SU1418879A1 - Thyratron electric motor - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase energy performance by reducing current consumption and increasing linearity of the adjustment characteristics. The electromechanical unit (EB) 17 of the correction, kinematically connected with the rotor 2 of the synchronous machine (cm) 1, is inserted into the valve motor. The input EB 17 is connected to the output of the modulator 14, and the output of the EB is 17 to the quadrature winding 13 of the rotor position sensor 11. 2 CM 1. As a result, the device provides feedback on the frequency of rotation of the valve motor through the quadrature winding 13 of the excitation. This allows one to take into account the latency in the circuit, consisting of two channels, made of series-connected phase-sensitive phase switches 7 and 8 and power amplifiers 5 and 6, respectively. The inputs of these rectifiers are connected to the sinus 9 and cosine 10 windings of the position sensor 11. The outputs of the power amplifiers are connected to sine 3 and cosine 4 windings of the core SM 1. 2 Cc. f-ly, 3 ill. S (l

Description

1S

/ "

J2

Gw

00

with

with

The invention relates to electrical engineering and can be used to control the frequency of rotation of an electric motor during continuous operation.

The purpose of the invention is to increase the energy performance by reducing current consumption and increasing the linearity of the adjustment characteristics.

FIG. I depicts a functional diagram of the valve motor; in fig. 2 and 3 - electromechanical correction unit, options.

The valve motor contains a two-phase synchronous machine 1 with a permanent magnet on the rotor 2 (Fig. 1) and the core, sinus 3 and cosine 4 windings of which are connected via series-connected power amplifiers 5 and 6 and phase-sensitive terminals 7 and 8 respectively to sine 9 and cosine 10 windings of position sensor 11; NIL, which is equipped with main 12 and quadrature 13 excitation windings.

The main winding 12 is connected via a modulator 14 to a speed setting device 15. The reference input of the modulator 14 is connected to the output of the source 16 of the reference voltage.

In addition, the electric motor contains an electromechanical correction unit 17 with an input 18, an input shaft 19 and an output 20 connected to the quadrature excitation winding 13. The input 18 is connected to the modulator 14, the input shaft 19 is kinematically connected to the rotor 2 of the synchronous machine 1. Furthermore The reference inputs of the phase-sensitive devices 7 and 8 are connected directly to the source 16 of the reference voltage.

Correction block 17 can be performed, for example, in the form of a tachogenerator 21 of direct current (Fig. 2) j, which is an angular velocity sensor of the rotor 2, and a multiplication unit 22, the first input of which forms the input 18 of the correction unit 17, and the shaft The rator is the input shaft 19 of the correction unit. The output of multiplication unit 22 is the output 20 of correction unit 17.

Correction block 17 may also be expanded as an asynchronous tacho-generator (FIG. 3), the rotor 23 of which

ten

thirty

five

20

25

0

five

five

0

five

kinematically connected with the rotor 2 of the synchronous machine I. The excitation winding 24 is input 18 of the correction unit 17, and the generator winding 25 is the output 20 of the correction unit.

The motor works as follows.

Consider the case when the delay in the control circuits of a valve motor is small, i.e. and the voltage on the quadrature winding 13 is not applied. The reference voltage is supplied from the source 16 and the rotational speed is set by the setting device 15. At the same time, the output windings 9 and 10 of the sensor II of the position II generate voltages and alternating current, the envelopes of which are distinguished by phase-sensitive rectifiers 7 and 8 in the form

sin; cos 0,

, K, j.u.

 g where K

U.Kg.K,

and.

(one)

and,

RP

 T1

eleven

transfer coefficients of phase-sensitive rectifiers 7 and 8; the amplitude value of the control voltage corresponding to the voltage at the output of the modulator 14; e P (f is the electric angle of rotation of the sensor 11;

mechanical angle of rotation;

the number of pairs of poles; the transformation ratio of the sensor 11 is position on the side of the main winding 12. The currents in the sections are

 sin0; / „

, Cos0,

where ,

Р - active resistance of sections 3 and 4;

 - transmission coefficient of amplifiers 5 and 6 power. In accordance with the principle of action of a valve electric motor, according to formula (2), the currents form the magnetically-conducting force (MDS) of the stator, the interaction of which with the MDS of the rotor leads to the appearance of torque. In this case, the phases of the currents of the winding of the core do not depend on the frequency of rotation, therefore, such a valve motor has optimal characteristics and does not fit in the setting of the forward switching angle p. This is due to the absence of a delay for control purposes.

If there is a delay for real control purposes, i.e. when, in order to optimize the characteristics of the motor, it is necessary to introduce an angle of SW.

To introduce the switching angle angle / 6, the rotational frequency Q of the rotor 2 is measured by a dc tachogenerator 21 (Fig. 2), or an ac asynchronous tachogenerator 23 (Fig. 3), multiplied in the first case in voltage multiplication unit 22 and and energize the quadrature winding 13 of the sensor 11.

Then for the first case the voltage on the quadrature winding 13 is equal to

and ,, to „.п и.

where K „- block transfer coefficient

17 correction.

When powering two mutually perp-25 diculary windings 12 and 13 of the excitation voltage in the windings 9 and 10 of the sinus-cosine rotary transformer, in accordance with its principle of operation,

, iU V sin 0-K, u, t COS0; , and, d K, aU V where K l is the transformation ratio of the sensor 11 of the position from one hundred to four quadrature winding 13.

arg W3 (ju)) - phase characteristic (phase response);

OJ - frequency of the signal at the input of the amplifier 5.

Frequency response and phase response of the transfer function are equal

IW, (JW) |

arg V. (jw) arctg You. Therefore, taking into account (4)

Then the voltage at the phase of the phase-winding core has the form

a significant score of 7 is equal to, (K ,, U, sine -k, cosG),

where and ,, and and f, are the voltage envelopes

and and „.

As a result of transformations receive

(four)

,, sin (0-p + v).

40

Similarly for current in section 4

., cos (G- / 5 + 4), (

Where

45 V l jSl-KlL-l J (l7b.-Ln f;

VH-T U V i

, sin (9- (i),

 arctg you.

Where

TO,

arctg and

TO,

n

d

(five)

Ml - c ° s / The signals from the rectifiers 7 and 8 then pass through the power amplifiers 5 and 6 and are converted into currents ij and i sections 3 and 4 of the winding of the box. Suppose that in these nodes there is concentrated all the lag of the control circuits, which can be taken into account by the transfer function with a constant time T, having, for example, for section 3

V3 ffi-T

Cs

; + t

(6)

. Kg

where K, -i,

R - section resistance;

P - Laplace operator. In accordance with the properties of the transfer function, the amplitude of the current in section 3 is equal to

, | W3 (jaJ) l, (7)

and its phase is shifted by an angle

have agent (s), (8)

where and is the voltage amplitude at the input of the amplifier 5;

| W3 (jco) - amplitude-frequency response (AFC);

arg W3 (ju)) - phase characteristic (phase response);

OJ - frequency of the signal at the input of the amplifier 5.

Frequency response and phase response of the transfer function (6) are equal

IW, (JW) |

arg V. (jw) arctg You. Therefore, in view of (4) the current in

  winding core has the form

,, sin (0-p + v).

(9)

40

Similarly for current in section 4

., cos (G- / 5 + 4), (10)

Where

45 V l jSl-KlL-l J (l7b.-Ln f; (10

VH-T U V i

 arctg you.

(12)

50

gc Take into account,, I, transform expressions (P), (12) and

(five):.

Ke JH (lSjLKn.fl); (13)

У1 + тЧр „l)

Ln.Jil.

K, g

(14) (15)

From expressions (13) - (15) it follows that the valve electric motor does not have optimal characteristics, since the phases of the currents (- / H-) of the section and the coefficient KC depend on the rotation frequency I

However, if you select the motor parameters from the ratio

,

TR,

h

(sixteen)

then, as follows from (13) - (15),

Kc K3-K7-K, i const, y (17)

The expressions for the currents of sections 3 and 4 in this case take the form (2), i.e. the effect of lag in the control circuit is eliminated.

Thus, the introduction of feedback on the frequency of rotation of the valve electric motor through the quadrature excitation winding of the position sensor allows one to compensate for the delay in the control circuit at any rotational frequency, which leads to an increase in the linearity of the control characteristics and

with the rotor of the synchronous machine and supplied with the main and quadrature windings of the excitation, the first of which is connected to the output of the speed setting unit through the modulator, the reference input of which is connected to the output of the reference voltage source, characterized in that in order to increase the energy performance by reducing the current consumption and increasing the linearity of characteristics, it is equipped with an electromechanical correction unit, kinematically

connected with the rotor of the synchronous machine, the output of which is connected to the quadrature winding of the excitation, and the input is connected to the output of the modulator, and the reference inputs of phase-sensitive output

The drives are connected to the output of the voltage source.

2. An electric motor according to claim 1, characterized in that said correction unit is implemented as a DC tachogenerator and a multiplication unit, the first input of which forms the input of the correction unit, the second input is connected to the output of the tachogenerator, the shaft of which is intended

indices by reducing the consumption of -30 for kinematic connection of the block current current.

Invention Formula

3. The motor according to Claim 3, characterized in that the correction block is made in the form of an asynchronous tachogenerator of alternating current, the excitation winding of which is connected to the first input of the correction block 1. A valve motor containing a two-phase synchronous machine with a permanent magnet on the rotor and the core winding, the sine and cosine sections of which are connected via serially connected amplifiers 40, the outputs of the generator power winding and the phase-sensitive rectifier output the correction unit, and the shaft

The driver, respectively, to the sinus generator and the generator is intended for the kinekosinus secondary windings of the sensor of the mathematical connection of the correction unit from the position, kinematically connected to the rotor of the synchronous machine.

And oSfiomtte / J

.go

with the rotor of the synchronous machine, and the output of the multiplication unit is the output of the correction unit.

3. The electric motor according to claim, which is characterized by the fact that the correction unit is made in the form of an asynchronous tachogenerator of alternating current, the excitation winding of which is connected to the first input of the correction unit, the conclusions of the generator winding form the output of the correction unit, and the shaft

FIG. 2

.

3

/ 2 /;

2Q

N

From the rotor 2 with the ground machine 1

to fw 7

25

17

-Y

I / 9 | X At the rotor 2

 1 iuv lines / § I

I

 CUH lpOHHOU

cars 1

// 2J

Claims (3)

Claim 1. Valve electric motor, 35 containing a two-phase synchronous machine with a permanent magnet on the rotor and the armature winding, the sine and cosine sections of which are connected through series-connected power amplifier 40 and a phaeo-sensitive rectifier, respectively, to the sine and cosine secondary windings of the position sensor "kinematically connected to the rotor of the synchronous machine and equipped with a main and quadrature field windings, the first of which is connected to the output of the speed controller through a modulator, about the input of which is connected to the output of the reference voltage source, characterized in that, in order to increase energy performance by reducing the current consumption and increase the linearity of characteristics, it is equipped with an electromechanical correction unit kinematically connected to the rotor of the synchronous machine, the output of which is connected to the quadrature excitation winding, and the input is connected to the output of the modulator, and the reference inputs of the phase-sensitive rectifiers are connected to the output of the reference voltage source. 2. The electric motor according to π. 1, characterized in that the said correction unit is made in the form of a direct current tachogenerator and a multiplication unit, the first input of which forms the input of the correction unit, the second input is connected to the output of the tachogenerator, the shaft of which is intended for kinematic connection of the correction unit with the rotor of the synchronous machine, and the output of the unit multiplication is the output of the correction block. 3. The electric motor according to π. 1, characterized in that the correction unit is made in the form of an asynchronous tachogenerator of alternating current, the excitation winding of which is connected to the first input of the correction unit, the outputs of the generator winding form the output of the correction unit, and the tachogenerator shaft is designed for kinematic connection of the correction unit with the rotor of the synchronous machine. Phi2. 2