SU1610592A1 - Method of controlling two-phase stepping motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control machines equipped with two-phase feed drive motors. The purpose of the invention is to simplify implementation and expand operational capabilities by providing a step change in the phase currents with just two incremental values. Due to the cyclogram of the multi-polar phase switching, the method allows to ensure an even distribution of the moment over the entire field, a high accuracy of working out fractional steps. The method is rather simple to implement, as for organizing a stepwise rotation of the vector, only two values of the phase current increments are required. 5 il.

Description

The invention relates to the control of electric machines and can be used in an electric drive with electric crushing of pitch,

A: The purpose of the invention is to simplify the implementation and expand the operational capabilities by stepwise changing the current of the phases from two values. mi prir; eny.

Figures 1 and 2 show timing diagrams of control currents in the phases; FIGS. 3 and 4 are nomograms of the results of two-phase motor torque for cases of the splitting factors of the main step, respectively. and FIG. 5 is a table of some parameters.

The way to control a two-phase motor ™ body is in following

When the split ratio is selected. where n 1,2,3. ,, each

phase two-phase motor (Fig 1.2)

TG I o

during cycles, where K is the coefficient of electrical crushing of the engine’s constructive pitch, is fed with a nominal current of one direction (for example, +1), and the current is gradually reduced

- 31

rungs

about cycles, then for

-, cycles with even K and during K-1

G5 - cycles with odd K stu

short curtain current with steps great

31 chinoy 2. 4fJ rR even K for -.

one cycle off the phase current (for even K and y 0 for odd K), change the direction of the current by

(L

with

Ofi

ate

QD

uh

3

inverse (for example, -1) and in

cycles with even K and

 5 2

in for odd K steps- 5

current with

So

steps l 3

JJ i "-.- av, iirie Og

are great steps

com this direction /

: ;; Szkl gzm go Tti-rT J-4 G-,

ten

support- phase under

0.,

K + 3

 cycles,

then

15

reduce current steps size

 K ™.

A -31 A. 4K

at

current

g cycles, further

K-2

-. for L

cycles with even

K and in

C-flow

K-1

- cycles with odd K reduce the current with steps

- 31. The guise of D2 years; for even K during

One cycle (1 1 for even K and Q 0 for odd K) turns off the phase current, restores the original direction of the current (+1), then

/1 TO

flow with „cycles with even K and

thirty

cycles with odd

for C

Mr. K raises the current steps led

rank

K-3

2K

then for

35

cycles current increase level - 31

A method of controlling a two-phase stepper motor, which includes a phase-phase power supply and a continuous step change in the control currents in phases shifted from one another by a quarter of a period, characterized in that, in order to simplify and expand the operational capabilities by changing the phase current with two steps increment values during (K + 3) / 3 cycles, where K is the electrical factor

k.ami size D., g ...

 Central Committee ...

This completes - the full cycle of the For-40 cycle of constructive pitch of the control of stepped steps, multiple of three, feeds each phase with a nominal current I of one of the replacement currents of the phases of a two-phase motor. As a result, the motor rotor turns around 360 axes with discrete bridges

 . ./.

masked oiap where (khos main

01 The constructive pitch of this engine. Subsequent cycles of forming the control phase currents are similar to the described first cycle.

In the general case, the repetition period of the control step voltages is determined by the expression, and the phase shift between them is determined by the expression (where t is the duration of one phase switching cycle.

For ease of use, the proposed method in the table in FIG. 5 is

45

50

As a result, step-by-step current decreases by 31 / 4K for K / 3 cycles, then for (K-2) / 2 cycles for even K and for () / 2 cycles for odd K, for 31/4 steps 2K, with even K for one clock cycle, the phase current is turned off, the current is reversed and during K / 2 cycles with even K and during (K + 1) / 2 cycles with odd K, the steps of 3I / step are stepped. 2K, then for (K-3) 3 cycles, the current is increased by steps of 31 / 4K, powering the phase with the no-terminal current of another for (K + 3) 3 cycles, then snizha-

five

0

five

0

d

0

five

parameters K, T, b are entered | some values.

When using this method of crushing a step, the geometrical location of the vector distribution of the resultant torque of a two-phase motor with different polarity control is a 12-gon (close enough to the circle, see FIG. 3.4). This indicates that the distribution of the modulus of the vector of the cut-off moment, which ensures high precision of the fractional steps, high uniformity and smoothness.

The method can be quite easily implemented on the basis of modern digital integrated circuits, since it is required to generate only two values of the increment (D | and D2) of the phase currents during their modulation.

Claims (1)

Invention Formula A method of controlling a two-phase stepper motor, which includes a phase-phase power supply and a continuous step change in the control currents in phases shifted from one another by a quarter of a period, characterized in that, in order to simplify and expand the operational capabilities by changing the phase current with two steps increment values during (K + 3) / 3 cycles, where K is the electrical factor .. five 0 As a result, step-by-step current decreases by 31 / 4K for K / 3 cycles, then for (K-2) / 2 cycles for even K and for () / 2 cycles for odd K, for 31/4 steps 2K, with even K for one clock cycle, the phase current is turned off, the current is reversed and during K / 2 cycles with even K and during (K + 1) / 2 cycles with odd K, the steps of 3I / step are stepped. 2K, then for (K-3) 3 cycles, the current is increased by step-; 31 / 4K, they feed the phase with a -nominal current of another direction for (K + 3) 3 cycles, then decrease The current is rung in steps of 3I / 4K for K / 3 cycles, then for (K - 2) 2 cycles for even K and in g for (K-1) 2 cycles for odd K. The current is reduced in steps of: 31 / 2K, with even K for one clock cycle, disconnect the phase current, restore the original direction of the current, then for K / 2 cycles with even i (and for (K + 1) 2 cycles with odd K, increase the current by steps of magnitude 3I / 2K, after which during () 3 cycles, the current is increased by steps of 31 / AK. Q FIG. one Fig.Z FIG. 2 -Ltp r.