SU1270861A1 - Control device for reversible induction two-phase motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric machine automation systems. The aim of the invention is to expand the range of smooth speed control and improve weight and size parameters. A device for controlling a reversible asynchronous two-phase motor (BP) 7 contains a pulsed semiconductor converter 1 consisting of three diodes.

Description

but transistor switches (K) 2, 3, 4 AC. By 2, 3, 4, they are interconnected sequentially and are intended for dp connections to a DC source. The windings 5.6 HELL 7 are connected to K 3.4. The control circuits K 2,3,4 are connected to the control circuit 8. Circuit 8 contains input points, the outputs of which are connected to the inputs of the input signal polarity indicator and the absolute value block of the input signal. The output of the phase shift block is connected to the first inputs of the comparison blocks, the second inputs of which are connected to the output of the block forming the absolute value of the input signal. The outputs of the indicator and comparison units are connected to the inputs of the control pulse distribution unit. The outputs of the control pulse distribution unit are connected to one input of the galvanic isolating and amplifying control pulses through the control and protection unit and to two other inputs of the galvanic isolating unit directly, the outputs of which are the outputs of circuit 8. In the absence of an input signal of the setting device .9 () windings 5.6 AD 7 will be shorted, because K 2 will be closed. Blood pressure 7 is inhibited without energy consumption.

If there is an input signal of positive polarity (and, 0) in the time interval c (.. 2, the winding 5 BP 7 will be under voltage, since K 2 and 4 are open, and K 3 is locked. In the interval o (included 2,3, and K 4 is locked and under voltage the winding 6. During the next half-wave of the supply voltage, the processes in the device are repeated and negative stator voltage pulses will be generated in the windings 5,6 HELL 7. control pulse distribution unit. With this device, metric bilateral quarter-wave pulse-width modulation of sinusoidal supply voltage, providing the angle of phase shift between the voltages (currents) of the stator windings of the arterial voltage necessary for the operation of BP 7. For the first harmonic components of the voltages (currents), this angle is close to 90 ° and maintained constant for all operating modes of the arterial pressure, which makes it possible to eliminate the power phase-shifting capacitor. Ensuring the uninterrupted stator current at constant forms and values of stator voltage leads to an increase in linearity BP mechanical characteristics 7. 5 yl.

The invention relates to electrical engineering, in particular, can be used in electromotive automation systems.

The aim of the invention is to expand the range of smooth control of the rotational speed of an asynchronous two-phase motor and to improve the weight and size parameters.

FIG. 1 shows a diagram of a pulsed semiconductor transform along with an asynchronous two-phase motor; in fig. 2 control circuit diode-transistor to;: Aochi; in fig. 3 - time diagrams; in fig. 4 - table with the switching algorithm of the diode-transistor switches; in fig. 5 - mechanical characteristics of the engine.

A device for controlling a reversible asynchronous two-phase motor (FIG. 1) comprises a pulse semiconductor converter 1,

consisting of three diode-transistor switches of alternating current 2, 3 and 4, connected in series with each other and intended to be connected to an alternating voltage source, while two of them, for example 3 and 4 diode-transistor switches, are connected to windings 5 and 6 two-phase asynchronous motor 7, the device for controlling the motor contains

also control circuit 8.

The control circuit 8 (Fig. 2) locks the input signal 9 from the generator, phase shift 10, two comparison blocks 11 and 12, the input signal polarity indicator 13, the absolute value generating unit of the input signal 14, the pulse distribution unit 15, the control block protection 16 and galvanic isolation and amplification of control pulses 17, while the inputs of the polarity indicator of the input signal 13 and the block forming the absolute value of the input signal 14 are combined and connected to the setpoint of the input signal 9, the output the polarity indicator of the input signal 13 is connected to the first input of the control pulse distribution unit 15, the output of the absolute value generating unit of the input signal 14 is connected to the first inputs of the first and second comparison blocks 11 and 12, the second inputs of which are connected to the first and second terminals of the phase shift unit 10 , and the outputs of the comparison units 11 and 12 are connected respectively to the second and third inputs of the control pulse distribution unit 15, which consists of five logical elements I-NE 18-22 and two logical elements in EXCLUSIVE OR 23 and 24, with this, the inputs of the first logical element AND-NOT 18 are interconnected and connected to the first inputs of the second and third logical elements AND-NOT 19 and 20, forming the first input of the control pulse distribution unit 15, the second input The second logical element AND-NOT 19 is connected to the first input of the fourth logical element AND-NO 21, forming the second input of the control pulse distribution unit 15, the second input of the third logical element AND-NO 20 is connected to the first input of the fifth logical element AND-NOT 22, image tr This input of the control pulse distribution unit 15, the output of the first logical element AND-NOT 18 is connected to the second inputs of the fourth and fifth logical elements AND-NOT 21 and 22, the outputs of the second and fifth logical elements AND-NOT 19 and 22 are connected to BXO give the first logical element EXCLUSIVE OR 23, the outputs of the third and fourth logical elements AND-NOT .20 and 21 are connected to the inputs of the second logical element EXCLUSIVE OR 24, the outputs of the logical element EXCLUSIVE OR 23 and 24 form two outputs of the pulse distribution unit

15, which are connected to two inputs of the control and protection unit 16, made on the NAND logic element, the output of the control unit and the protection 16, and the two outputs of the control pulse distribution unit 15 through the control and amplification unit 17 are connected to the control units the inputs of the three diode transistor keys AC 2.3 and 4.

A device for controlling a reversible asynchronous two-phase motor operates as follows.

Claims (1)

In the absence of a setting signal 9 () at the output of the polarity indicator 13, a logical O signal is generated. The zero signal will also be at the output of the block forming the absolute value of the input signal 14. As a result of adding the reference voltages of the phase shift unit 10 with the zero signal of the block 14 at the output of the blocks Comparing 11 and 12, we obtain voltages with a fill factor of one. These two voltages and the logical O signal from the output of block 13 are fed to the second, third and first inputs of the control pulse distribution unit 15, respectively. At the outputs of the AND-HE logic elements 18, 19 and 20, signals of logical 1 are generated. NOT 21 and 22 signals of logical O are formed. At the output of logical elements EXCLUSIVE OR 23 and 24, signals 1 are formed, which are fed to the inputs of the NAND gate of the control and protection unit 16 and the first and second inputs of the galvanic isolation and amplification of impulses control 17. At the output of block 16, a signal O is formed, which is fed to the third input of block 17. Signals 1, coming to the first and second inputs of block 17, are amplified and turn on keys 3 and 4, while the signal O, coming to the third the input of the block 17 locks the key 2. As a result, the windings of the stator 5 and 6 of the engine 7 are disconnected from the power source and short-circuited. If the motor is driven by the applied voltage of the Tvorvals, then with the appearance of a zero input signal, it will brake without energy consumption from the power source. S12 In the presence of an input signal of positive polarity (, Fig. 3), the signal 1 is formed at the output of block 13, and the rectangular voltages are formed at the output of blocks 11 and 12, and U, j are shifted in phase in accordance with the reference voltages mi U || At IJ 3 block 10 and having the same fill factor, determined by the level of the input signal U.,. In / 1-4 time interval tOt-iof (Fig. 3), signals will be received on the first and third inputs of block 15, and U ,, 2, equal to 1, and to the second input - signal and, equal to O. In As a result of operation of block 15, its second output will be a signal C equal to 1, and at the first output a signal U equal to O. At block 16 you will receive a signal 11, equal to 1. After passing these signals through block 17, keys 2 and 4 will included, and key 3 locked. As a result, in the time interval under consideration (o, u3t), a voltage Uj will be applied to the stator winding 5 (Fig. 3). In the time interval o; operation of blocks 15, 16 and 17, as well as pulse converter 1 will be similar to the case with a zero input signal, i.e. windings 5 and 6 are short-circuited and; disconnected from power source. In the time interval: o (the first and second inputs of block 15 will receive signals 1 and the third input will be signal O. As a result of the operation of block 15, its first output will be signal 1, and on the second, O, at the output of block 16 There will be a signal 1. After these signals pass through block 17, keys 2 and 3 will be turned on, and key 4 is locked. As a result, the voltage Ug is applied to the stator winding 6 (Fig. 3) in the considered time interval (s /, ()). During the next half-wave of the supply voltage, the processes in the control device are repeated. And in the windings 5 and 6 of the motor 7 b negative stator voltage pulses will be generated.When the polarity of the input signal changes, in order to reverse the motor, it is necessary to switch between the passage channels of the key control signals 3 and 4. In this device, this operation is performed using block 15. In this case, the output of the field indicator the input signal 13 instead of 1, the signal O appears, which is fed to the first input of the block 15, providing on the first and second outputs of the signal the opposite of one another in the considered time intervals (o (, oOt o (j and u) t with (c) with a positive input signal. This in turn leads to the reverse order of the stator phases, which ensures the reverse of the engine. The algorithm for operating the keys during the power supply half-period (Fig. 4) is given for the forward (upper symbols of the switched on (B) or locked (3) keys state) and the reverse (lower symbols) of the direction of rotation of the rotor of the engine. In comparison with the mechanical characteristics of linearity in FIG. Figure 5 shows the curves of rotational speed versus torque on the shaft of an asynchronous two-phase motor of type АДП-362, taken under control from the considered device (solid curves) and with amplitude-phase one -sample of exact (capacitor) control (dashed curves). The value of the stator voltage depends on the width of the output pulses, which in turn increases with increasing absolute value of the input signal. At the maximum input signal, the width of the voltage pulses in the stator windings reaches about 90 ° with the installation (using block 10) initial displacement for the winding of the stator 5 in area 4045 and accordingly in area 140135 ° for winding 6. With the help of a reversing asynchronous control device a two-phase motor performs a symmetrical two-sided quarter-wave pulse-width modulation of the sinusoidal supply voltage, providing the angle of phase shift between the voltages necessary for the motor to operate (then kam) motor windings -: Dp of the first harmonic components of stator winding voltages (currents) of the stator current, this angle is close to 90 ° and does not change when the input signal changes and the operating mode of the engine is changed. Thus, the proposed device makes it possible to exclude a power phase-shifting capacitor from the motor control circuit and thereby improve the weight and dimensions. Eliminating the phase-shifting capacitor and providing the stator current with constant form and constant values of the motor stresses by means of the device which in turn expands the range of smoothly controlled rotational speed. Apparatus of the Invention A device for controlling a reversible asynchronous two-phase motor consisting of a pulsed semiconductor converter connected to a control circuit comprising a phase shift unit, a comparison unit, a galvanic isolating and amplifying control pulses and an input signal adjuster, as such that, in order to expand the range of smooth speed control, rotate the induction motor and improve the weight and size parameters, the pulse semiconductor transducer The spruce is made in the form of three alternating current diode-transistor switches connected in series with each other, two of them are connected in parallel with one stator winding of an asynchronous motor, the input signal polarity indicator is inserted into the control circuit, the input signal absolute value generating unit , the second comparator unit, the control pulse distribution unit, the control unit and protection unit, and the phase shift unit is equipped with a second output, while the inputs of the input signal polarity indicator ib about. When the absolute value of the input signal is combined and connected to the input signal adjuster, the output indicator of the input signal is connected to the first input of the control pulse distribution unit, the output of the absolute value forming unit of the input signal is connected to the first inputs of the first and second comparison blocks, the second inputs of which are connected to the first and second terminals of the phase shift unit, and the outputs of the comparison units are connected respectively to the second and third inputs of the pulse distribution unit The control unit, which consists of five logical elements P1-NOT and two logical elements EXCLUSIVE OR, while the inputs of the first logical element AND-NOT are interconnected and connected to the first inputs of the second and third logical elements AND-NOT, to form the first input of the block distribution of control pulses, the second input of the second logical element AND-NOT connected to the first input of the fourth logical element of the IS-NOT, forming the second input of the distribution unit of control pulses, the second input of the third logical element of AND-NOT connected to the first input of the fifth NAND logical element, forming the third input of the control pulse distribution unit, the output of the first NAND logical element is connected to the second inputs of the fourth and fifth NAND logical elements, the outputs of the second and fifth I AND logical elements NOT connected to the inputs of the first logical element EXCLUSIVE OR, the outputs of the third and fourth logical elements are NOT connected to the inputs of the second logical element EXCLUSIVE OR, the outputs of logical elements EXCLUSIVE OR form two outputs Yes, the control pulse distribution unit, which are connected to two inputs of the control and protection cell, performed on the NAND logic element, the output of the control unit and protection unit, and two outputs of the control pulse distribution unit, through the galvanic isolation and gain control pulses, are connected to control inputs three diode transistor keys of alternating current. Fi.Z Ш1 -wt Fi84 . 800 f200 / boA 2000 gsm Fa y