KR100757437B1 - Method for driving 2-phase srm and apparatus therefor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two phase Switched Reluctance Motor (SRM) driving, and more particularly, to a method and apparatus for driving SL using a start sensor used at start-up and a drive sensor used during normal operation. Conventionally, since the first sensor is responsible for starting and normal operation of the first phase and the second sensor is responsible for starting and normal operation of the second phase, torque generation initial stages (for example, t1, t2, In t3), there was a problem in that sufficient current could not be supplied to each phase winding of the SM so that sufficient torque could not be generated. In view of the above problems, the present invention starts two phases based on the detection of the rotor position of the start sensor at start-up, and operates two phases based on the rotor position detection of the driving sensor. By providing the SM drive method and apparatus, there is an effect of generating a sufficient torque during high speed operation.

Description

METHOD FOR DRIVING 2-PHASE SRM AND APPARATUS THEREFOR}

1 is a schematic configuration diagram for detecting a two-phase RM sensor signal.

Figures 2a to 2d is a sensor signal diagram according to the two-phase SM rotor position.

Figure 3 is a SM drive torque curve in accordance with the conventional SM drive method.

4 is an explanatory diagram of an SRM startup according to the present invention.

5 is a schematic diagram illustrating a normal operation of an SM in accordance with the present invention.

6 is a flowchart of a method of driving an SM in accordance with the present invention.

7 is a block diagram of an SM driving device according to the present invention.

** Description of the symbols for the main parts of the drawings **

10: stator 11: rotor

12: rotor shaft 13: shutter

14a, 14b: first and second phase sensors 15: sensor signal generator

S61 to S69: SM drive step of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two phase Switched Reluctance Motor (SRM) driving, and more particularly, to a method and apparatus for driving SL using a start sensor used at start-up and a drive sensor used during normal operation.

In the conventional two-phase SM driving method, the rotor position is detected using two position sensors, and each sensor signal generated according to each of them is responsible for starting and normal operation of each phase.

1 is a schematic configuration diagram for detecting a two-phase SLM sensor signal, as shown in FIG. 1, a quadrupole stator 10, a two-phase rotor 11, and a center of the rotor 11 are connected to each other. Rotor shaft 12 for transmitting the former rotational motion, two-phase shutter 13 rotatable in conjunction with the rotor shaft 12, the first and second phase sensors 14a for detecting the position of the shutter 13 And 14b) and a sensor signal generator 15 for generating first and second phase sensor signals from the detection signals of the first and second phase sensors 14a and 14b.

In FIG. 1, an angle of the shutter area 13 occupies 120 °, and an angle between the angles of the shutter 13 in the open area is 60 °. The first and second sensors 14a, 14b are positioned on the shutter 13 at an angle of 90 °.

According to the conventional SM drive method, when the shutter 13 rotates according to the rotation of the rotor 11, the sensors 14a and 14b detect the position of each phase of the shutter 13, and this is the sensor signal generator 15. ) To generate the first and second phase sensor signals. That is, the first and second phase sensors respectively detect the rotor position of one phase, and use the same to generate first and second phase signals corresponding to the sensor signals in a microprocessor (not shown). LM generates torque by allowing current to be supplied to each phase winding.

2A to 2D are sensor signal diagrams according to the two-phase RM rotor position. As shown in the drawing, when the rotor 11 rotates counterclockwise in the alignment position, the shutter is connected to the rotor shaft 12. (13) also starts to rotate, the first and second phase sensors 14a, 14b detect the position of the shutter 13 by detecting the position of the shutter 13, and by using the sensor signal generator 15 ) Generates sensor signals for each phase.

2A to 2D, the shutter 13 position at the rotor 11 alignment position is 0 degrees. 2A shows a first phase sensor signal S1 that is high when the shutter 13 is located between 0 ° and 30 ° and a second phase sensor signal S2 that is high. 2B shows a first phase sensor signal S1 that is high when the shutter 13 is located between 30 ° and 90 ° and a second phase sensor signal S2 that is low. 2C shows a first phase sensor signal S1 that is high when the shutter 13 is positioned between 90 ° and 120 °, and a second phase sensor signal S2 that is high, and FIG. 2D shows the first phase sensor signal S1 that is low when the shutter 13 is located between 120 ° and 180 ° and the second phase sensor signal S2 that is high. A microprocessor (not shown) generates each phase signal in synchronization with each phase sensor signal, and pulse-modulates each phase signal to drive an SM.

3 is an SM drive torque curve diagram according to a conventional SM drive method, and as shown in FIG. 3, 0 ° in one period (360 °) from the first and second sensor signals shown in FIGS. 2A to 2D. 2-phase SLM winding by pulse width modulating a first phase signal having a dwell time of from 120 ° to 180 ° and a 180 ° to 360 ° and a second phase signal having a delay of 90 ° from the first phase signal. If input to, torque such as the curve of FIG. 3 is generated.

However, in the prior art as described above, since the first sensor is responsible for starting and normal operation of the first phase, and the second sensor is responsible for starting and normal operation of the second phase, torque generation initial stage (e.g., 3 does not supply enough current to each phase winding of SLM to t1, t2, and t3) and thus does not generate sufficient torque.

That is, in the normal operation of driving the SM at high speed, the phase signal must rise at a time earlier than the start so that sufficient torque is generated. However, in the prior art, when the first sensor and the second sensor are started and in normal operation, Since each sensor signal is detected at the same position, each phase signal is generated using the same, and the SM signal is generated, sufficient torque is not generated during high speed operation.

Accordingly, the present invention has been made in view of the above problems, in which two sensors are not responsible for starting one phase and normal operation, but one sensor is responsible for starting both phases and one other. It is an object of the present invention to provide a method and apparatus for driving an SLM in which a sensor is in charge of normal operation of both phases.

In order to achieve the above object, the present invention provides a method for driving two-phase RM by detecting the position of each phase as two sensors, and detecting the position of each phase as a starting sensor among the two sensors. Maneuvering; And detecting the position of each phase as a driving sensor among the two sensors to normally drive the two-phase SLM.
The present invention for achieving the above object,
A start sensor for detecting the position of each phase of the two-phase RM and generating a start sensor signal based on the detection result;
A start sensor for detecting the position of each phase of the two-phase RM and generating a driving sensor signal based on the detection result;
And a microprocessor for controlling the start of the two-phase RM based on the start sensor signal when starting and controlling the operation of the two-phase RM based on the driving sensor signal during normal operation. do.
The present invention for achieving the above object,
As a method of driving the two-phase RM by detecting the position of each phase with a start sensor and a driving sensor,
Detecting a position of each phase with the start sensor and starting a two-phase SM based on the detected position of each phase;
In the normal operation, the operation sensor detects the position of each phase and based on the detected position of each phase is characterized in that to perform a normal operation of the two-phase SM.
In one embodiment of the present invention, the two-phase SM starting step, using the start sensor to detect the position of the rotor to generate a start sensor signal, in synchronization with the start sensor signal to generate a first phase signal Generating a second phase signal having a 90 ° phase difference from the first phase signal; Generating a pulse width modulated (PWM) signal in synchronization with the first phase signal or the second phase signal; And multiplying (AND) the first and second phase signals with the pulse width modulated signal to generate first and second phase start signals.

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In another embodiment of the present invention, the two-phase RM normal operation step, when the rotational speed of the RM or more than a predetermined rotation speed, by detecting the position of the rotor using the driving sensor instead of the starting sensor to operate the driving sensor signal Generating a first phase signal in synchronization with the driving sensor signal, and inverting the first phase signal to generate a second phase signal; Generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; And multiplying the first and second phase signals by the first and second pulse width modulation (PWM) signals to generate first and second phase driving signals.

In addition, the present invention, the start sensor for detecting the position of each phase of the two-phase SLM to generate a start sensor signal; A start sensor for detecting the position of each phase of the two-phase RM and generating a driving sensor signal; And a microprocessor configured to control two-phase RM operation by using the start sensor signal when starting, and to control two-phase RM operation by using the driving sensor signal during normal operation. .

In one embodiment of the present invention, the microprocessor generates a first phase signal and a second phase signal from the starting sensor signal and the driving sensor signal, respectively, and the first phase in synchronization with the starting sensor signal when starting. A signal and a second phase signal are generated, and in operation, the first phase signal and the second phase signal are generated based on the driving sensor signal.

In another embodiment of the present invention, an oscillator for generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; And multiplication means for multiplying (AND) the first and second phase signals and the first and second pulse width modulation (PWM) signals to generate first and second phase driving signals. It features.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is an explanatory diagram of an SRM startup according to the present invention.

As shown therein, the start sensor is placed on the shutter so that the start sensor signal has a dwell time between misalignment and alignment of the first phase inductance profile. Is located in.

A first phase signal is generated in synchronization with the start sensor signal, a second phase signal having a 90 ° phase difference from the first phase signal is generated, and a pulse width is synchronized with the first phase signal or the second phase signal. Generate a modulated (PWM) signal.

The first phase signal and the second phase signal and the pulse width modulated signal are ANDed to generate first and second phase driving signals.

5 is a schematic diagram illustrating a normal operation of an SM in accordance with the present invention.

As shown here, in order to provide sufficient current at the time of torque generation (misalignment of the first phase inductance profile), the driving sensor signal is raised before a misalignment of the first phase inductance profile by a predetermined angle. The driving sensor is located on the shutter. Preferably, the driving sensor signal may be raised 10 ° to 30 ° ahead of the starting sensor signal according to FIG. 4.

A first phase signal is generated in synchronization with the driving sensor signal, and a second phase signal having a 90 ° phase difference from the first phase signal is generated, and a first pulse is generated based on the first phase signal or the second phase signal. A width modulated signal and a second pulse width modulated signal are generated.

In order to increase the variability of the operating speed of the SM, the dwell time of the first and second pulse width modulated signals is variable and may be risen with a predetermined delay time.

6 is a flowchart of a method of driving an SM in accordance with the present invention. As shown in FIG. 6, a first and second phase signals are generated by using a start sensor (S61), in synchronization with the first or second phase signals. Generating a pulse width modulated signal (S62), multiplying the first and second phase signals by a pulse width modulated signal to generate a first and second phase start signal (S63), and a first and second phase start Starting the SLM by using the signal (S64), determining whether the SRM rotation speed is greater than or equal to the predetermined rotation speed after the SLM startup (S65), and when the SLM rotation speed is greater than or equal to the predetermined rotation speed, Generating first and second phase signals using the first and second phase signals (S66), generating first and second pulse width modulated signals in synchronization with the first and second phase signals (S67), and first and second phase signals. The first and second phases by multiplying the signal by the first and second pulse width modulated signals Generating a driving signal (S68), and driving the SLM using the first and second phase driving signal (S69).

FIG. 7 is a block diagram of an SM driving apparatus according to the present invention. As shown in this figure, a starting sensor 71a and a driving sensor 71b for detecting an SM rotor position, the starting sensor 71a and a driving sensor are shown. A microprocessor 72 for generating first and second phase signals from a start sensor signal and a drive sensor signal from 71b, and a pulse width modulated signal from the first and second phase signals from the microprocessor 72; An oscillator 73 to generate and a multiplication means 74 to multiply the first and second phase signals by the pulse width modulation signal to generate an SM driving signal (starting signal and driving signal).

The starting sensor 71a is used at the start, and the driving sensor 71b is used at the normal operation.

The start sensor 71a is positioned such that the start sensor signal is in a dwell state between a misaligned position and an aligned position of a first phase or second phase inductance profile. do. In addition, the driving sensor 71b is positioned such that the driving sensor signal rises ahead of the misalignment position of the first phase or the second phase inductance profile. It may be positioned to rise 10 ° to 30 ° ahead of the start sensor signal.

The oscillator 73 generates a single pulse width modulated signal at start-up, and generates first and second pulse width modulated signals at normal operation, wherein the oscillator 73 generates a single pulse width modulated signal. The dwell time may be changeable according to the driving speed of the SM, and may be risen with a predetermined delay time.

The multiplication means 74 may be implemented in software in the microprocessor 72 or as separate hardware.

As described above, although the embodiments of the present invention have been described in detail with reference to the drawings, the spirit and scope of the present invention should not be construed as being limited to the above embodiments, but are defined by the appended claims. It will be apparent to those skilled in the art that various modifications are possible within the scope of.

As described in detail above, the present invention starts both phases based on the detection of the rotor position of the start sensor when starting, and operates both phases based on the detection of the rotor position of the driving sensor during normal operation. By providing a two-phase SM driving method and apparatus, there is an effect of generating a sufficient torque during high-speed operation.

Claims (22)

As a method of driving a two-phase RM by detecting the position of each phase as two sensors, Detecting a position of each phase as a starting sensor of the two sensors to start a two-phase SLM; And, And detecting the position of each phase as a driving sensor among the two sensors to normally drive the two-phase SLM. The method of claim 1, wherein the two-phase RM activation step, The starting sensor is used to detect the position of the rotor to generate a starting sensor signal, to generate a first phase signal in synchronization with the starting sensor signal, and a second phase signal having a 90 ° phase difference from the first phase signal. Generating a; Generating a pulse width modulated (PWM) signal in synchronization with the first phase signal or the second phase signal; And, And multiplying (AND) the first and second phase signals with the pulse width modulated signal to generate first and second phase start signals. According to claim 1 or 2, wherein the two-phase SRM normal operation step, When the rotation speed of the SM is equal to or greater than a preset rotation speed, the driving position is detected using the driving sensor instead of the starting sensor to generate a driving sensor signal, and a first phase signal is generated in synchronization with the driving sensor signal. Inverting the first phase signal to generate a second phase signal; Generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; And multiplying the first and second phase signals by the first and second pulse width modulation (PWM) signals to generate first and second phase driving signals. . The method according to claim 1 or 2, The starting sensor is positioned such that the starting sensor signal is in a dwell state between a misaligned position and an aligned position of a first or second phase inductance profile. A two-phase RM driving method. The method according to claim 1 or 2, And wherein the driving sensor is positioned so that the driving sensor signal rises ahead of a misalignment position of the first phase or the second phase inductance profile. The method of claim 5, And the driving sensor is positioned such that the driving sensor signal rises 10 ° to 30 ° ahead of the starting sensor signal. A start sensor for detecting a position of each phase of the two-phase RM and generating a start sensor signal;  A start sensor for detecting a position of each phase of the two-phase RM and generating a driving sensor signal; And, Two phases comprising a microprocessor for controlling the two-phase SM operation using the start sensor signal at the start, and the two-phase SM operation using the operation sensor signal at the normal operation SM drive device. The method of claim 7, wherein The microprocessor generates a first phase signal and a second phase signal from the starting sensor signal and the driving sensor signal, respectively, and generates a first phase signal and a second phase signal in synchronization with the starting sensor signal. And generating a first phase signal and a second phase signal based on the driving sensor signal during operation. The method of claim 8, An oscillator for generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; And And multiplying means for multiplying (AND) the first and second phase signals and the first and second pulse width modulation (PWM) signals to generate first and second phase drive signals. 2-phase SM drive device. The method according to claim 7 or 8, The starting sensor is positioned such that the starting sensor signal is in a dwell state between a misaligned position and an aligned position of a first or second phase inductance profile. 2-phase SM drive device. The method according to claim 7 or 8, And wherein the driving sensor is positioned such that the driving sensor signal rises ahead of a misalignment position of the first phase or the second phase inductance profile. The method of claim 11, And the driving sensor is positioned such that the driving sensor signal rises 10 ° to 30 ° ahead of the starting sensor signal. The method of claim 9, The dwell time of the first and the second pulse width modulated signal (Dwell time) can be changed according to the operating speed of the SLM. The method of claim 9, And the first and second pulse width modulated signals are risen with a predetermined delay time. The method of claim 9, The multiplication means is implemented in a software manner or implemented as a separate hardware in the microprocessor. A start sensor for detecting the position of each phase of the two-phase RM and generating a start sensor signal based on the detection result; A start sensor for detecting the position of each phase of the two-phase RM and generating a driving sensor signal based on the detection result; A two-phase SM including a microprocessor that controls the start of the two-phase RM based on the start sensor signal at start-up, and controls the operation of the two-phase RM based on the driving sensor signal at normal operation. drive. The method of claim 1, wherein the microprocessor, After starting, when the rotation speed of the two-phase RM becomes more than the predetermined rotation speed, and enters the normal operation, At start-up, a first phase signal and a second phase signal are generated in synchronization with the starting sensor signal. In operation, the two-phase SM driving device generates a first phase signal and a second phase signal based on the driving sensor signal. The method of claim 16, An oscillator for generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; Multiplication means for multiplying the first and second phase signals by the first and second pulse width modulation (PWM) signals and generating a first phase driving signal and a second phase driving signal based on the result of the multiplication; Two-phase SM drive device comprising a. As a method of driving the two-phase RM by detecting the position of each phase with a start sensor and a driving sensor, Detecting a position of each phase with the start sensor and starting a two-phase SM based on the detected position of each phase; In the normal operation, the driving sensor detects the position of each phase and performs a process of normal operation of the two-phase SM based on the detected position of each phase. 20. The method of claim 19, wherein the step of starting the two-phase RM, Detecting a position of the rotor using the starting sensor and generating a starting sensor signal based on the detection result; Generating a first phase signal in synchronization with the start sensor signal, and generating a second phase signal having a 90 ° phase difference from the first phase signal; Generating a pulse width modulated (PWM) signal in synchronization with the first phase signal or the second phase signal; And multiplying (AND) the first and second phase signals with the pulse width modulated signal to generate first and second phase start signals. 20. The method of claim 19, wherein the normal operation of the two-phase SML, Detecting a rotor position using the driving sensor and generating a driving sensor signal based on the detection result; Generating a first phase signal in synchronization with the driving sensor signal and inverting the first phase signal to generate a second phase signal; Generating first and second pulse width modulation (PWM) signals in synchronization with the first phase signal or the second phase signal; And multiplying the first and second phase signals by the first and second pulse width modulation (PWM) signals to generate first and second phase driving signals. The method of claim 19, After starting, when the rotational speed of the two-phase RM more than the predetermined number of revolutions further comprises the step of entering into normal operation.

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