KR101664693B1 - Logic Controller of Brushless DC Motor and the method of control for driving part of Brushless DC Motor using the same - Google Patents

Abstract

The present invention relates to a brushless direct current motor having a brushless direct current motor capable of improving the responsiveness and ease of maintenance by performing the control for driving the brushless DC motor by the logic gate and simplifying the system, Controller and a method of controlling a brushless DC motor using the same.

Description

Technical Field [0001] The present invention relates to a logic controller of a brushless DC motor and a method of controlling the driving unit of the brushless DC motor using the same,

One embodiment of the present invention relates to a logic controller of a brushless direct current (BLDC) motor and a method of controlling a driving unit of a brushless DC motor using the same.

Generally, a brushless DC (BLDC) motor is a brushless DC motor that eliminates the brush and commutator of the DC motor and is equipped with an electronic rectifier. The brushless DC motor has a permanent magnet And the current is applied to the winding of the stator according to the electronic position to generate the magnetic flux, thereby rotating the rotor. Accordingly, the speed of the rotor in the motor can be controlled, and mechanical noise caused by the friction between the brush and the commutator of the conventional DC motor as well as electrical noise is not generated. In order to realize such a function, it is essential to grasp the position of the rotor, that is, the permanent magnet.

Normally, the position of the permanent magnet is detected by using a magnetic flux detecting sensor such as a Hall sensor. Each of the three hall sensors is disposed at an interval of 120 degrees electrically around the rotor to detect the position of the rotor. An operation section required for continuous rotation of the rotor is determined through the position information of the rotor detected by the Hall sensor, and thus, two phases to which a current is to be supplied are selected, . During operation of such a brushless DC motor, only two phases of the three-phase windings are excited at all times, and the remaining phases of the three phases are not excited and are floating.

To drive a brushless DC motor, U, V, and W phases should be controlled according to the signal status of the Hall sensor. In order to satisfy the output relation to the inverter according to the Hall sensor input in the brushless DC motor, a program is mainly embedded in a device such as a DSP (Digital Signal Processor) or an MCU (Micro Controller Unit) To add various functions to the driver of the brushless DC motor for use by many users.

A brushless DC motor using a DSP or an MCU performs various functions using a general-purpose DSP or an MCU, so that the structure of the brushless DC motor system becomes complicated, making it difficult to maintain the brushless DC motor system Is weighted. In addition, since the DSP or MCU performs not only the driving control of the brushless DC motor but also various other functions, the internal operation process is delayed and the driving control processing speed of the brushless DC motor is delayed. In order to process various functions at a high speed, it is necessary to use an expensive DSP or MCU with better performance, which increases the manufacturing cost of the brushless DC motor system.

A main object of the present invention is to provide a logic controller of a brushless DC motor capable of performing direction control, speed control and on / off function of a driving unit of a brushless DC motor, and a control method of a driving unit of a brushless DC motor using the same .

Another object of the present invention is to provide a logic controller of a brushless DC motor which can simplify the system, exhibit quick response and thus can be easily maintained, and can reduce the cost of implementing a brushless DC motor system, and And to provide a method of controlling a driving part of a brushless DC motor using the brushless DC motor.

In a logic controller that controls a driving unit of a brushless DC motor and includes a signal generator according to an embodiment of the present invention, the position of the rotor positioned inside the brushless DC motor is detected, An inversion circuit for receiving the first phase signal and inverting the first phase signal to output an inverse phase signal; a second inversion circuit for inverting the first phase signal or the inverse phase signal, A multiplexer for selecting one of the first phase signal and the inverted phase signal to output a selected signal, and a controller for controlling operation of the driving unit according to a pulse signal and an operation signal, which are connected to an output terminal of the multiplexer, Wherein the pulse signal and the operation signal are signals for operating the driving unit A demultiplexer that receives the selected signal output from the multiplexer and outputs a second phase signal, and a logic circuit unit that receives the second phase signal from the demultiplexer and performs a logical operation to output an phase output signal, have.

Wherein the multiplexer determines the direction of rotation of the rotor according to a normal signal input from the signal generator and determines the rotational speed of the rotor in accordance with the pulse signal input from the signal generator to the demultiplexer, And the operation of the driving unit may be determined according to the second phase signal outputted from the demultiplexer by receiving the selected signal outputted from the multiplexer.

In the present invention, the multiplexer may determine the direction of rotation of the rotor by selecting either the first phase signal or the inverse phase signal according to the normal / reverse signal input from the signal generator.

In the present invention, the multiplexer may select the inversion phase signal when the value of the normal / reverse signal is present, and may determine the direction of rotation of the rotor by selecting the first phase signal if there is no value of the normal / .

In the present invention, the multiplexer may be a quad 2 input multiplexer.

The demultiplexer may output the value of the second phase signal regardless of the value of the selected signal input from the multiplexer when there is no value of the pulse signal or when the value of the operation signal is present have.

In the present invention, the demultiplexer may comprise a 3-8 demultiplexer, and the second phase signal may be a plurality of signals output from a plurality of output terminals of the 3-8 demultiplexer.

In the present invention, the logic circuit unit may include six NAND gates, each of the NAND gates performing a NAND operation on any two of the plurality of signals output from the demultiplexer, thereby outputting the phase output signal can do.

The demultiplexer may output the value of the second phase signal when the value of the pulse signal is absent or the value of the operation signal is present, The value of the phase output signal is not outputted by the NAND operation, so that the rotor can be prevented from rotating.

In the present invention, the detection sensor may be composed of three Hall sensors.

In the present invention, the inverting circuit may further include: an inverter for receiving the first phase signal and inverting the first phase signal to output the inverted phase signal; and a non-inverting non- And may include an inverting terminal.

A method of controlling a driving unit of a brushless DC motor using a logic controller including a signal generator, a plurality of detection sensors, an inversion circuit unit, a multiplexer, a demultiplexer, and a logic circuit unit according to an embodiment of the present invention, Detecting a position information of a rotor positioned inside a brushless DC motor and outputting a first phase signal corresponding to position information of the rotor, inverting the first phase signal to generate an inverted phase signal The multiplexer receives the normal and inverted signals from the signal generator and receives the first and second inverted phase signals to select one of the first and second inverted phase signals to output the selected signal The demultiplexer receives a pulse signal and an operation signal from the signal generator Wherein the demultiplexer outputs a second phase signal in accordance with the selected signal output from the multiplexer when the demultiplexer determines that the driving unit is operated, And outputting the phase output signal by performing a logic operation upon receiving the second phase signal.

In the present invention, the position information may be determined in advance according to the polarity of the permanent magnet constituting the rotor.

In the present invention, the multiplexer selects and outputs the first phase signal when there is no value of the normal / reverse signal, and when the value of the normal / reverse signal is present, the multiplexer selects and outputs the inverted phase signal have.

In the present invention, when there is no value of the pulse signal or a value of the operation signal, the demultiplexer can output the value of the second phase signal irrespective of the value of the selected signal selected in the multiplexer .

In the present invention, the phase output signal output from the logic circuit may be input to a driving unit of the brushless DC motor through an inverter to drive the driving unit.

According to an embodiment of the present invention, the logic controller for driving the brushless DC motor only takes charge of the motor control, so that the responsiveness and the ease of maintenance can be improved, the system can be simplified, have.

1 is a circuit diagram schematically showing a driving logic controller of a brushless DC motor according to an embodiment of the present invention.
2 is a graph illustrating an output of a detection sensor of a logic controller according to an exemplary embodiment of the present invention and an input of a driving unit according to the output of the detection sensor.
3 is a diagram schematically illustrating the configuration of a brushless DC motor using a logic controller according to an embodiment of the present invention.
4 is a flowchart illustrating a method of controlling a driving unit of a brushless DC motor using a logic controller according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

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

1 is a circuit diagram schematically showing a driving logic controller 100 of a brushless DC motor according to an embodiment of the present invention.

1, a logic controller 100 of a brushless DC motor according to an exemplary embodiment of the present invention includes a detection sensor 110, an inversion circuit 120, a multiplexer 130, a demultiplexer 140, a logic circuit 150, a power supply unit 160, and a signal generator 170.

The detection sensor 110 may detect the position of the rotor positioned inside the brushless DC motor and output a first phase signal corresponding to the position of the rotor. The detection sensor 110 may be composed of, for example, three Hall sensors. The hall sensor has a hall effect in which an electromotive force is generated in a direction perpendicular to both the direction of the current and the direction of the magnetic field when a magnetic field is applied to a conductor through which the current flows, ). The hall sensor senses the direction of the electromotive force by using the hall effect, and can grasp the position of the rotor, thereby detecting predetermined position information in the rotor.

Specifically, each of the three hall sensors outputs a first phase signal having a signal value of 1 or 0 according to the polarity (N pole or S pole) of the permanent magnet constituting the rotor of the brushless DC motor adjacent thereto, The phase output signal input to the brushless DC motor driving unit may be switched according to the value of the first phase signal.

Accordingly, the permanent magnet rotates according to a value at which the phase output signal input to the driving unit of the brushless DC motor changes. In this case, the first phase signals output from the three hall sensors do not take into consideration the case where the output values are all 1 or all 0s.

As described above, the rotor of the brushless DC motor has position information previously determined according to the polarity of the permanent magnet constituting the rotor, and the detection sensor 110 detects the position of the Hall sensor and the permanent magnet The position information of the permanent magnet can be detected by the Hall effect generated by the Hall effect and the first phase signal can be output.

Hall sensor Phase output Prize
(Phase)
C

B

A

U +

U-

V +

V-

W +

W-
One One One 0 One 0 0 0 0 One 2 One 0 0 0 0 One 0 0 One 3 One 0 One 0 One One 0 0 0 4 0 0 One 0 One 0 0 One 0 5 0 One One 0 0 0 One One 0 6 0 One 0 One 0 0 One 0 0

Hall sensor

Phase output
Prize
(Phase)
C
B
A
U +
U-
V +
V-
W +
W- One One 0 One One 0 0 One 0 0 2 One 0 0 0 0 0 One One 0 3 One One 0 0 One 0 0 One 0 4 0 One 0 0 One One 0 0 0 5 0 One One 0 0 One 0 0 One 6 0 0 One One 0 0 0 0 One

Table 1 shows a CW (clockwise) phase output that is finally input to the driving unit of the brushless DC motor according to the first phase signal and the first phase signal output from the hall sensor according to the position of the permanent magnet (CCW), which is input to the driving unit of the brushless DC motor according to the first phase signal and the first phase signal output from the Hall sensor according to the position of the permanent magnet, ) Phase output.

In Table 1 and Table 2, Phase is a type of the position of the rotor detected by the detection sensor 110. For example, if the rotor, which is a permanent magnet, consists of one N and S poles and the stator has six windings, the position of the rotor can be divided into six sections, 2, and can be measured by the detection sensor 110. [0033] FIG.

In the Tables 1 and 2, the Hall sensors A, B and C are three Hall sensors constituting the detection sensor 110, and the values indicated by A, B and C represent the positions of the rotors detected by the three Hall sensors Is a first phase signal. For example, each of the Hall sensors A, B and C can output 1 when detecting the N pole of the rotor and 0 when detecting the S pole. In Table 1, the Hall sensors A, B, and C represent values 0, 1, and 1 in Table 1, because Hall sensor A detects the S pole of the rotor and outputs 0, And the Hall sensor C detects the N pole of the rotor and outputs 1 by detecting the N pole of the rotor.

The phase outputs (U +, U-, V +, V-, W +, and W-) in Tables 1 and 2 correspond to the inversion circuit portion 120, the multiplexer 130, (140), and a logic circuit unit (150). The phase output signal is input to the driving unit of the brushless DC motor. This will be described later.

The input terminal of the inversion circuit unit 120 may be connected to the detection sensor 110 and the output terminal thereof may be connected to the multiplexer 130. The inversion circuit unit 120 receives the first phase signal output from the detection sensor 110, inverts the first phase signal, and outputs the inverted phase signal without inverting the received first phase signal. That is, the inversion circuit unit 130 can output one first phase signal input from the detection sensor 110 as an inverted phase signal and a first phase signal, which are two signals, and the inverted phase signal outputted from the inversion circuit unit 130 The signal and the first phase signal may be input to the multiplexer 140.

The inversion circuit part 120 may be composed of an inverter 121 and a non-inverting terminal 122 as an example. The inverter 121 receives the first phase signal output from the detection sensor 110, inverts the first phase signal, and outputs the inverted phase signal. As an example, the inverter 121 may be a Not-Gate.

When the first phase signal output from the detection sensor 110 is 1, the inverter 121 inverts the first phase signal to output an inverted phase signal having a signal value of 0, If the phase signal is 0, it can be inverted to output an inverted phase signal having a signal value of 1.

The inversion circuit part 120 is connected to the detection sensor 110 composed of three Hall sensors, so that it can be composed of three inverters 121 for processing the first phase signal output from the three hall sensors.

The non-inverting terminal 122 is connected to the output terminals 111, 112 and 113 of the detection sensor 110 and outputs the first phase signal as it is without inverting it to the input terminal 131 of the multiplexer 130 . That is, when the first phase signal outputted from the detection sensor 110 is 1, the non-inverting terminal 122 can receive the first phase signal and output it as a first phase signal having a signal value of 1, And outputs the first phase signal having the signal value of 1 when the first phase signal is '0'.

The inversion circuit unit 120 controls the logic controller 100 of the brushless DC motor to output the same phase output when the positions of the rotors are inverted from each other in the clockwise control and the counterclockwise control of the rotor You can control it. This will be described later.

The output values of the hall sensors A, B and C are in the inverted state, but the phase output at this time is 1, 0, 0, 0, 0, and 1, respectively. In the inverted state, output values of the Hall sensors A, B, and C are inverted from each other as output values of Hall sensors A, B, and C in Tables 1 and 2. This inversion state indicates a case where the position information of the rotor detected by the detection sensor 110 is opposite to each other. As described above, the inversion circuit unit 120 controls the logic controller 100 of the brushless DC motor to output the same phase output as shown in Table 1 and Table 2 when the rotor rotates in the normal direction or the reverse direction can do.

The multiplexer 130 has its inputs 131 and 132 connected to the inverting circuit 120 to receive the first phase signal or the inverted phase signal and the signal generator 170 and the selection input 133 are connected Either one of the first phase signal and the inverse phase signal may be selected and inputted to the input terminals 141 to 143 of the demultiplexer 140 according to the normal and reverse signals inputted from the signal generator 170. Specifically, when the value of the normal / reverse signal received from the signal generator 170 is 0 (for example, the value of the normal / inactive signal is zero or the value of the normal / inactive signal is 0 V) The multiplexer 130 selects and outputs the first phase signal and the output first phase signal may be input to the input terminals 141 to 143 of the demultiplexer 140. [ When the value of the normal / reverse signal 171 is 1 (for example, the value of the normal / reverse signal is greater than 0V), the multiplexer 130 selects the inverted phase signal And the output inverted phase signal may be input to the input terminals 141 to 143 of the demultiplexer 140.

The multiplexer 130 selects one of the first phase signal and the inverse phase signal received from the inversion circuit unit 120 according to the value of the normal signal input from the signal generator 170 and outputs the selected signal to the demultiplexer 140 The driving direction of the brushless DC motor can be determined in the forward direction or the backward direction according to the position information of the rotor detected by the detection sensor 110. [ This will be described later.

The multiplexer 130 may be, for example, a quad 2-input multiplexer or a 74LS157 multiplexer as a specific example.

Operation / non-operation


Optional input
input


Print
The first phase signal

Inverted phase signal
One

X
X
X
0
0

One
X
0
0
0

One
X
One
One
0

0
0
X
0
0

0
One
X
One

Table 3 is a truth table of the 74LS157 multiplexer that may be used as the multiplexer 130 of the logic controller according to an embodiment of the present invention.

The operation / non-operation of Table 3 is a ground signal (Ground, GND) inputted to the operation terminal 134 of the multiplexer 130 and the selection input Select is selected from the normal terminal 171 of the signal generator 170, The first phase signal of the "input" is a signal input from the detection sensor 110 to the multiplexer 130, and the inverted phase signal is a signal input to the selection terminal 133 of the first input / And is input to the multiplexer 130 from the inversion circuit unit 120. And "output" represents a selected one of the first phase signal and the inverted phase signal.

Referring to Table 3, when the value of the operation / non-operation being the ground signal is 1 (when the operation / non-operation signal is present or when the operation / non-operation signal is greater than 0 V) The output value can be output as 0 regardless of the value of the selection input, the value of the first phase signal, and the value of the inversion phase signal. When the value of the ground signal is 1, the multiplexer 130 always transmits an output having a value of 0 to the demultiplexer 140. In this case, the value of the phase output signal outputted through the logic circuit unit 150 via the demultiplexer 140 becomes 0, which makes it impossible to operate the driving unit of the brushless DC motor. That is, the multiplexer 130 can stop the driving unit of the brushless DC motor according to the ground signal.

In addition, the multiplexer 130 selects and outputs the inverted phase signal when the value of the forward and reverse signals is input to the selection input of the multiplexer 130, and when the value of the selected input is 1, If the value is 0, the first phase signal can be selected and output. As described above, the value output from the multiplexer 130 may vary according to the value of the normal / reverse signal and the signal selected from the inverted phase signal or the first phase signal. As described above, the multiplexer 130 can determine the driving direction of the brushless DC motor by selecting the first phase signal or the inverse phase signal according to the value of the normal / reverse signal received from the signal generator 170, The value of the phase output that is input to the driving unit of the brushless DC motor is determined through the demultiplexer 140 and the logic circuit unit 150 according to the value output from the brushless DC motor 130 so that the rotor of the brushless DC motor rotates in the forward direction or the reverse direction can do.

More specifically, in order to drive a brushless DC motor, the U, V, and W phases of the power supplied to the brushless DC motor must be controlled according to the position of the rotor, that is, the signal state of the hall sensor. In the embodiment of the present invention, control of the U, V, and W phases is performed by the driving logic controller 100 and the phase voltage input to the driving unit inverter (330 in FIG. 3) is controlled according to the logic of Tables 1 and 2, The brushless DC motor is rotated by the phase voltage.

The output values of the hall sensors A, B and C are 011 and the output values are inverted by the inversion circuit 120, the multiplexer 130, the demultiplexer 140, And the logic circuit unit 150, and the signal value input to the driving unit inverter (330 in FIG. The position of the rotor in the inverted state in phase 1 shown in Table 1 will be output to 100 by the Hall sensors A, B, and C, and in order for the rotor with 100 rotation to rotate in the opposite direction, The phase output signal value output through the controller and input to the driving unit inverter (330 in FIG. 3) is equal to 100001.

The brushless direct current (DC) motor is controlled so that the two phase inverters rotate in the forward direction and the reverse direction, respectively, so that the same phase voltage is outputted from the driving unit inverter 330 as described above. 120 and the multiplexer 130 as described above.

That is, when the phase of the rotor is 1 in Table 1, the output value 011 of the hall sensors A, B, and C is input to the inversion circuit unit 120, The output value 0 of the hall sensor C is output as 0 and 1, the output value 1 of the hall sensor B is outputted as 1 and 0, and the output value 1 of the hall sensor C is outputted as 1 and 0.

When a forward / reverse signal (forward rotation signal) having a value of 0 is input to the selection terminal 133 of the multiplexer 130, the multiplexer 130 outputs the output of the multiplexer 130 to the multiplexer 130, Since the first phase signal and the first phase signal are selected and output, the output 011010 is outputted as 011 in the multiplexer 130.

In Table 2, when the phase of the rotor is 6, the output values of the hall sensors (A, B, and C) are 100 and are in the inverted state with the phase 1 rotor (the output value from the Hall sensor is 011) The output value 100 of the hall sensors A, B and C is inputted to the inversion circuit part 120 and is outputted through the non-inversion terminal part 121 and the inverter 122. The output value 1 of the hall sensor A is 1 and 0 The output value 0 of the hall sensor B is output as 0 and 1, and the output value 0 of the Hall sensor C is output as 0 and 1. [

When a forward / reverse signal (reverse rotation signal) having a value of 1 is input to the selection terminal 133 of the multiplexer 130, the multiplexer 130 outputs the signal to the multiplexer 130, Since the first phase signal and the inverted phase signal are selected and output, the output 100101 is outputted to the multiplexer 130 as 011.

As described above, in the case where the positions of the rotors are mutually inverted and each of them rotates in the forward direction and the reverse direction (the phase 1 in Table 1 and the phase 6 in Table 2), the inversion circuit portion 120 and the multiplexer 130 The phase output signal output through the demultiplexer 140 and the logic circuit unit 150 is controlled in the same manner and the phase voltage input to the driving unit inverter 330 is controlled in the same manner . That is, the rotation direction of the brushless motor can be controlled by the configuration of the inversion circuit part 120 and the multiplexer 130 according to the embodiment of the present invention.

The demultiplexer 140 receives the first phase signal or the inverted phase signal selected by the multiplexer 130 by connecting the input terminals 141 to 143 to the output terminal of the multiplexer 130. The operation terminal 140G is connected to the signal generator 170 may determine whether to operate the driving unit of the brushless DC motor according to the pulse signal and the operation signal input from the controller 170. The demultiplexer 140 may receive a signal output from the multiplexer 130 and output a second phase signal when the pulse signal and the operation signal are signals for operating the driving unit. The demultiplexer 140 receives the pulse signal and the operation signal input from the signal generator 170 and the signal output from the multiplexer 130 and outputs the second phase signal, It is possible to determine the rotational speed of the rotor of the lef DC motor or the operation of the brushless DC motor driving unit.

The demultiplexer 140 is connected to the input terminals 141, 142 and 143 of the demultiplexer 140 and the multiplexer 130 so that the multiplexer 130 receives the signals selected from the first phase signal or the inverse phase signal have. The pulse input terminal 140G1 receives the pulse signal from the pulse terminal 172 of the signal generator 170 and the operation input terminal 140G2 receives the operation signal from the operation terminal 173 of the signal generator 170 Input can be received. The demultiplexer 140 demultiplexes the input signals 141 and 142 of the demultiplexer 140 in the absence of the pulse signal (when the pulse signal has a value of 0) or when the operation signal exists (when the operation signal is 1) The second phase signals output from the output stages 144 to 149 of the demultiplexer 140 are all present (for example, the value of the second phase signal is 1) irrespective of the signals input to the demultiplexers 142 and 143 . When the second phase signal having the output signal value of 1 is input to the logic circuit unit 150 having the NAND gate, the phase output signals output from the logic circuit unit 150 are all 0 (meaning no phase output signal) The driving unit of the brushless DC motor may not operate.

The demultiplexer 140 demultiplexes the output signal of the demultiplexer 140 and outputs the demultiplexed signal to the demultiplexer 140. The demultiplexer 140 demultiplexes the demultiplexed signal from the multiplexer 130, 141, 142, and 143 (the first phase signal or the inverted phase signal). One second phase signal may include output values output from the plurality of output stages 144 to 149. [

The plurality of second phase signals output from the demultiplexer 140 are output to any one of the output stages 144 to 149 that are set in advance so as not to be duplicated among the plurality of output stages 144 to 149 according to a signal received from the multiplexer 130. [ The output of this value is 0, and the output of the other output stages 144 to 149 is 1. In this manner, the demultiplexer 140 can output a plurality of second phase signals having an output value of 0 (when there is no output value or the output value is 0 V) at any one output terminal in accordance with a signal input to the input terminals 141 to 143 have. When there is no value output from one of the output stages 144 to 149 of the demultiplexer 140, the phase output signal output through the logic circuit 150 appears as the phase output of Table 1 or Table 2 The driving unit of the brushless DC motor can be operated.

The pulse signal may be, for example, a PWM (Pulse Width Modulation) signal, and the operation time of the demultiplexer 140 may be controlled according to the duty ratio of the PWM signal to adjust the rotation speed of the brushless DC motor driving unit. Specifically, when the duty ratio is increased, the demultiplexer 140 outputs the second phase signal for a longer time, so that the output time of the phase output signal output from the logic circuit 150 becomes longer and the output The longer the time is, the longer the time for operating the driving unit of the brushless DC motor becomes, and the amount of current applied to the windings inside the brushless DC motor increases to increase the electromotive force received by the brushless DC motor rotor. Can be increased.

On the other hand, if the duty ratio is reduced, the time for the demultiplexer 140 to output the second phase signal becomes shorter, and the time for the logic circuit 150 to output the phase output signal becomes shorter. As a result, The time for operating the driving portion of the motor can be shortened. Accordingly, the amount of current applied to the windings inside the brushless DC motor decreases, and the electromotive force received by the brushless DC motor rotor decreases, so that the speed at which the rotor rotates can be reduced.

The demultiplexer 140 may be, for example, a 3- to 8-line demultiplexer, specifically, a 74LS138 demultiplexer.

input


Print
action

Selection
Pulse signal

Operation signal
C
B
A
0
One
2
3
4
5
6
7 X One X X X One One One One One One One One 0 X X X X One One One One One One One One One 0 0 0 0 0 One One One One One One One One 0 0 0 One One 0 One One One One One One One 0 0 One 0 One One 0 One One One One One One 0 0 One One One One One 0 One One One One One 0 One 0 0 One One One One 0 One One One One 0 One 0 One One One One One One 0 One One One 0 One One 0 One One One One One One 0 One One 0 One One One One One One One One One One 0

Table 4 is a truth table of the 74LS138 demultiplexer used in the demultiplexer of the logic controller according to an embodiment of the present invention. The "pulse signal" in Table 4 represents a pulse signal value output from the pulse terminal 172 of the signal generator 170 and the "operation signal" represents the pulse signal output from the operation terminal 173 of the signal generator 170 And 'select A to C' represent values of a signal (a first phase signal or an inverse phase signal) output from the multiplexer 130 and input to the demultiplexer 140. 'Outputs 0 to 7' represent the second phase signal values output from the output stages 144 to 149 of the demultiplexer 140.

Referring to Table 4, the second phase signal may be a plurality of signals output from a plurality of output terminals 144 to 149 of the 3-8 demultiplexer. The demultiplexer 140 receives the signal from the multiplexer 130 when the value of the pulse signal is not 0 (when the value of the pulse signal is 0) or when the value of the operation signal is 1 (when the value of the operation signal is 1) It is possible to output a signal whose value is 1 at its output terminals 144 to 149 irrespective of the value of the signal. When the values of the second phase signals are all 1, the second phase signals are input to the logic circuit unit 150 made of NAND gates and converted into phase output signals having a signal value of 0, So that the rotor does not rotate. In this way, the demultiplexer 140 can control whether the brushless DC motor is driven (ON or OFF) according to the pulse signal or the operation signal.

The demultiplexer 140 demultiplexes the plurality of second phase signals 144 to 149 into a plurality of output terminals 144 to 149 of the demultiplexer 140 according to a signal output from the multiplexer 130. In this case, And the logic circuit unit 150 receives any two of the second phase signals and outputs the phase output signal to operate the driving unit of the brushless DC motor. The description will be made later with the phase output signal of the logic circuit unit 150. [

The logic circuit unit 150 may receive the second phase signal output from the output terminals 144 to 149 of the demultiplexer 140 and perform a logic operation to output the phase output signal. The logic circuit unit 150 may be formed of six NAND gates and each of the NAND gates receives an arbitrary two of the plurality of second phase signals output from the demultiplexer 140, So that the phase output signal can be output. For example, referring to the output of row 9 of Table 4, when the value of the pulse signal input to the demultiplexer 140 is 1, the value of the operation signal is 0, and 1, 1, 0 1, 1, 1, 1, 1, 0, and 1, respectively. At this time, the NAND gates 151 of the NAND gates constituting the logic circuit part 150 receive the second output 145 and the sixth output 149 of these outputs, and perform logic operation to set the value of the phase output signal to 1 And it can be an image output signal corresponding to W- of the phase output of the phase shown in Table 1.

FIG. 2 is a graph illustrating an output of the detection sensor 110 of the logic controller 100 according to an exemplary embodiment of the present invention, and an input of the driving unit according to the output of the detection sensor 110.

Referring to FIG. 2 and Table 1 and Table 2, outputs (Hall sensor A, Hall sensor B, Hall sensor C) of the detection sensor 110 of the logic controller 100 according to an embodiment of the present invention include Hall sensors And outputs the first phase signal in the order of phase 2, phase 3, phase 4, phase 5, and phase 6 from phase 1 of Table 1, and outputs U, V, and W phases The input may change to meet a predetermined value.

Generally, in order to manufacture a brushless DC motor, the order of change of the phases according to the positions of the rotors is determined in advance, and values of output phase outputs (U, V, W) according to the order of change are also determined. In this way, the driving of the brushless DC motor is controlled according to the predetermined value, and the control method of the driving part of the conventional brushless DC motor is controlled by using the MCU or DSP element. However, in the conventional control method, the MCU or DSP element performs not only the control of the brushless DC motor but also the control of the mechanical device using the brushless DC motor and various functions corresponding to the convenience of the user, And the difficulty of maintenance and maintenance was also increased. Also, in order to process various functions as described above at high speed, there is a problem of increasing the manufacturing cost of the brushless DC motor system because an MCU or DSP having a high performance must be used.

However, the logic controller according to an embodiment of the present invention does not use an MCU or a DSP element used in a conventional control method, but consists only of simple elements such as an inverter, a multiplexer, a demultiplexer and a NAND gate, The maintenance and repair are relatively easy, and further, the price reduction effect of the low cost of each device is effective.

3 is a diagram schematically illustrating a configuration of a brushless DC motor system 300 using a logic controller 100 according to an embodiment of the present invention.

3, a brushless DC motor system 300 using a logic controller 100 according to an exemplary embodiment of the present invention includes an external controller 310, a drive logic controller 320, a drive inverter 330, A lef DC motor 340, and a Hall sensor 341.

The external controller 310 is a device that performs overall control of a mechanical device in which the brushless DC motor system 300 using the logic controller 100 according to an embodiment of the present invention is used, A power supply unit (not shown) and a signal generator (not shown). The external controller 310 may generate the pulse signal PWM, the forward / reverse signal DIR, and the operation signal ENA and input the generated signal to the driving unit logic controller 320.

The driving unit logic controller 320 is a control unit for operating the driving unit of the brushless DC motor 340. The driving unit logic controller 320 controls the Hall sensor 341 of the brushless DC motor 340 to detect a first phase And a pulse signal PWM input from the external controller 310, a forward / reverse signal DIR, and an operation signal ENA, Phase output signal for operating the driving unit of the lef DC motor.

The driving unit inverter 330 is an inverter for converting a commonly used DC type signal into an AC type signal and converts the phase output signal, which is a DC type signal outputted from the driving unit logic controller 320, into an AC type signal, (U, V, W) of the image forming unit 340.

The brushless DC motor 340 receives the phase output signal converted into the AC signal at the driving unit inverter 330 and operates the driving unit of the brushless DC motor 340 so that the logic according to the embodiment of the present invention The brushless DC motor system 300 using the controller 100 can transmit power to the mechanical device in which it is used.

The Hall sensor 341 detects the position information of the rotor located inside the brushless DC motor 340 and generates a first phase signal corresponding to the position information and applies the first phase signal to the driving unit logic controller 320 .

4 is a flowchart illustrating a method of controlling a driving unit of a brushless DC motor using the logic controller 100 according to an embodiment of the present invention.

Referring to FIG. 4, the detection sensor 110 detects the position information of the rotor located inside the brushless DC motor and outputs a first phase signal corresponding to the position information (S410). The position information is previously determined in accordance with the polarity of the permanent magnet constituting the brushless DC motor.

The inversion circuit unit 120 outputs the inverted phase signal of the first phase signal and outputs the inverted phase signal without inverting the first phase signal (S420). That is, the inversion circuit unit 120 may receive the first phase signal from the detection sensor 110 and output the inverse phase signal and the first phase signal.

The multiplexer 130 receives the normal and inverted signals from the signal generator 170, receives the first and second inverted phase signals, and determines whether the value of the normal or inverted signal is 0 or 1 (S430). If the value of the normal / reverse signal is not 0, the multiplexer 130 selects and outputs the inverted phase signal (S441a). In contrast, when the value of the normal / reverse signal is 1, the multiplexer 130 selects and outputs the first phase signal (S440b).

The demultiplexer 140 receives a pulse signal and an operation signal from the signal generator 170 and determines whether the value of the pulse signal is 0 or the value of the operation signal is 1 to determine whether to operate the driver of the brushless DC motor (S450). When the value of the pulse signal is 0 or the value of the operation signal is 1, the demultiplexer 140 demultiplexes the first phase signal or the second phase signal according to the first phase signal or the inverse phase signal outputted by the multiplexer 130, (S460a). If the value of the second phase signals is 1, the logic circuit unit 150 performs NAND operation on the second phase signals to output the phase output signals as 0 (S461a), and the driving unit of the brushless DC motor does not operate (S462a).

If the value of the pulse signal is not 0 or the value of the operation signal is not 1, the demultiplexer 140 outputs one of the second phase signals as 0 (S460b) . The logic circuit unit 150 is composed of six NAND gates, and each of the NAND gates receives any two of the second phase signals and performs a NAND operation to correspond to the phase output shown in Table 1 or Table 2 (S461b), and the brushless DC motor driving unit receives the phase output signals through the inverter 330 and operates (S462b).

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: Logic controller
110, 341: hall sensor
120: Reversal
130: multiplexer
140: Demultiplexer
150:
160: Power supply
170: Signal generator
300: Brushless DC Motor System

Claims (15)

A logic controller for controlling a driving unit of a brushless DC motor and having a signal generator,
A plurality of detection sensors for detecting a position of a rotor positioned within the brushless DC motor and outputting a first phase signal corresponding to a position of the rotor;
An inversion circuit for receiving the first phase signal and inverting the first phase signal to output an inverted phase signal and outputting the inverted first phase signal without inverting the first phase signal;
A multiplexer for receiving the first phase signal or the inverted phase signal and selecting one of the first phase signal and the inverted phase signal to output a selected signal;
And determines whether to operate the driving unit in accordance with a pulse signal and an operation signal input from the signal generator, and when the pulse signal and the operation signal are signals for operating the driving unit, the multiplexer A demultiplexer for receiving the selected signal and outputting a second phase signal; And
And a logic circuit unit receiving the second phase signal from the demultiplexer and performing a logic operation to output an phase output signal,
Wherein the multiplexer determines the direction of rotation of the rotor according to a normal signal input from the signal generator and determines the rotational speed of the rotor in accordance with the pulse signal input from the signal generator to the demultiplexer, And the operation of the driving unit is determined according to the second phase signal outputted from the demultiplexer by receiving the selected signal outputted from the multiplexer,
Wherein the multiplexer determines the direction of rotation of the rotor by selecting any one of the first phase signal and the inverted phase signal input from the inverting circuit portion according to the normal and reverse signals input from the signal generator, Wherein the controller determines the direction of rotation of the rotor by selecting the inverted phase signal if there is a value of the normal or reverse signal and selecting the first phase signal if the value of the normal or reverse signal is not present. delete delete The method according to claim 1,
Wherein the multiplexer comprises a quad two input multiplexer. The method according to claim 1,
Wherein the demultiplexer outputs the value of the second phase signal irrespective of the value of the selected signal input from the multiplexer when the value of the pulse signal is absent or when the value of the operation signal is present. . 6. The method of claim 5,
Wherein the demultiplexer comprises a 3-8 demultiplexer,
And the second phase signal is a plurality of signals output from a plurality of output terminals of the 3-8 demultiplexer. The method according to claim 6,
The logic circuit section is composed of six NAND gates,
Wherein each of the NAND gates outputs the phase output signal by performing a NAND operation on any two signals among the plurality of signals output from the demultiplexer. 8. The method of claim 7,
The demultiplexer outputs the value of the second phase signal when there is no value of the pulse signal or the value of the operation signal, and when the value of the second phase signal is present, The output of the phase output signal is prevented from being output by the inverter so that the rotor does not rotate. The method according to claim 1,
Wherein the detection sensor comprises three Hall sensors. The method according to claim 1,
The inversion circuit unit includes:
An inverter for receiving the first phase signal and inverting the first phase signal to output the inverted phase signal; And
A non-inverting terminal receiving the first phase signal and outputting the inverted first phase signal; The logic controller comprising: A method of controlling a driving part of a brushless DC motor using a logic controller including a signal generator, a plurality of detection sensors, an inverting circuit part, a multiplexer, a demultiplexer, and a logic circuit part,
Detecting the position information of the rotor located inside the brushless DC motor and outputting a first phase signal corresponding to the position information of the rotor;
Inverting the first phase signal and outputting an inverted phase signal;
The multiplexer receives a normal and inverted signal from the signal generator and receives the first and the inverted phase signals from the inverting circuit to select either the first phase signal or the inverted phase signal to output a selected signal ;
Determining whether the demultiplexer receives the pulse signal and the operation signal from the signal generator and operates the driving unit;
Outputting a second phase signal according to the selected signal output from the multiplexer when the demultiplexer determines that the driving unit is operated; And
And the logic circuit receives the second phase signal and performs a logic operation to output an phase output signal,
Wherein the multiplexer selects and outputs the first phase signal when there is no value of the normal / reverse signal, and the multiplexer selects and outputs the inverted phase signal when there is a value of the normal / A method of controlling a driving part of a DC motor. 12. The method of claim 11,
Wherein the position information is predetermined in accordance with a polarity of a permanent magnet constituting the rotor. delete 12. The method of claim 11,
Wherein the demultiplexer outputs the value of the second phase signal irrespective of the value of the selected signal selected by the multiplexer when there is no value of the pulse signal or a value of the operation signal. A method of controlling a driving part of a motor. 12. The method of claim 11,
Wherein the phase output signal output from the logic circuit is input to a driving unit of the brushless DC motor through an inverter to drive the driving unit.

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