of the forced fall of the non-direct control pulse current The operation of the device is repeated. When switching phases 7 and 9 of the engine, the forced decrease and increase of current in the phases are provided by capacitors 13 and 14. Such an embodiment of the device as compared with the prototype allows choosing the duration of the forsyro process 8

the interistor 18 is unlocked. The capacitor 11 charged in the previous cycle, the polarity of the voltage of which is indicated in the diagram (Fig. 1), starts to discharge along the circuit: the key element (thyristor) 18, inductance 21, capacitor 12. As a result, the capacitor 12 is charged voltage the polarity of which is indicated in the diagram (Fig. 1) (Uit diagram, U. 1 13 interval (j, Fig. 2). Inductance 21 limits the inrush current when recharging capacitors 11 and 12. After the voltage values on current increase and duration

Following the control pulse, the operation of the device is repeated. When switching phases 7 and 9 of the engine, the forced decline and increase of current in the phases are provided by capacitors 13 and 14. Such an embodiment of the device as compared with the prototype allows choosing the duration of the forcing process

Ators 12 and 14 are connected to the common points of the phases of the group through the first key elements | pements 17 and 19.

The device works as follows.

When one of the phases of the stepping motor is turned off, and the other is turned on, for example, phase 8 is turned off, and phase 0 is turned on, when the key element 26 is closed (time diagram t in Fig. 2), the precharged capacitor 12 begins to discharge through an additional key element (thyristor) 17 and phase 10 of the motor, thereby performing a forced rise in the on phase 10. After the voltage on the capacitor 12 decreases to the value of the power supply voltage, the thyristor 17 is locked (diagrams U, 2, I mom nt time t, fig. 2). Due to the magnetic energy stored in the magnetic field of phase 8, the forced charge of the capacitor 11 through the discharge diode 4 and the current, the reverse diode 16 occurs and is carried out in phase 8, independently of each other. Thus, the simultaneous provision of optimal laws of forced rise and fall of current is achieved, which increases the efficiency of the electric motor due to more rational use of the energy accumulated in the phase of the engine.

Claims (1)

Invention Formula A device for controlling a stepper motor, containing a constant voltage source connected to the phases of the engine through separation diodes, main switches for the number of phases, forcing circuits connected to groups of non-simultaneous-switched phases, each forcing circuit includes a first capacitor, two key elements and a discharge diodes connecting within each group the phase outputs to the first capacitor corresponding to the boost circuit, characterized in that, in order to increase efficiency, each boost circuit has The inductor and the second capacitor, the phases of one group have a common point connected  1403331 the first key element with the second capacitor and the second key element capacitor, which through an induk-connected to the first capacitor.