RU2274944C1 - Valve-type inductor-motor drive - Google Patents

Abstract

FIELD: electrical engineering; control systems of valve-type inductor-motor drives for various mechanisms.

SUBSTANCE: proposed valve-type drive that has inductor motor whose phase windings are connected to outputs of transistor switch and six-phase rotor position sensor incorporating six Hall-effect components depends for its operation on generation of control signals by transistor switch due to logic conversion of signals arriving from rotor position sensor with aid of NOT, NAND, AND gates. Such design provides for paired switching of current in electrical-machine phase windings and for maintenance of constant motor speed.

EFFECT: reduced cost and enhanced reliability.

1 cl, 3 dwg

Description

The invention relates to electrical engineering and can be used in control systems of valve inductor electric drives of various mechanisms.

Known inductive induction electric drives containing an electric motor connected to a valve switch, the control circuit of which includes a pulse-width modulator and the corresponding regulators of the parameters of the electric machine, an adder whose inputs are connected to the output of the voltage sensor of the DC link of the valve switch and through the multiplication unit to the subtracting input comparison node, the summing input of which is connected through the unit of calculation of the integral with the output of the adder. The output of the comparison node through the relay element is connected to the input of the unit for calculating the specified switching angle (given position) [1]. The exception of the rotor position sensor is made here by detecting the position by the result of the comparison of flux linkages

The disadvantage of this drive is the error in calculating the flux linkage when integrating the phase voltage, which occurs mainly due to temperature changes in the ohmic resistance of the windings, which manifests itself most strongly at low speeds.

Known valve induction electric drives, consisting of an induction motor, a switch and a developed microprocessor control unit. Due to the special switching control, when the current information on the current value is used to determine the switching angles in any operating mode, this drive refused to use the rotor position sensor [2]. The control of a known electric drive can be implemented on the basis of a microprocessor.

The disadvantage of this drive is the complexity of the control system. Here, the switching control is based on the use of a specially organized "observer" in a system with a relay current regulator and a pulse-width modulation generator that limits the switching frequency of the inverter power switches. In addition, the specified electric drive has difficulties in implementing control in low power drives, where it is necessary to take into account the change in the resistivity of the windings when the temperature changes.

Closest to the proposed technical essence is a valve actuator containing a three-phase synchronous machine, the rotor of which is mechanically connected to the rotor position sensor and the speed sensor, and the armature winding sections are connected to the outputs of the transistor switch, the multiplication unit, the first input of which is connected to the control signal bus, and the second input is connected to the output of the rotational speed sensor, three shapers of the rotor position sensor signals are additionally introduced, a 120-degree signal shaper control, three summing integrators with reset, three threshold elements, three reset pulse shapers, the inputs of which are connected to the first, second and third outputs of the shaper of the rotor position sensor signals, and the outputs are connected to the control inputs of the first, second and third integrators with reset the first inputs of which are combined and connected to the output of the multiplication unit, the second inputs are also combined and connected to the output of the speed sensor, and the outputs are connected to the inputs respectively only the first, second, and third threshold elements, the outputs of which are connected to the second inputs of the first, second, and third logic elements, EXCLUSIVELY, or, the first inputs of which are connected respectively to the first, second, and third outputs of the signal generator of the rotor position sensor, and the outputs are connected to the inputs of the logical shaper 120-degree switch control signals [3].

The disadvantage of this drive is the presence of a speed sensor, a multiplication unit, summing integrators with a reset, threshold elements and reset pulse shapers.

The objective of the invention is to simplify the circuit and design of the electric drive.

The problem is solved by the development of a valve inductor electric drive containing a three-phase valve inductor electric motor, the phase windings of which are connected to the transistor switch, an electric motor start-up block connected to the control inputs of the transistor switch through a switching element, and a rotor position sensor composed of six Hall elements placed on the motor stator. The output of each Hall element is connected to the input of one of the six logic elements NOT. The outputs of the first and second logic gates are NOT connected to the inputs of the first logical gate AND NOT, the outputs of the third and fourth logic gates are NOT connected to the inputs of the second logic gate AND NOT, the outputs of the fifth and sixth logic gates are NOT connected to the inputs of the third logic gate AND . The output of the first logical element AND is NOT connected to the second inputs of the first and fourth logical elements AND, the first inputs of which are connected respectively to the outputs of the third and fifth logical elements NOT. The output of the second logical element AND is NOT connected to the second input of the second logical element AND and to the first input of the fifth logical element AND, the first input of the second logical element AND is connected to the output of the second logical element NOT, the second input of the fifth logical element AND is connected to the output of the sixth logical element NOT. The output of the third logical element AND is NOT connected to the second input of the third logical element AND and to the first input of the sixth logical element And, the first input of the third logical element And is connected to the output of the first logical element NOT, the second input of the sixth logical element AND is connected to the output of the fourth logical element NOT. The output of the first logical element And through the switching element is connected to the first control input of the transistor switch, the output of the second logical element And through the switching element is connected to the second control input of the transistor switch, the output of the third logical element And through the switching element is connected to the third control input of the transistor switch, the fourth output logical element And through a switching element connected to the fourth control input of the transistor switch, output One of the fifth logical element AND is connected through the switching element to the fifth control input of the transistor switch, the output of the sixth logical element And through the switching element is connected to the sixth control input of the transistor switch.

In Fig.1 shows a diagram of an electric drive that implements the processing of signals from the rotor position sensor and receiving 120-degree control signals of the transistor switch, Fig.2 - timing diagrams of signals from a six-phase rotor position sensor on the Hall elements; figure 3 is a timing diagram of a 120-degree control signal transistor switch.

The inductive induction electric drive comprises a three-phase inductive induction motor 1, the phase windings of which are connected to the transistor switch 2, an electric motor start-up block 3 connected to the control inputs of the transistor switch 2 through a switching element 25, and a rotor position sensor composed of six Hall elements 4-9 placed on motor stator 1, the output of each Hall element 4-9 is connected to the input of one of the six logic elements NOT 10-15, the outputs of the first 10 and second 11 logic elements E are connected to the inputs of the first logical element AND 16, the outputs of the third 12 and fourth 13 logic elements are NOT connected to the inputs of the second logical element AND 17, the outputs of the fifth 14 and sixth 15 logic elements are NOT connected to the inputs of the third logic AND 18, the output of the first logical element AND 16 is connected to the second inputs of the first 19 and fourth 22 logical elements AND, the first inputs of which are connected respectively with the outputs of the third 12 and fifth 14 logic elements NOT, the output of the second logical element AND 17 is connected to the second input of the second logic gate And 20 and to the first input of the fifth logic gate And 23, the first input of the second logic gate And 20 is connected to the output of the second logic gate HE 11, the second input of the fifth logic gate And 23 is connected to the output of the sixth logic gate NOT 15, the output of the third logical element AND-NOT 18 is connected to the second input of the third logical element And 21 and to the first input of the sixth logical element And 24, the first input of the third logical element And 21 is connected to the output of the first logic of an element NOT 10, the second input of the sixth logical element AND 24 is connected to the output of the fourth logical element NOT 13, the output of the first logical element And 19 through the switching element 25 is connected to the first control input of the transistor switch 2, the output of the second logical element And 20 through the switching element 25 connected to the second control input of the transistor switch 2, the output of the third logical element And 21 through the switching element 25 is connected to the third control input of the transistor switch 2, the output h of the fourth logic element AND 22 through the switching element 25 is connected to the fourth control input of the transistor switch 2, the output of the fifth logic element And 23 through the switching element 25 is connected to the fifth control input of the transistor switch 2, the output of the sixth logic element And 24 through the switching element 25 is connected to the sixth the control input of the transistor switch 2.

Valve induction drive operates as follows. Start-up is carried out using the start-up unit 3. After the engine is accelerated to the required speed, the start-up unit 3 is turned off and the control unit is turned on in steady state. The generated signals U1-U6 from the outputs of two triads 4-6 and 7-9, shifted relative to each other by 30 el. grad., sensitive elements of the rotor position sensor with a duration of 150 el. hail. (figure 2), shifted relative to each other inside the triad by 120 el. grad., through the logical elements NOT 10-15 enter the inputs of the logical elements AND 16-18, at the output of which are formed three sequences of pulses with a duration of 180 el. hail., shifted relative to each other by 120 e. grad., by means of logical multiplication by blocks 19-24 of these signals by inverted signals from the rotor position sensor at the output of logical elements AND, the transistor switch control signals T1-T6 are generated (Fig. 3).

The specified embodiment of a valve induction electric drive allows you to get a pair of switching current in the phases of the induction motor and maintain a constant speed of rotation of the motor. The electric drive system has a lower control system cost due to the elimination of a complex microprocessor control system and speed sensor.

Information sources

1. RU 2069034 C1, 11/10/1966.

2. Ilyinsky N.F., Bychkov M.G. Valve-inductor drive for light electric vehicles. // Electrical Engineering. 2000, No. 2, p. 28-31.

3. SU 1744769 A1, Valve actuator, MKI N 02 K 29/14. Publ. 06/30/1992. Bull. Number 24.

Claims (1)

A valve actuator comprising a three-phase AC motor, the phases of the stator winding of which are connected to the outputs of the transistor switch, a rotor position sensor, the outputs of which are connected to the driver unit of 120-degree control signals, characterized in that the alternating current motor is made by a valve inductor, the electric motor starting unit is connected with the control inputs of the transistor switch through a switching element, the rotor position sensor is composed of six elements X alla, each of which is connected to the input of one of the six logic elements NOT, the outputs of the first and second logical elements are NOT connected to the inputs of the first logical element AND, the outputs of the third and fourth logic elements are NOT connected to the inputs of the second logical element AND, outputs of the fifth and sixth logical elements are NOT connected to the inputs of the third logical element AND, the output of the first logical element AND is NOT connected to the second inputs of the first and fourth logical elements AND, the first inputs of which are connected respectively, with the outputs of the third and fifth logical elements NOT, the output of the second logical element AND is NOT connected to the second input of the second logical element And and the first input of the fifth logical element And, the first input of the second logical element And is connected to the output of the second logical element NOT, the second input the fifth logical element AND is connected to the output of the sixth logical element NOT, the output of the third logical element AND is NOT connected to the second input of the third logical element And and to the first input of the sixth logical about the AND element, the first input of the third logical element AND is connected to the output of the first logical element NOT, the second input of the sixth logical element AND is connected to the output of the fourth logical element NOT, the output of the first logical element AND is connected through the switching element to the first control input of the transistor switch, the output of the second the logical element And through the switching element is connected to the second control input of the transistor switch, the output of the third logical element And through the switching element with connected to the third control input of the transistor switch, the output of the fourth logic element And through the switching element is connected to the fourth control input of the transistor switch, the output of the fifth logic element And through the switching element is connected to the fifth control input of the transistor switch, the output of the sixth logic element And through the switching element is connected to the sixth control input of the transistor switch.

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