KR101699182B1 - Method and system for detecting a reverse electromotive force of time division in sensorless motor - Google Patents

Method and system for detecting a reverse electromotive force of time division in sensorless motor Download PDF

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Publication number
KR101699182B1
KR101699182B1 KR1020150176188A KR20150176188A KR101699182B1 KR 101699182 B1 KR101699182 B1 KR 101699182B1 KR 1020150176188 A KR1020150176188 A KR 1020150176188A KR 20150176188 A KR20150176188 A KR 20150176188A KR 101699182 B1 KR101699182 B1 KR 101699182B1
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South Korea
Prior art keywords
phase
electromotive force
counter electromotive
unit
detection
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KR1020150176188A
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Korean (ko)
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신동영
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주식회사 현대케피코
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/18—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current

Abstract

The present invention provides a system and a method for detecting a counter electromotive force of time division in a sensorless motor, which can detect a counter electromotive force of three phases at every predetermined time using an analog to digital converter (ADC) in a driving circuit of a three-phase (U, V, W phase) BLDC motor. The system for detecting a counter electromotive force of time division in a sensorless motor includes: a power unit for supplying power to the BLDC motor; an inverter unit converting the power supplied from the power unit to a three-phase alternating current power source and applying the three-phase alternating current power source to the BLDC motor; a counter electromotive force detecting unit for detecting the counter electromotive force of each phase induced to a stator coil as a rotor of the BLDC motor rotates; a detection switching unit switching and connecting a connection line of the each phase between the inverter unit and the BLDC motor and the counter electromotive force detecting unit of the each phase of the counter electromotive force detecting unit in order in accordance with a switching control signal for every predetermined time; an AD conversion unit converting an analog (A) counter electromotive force of the each phase, which is detected by the counter electromotive force detecting unit, to a digital (D) signal; and a control unit applying the switching control signal to the detection switching unit and recognizing counter electromotive force data of the each phase which is input by the AD conversion unit in order for the every predetermined time from the counter electromotive force detecting unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sensorless motor time divisional back electromotive force detection system and method,

The present invention relates to a sensorless motor time division demagnetizing power detection system and method and, more particularly, to a sensorless motor time division demagnetization detection system and method for a sensorless motor, Sensorless time divisional back electromotive force detection (DC-DC converter), which detects the three-phase back electromotive force through one ADC (Analog to Digital Converter) by switching each detection switching element and sequentially switching the three detection switching elements at predetermined time intervals. System and method.

Generally, a Brushless Direct Current motor uses a rectifier circuit composed of a switching element instead of a mechanical element such as a brush and a commutator. This brushless DC motor is characterized in that there is no need to replace the brush due to wear, and there is little electromagnetic interference and driving noise.

Brushless DC motors are supplied with power through a power converter that converts commercial AC power to pulsed three-phase AC power. A control device for controlling the speed of a brushless DC motor is characterized in that the rotation of the brushless DC motor based on the phase current information of the three-phase AC power supplied from the power inverter to the brushless DC motor, Control the speed. The control device controls the rotation speed of the brushless DC motor to follow a speed command inputted from the outside.

In order to obtain optimum efficiency from a brushless DC motor, the position of the rotor and the commutation point of the phase current must be precisely matched. To this end, a device for detecting the position of the rotor is required. Generally, a position detection sensor such as an encoder is used for detecting the position of the rotor. Since the encoder is bulky and expensive, a method of detecting the position of the rotor by using an electric circuit has been searched, and as a result, the position of the rotor is detected through the zero crossing point of the motor counter- Electric circuits are widely used.

An operation mode in which the position of the rotor is detected by using an electric circuit instead of a position detection sensor such as an encoder is referred to as a sensorless operation mode. In order to perform the sensorless operation of the brushless DC motor, a predetermined initial start is required before starting the sensorless operation.

A conventional brushless DC motor performs system initialization to initialize the inverter and control variables during sensorless operation, and energizes two of the three phases to forcibly align the rotor. When alignment of the rotor is completed, synchronous acceleration of the motor which increases the phase voltage and the driving frequency to a predetermined value is performed. When the driving frequency and the phase voltage reach a certain level due to the synchronous acceleration, the driving frequency is fixed, the phase voltage is changed, and the operation mode is switched to detect the zero crossing point of the back electromotive force generated at this time. The zero crossing point detected in this process is used to perform the sensorless operation mode of switching the phase current and controlling the rotation speed of the motor.

However, in the sensorless operation system of the conventional brushless DC motor, since three ADCs are used to detect three phases, a circuit for processing the phase value of each phase is increased and the cost is increased.

Korean Registered Patent No. 1251906 (registered on Apr. 02, 2013)

SUMMARY OF THE INVENTION An object of the present invention to solve the above-mentioned problems is to provide a driving circuit for a three-phase (U, V, W phase) BLDC motor in which respective detection switching elements are connected to respective phases (U, V, W) The present invention provides a sensorless time divisional back electromotive force detection system and method for detecting three-phase back electromotive force through one ADC (Analog to Digital Converter) by sequentially switching the detection switching elements at predetermined time intervals.

According to an aspect of the present invention, there is provided a sensorless time divisional back electromotive force detection system comprising: a power supply unit for supplying power to a brushless direct current (BLDC) motor; An inverter unit for converting the power supplied from the power unit into a three-phase AC power source and applying the converted three-phase AC power to the brushless DC motor; A counter electromotive force detecting unit for detecting a counter electromotive force of each phase induced in the stator winding as the rotor of the brushless DC motor rotates; A detection switching unit sequentially switching each phase connection line between the inverter unit and the brushless DC motor and each phase counter electromotive force detection line of the counter electromotive force detection unit according to a switching control signal every predetermined time; An A / D converting unit for converting the analog (A) counter electromotive force of each phase detected through the counter electromotive force detecting unit into a digital (D) signal; And a switching control unit for applying a switching control signal to the detection switching unit so that each of the phase counter electromotive force detection lines and the phase connection lines are sequentially switched and connected at predetermined time intervals, And recognizes the counter electromotive force data of each phase.

The inverter section includes a first switch D1 for applying a high level voltage to the first phase U of the brushless DC motor and a second switch D1 for applying a voltage of a high level A third switch D3 for applying a voltage of a high level to the third phase W and a third switch D2 for applying a voltage of a low level to the first phase U, (L) level voltage is applied to the third phase (W) and a fourth switch (D4) for applying a low level voltage to the second phase (V) And a sixth switch D6.

The detection switching unit may include a first detection switch SW1 for switching connection between the first phase U connection line and the first phase U electromotive force detection line, A second detection switch SW2 switching and connecting the second phase V electromotive force detection line and a third detection switch SW2 switching and connecting the third phase W electromotive force detection line to the third phase W connection line, (SW3).

In addition, the control unit controls the first detection switch (SW1), the second detection switch (SW2), and the third detection switch (SW2) through the detection switching unit in units of 120 degrees in each phase of the sensorless DC motor (SW3), and the counter electromotive force data of each phase inputted through the AD conversion unit sequentially from the back electromotive force detection unit by 120 degrees (º) can be recognized.

The control unit may compare the counter electromotive force data of each phase inputted from the A / D converting unit with the reference voltage data, detect the point where two data coincide with each other as a zero crossing point, and recognize the rotor position of the sensorless DC motor .

According to another aspect of the present invention, there is provided a method of detecting a sensorless motor time-divisional back electromotive force, comprising the steps of: (a) (b) converting the power output from the power source unit in the inverter unit to a three-phase AC power source and applying the converted three-phase AC power to the BLDC motor; (c) applying a switching control signal to the detection switching unit in the control unit; (d) sequentially switching each phase connection line between the inverter section and the BLDC motor and each phase counter electromotive force detection line of the counter electromotive force detection section at predetermined time intervals according to the switching control signal in the detection switching section; (e) detecting a counter electromotive force of each phase induced in the stator winding according to the rotation of the BLDC motor in accordance with the switching connection of the detection switching unit in the counter electromotive force detecting unit; (f) converting an analog (A) counter electromotive force of each phase detected by the AD converter to the digital (D) signal through the counter electromotive force detecting unit; And (g) recognizing the counter electromotive force data of each phase sequentially inputted from the counter electromotive force detecting unit through the AD converting unit at predetermined time intervals in the control unit.

In step (b), the inverter unit may turn on the first switch D1 to apply a voltage of a high level to the first phase U of the brushless DC motor, The switch D2 is turned on to apply a voltage of the H level to the second phase V or to turn on the third switch D3 to turn the H ) Level or a fourth switch D4 is turned on to apply a low level voltage to the first phase U or turn on the fifth switch D5 A voltage of a low level may be applied to the second phase V or a voltage of a low level may be applied to the third phase W by turning on the sixth switch D6.

In the step (d), the detection switching unit switches and connects the first phase (U) connection line and the first phase (U) counter electromotive force detection line through a first detection switch (SW1) Switching connection of the second phase (V) connection line and the second phase (V) counter electromotive force detection line through the switch SW2 or connection of the third phase (W) connection line through the third detection switch (SW3) And the third phase (W) counter electromotive force detection line can be switched and connected.

In the step (d), the control unit controls the first detection switch (SW1) and the second detection switch (SW2) in units of 120 degrees with respect to each phase of the sensorless DC motor ) And the third detection switch (SW3) sequentially, and in the step (g), the counter electromotive force data of each phase inputted through the AD conversion section sequentially in units of 120 degrees (º) from the counter electromotive force detection section have.

In the step (g), the control unit compares the counter electromotive force data of each phase inputted from the A / D converting unit with the reference voltage data, detects a point where two data coincide with a zero crossing point, The rotor position of the DC motor can be recognized.

According to the present invention, it is possible to detect the three-phase counter electromotive force of each of the three detection switching elements through an ADC (Analog to Digital Converter) in a driving circuit of a three-phase (U, V, W phase) BLDC motor.

1 is a block diagram schematically showing the configuration of a sensorless motor time division counter electromotive force detection system according to an embodiment of the present invention.
2 is a diagram illustrating an example of a detailed configuration of an inverter unit and a detection switching unit according to an embodiment of the present invention.
3 is a flowchart illustrating a method of detecting a sensorless motor time-sharing counter electromotive force according to an embodiment of the present invention.
4 is a graph showing counter electromotive force of each phase detected by the counter electromotive force detecting unit according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a block diagram schematically showing the configuration of a sensorless motor time division counter electromotive force detection system according to an embodiment of the present invention.

1, the sensorless motor time-sharing counter electromotive force detection system 100 includes a power supply unit 110, a brushless direct current (BLDC) motor 112, an inverter unit 120, A detection unit 130, a detection switching unit 140, an AD (analog to digital) conversion unit 150, and a control unit 160.

The power supply unit 110 supplies power to the BLDC motor 112. That is, the power supply unit 110 supplies the operating power to the BLDC motor 112 as voltage and current.

The BLDC motor 112 is rotated by receiving power from the power supply unit 110, generates a counter electromotive force during rotation, and increases the magnitude of the counter electromotive force as the rotation speed increases.

The inverter unit 120 converts the power supplied from the power supply unit 110 into three-phase AC power and applies the converted power to the BLDC motor (S112).

The counter electromotive force detecting unit 130 detects the counter electromotive force of each phase (U, V, W) induced in the stator winding as the rotor of the BLDC motor 112 rotates.

The detection switching unit 140 is connected to the phases U, V and W of the inverter unit 120 and the BLDC motor 112 and the phases U, V and W of the counter electromotive force detection unit 130, Are sequentially switched in accordance with the switching control signal every predetermined time.

The A / D converter 150 converts the analog (A) counter electromotive force of each phase detected through the counter electromotive force detector 130 into a digital (D) signal.

The control unit 160 applies a switching control signal to the detection switching unit 140 so that each of the phase counter electromotive force detection lines and the phase connection lines are sequentially switched and connected at predetermined time intervals and then outputs the switching control signal to the detection switching unit 140 sequentially from the counter electromotive force detection unit 130 And recognizes the counter electromotive force data of each phase inputted through the AD conversion unit 150. [

2, the inverter unit 120 includes a first switch D1 for applying a high-level voltage to the first phase U of the BLDC motor 112, A third switch D3 for applying a high level voltage to the third phase W, a second switch D2 for applying a high level voltage to the first phase V, A fifth switch D5 for applying a low level voltage to the second phase V and a fourth switch D5 for applying a voltage of a low level to the third phase W, And a sixth switch D6 for applying a voltage of a low (L) level. 2 is a diagram illustrating an example of a detailed configuration of an inverter unit and a detection switching unit according to an embodiment of the present invention.

2, the detection switching unit 140 includes a first detection switch SW1 for switching connection between the first phase (U) connection line and the first phase (U) counter electromotive force detection line, and a second detection switch A second detection switch SW2 for switching connection between the phase (V) connection line and the second phase (V) counter electromotive force detection line, and a second detection switch SW2 for switching connection between the third phase (W) And a third detection switch SW3.

The control unit 160 controls the first detection switch SW1 and the second detection switch SW2 and the second detection switch SW2 through the detection switching unit 140 in units of 120 degrees in each phase of the BLDC motor 112 3 detection switch SW3 are successively switched and connected so that the counter electromotive force data of each phase inputted through the AD conversion unit 150 sequentially in units of 120 degrees from the counter electromotive force detection unit 130 can be recognized.

The control unit 160 compares the counter electromotive force data of each phase inputted from the A / D conversion unit 150 with the reference voltage data, detects a point at which two data coincide with each other as a zero crossing point, and sets the rotor position of the BLDC motor 112 to Can be recognized.

3 is a flowchart illustrating a method of detecting a sensorless motor time-sharing counter electromotive force according to an embodiment of the present invention.

Referring to FIG. 3, the sensorless time divisional back electromotive force detection system 100 of the present invention outputs power required for the operation of the BLDC motor 112 in the power supply unit 110 (S310).

Next, the inverter 120 converts the power output from the power supply unit 110 into a three-phase AC power and applies it to the BLDC motor 112 (S320).

At this time, the inverter unit 120 turns on the first switch D1 shown in FIG. 2 to apply a high-level voltage to the first phase U of the BLDC motor 112, The second switch D2 is turned on to apply a voltage of the H level to the second phase V or the third switch D3 to turn on the third phase W, A voltage of a low level is applied to the first phase U by applying a voltage of the H level to the first phase U or by turning on the fourth switch D4, The voltage of the low level can be applied to the third phase W by applying the voltage of the low level to the second phase V or by turning on the sixth switch D6 have.

Accordingly, as the rotor of the BLDC motor 112 rotates, a counter electromotive force is output to the winding. The counter electromotive force detector 5 detects the counter electromotive force and applies the counter electromotive force to the controller 160 through the A / D converter 150. In response to the detection of the counter electromotive force, the controller 160 may control the BLDC motor 112 by pulse width modulation so that the BLDC motor 112 operates correctly.

Next, the control unit 160 applies a switching control signal to the detection switching unit 140 (S330). At this time, the switching control signal is a control signal that sequentially turns on each of the detection switches SW1, SW2, SW3 whenever the phase of the BLDC motor 112 is 120 degrees.

Accordingly, the detection switching unit 140 switches between each phase connection line between the inverter unit 120 and the BLDC motor 112 and each phase back electromotive force detection line of the back electromotive force detection unit 130 according to the switching control signal applied from the controller 160. [ (Step S340).

That is, the detection switching unit 140 switches and connects the first phase (U) connection line and the first phase (U) counter electromotive force detection line through the first detection switch (SW1) as shown in FIG. 2, (V) connection line and the second phase (V) counter electromotive force detection line through the second detection switch SW2 or through the third detection switch SW3 to the third phase (W) connection line and the second phase The three-phase (W) counter electromotive force detection line can be switched and connected.

At this time, the controller 160 controls the first detection switch SW1, the second detection switch SW2, and the second detection switch SW2 through the detection switching unit 140 in units of 120 degrees in each phase of the BLDC motor 112 3 detection switch SW3 are successively switched and connected so that the counter electromotive force data of each phase inputted through the AD conversion unit 150 sequentially in units of 120 degrees from the counter electromotive force detection unit 130 is recognized.

Next, the counter electromotive force detecting unit 130 detects the counter electromotive force of each phase induced in the stator winding according to the rotation of the BLDC motor 112 as shown in FIG. 4 according to the switching connection of the detection switching unit 140 (S350). 4 is a graph showing counter electromotive force of each phase detected by the counter electromotive force detecting unit according to the embodiment of the present invention.

Next, the AD converter 150 converts the analog (A) counter electromotive force of each phase detected through the counter electromotive force detector 130 into a digital (D) signal (S360).

Next, the control unit 160 recognizes the back electromotive force data of each phase input from the back electromotive force detection unit 130 through the A / D conversion unit 150 sequentially at predetermined time intervals (S370).

The control unit 160 compares the counter electromotive force data of each phase inputted from the A / D conversion unit 150 with the reference voltage data, detects a point where two data coincide with a zero crossing point, The rotor position of the rotor can be recognized.

Therefore, the sensorless time divisional DC electromotive force detection system 100 according to the present invention can detect the back electromotive force for each phase (U, V, W) of the BLDC motor 112 through one AD converter 150 It is possible to save more money than the prior art that used three AD converters in the prior art.

As described above, according to the present invention, the respective detection switching elements are connected to the respective phases (U, V, W) in the driving circuit of the three-phase (U, V, W phase) BLDC motor, Phase back electromotive force detection system and method capable of detecting the three-phase back electromotive force through one ADC (Analog to Digital Converter) by switching sequentially at predetermined time intervals.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Sensorless motor time division counter electromotive force detection system
110:
112: BLDC motor
120: inverter section
130: a back electromotive force detecting section
140:
140: AD conversion section
150:

Claims (10)

Brushless direct current (BLDC) motors;
A power supply for supplying power to the brushless DC motor;
An inverter unit for converting the power supplied from the power unit into a three-phase AC power source and applying the converted three-phase AC power to the brushless DC motor;
A counter electromotive force detecting unit for detecting a counter electromotive force of each phase induced in the stator winding as the rotor of the brushless DC motor rotates;
A detection switching unit sequentially switching connection of each phase connection line between the inverter unit and the brushless DC motor and each phase counter electromotive force detection line of the counter electromotive force detection unit at regular time intervals according to a switching control signal;
An A / D converting unit for converting the analog (A) counter electromotive force of each phase detected through the counter electromotive force detecting unit into a digital (D) signal; And
A control unit for applying the switching control signal to the detection switching unit and recognizing the counter electromotive force data of each phase sequentially inputted from the counter electromotive force detecting unit through the A /
Lt; / RTI >
Wherein the AD converter comprises a single AD converter,
The detection switching unit may include a first detection switch SW1 for switching connection between the first phase U connection line and the first phase U electromotive force detection line, A second detection switch SW2 for switching connection of the two-phase (V) counter electromotive force detection line and a third detection switch SW3 for switching connection between the third phase (W) connection line and the third phase ),
Wherein the control unit controls the first detection switch (SW1), the second detection switch (SW2), and the third detection switch (SW2) through the detection switching unit in units of 120 degrees in each phase of the brushless DC motor SW3) sequentially recognizes the counter electromotive force data of each phase inputted through the AD conversion unit sequentially in units of 120 degrees from the counter electromotive force detection unit.
The method according to claim 1,
The inverter unit includes a first switch D1 for applying a high level voltage to the first phase U of the brushless DC motor and a second switch D1 for applying a voltage of a high level to the second phase V A third switch D3 for applying a high level voltage to the third phase W and a second switch D2 for applying a voltage of a low level to the first phase U, A fifth switch D5 for applying a voltage of a low level to the second phase V and a sixth switch D5 for applying a voltage of a low level to the third phase W, And a switch (D6).
delete delete The method according to claim 1,
Wherein the control unit includes a sensorless motor for detecting the rotor position of the brushless DC motor by comparing the counter electromotive force data of each phase inputted from the AD conversion unit with the reference voltage data, Time divisional back electromotive force detection system.
(a) outputting power from a power source unit;
(b) converting the power output from the power source unit in the inverter unit to a three-phase AC power source and applying the converted three-phase AC power to the BLDC motor;
(c) applying a switching control signal to the detection switching unit in the control unit;
(d) sequentially switching each phase connection line between the inverter section and the BLDC motor and each phase counter electromotive force detection line of the counter electromotive force detection section at predetermined time intervals according to the switching control signal in the detection switching section;
(e) detecting a counter electromotive force of each phase induced in the stator winding according to the rotation of the BLDC motor in accordance with the switching connection of the detection switching unit in the counter electromotive force detecting unit;
(f) converting an analog (A) counter electromotive force of each phase detected by the AD converter to the digital (D) signal through the counter electromotive force detecting unit; And
(g) recognizing the counter electromotive force data of each phase sequentially inputted from the counter electromotive force detecting unit through the AD converting unit at a predetermined time in the control unit;
Lt; / RTI >
In the step (f), the A / D converter may be composed of a single A / D converter,
In the step (d), the controller may control the first detection switch (SW1), the second detection switch (SW2), and the third detection switch (SW2) in units of 120 degrees in each phase of the BLDC motor through the detection switching unit (SW3), and recognizes the counter electromotive force data of each phase inputted through the A / D conversion unit sequentially from the counter electromotive force detection unit in 120 degrees (?) In the step (g) Way.
The method according to claim 6,
In step (b), the inverter unit applies a high level voltage to the first phase (U) of the BLDC motor by turning on the first switch (D1) A voltage of a high level is applied to the second phase V or a voltage of a high level is applied to the third phase W by turning on the third switch D3, Or the fourth switch D4 is turned on to apply the voltage of the low level to the first phase U or turn on the fifth switch D5 to turn on the second phase Or the voltage of the low (L) level is applied to the third phase (W) by applying the voltage of the low level (L) to the first switch Way.
The method according to claim 6,
In the step (d), the detection switching unit switches or connects the first phase (U) connection line and the first phase (U) counter electromotive force detection line through the first detection switch (SW1) (V) connection line and the second phase (V) counter electromotive force detection line through the switch SW2, or connects the third phase (V) connection line through the third detection switch (SW3) And the third phase (W) counter electromotive force detection line.
delete The method according to claim 6,
In the step (g), the control unit compares the counter electromotive force data of each phase inputted from the A / D conversion unit with the reference voltage data, detects a point at which two data coincide with a zero crossing point, A sensorless motor time division counter electromotive force detection method for recognizing an electronic position.
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