KR101804464B1 - Control device and method for BLDC motor - Google Patents

Control device and method for BLDC motor Download PDF

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Publication number
KR101804464B1
KR101804464B1 KR1020150187345A KR20150187345A KR101804464B1 KR 101804464 B1 KR101804464 B1 KR 101804464B1 KR 1020150187345 A KR1020150187345 A KR 1020150187345A KR 20150187345 A KR20150187345 A KR 20150187345A KR 101804464 B1 KR101804464 B1 KR 101804464B1
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KR
South Korea
Prior art keywords
bldc motor
rotor
phase
drive
detected
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KR1020150187345A
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Korean (ko)
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KR20170077450A (en
Inventor
김찬
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주식회사 유라코퍼레이션
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Priority to KR1020150187345A priority Critical patent/KR101804464B1/en
Publication of KR20170077450A publication Critical patent/KR20170077450A/en
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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
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The present invention relates to a BLDC motor control apparatus and method, and more particularly, to a BLDC motor control apparatus and a BLDC motor control method, which are capable of switching between a two-phase and three- And more particularly, to a BLDC motor control apparatus and method thereof.
Further, the present invention provides a motor control apparatus comprising a rotor position detector for detecting a state of a BLDC motor and a position of a rotor using current information and position information of the BLDC motor, and determining whether to drive the BLDC motor in two- A drive control unit for switching the drive mode of the BLDC motor to two-phase or three-phase according to a result detected or determined by the rotor position detection unit and controlling the motor drive unit according to the switched drive mode, The BLDC motor can be switched to a two-phase or three-phase motor in accordance with various conditions detected by the rotor position detecting unit, since the motor driving unit supplies the supplied power to the BLDC motor.

Description

[0001] The present invention relates to a BLDC motor control device,

The present invention relates to a BLDC motor control apparatus and method, and more particularly, to a BLDC motor control apparatus and a BLDC motor control apparatus, which are capable of switching between a two-phase and three- And more particularly, to a BLDC motor control apparatus and method thereof.

In general, BLDC (Brushless DC) motors have advantages of less noise, longer life, and higher precision than general DC motors, and are widely used in various industrial fields.

The conventional BLDC motor can be controlled by a two-phase excitation method and a three-phase excitation method (SVPWM, Space Vector PWM), and the control is relatively simple in the case of driving a BLDC motor in a two- However, a torque ripple may occur because the same force is not always applied to all the rotation sections.

On the other hand, if the BLDC motor is driven by the three-phase excitation method, the same output torque can be generated in all the rotation sections, but the current consumption is higher than that of the two-phase excitation method and a relatively complicated control process is required. Particularly, in the case of the three-phase excitation method, since the position of the rotor of the BLDC motor must be accurately detected, the position of the rotor is detected using a Hall sensor, an encoder, or a back electromotive force.

On the other hand, the control of the three-phase excitation system is widely used in the conventional BLDC motor, but in this case, there is a problem that an initial driving period for detecting the rotor position of the BLDC motor is required.

For example, in order to control the conventional BLDC motor in a three-phase excitation mode, an initial driving period is required for determining the position of the rotor by idly rotating the BLDC motor with an arbitrary input whenever the BLDC motor is driven. The accuracy of the BLDC motor may be reduced and heat generation and overcurrent may be generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a BLDC motor control apparatus capable of driving a BLDC motor by switching to two-phase or three- .

It is another object of the present invention to provide a BLDC motor control apparatus capable of driving a BLDC motor without a separate initial driving period and a method thereof.

Another object of the present invention is to provide a BLDC motor control apparatus and method which can accurately detect the position of a rotor by switching the control method of the BLDC motor when the position of the rotor is unclear during driving of the BLDC motor .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a BLDC motor control apparatus for controlling a BLDC motor having a hall sensor and an encoder, the BLDC motor control apparatus comprising: A rotor position detection unit for detecting the state of the BLDC motor and the position of the rotor and determining whether to drive the BLDC motor in two-phase or three-phase; A drive control unit for switching the drive mode of the BLDC motor to two-phase or three-phase according to a result detected or determined by the rotor position detection unit and controlling the motor drive unit according to the switched drive mode; And a motor driving unit for switching the power supplied from the outside and supplying the power to the BLDC motor under the control of the drive control unit.

In a preferred embodiment, the rotor position detection unit detects a rotor position error of the BLDC motor based on the current information, and when the rotor position error occurs, the drive control unit sets the driving method of the BLDC motor to two-phase Switch.

In a preferred embodiment, the rotor position detection unit detects the position of the rotor using the position information output from the hall sensor and the encoder while the BLDC motor is driven in two phases, and the drive control unit detects the position The driving method of the BLDC motor is switched to the three-phase.

In a preferred embodiment, the rotor position detection unit causes the drive control unit to drive the BLDC motor in the two-phase drive mode when the BLDC motor is initially driven.

Further, the present invention is a BLDC motor control method performed in a BLDC motor control apparatus, comprising the steps of: (1) driving the BLDC motor in a two-phase driving mode when the BLDC motor control apparatus is initially driven; (2) The BLDC motor control device detects the position of the rotor using the position information output from the hall sensor and the encoder of the BLDC motor while the BLDC motor is driven in two phases; And (3) the BLDC motor control device switches the driving mode of the BLDC motor to the three-phase when the position of the rotor is detected.

In a preferred embodiment, after the step (3), (4) the BLDC motor control apparatus detects a rotor position error of the BLDC motor based on the current information input to or output from the BLDC motor, And switching the driving method of the BLDC motor to two-phase when a position error is detected.

In a preferred embodiment, after the step (4), (5) the BLDC motor control apparatus continuously drives the BLDC motor in a three-phase driving mode when a rotor position error of the BLDC motor is not detected; .

In a preferred embodiment, in the step (2), the BLDC motor control apparatus includes: (2-1) securing a reference position of the Hall sensor using position information of the encoder; (2-2) comparing the electric angle when the reference position of the hall sensor is secured, and judging whether or not it is within an error range; And (2-3) detecting the position of the rotor at the reference position when the electrical angle of the hall sensor is within an error range.

According to the above-mentioned problem solving means, the present invention detects the state of the BLDC motor and the position of the rotor by using the current information and the position information of the BLDC motor, and judges whether to drive the BLDC motor in two- A drive control unit for switching the drive mode of the BLDC motor to two-phase or three-phase according to a result detected or determined by the rotor position detection unit and controlling the motor drive unit according to the switched drive mode, The BLDC motor is switched to the two-phase or three-phase in accordance with various conditions detected by the rotor position detector during the driving of the BLDC motor, There is an effect that can be done.

In addition, the present invention can drive a BLDC motor without a separate initial driving period according to the three-phase driving method by driving the BLDC motor in the two-phase driving method at the time of the initial driving.

Further, according to the present invention, when a rotor position error occurs during driving of the BLDC motor, the position of the rotor can be accurately detected by switching to the two-phase driving system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a BLDC motor control apparatus according to an embodiment of the present invention; FIG.
2 is a view for explaining a BLDC motor control method according to an embodiment of the present invention;
3 is a diagram for explaining a process of detecting a rotor position according to a BLDC motor control method;

It should be understood that the specific details of the invention are set forth in the following description to provide a more thorough understanding of the present invention and that the present invention may be readily practiced without these specific details, It will be clear to those who have knowledge.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG.

1 is a view for explaining a BLDC motor control apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a BLDC motor control apparatus according to an embodiment of the present invention includes a rotor position detector 110, a drive controller 120, and a motor driver 130.

Here, the BLDC motor control apparatus according to an embodiment of the present invention may be for controlling a BLDC motor 10 having a Hall sensor and an encoder. In the above-described hall sensor and encoder, positional information on the BLDC motor 10 can be output.

The rotor position detection unit 110 detects the state of the BLDC motor 10 and the position of the rotor and detects the rotor position of the BLDC motor 10 using the position information output from the hall sensor and the encoder .

The rotor position detection unit 110 detects the rotor position error of the BLDC motor 10 using the current information inputted to or outputted from the BLDC motor 10 to determine whether the state of the BLDC motor 10 is normal And it may be determined whether to drive the BLDC motor 10 in two-phase or three-phase depending on the state of the BLDC motor 10. [

At this time, the rotor position detection unit 110 measures current information from three phases (e.g., U, V, and W) of the BLDC motor 10 and compares the measured current balances of the three phases, Can be determined. For this purpose, the rotor position detection unit 110 may include a wire electrically connected to the BLDC motor 10 or may include a current sensor to receive current information.

The rotor position detection unit 110 detects a result of detecting the position of the rotor and a result of determining whether to drive the BLDC motor 10 in two or three phases to a drive control unit 120 Thereby enabling the drive control unit 120 to switch the drive mode of the BLDC motor 10. [

The BLDC motor 10 may be driven by a two-phase driving method when the BLDC motor 10 is driven for the first time, and the BLDC motor 10 may be driven by a two- And the position of the rotor is detected by receiving the position information from the Hall sensor and the encoder. When the position of the rotor is detected, the BLDC motor 10 is switched to the three-phase driving system through the driving control unit 120 .

While the BLDC motor 10 is driven in the three-phase driving mode, the rotor position detection unit 110 detects the rotor position error using the current information of the BLDC motor 10, And when it is detected, the BLDC motor 10 is switched to the two-phase driving system through the driving control unit 120, and then the position of the rotor is detected again.

That is, the rotor position detection unit 110 can detect the position of the rotor by switching to the two-phase driving system every time the position of the rotor is unclear during the driving of the BLDC motor 10.

The rotor position detector 110 may be an MCU and may output a PWM control signal to the drive controller 120 to drive the BLDC motor 10 in two or three phases.

The drive control unit 120 is for controlling the motor driving unit 130. The drive control unit 120 switches the driving method of the BLDC motor 10 to two-phase or three-phase in accordance with a result detected or determined by the rotor position detection unit 110 And controls the motor driving unit 130 according to the switched driving method.

Preferably, the drive control unit 120 drives the BLDC motor 10 in a two-phase drive mode when the BLDC motor 10 is initially driven, and controls the driving method of the BLDC motor 10 even when a rotor position error occurs And when the position of the rotor is detected by the rotor position detecting unit 110, the driving method of the BLDC motor 10 may be switched to the three-phase driving mode.

In addition, the drive controller 120 may be implemented as a field programmable gate array (FPGA).

The drive control unit 120 may also transmit the PWM control signal input from the rotor position detection unit 110 to each switch of the motor driving unit 130 to be described later.

The motor driving unit 130 switches the power supplied from the outside and supplies it to the BLDC motor 10. The motor driving unit 130 may be a three-phase full-bridge inverter.

Under the control of the drive control unit 120, the motor driving unit 130 supplies power to each phase of the BLDC motor 10 by switching operation of the plurality of FETs, Or three phases.

Accordingly, the BLDC motor control apparatus according to an embodiment of the present invention can control the BLDC motor 10 to be a two-phase or three-phase (three-phase) motor according to a result detected or determined by the rotor position detection unit 110 when the BLDC motor 10 is driven. And the BLDC motor 10 can be driven for the first time by the two-phase driving method, so that no separate initial driving period is required. When the rotor position error occurs during driving of the BLDC motor 10, And the position of the rotor can be accurately detected by switching to the phase drive system.

FIG. 2 is a view for explaining a BLDC motor control method according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining a process of detecting a rotor position according to a BLDC motor control method.

Referring to FIG. 2 and FIG. 3, a BLDC motor control method performed in the BLDC motor control apparatus according to an embodiment of the present invention will be described.

However, since the functions performed in the BLDC motor control method shown in FIGS. 2 and 3 are all performed in the BLDC motor control apparatus described with reference to FIG. 1, all functions described with reference to FIG. It should be noted that all functions performed in the BLDC motor control method according to the preferred embodiment of the present invention and described with reference to FIGS. 2 and 3 are performed in the BLDC motor control apparatus according to the preferred embodiment of the present invention.

First, when the BLDC motor is initially driven, the drive control unit drives the BLDC motor in a two-phase drive system (S110).

At this time, the drive control unit controls the motor driving unit so that the motor driving unit switches the power supplied from the outside to drive the BLDC motor in a two-phase driving manner.

Next, the rotor position detection unit detects the position of the rotor using the position information output from the hall sensor and the encoder of the BLDC motor while the BLDC motor is driven in two phases (S120).

At this time, the rotor position detection unit repeats the process of securing the reference position of each of the Hall sensors using the Z pulse from among the A, B and Z pulses outputted from the encoder, for example, the position information of the encoder (S121) When all the reference positions of the sensors are secured, it is determined whether or not the electric angle is within the error range (S122). If the electric angle of the Hall sensor is within the error range, (S123).

However, if the electrical angle of the hall sensor is out of the tolerance range in step 123, the operation is repeated from step 121 and repeatedly performed until the rotor position of the BLDC motor is detected.

Then, when the position of the rotor is detected from the rotor position detection unit, the drive control unit switches the drive mode of the BLDC motor to the three-phase (S130).

At this time, the drive control unit controls the motor driving unit to switch the BLDC motor to the three-phase driving mode, and the power is inputted to the three phases of the BLDC motor by the switching operation of the motor driving unit.

Next, the rotor position detection unit detects whether a rotor position error of the BLDC motor is generated based on the current information input or output to the BLDC motor (S140).

In this case, when the rotor position error is detected from the rotor position detection unit, the operation of the BLDC motor is switched to two-phase by performing the above-described operation 120, and the rotor position detection unit detects the rotor Lt; / RTI >

However, when the rotor position error of the BLDC motor is not detected from the rotor position detection unit, the BLDC motor can be continuously driven by the three-phase driving method (S150).

At this time, while the BLDC motor is driven by the three-phase driving method, the rotor position detecting unit repeats the operation of detecting the rotor position error according to the above-described step 140 at a constant cycle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

110: Rotor position detector
120:
130:

Claims (8)

A BLDC motor control device for controlling a BLDC motor having a hall sensor and an encoder,
The state of the BLDC motor and the position of the rotor are detected by using the current information inputted or outputted by the BLDC motor and the position information outputted from the hall sensor and the encoder and it is judged whether or not the BLDC motor is driven in two or three phases A rotor position detector for detecting a rotor position;
A drive control unit for switching the drive mode of the BLDC motor to two-phase or three-phase according to a result detected or determined by the rotor position detection unit and controlling the motor drive unit according to the switched drive mode; And
And a motor driving unit for switching the power supplied from the outside under the control of the drive control unit and supplying the power to the BLDC motor,
Wherein the rotor position detection unit comprises:
When the BLDC motor is driven in two phases, the position of the rotor is detected by using the position information outputted from the hall sensor and the encoder, and while the BLDC motor is driven in three phases, the rotor position error is detected In addition,
The drive control unit may include:
When the position of the rotor is detected by the rotor position detecting unit, the driving method of the BLDC motor is switched to the three-phase when the rotor position error is detected by the rotor position detecting unit, Transition,
The BLDC motor control device includes:
And the position of the rotor is detected by switching to the two-phase drive system whenever a rotor position error is detected during driving of the BLDC motor.
delete delete The method according to claim 1,
Wherein the rotor position detection unit causes the drive control unit to drive the BLDC motor by a two-phase drive method when the BLDC motor is initially driven.
A BLDC motor control method performed in a BLDC motor control apparatus,
(1) The BLDC motor control device drives a BLDC motor in a two-phase driving mode at the time of initial driving;
(2) The BLDC motor control device detects the position of the rotor using the position information output from the hall sensor and the encoder of the BLDC motor while the BLDC motor is driven in two phases;
(3) When the position of the rotor is detected, the BLDC motor controller switches the drive mode of the BLDC motor to three-phase; And
(4) The BLDC motor control device detects the rotor position error of the BLDC motor based on the current information input to or output from the BLDC motor, and when the rotor position error is detected, Comprising:
In the step (2), the BLDC motor control apparatus includes:
(2-1) securing a reference position of the hall sensor using the position information of the encoder;
(2-2) comparing the electric angle when the reference position of the hall sensor is secured, and judging whether or not it is within an error range; And
(2-3) detecting the position of the rotor at the reference position when the electrical angle of the hall sensor is within an error range,
The BLDC motor control device includes:
Wherein the control unit switches the two-phase drive system whenever a rotor position error is detected during driving of the BLDC motor, and detects the position of the rotor in accordance with the step (2).
delete 6. The method of claim 5,
After the step (4)
(5) The BLDC motor control apparatus further comprises a step of continuously driving the BLDC motor in a three-phase driving mode when a rotor position error of the BLDC motor is not detected. delete
KR1020150187345A 2015-12-28 2015-12-28 Control device and method for BLDC motor KR101804464B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150187345A KR101804464B1 (en) 2015-12-28 2015-12-28 Control device and method for BLDC motor

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Application Number Priority Date Filing Date Title
KR1020150187345A KR101804464B1 (en) 2015-12-28 2015-12-28 Control device and method for BLDC motor

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KR20170077450A KR20170077450A (en) 2017-07-06
KR101804464B1 true KR101804464B1 (en) 2017-12-04

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