CN111146998A - Single-phase alternating current powered switched reluctance motor control system - Google Patents

Abstract

The invention belongs to the field of motor control, and particularly relates to a single-phase alternating-current powered switched reluctance motor control system which comprises an m-phase switched reluctance motor, a power converter, a single-phase alternating-current power supply, a logic gate circuit, a Hall position sensor and a voltage sensor. In the power converter, each phase of winding is connected with a power switch in series to form a branch, and all the branches are connected with a single-phase alternating-current power supply in parallel; the Hall position sensor outputs m paths of position signals, each path of position signal corresponds to one phase, the inductance slope of a phase winding is positive, the corresponding position signal is high level, and otherwise, the corresponding position signal is low level; the voltage sensor detects the voltage of the single-phase alternating-current power supply, and when the alternating-current voltage changes from negative to positive, the voltage sensor outputs a pulse; the logic gate circuit receives signals from the voltage sensor and the Hall position sensor and outputs control signals of the power switches of all phases, thereby controlling the switched reluctance motor. The control system has the advantages of less power switches and low cost; the control method is simple and reliable, strong in universality and easy to popularize.

Description

Single-phase alternating current powered switched reluctance motor control system

Technical Field

The invention relates to the field of motor control, in particular to a single-phase alternating current powered switched reluctance motor control system.

Background

The switched reluctance motor is a novel electromechanical integrated motor, has the advantages of simple and firm structure, high reliability, good speed regulation performance, low manufacturing cost and the like, is one of research subjects in the field of electric transmission, has been applied to certain fields of mining, aerospace and the like, and shows strong market competitiveness.

Currently, switched reluctance motor control systems are typically powered directly by batteries or indirectly by an ac power source. The alternating current power supply generally adopts an uncontrolled rectifier bridge to rectify alternating current and adopts a capacitor to filter the output voltage of the rectifier bridge to obtain direct current bus voltage. Obviously, the alternating current power supply mode needs a rectifier bridge and a filter capacitor, so that the cost and the volume of the system are increased, and the reliability of the system is reduced.

The invention aims at the problems and provides a single-phase alternating current powered switched reluctance motor control system.

The technical scheme adopted by the invention is as follows:

a single-phase alternating current powered switched reluctance motor control system is composed of an m-phase switched reluctance motor, a power converter, a single-phase alternating current power supply, a logic gate circuit, a Hall position sensor and a voltage sensor.

In the power converter, each phase winding is connected with a power switch in series to form a branch, and all the branches are connected with a single-phase alternating current power supply in parallel.

The Hall position sensor outputs m paths of position signals, each path of position signal corresponds to one phase, the slope of the inductance of one phase is positive, the corresponding position signal is high level, otherwise, the corresponding position signal is low level;

the voltage sensor detects the voltage of a single-phase alternating-current power supply, and when the voltage of the alternating-current power supply changes from negative to positive, the voltage sensor outputs a pulse with a certain width;

the logic gate circuit is composed of m AND gates, one input end of each AND gate receives a signal from the voltage sensor, and the other input end of each AND gate receives Hall position signals of each path respectively. Therefore, when the single-phase alternating-current power supply voltage is changed from negative to positive, the logic gate circuit outputs driving pulses to the power switches of each phase with positive inductance slope, and therefore the control of the switched reluctance motor is achieved.

The invention has the beneficial effects that:

the control system has less power switches and lower system cost; the control method is simple and reliable, has strong universality, is easy to popularize and has a wide application prospect in the field of household appliances.

Drawings

FIG. 1 is a block diagram of the present control system;

FIG. 2 is a system simulation model used by an embodiment of the present invention;

FIG. 3 is a power converter simulation model used in an embodiment of the invention;

FIG. 4 is a logic gate circuit simulation model used by an embodiment of the present invention;

FIG. 5 is a simulated waveform of an embodiment of the present invention;

Detailed Description

The control system is further described below with specific embodiments.

In order to verify the control system, a simulation model of the switched reluctance motor control system is established, as shown in fig. 2, the model mainly comprises 5 units, namely a switched reluctance motor, a power converter, a logic gate circuit, a voltage sensor and a hall position sensor. The switched reluctance motor adopts a three-phase 6/4 pole motor model carried by an MATLAB element library. The single-phase alternating current power supply outputs sinusoidal alternating current with the frequency of 50Hz and the effective value of 220V. Each phase in the power converter is connected in series with a power switch to form a branch, and each branch is connected in parallel with a single-phase ac power supply, as shown in fig. 3. The voltage sensor detects a single-phase alternating-current power supply voltage and outputs a pulse of a certain width when the voltage is changed from negative. The Hall position sensor detects the position of the rotor and outputs three paths of signals, each path of signal corresponds to one phase, when the slope of the phase inductance is positive, the corresponding Hall signal is at a high level, and otherwise, the corresponding Hall signal is at a low level. The logic gate circuit consists of three AND gates, one input end of each AND gate receives an output signal from the voltage sensor, and the other input end of each AND gate is respectively connected with three paths of Hall position signals.

[ example 1 ]

Based on the Simulink simulation model shown in FIG. 2, the control effect of the control system is tested. The load torque is set to 0n.m, the pulse width output by the voltage sensor is set to 1.5ms, and the simulation waveform after the motor enters the steady state is shown in fig. 5.

The control system has the advantages of few power switches, low cost, simple algorithm, easy realization and strong universality, and can realize the control of the switched reluctance motor under the power supply of a single-phase alternating-current power supply.

Claims (1)

1. The utility model provides a single phase alternating current powered switched reluctance motor control system which characterized in that: the control system comprises an m-phase switched reluctance motor, a power converter, a single-phase alternating current power supply, a logic gate circuit, a Hall position sensor and a voltage sensor; in the power converter, each phase of winding is connected with a power switch in series to form a branch, and all the branches are connected with a single-phase alternating-current power supply in parallel; the Hall position sensor outputs m paths of position signals, each path of position signal corresponds to one phase, the slope of the inductance of one phase is positive, the corresponding position signal is high level, otherwise, the corresponding position signal is low level; the voltage sensor detects the voltage of the single-phase alternating-current power supply, and when the alternating-current voltage changes from negative to positive, the voltage sensor outputs a pulse; the logic gate circuit consists of m AND gates, one input end of each AND gate receives a signal from the voltage sensor, the other input end of each AND gate receives a Hall position signal, and when the single-phase alternating-current power supply voltage is changed from negative to positive, the logic gate circuit outputs a driving pulse to each phase of power switch with positive inductance slope, so that the control of the switched reluctance motor is realized.

Images