KR970004273A - Switched reluctance motor - Google Patents

Abstract

The present invention relates to a circuit for controlling the residual current or the trailing current attenuation when switching from a valid phase to an invalid phase in a single phase or multiphase switched reluctance motor. In the present invention, the Hall effect sensor detects the position of the rotor of the switched reluctance motor. If the phase winding of the motor is an effective section, current flows to the phase winding line, and if the phase is invalid, the current flow to the phase is attenuated to zero. The semiconductor switch causes a current to flow in the phase winding when the phase becomes an effective section, and redirects the residual energy in the phase winding between the energy recovery circuit and the energy emitting circuit when the phase becomes invalid. The pulse width modulated signal generator supplies a pulse width operational signal to the switch to allow current to flow first in the phase winding and then between the energy recovery circuit and the energy dissipation circuit. A control module or microprocessor having a pulse width modulated output controls the operation of the pulse width modulated signal generator in accordance with information about the position of the rotor. The signal generator provides a set of pulse width modulated signals with a single characteristic when the current is input to the phase winding, and a pulse width modulated signal with a different set of characteristics when there is no current flow to the phase winding. This alternates between a zero volt section and a forcedly rectified residual current attenuation section while the phase is ineffective. During the attenuation period, both the pulse width modulation frequency and the duty cycle of the pulse are varied, resulting in current attenuation, which eliminates ringing and motor noise.

Description

Switched reluctance motor

Since this is an open matter, no full text was included.

FIG. 4A is a diagram showing a gate signal used for soft chopping in a section in which a power is on in a switched reluctance motor, and (B) is a diagram schematically showing a circuit when power is on in the above phase. ) Is a schematic representation of a circuit when the phase is off, i.e., a current decay period, and FIG. 5 (a) is an inverted gate signal used when the phase is off in an operating mode of a switched reluctance motor, (B) and (c) show a soft chopping circuit and a hard chopping circuit for current attenuation, respectively. FIG. 6 is a diagram showing a first embodiment of the rear end current attenuation control circuit of the present invention. Shows a signal generation module for generating an operating signal used to provide hard and soft chopping of the trailing current, and (b) an operation used for providing hard and soft chopping. Diagram showing the microprocessor having a pulse width modulated output capability to generate an arc.

Claims (26)

Sensing means for detecting that a current flows in the phase winding line when the phase of the switched reluctance motor appearing in the phase winding is in an effective section, and the current flowing in the phase winding line is stopped when the phase is in an invalid section; Switch means for allowing current to flow in the phase winding line if the phase is an effective section and for recovering or releasing energy from the windings if the phase is invalid; Signal generating means for supplying an operation signal to said switch means for controlling the flow or recovery of current and energy; The signal generating means is controlled according to the output signal of the sensing means so that the signal generating means generates an operation signal having different operating characteristics when the valid period and the invalid period are generated. Control means for controlling the frequency and duty cycle of the operating signal to control the attenuation rate of the current and thus the noise of the motor, in the control means for restoring or releasing the voltage. Residual current attenuation control circuit. 2. The single phase of claim 1, wherein the switch means comprises first and second sets of switches positioned at both sides of the phase winding line to activate a set of switches if the phase is a valid section, and deactivate if the phase is an invalid section. Or residual current attenuation control circuit of a multiphase switched reluctance motor. The single-phase or polyphase of claim 2, wherein the second set of switches is modulated by an operation signal output from the signal generating means such that the operation of the second set of switches is controlled as a function of signal characteristics of the operation signal. Residual current attenuation control circuit for switched reluctance motors. 4. The residual current of a single phase or polyphase switched reluctance motor according to claim 3, wherein said signal generating means comprises a pulse width modulated signal generator in which the pulse width and frequency of an output signal are a function of the operating characteristics of said switched reluctance motor. Attenuation control circuit. 5. The residual current attenuation control circuit of claim 4, further comprising a capacitor connected in series with the phase winding line and charged by a current to recover a part of energy when the phase becomes an invalid section. The pulse width generated by the signal generating means from the pulse width modulation operation signal when the phase is a valid section according to a signal input from the sensing means when the phase becomes an invalid section. Residual current attenuation control circuit in a single-phase or multiphase switched reluctance motor that reverses the pulse width of a modulated operation signal. 7. The single phase or polyphase of claim 6, wherein the control means controls the signal generator to control soft chopping of the trailing current during one period of the pulse period and to generate an operating signal that provides hard chopping for the remaining period of the period. Residual current attenuation control circuit for switched reluctance motors. 8. The first set of switches according to claim 7, wherein a control signal is supplied from the pulse width modulated signal generated by the signal generating means to each set of switches by supplying a pulse width modulated signal so that the first set of switches is turned off when the phase is invalid. And a gate means for deactivating and modulating the switching of the second set of switches in accordance with the characteristics of the pulse width modulated signal. 4. The residual current attenuation control circuit of claim 3, wherein the first and second sets of switches each comprise a pair of semiconductor switches connected in parallel. 10. The apparatus of claim 9, further comprising a power supply means for each set of switches comprising a transformer for dropping the line voltage supplied to the switched reluctance motor, and a voltage adjusting means for adjusting the dropped voltage. Residual current attenuation control circuit of single-phase or multiphase switched reluctance motor. The residual current attenuation control circuit of claim 1, further comprising rectification means for full-wave rectifying the phase voltage applied to the winding. 2. The residual current attenuation control circuit of claim 1, wherein the sensing means comprises a hall effect sensor. 2. The apparatus of claim 1, wherein the control means includes a microprocessor that receives an input signal associated with an operating characteristic of the switched reluctance motor and controls a signal characteristic of an operating signal generated by the signal generating means as a function of the input signal. Residual current attenuation control circuit of a single-phase or multiphase switched reluctance motor. Current and voltage are supplied to the phase windings during each phase where the phases are valid, and if the phases are invalid, the current and voltage are cut off so that the energy of the phase windings is recovered or released at 0 volts. CLAIMS 1. An apparatus for controlling trailing current attenuation in a phase winding of a reluctance motor, comprising: a bus capacitor for storing energy recovered from the phase winding; The first and second sets of switches, wherein the first set of switches is connected to one side of the phase winding line and the second set of switches is connected to the other side of the phase winding line, so that the phase winding is connected to the bus when the phase becomes an invalid section. Switch means for connecting to a circuit including a capacitor; Power discharging means connected in series with the winding wire; Sensing means for detecting a position of the rotor of the switched reluctance motor; Providing an operating signal to the switch means for alternately switching the phase winding to a circuit comprising a circuit including the bus capacitor and a power dissipating means, the operating signal to provide hard chopping and soft chopping of current. Signal generating means used to modulate the state of one set of said switch sets; Controlling the operation of the signal generating means in accordance with the output signal of the sensing means to provide an operation signal having one set of signal characteristics if the valid period and an operation signal having another set of signal characteristics if the phase is an invalid period And a control means for causing a zero volt energy recovery and release of the trailing current and controlling the frequency and duty cycle of the operating signal to cause the recovery and release of the trailing current and to remove noise of the motor. 15. The pulse width of the operation signal according to claim 14, wherein the control means controls the signal generating means to maintain one of the two sets of switches in a shorted state during a subsequent current attenuation period and to apply the other set of switches. Switching to open and short at a rate controlled by the switch so that a trailing attenuation current is soft choked when the switch is shorted and hard chopped when the switch is opened. 16. The apparatus of claim 15, wherein said signal generating means comprises a pulse width modulated signal generator for outputting a signal in which the pulse width and frequency of an output signal are a function of the operating characteristics of a switched reluctance motor, wherein said control means comprises said phase invalid period. And a rear end current attenuation control device for reversing the duty cycle of the pulse width modulated signal generated by the signal generating means when the phase is a valid section, in response to a signal input from the sensing means. 17. The apparatus of claim 16, further comprising gate means for each set of switches to which a pulse width modulated signal is supplied, wherein the gate means deactivates the first set of switches if the phase is invalid. And inducing a control signal from each of said pulse width modulated signals to each set of switches to modulate switching of said second set of switches. 15. The back-end current attenuation control circuit according to claim 14, wherein said sensing means comprises a hall effect sensor. 15. The apparatus of claim 14, wherein the control means includes a microprocessor that receives a signal related to an operating characteristic of a switched reluctance motor and controls a signal characteristic of an operating signal generated by the signal generating means as a function of the input signal, And the microprocessor adjusts both the frequency and duty cycle of the pulse width modulated signal. Current and voltage are supplied to the phase windings during each phase where the phase is valid, and if the phase is invalid, the current and voltage supplied to the phase winding are cut off so that the energy of the phase winding is recovered or released at 0 volts. A method of controlling a trailing current attenuation in a phase winding of a reluctance motor, the method comprising: switching the phase winding to a circuit comprising a bird capacitor for storing current for recovery of energy while the phase is ineffective. Switching the phase winding line to a circuit comprising a second set of switches, the set of switches being connected to one side of the winding wire and the other set of switches being connected to the other side of the winding wire; Alternately switching the phase windings to an energy discharging circuit to release a portion of energy, and the phase windings switching between circuits for a plurality of sections to attenuate current in a predetermined manner; Detecting the position of the rotor of the switched reluctance motor when the phase is invalid; Generating and supplying an operation signal to said switch means to cause switching of said phase winding between said bus capacitor circuit and an energy discharging circuit; By modulating the operation of one set of switches to an operation signal, the set switches are short-circuited in all sections when the phase is invalid, and the other set of switches is modulated by the signal characteristics of the operation signal. In each section where the two sets of switches are shorted by opening and shorting at a speed of, the back current is hard chopped, and soft chopping is performed in each section where one set of switches are shorted and the other set of switches is opened to reduce the noise of the motor. A method of controlling backstage current attenuation comprising generating a zero volt current attenuation that is controlled to minimize. 21. The method of claim 20, wherein generating the operating signal comprises generating a pulse width modulated signal having a pulse width and a frequency that is a function of the operating characteristics of a switched reluctance motor. 22. The method of claim 21, wherein the modulating the set of switches includes reversing a duty cycle of the operation signal when the duty cycle of the pulse width modulation operation signal generated by the signal generating means is a phase different in validity. Post-current attenuation control method. 22. The method of claim 21, wherein detecting the rotor position comprises sensing the hall effect sensor. 21. The method of claim 20, further comprising controlling a signal characteristic of said operating signal with a microprocessor that receives an input signal relating to an operating characteristic of said switched reluctance motor. A method of attenuating a residual current in a winding of a single-phase or multiphase switched reluctance motor in which a current is supplied to a phase winding when the phase is valid and a residual current exists in the phase winding when the phase is ineffective. Switching the windings between a first circuit that is an energy recovery circuit that recovers a portion of the second circuit and a second circuit that is an energy emission circuit that emits a portion of the energy represented by the residual current; In reducing the noise by attenuating the residual current so that the ringing of the switched reluctance motor is minimized by controlling the switching of the winding in a predetermined manner such that the residual current is attenuated to zero between the energy recovery circuit and the energy dissipation circuit. The switching control of the winding may include switching the winding winding to one circuit in a portion of each section in a plurality of sections, and the winding winding to another circuit in the remaining portion of the section, wherein the winding winding is one circuit or Residual current attenuation method comprising the step of varying the duration and duration of each section to be switched to another circuit according to a predetermined method. 27. The method of claim 25, wherein the controlling of the switching of the phase windings between the respective circuits comprises controlling at least one switch used to switch the phase windings according to a pulse width modulation operation signal. The frequency and duty cycle of the modulated signal are varied so that the length of each section where the phase winding is connected to the two circuits and the area of each section where the phase winding is connected to one or the other circuit and the duty cycle of the pulse width modulation signal Current attenuation method that changes either or both. ※ Note: The disclosure is based on the initial application.