KR101385062B1 - Driving device of bldc motor - Google Patents

Abstract

The present invention relates to a driving device of a BLDC feeder motor capable of supplying a filler metal from the existing welding apparatus by converting the BLDC feeder motor to be driven using a power and a control signal just as they are, which drive a DC feeder motor that has been used is installed on the existing welding apparatus in order to automatically supply the filler metal injected during welding by using the BLDC feeder motor.

Description

BLDC feeder motor driving device {Driving device of BLDC motor}

The present invention is to drive the BLDC motor by using the power and control signals for driving the DC feeder motor that was previously installed and used in the welding apparatus to automatically supply the solvent injected into the welding portion using the BLDC motor during welding. The present invention relates to a BLDC feeder motor driving device configured to supply solubilizers by converting to be installed in an existing welding device.

In general, when welding, the solvent injected into the welding portion is supplied to the set voltage controlled by the thyristor from the welding apparatus so as to control the feed rate using a DC feeder motor.

The voltage supplied from the welding apparatus is configured to control the speed by full-wave rectifying the AC power, and then cutting the signal by a predetermined magnitude and supplying the electric power rectified by the thyristor to the motor.

Since the DC feeder motor employed in the conventional welding apparatus uses a brush, the motor life is short, the energy efficiency of the motor is low, and the volume is larger than that of the BLDC motor having the same performance, thus taking up a lot of space.

In order to use the existing welding device as it is, it is important to use the power supply to the DC feeder motor for feeding the solvent to the welding site as it is used for the power supply and speed control of the BLDC motor.

This is because it is possible to replace only the BLDC motor in many welding apparatuses employing the conventional DC feeder motor.

In order to drive the BLDC motor stably, the signal supplied from the microprocessor to turn on the p-channel FET and the n-channel FET, which are switching elements used to drive the BLDC motor, In order to control the speed of the BLDC motor, a signal controlled and input from the thyristor from the welding apparatus, and a power source for supplying each electronic component constituting the circuit of the controller for controlling the BLDC motor are required.

In order to turn on the p-channel and n-channel FETs, a power supply between 5V and 15V must be supplied.

If the difference between the voltage supplied between the gate and the source is 5V or less, the P-channel FET and the n-channel FET do not operate. If the difference is more than 15V, the P-channel FET and the n-channel FET are damaged. .

However, since the power supplied to the DC feeder motor used in the related art controls the speed by supplying the DC power of about 1V to 30V, the switching element cannot be operated when the voltage is less than 5V, and thus the BLDC motor itself does not operate. If a case occurs, the FET which is a switching element is damaged if it is 15V or more.

Practically, the power supplied to the existing DC feeder motor smooths the peak to peak (PP) value of the cut voltage because the peak to peak (PP) voltage is output to about 73 V when the sine wave is cut by full-wave rectified. Even though the rms value is about 1V, the present invention recognizes that the peak to peak (PP) value of the actual cut voltage is 5V or more.

In addition, the present invention requires a technical configuration in which the welder brakes the feeder motor at the time when welding is completed.

When the welding is to be terminated, even if the motor driving voltage is cut off, the motor is stopped slowly due to the inertia of the motor itself, so that a solvent is continuously injected into the welding portion, thereby not finishing the welding smoothly.

In order to solve this problem, the existing DC feeder motor is configured to brake by installing a separate braking resistor inside the welding machine.

Normal DC motor simply changes the direction of motor rotation when reverse voltage is applied, but in case of BLDC, a small controller for BLDC motor control is added, which causes the controller to be damaged when reverse voltage is applied. A reverse voltage prevention diode is installed to prevent the reverse voltage from being applied.

Due to this reverse voltage diode, there is a problem in that it is impossible to brake the BLDC motor by the braking resistor of the welder.

In Korean Patent Laid-Open No. 10-2009-0090934, when the power is turned off after the electric feeder is turned off, the phase of the driver is initialized to prevent the motor from being distorted, which is different from the input phase of the motor when the power is turned off. The present invention relates to controlling an electric feeder by a method of correcting a motor phase, but the present invention uses a BLDC motor to feed a solvent in a welding apparatus, but is remarkably different from the technical configuration for efficiently controlling the BLDC motor used. There is a difference.

The problem to be solved by the present invention is designed and manufactured to replace the DC feeder motor used for solvent feeding in the conventional welding device with a BLDC motor with high durability, high energy efficiency and small volume in the same output, the existing It is to provide a driving device of BLDC motor designed to use the power supplied to DC feeder motor as it is.

Another problem to be solved by the present invention is to turn on the p-channel (FET) and n-channel (FET) switching element for controlling the speed of the BLDC motor with full-wave rectified power supplied to the existing DC feeder motor The present invention provides a driving device for a BLDC motor having a 5V power supply for supplying power to an electronic device operating at 5V and making a ± 5V to ± 15V power supply.

Another problem to be solved by the present invention is to design a circuit to turn on each power supply using a different ground point for turning on the switching element p-channel (FET) and n-channel (FET) FET, To provide a driving device of a BLDC motor configured to be electrically separated by connecting a signal from the microcomputer and a control unit receiving the same to a photocoupler to turn on a p-channel FET for stable operation in the configuration.

Another problem to be solved by the present invention is to install a power state detector in front of the reverse voltage protection diode to detect whether the power supply, if the power is not supplied for more than the set time braking the BLDC feeder motor welding at the end of welding This is to make it good.

The solution of the present invention is a power source for driving the DC feeder motor used in the conventional welding device to supply the solvent supplied to the welding portion by using a BLDC motor automatically when the BLDC motor BLDC feeder motor driving device using BLDC motor that can increase the durability and energy efficiency by converting.

Another problem solving means of the present invention is to provide a p-channel (FET) and n-channel (FET) switching element for supplying the driving power to the BLDC motor with full-wave rectified power supplied to the existing DC feeder motor The present invention provides a BLDC feeder motor driving apparatus having a 5V power supply for supplying power to an electronic device operating at 5V and making a power supply of ± 5V to ± 15V for turning on.

Another problem solving means of the present invention is to design a circuit to turn on each power supply using a different ground point for turning on the switching element p-channel (FET) and n-channel (FET) FET, In order to achieve a stable operation, the BLDC feeder motor driving device is designed to be electrically separated by connecting a signal from the microcomputer and a control unit receiving the same with a photocoupler to turn on a p-channel FET.

Another problem solving means of the present invention is to install a power state detector using a bidirectional photocoupler, etc. in front of the reverse voltage prevention diode, and detects the power supply from the power state detector, if the power is not supplied for more than the set time BLDC motor All three N-ch FETs are turned on through the controller to apply a brake to the BLDC feeder motor, thereby implementing a BLDC feeder motor drive.

The present invention has an advantageous effect that the existing DC feeder motor configured to use the power supplied to the existing DC feeder motor as it is, excellent durability, high energy efficiency, and easily replaceable with a small BLDC motor. .

Another effect of the present invention is a full-wave rectified power supply to a conventional DC feeder motor to make a power supply of ± 5V to ± 15V for turning on the switching element p-channel FET and n-channel FET, and operates at 5V It provides a 5V power supply for supplying power to the electronic device, which is to stably control the speed of the BLDC motor.

Another effect of the present invention is to design a circuit so as not to exceed the minimum 5V to 15V using the peak-to-peak voltage of the signal cut off a part of the full-wave rectified signal supplied to the existing DC feeder motor to prevent damage to the switching element It is to prevent and to operate normally.

Another effect of the present invention is to configure each of the power supply for turning on the p-channel FET and the n-channel FET switching elements using a different ground point to turn on, PWM signal for stable operation in this configuration The PWM signal from the microcomputer to generate a control unit receiving the same with the photocoupler is electrically isolated by connecting to the photocoupler to stably control the BLDC motor.

Another effect of the present invention is to install a power state detector in front of the reverse voltage protection diode to detect the power supply and turn on the n-channel FET to brake the BLDC feeder motor if the power is not supplied for a set time or more, and thus achieve a good welding finish. It is configured to achieve reverse voltage protection and motor braking at the same time.

FIG. 1 shows a wave rectified waveform and a waveform cut into a thyristor supplied to drive a DC feeder motor by a welding apparatus.
2 is a block diagram for controlling a BLDC Peter motor based on a control signal input from a thyristor.
Figure 3 shows another configuration for controlling the BLDC Peter motor based on the control signal input from the thyristor.
4 shows a circuit for supplying a signal to turn on or off the gate of a p-channel FET.
Figure 5 shows a circuit for supplying a signal for turning on or off the gate of an n-channel FET.
FIG. 6 illustrates that braking resistors cannot be used in a BLDC motor.

Hereinafter, the present invention will be described in detail.

The BLDC feeder motor driving device according to the present invention can drive the BLDC motor to power the DC feeder motor that was previously used in the welding device in order to automatically supply the solvent supplied to the welding portion by using the BLDC motor during welding. It is configured to control the BLDC motor by converting to a power supply.

In addition, the present invention is configured so that the voltage difference between the gate and the source of the switching element is not more than 5V to 15V by using the peak-to-peak voltage cut off a part of the full-wave rectified signal supplied to the existing DC feeder motor switching The circuit is configured to operate normally while preventing damage to the device.

Another technical configuration of the present invention is to install a power state detector using a bidirectional photocoupler, etc. in front of the reverse voltage prevention diode, and detect the power supply from the power state detector if the power is not supplied for more than the set time BLDC motor controller All three N-channel FETs are turned on to brake the BLDC feeder motor to achieve good welding. A specific embodiment of the present invention will be described.

<Examples>

A specific embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a wave rectified waveform and a waveform cut into a thyristor supplied to drive a DC feeder motor by a welding apparatus.

The present invention is configured to control the speed of the BLDC motor by using the waveform as shown in FIG.

2 is a block diagram for controlling a BLDC Peter motor based on a control signal input from a thyristor.

'Feeder motor' and 'BLDC motor' in the present specification have the same configuration and are used interchangeably for easy understanding.

In the present specification, the 'BLDC motor controller' and the 'controller' in which the BLDC motor is omitted have the same meaning, and they are used interchangeably.

That is, FIG. 2 is a configuration having both a power supply for controlling the speed of the ± 15V, 5V and the speed of the BLDC motor required by the controller for controlling the three-phase BLDC motor using the power input through FIG. It is configured to drive a BLDC feeder motor.

Figure 3 shows another configuration for controlling the BLDC Peter motor based on the control signal input from the thyristor.

3 is a power state detector for detecting the state of the power in front of the reverse voltage protection diode, the power state detector detects the power supply if the power is not supplied for more than the set time N-channel through the BLDC motor controller All three FETs are turned on to brake the BLDC feeder motor to achieve good welding.

This configuration is a technical configuration for solving the problem that the solvent feeder motor is continuously fed by the rotational inertia at the position to end the welding is not made clean welding.

In FIG. 2, the present invention is a power source for driving the DC feeder motor that was used in the existing welding device to automatically supply the solvent injected into the welding portion by using the BLDC motor as a power source for driving the BLDC motor The circuit is configured to be controlled by a BLDC motor using the conversion.

That is, the present invention is to replace the DC feeder motor with a BLDC motor while applying the power and functions used in the existing welding device as it is to increase the durability of the device, improve the energy efficiency, and reduce the volume of the feeder motor.

In FIG. 1, (a) shows a waveform of full-wave rectification of an AC power source for controlling the speed of the DC feeder motor, and (b), (c) and (d) shows the waveform for controlling the speed of the DC feeder motor. The waveform which controlled (cut) the waveform which carried out the full wave rectification of AC power by the thyristor is shown.

In the waveforms (a), (b), (c) and (d) of FIG. 1, the waveforms (a), (b), ((b) are used because the speed of the DC feeder motor is controlled using the rms value of each waveform. Among the c) and (d), the motor has the highest rotational speed when supplied with the waveform (a) having the largest rms value, followed by (b), and the slowest (d).

The speed control of the conventional DC feeder motor is configured to change the speed of the DC motor in proportion to the RMS value of the supply waveform when the full-wave rectified signal is supplied to the motor as described above.

When the speed of the motor is controlled by the rms value of the thyristor-controlled waveform, the RMS measurement can be obtained from 1V to 30V.

Looking at the peak-to-peak voltage value of the thyristor-controlled (cut) signal, it was confirmed that 5V or more was maintained even when the rms value was 1V, and it appeared up to about 73V.

In the case of a BLDC motor, the p-channel FET or the n-channel FET, which is a switching element, does not operate when the signal supplied from the microcomputer to the switching element to control the BLDC motor is 5 V or less. Alternatively, the n-channel FET may be damaged causing problems with the durability of the device.

Therefore, when using the power supplied as it is to control the speed of the DC feeder motor for the supply of the solvent in the conventional welding device, the BLDC motor does not operate or the switching element is damaged.

The present invention recognizes the problems of the prior art and controls (cuts) the thyristor of the full-wave rectified waveform supplied from the conventional welding apparatus in order to design and manufacture it so that it can be applied to many conventional welding apparatuses that are already manufactured and used. It should be composed of a circuit that controls the speed of the BLDC motor by using the power signal supplied to the feeder motor.

For this circuit configuration, the BLDC motor is detected by detecting the position of the magnet of the rotating BLDC motor using a hall sensor installed inside the motor in order to detect each phase (u, v, w) of the BLDC three-phase motor. The circuit is designed and manufactured so that the cut waveform is supplied to the BLDC motor by operating the switching element in the controller of the thyristor for the speed control.

That is, according to the present invention, the speed of the BLDC motor and the power supply of the controller for controlling and supplying signals for each phase by detecting each phase of the BLDC motor with a power sensor (waveform) controlled (cut) for speed control in the thyristor. It requires all of the power to control it.

In the BLDC motor controller, as shown in FIGS. 2 and 3, n- which is a switching element installed in the controller of the BLDC motor to detect the phase (U, V, W) of the three phases of the BLDC motor with a hall sensor and supply power at a corresponding time. A channel FET or a p-channel FET is provided and configured to supply a voltage set between 5V and 15V, which is a voltage capable of turning on them.

The present invention is configured to control the speed of the BLDC motor according to the time point at which the waveform is cut, as shown in FIG. 1, when cutting and supplying a signal propagated in the thyristor to control the feeding speed of the feeding motor of the solvent.

The configuration for the speed control of the Peter motor (BLDC motor) according to the present invention is to detect each phase of the three-phase (u, v, w) BLDC motor with a Hall sensor, and based on each detected phase in the BLDC motor controller The power is supplied to the BLDC motor by turning on the switching element and supplied for the speed control in the thyristor.

Specifically, the speed control of the BLDC motor is configured such that the speed of the BLDC motor is controlled by supplying a full-wave rectified AC signal in a thyristor as a phase in which the switching element is turned on, as shown in FIG. 1.

More specifically, the speed control of the BLDC motor will be described.

In waveforms (a), (b), (c) and (d) of FIG. 1 supplied from the welding apparatus, the larger the area of the waveform not cut by the thyristor, the more current is supplied to the BLDC motor, so that the rotational speed is increased. The faster the supply speed of the solvent, the smaller the remaining waveform area after cutting, the smaller the current is supplied to the BLDC motor, so that the rotational speed is reduced to reduce the supply speed of the solvent.

In the waveform of FIG. 1, the order in which the rotation speed of the BLDC motor is high is configured in the order of (a)> (b)> (c)> (d). In Fig. 1, the larger the area diagonally hatched, the faster the motor speed is driven.

The switching element for controlling the BLDC motor is configured to control using an n-channel FET or a p-channel FET.

According to the present invention, three n-channel FETs and three p-channels are provided to supply power to each phase according to the position of a magnet of a BLDC motor detected by a Hall sensor installed inside the motor by speed control using a three-phase BLDC motor. The FET switching element is used to control the speed of the BLDC motor by turning it on or off.

Signals for turning on and off the six switching elements are generated and supplied by the microcomputer in conjunction with the magnet position of the BLDC motor detected by the Hall sensor to operate the switching elements to control the rotational speed of the BLDC motor.

The controller for driving a three-phase BLDC motor employs six switching elements. The six switching elements consist of three n-channel FETs and three p-channel FETs. N-channel FET 1 for each of u, v, and w phases. The dog and one p-channel FET are configured to interlock with each other to supply a drive signal to the BLDC motor.

Next, a look at the power supply of the BLDC motor controller according to the present invention.

According to the present invention, a full-wave rectified power supplied to a conventional DC feeder motor is converted into a power source that does not exceed ± 15V and does not exceed ± 15V using a peak-to-peak voltage obtained by cutting a part of a signal using a thyristor, which is a switching element. It is configured to operate normally while preventing damage to the switching element.

To solve this problem, as shown in FIGS. 2 and 3, three ground points are used in the circuit of the controller for controlling the BLDC motor according to the present invention.

In Figures 2 and 3, the ground point of the circuit that generates + 15V, the signal supplied to the n-channel FET, which is the switching element, is called NGND and is used as the reference ground point.

The voltage for switching the n-channel FET may be configured to use a voltage between + 5V and + 15V.

The p-channel FET, which is a switching element, is supplied with -15V (PGND reference), and the ground point of the circuit generating the supplied signal is called PGND, which has a potential difference of -15V compared to NGND.

The PGND ground point is a ground point of the V _DD power source and is a variable ground point that varies up to -15 V to 58 V compared to the NGND when the power supplied from the welding apparatus is 0 V to 73 V.

The following is the ground point of the power supply used for the microcomputer, which has a voltage + 5V higher than NGND, and is called DGND (which means 'digital ground point').

The voltage input to the Peter motor that controls the supply of solvent from the conventional welding equipment (called 'VDD' for ease of explanation) is about 0V to 73V, but the counter electromotive force generated from the driven motor exceeds 100V momentarily. Since the components of the circuit into which the VDD power is input, it is preferable to use the one with a high withstand voltage of 120 V or more in order to increase the durability of the circuit.

Since the voltage of VDD varies from 0V to 73V on the basis of the NGND described above, the signal supplied from the microcomputer to turn on the p-channel FET switching device is electrically protected to prevent damage to the circuit as shown in FIG. It is preferable to use a photocoupler for separation.

In contrast, the voltage used to turn on the n-channel FET (which is referred to as VCC, which is + 15V for ease of description) is stably operated based on NGND as shown in FIG.

And Figs. 4 and V _CC and V _DD is 5 means the V _CC and V _DD obtained in Figure 3 and Figure 2, and inputs the signal from the microcomputer the input terminal is the controller of Figure 4 and Figure 5, the output signal of FIG. 4 Is input to the gate terminal of the p-channel FET of the switching device, the output signal of Figure 5 is configured to be input to the gate terminal of the n-channel FET of the switching device.

That is, the respective output signals of FIGS. 4 and 5 are used to turn on the p-channel FET and the n-channel FET.

Based on the above-described technical configuration will be described in more detail the important technical configuration constituting the present invention.

The BLDC feeder motor driving apparatus using the power supplied from the welding apparatus includes a signal input unit receiving a signal input from the welding apparatus, and a signal generator for generating a signal for controlling the BLDC motor based on the signal input to the signal input unit. It is included.

In addition, the microcomputer is configured to receive a signal generated by the signal generator and generate a signal for turning on a switching element required to drive the BLDC motor, and to receive a signal for controlling the speed of the BLDC motor from the welder side.

The signal supplied from the signal generator for driving the BLDC motor is a voltage between + 5V required for driving the BLDC motor and ± 5V to ± 15 required for turning on the n-channel FET and the p-channel FET which are switching elements of the BLDC motor. And a signal necessary for speed control of the BLDC motor.

The signal generator for driving the BLDC motor includes a ground point (NGND) for generating turn-on power of an n-channel FET switching element, a ground point (DGND) of a power supply for supplying a microcomputer, and a p-channel FET switching element. The ground point (PGND) required to generate the turn-on power supply is configured, but the reference ground point is composed of the ground point required to generate the turn-on power supply of the n-channel FET switching element.

In the present specification, for the protection of the patent technology of FIG. 2 and FIG. 3, a block diagram is shown while avoiding the description of a specific circuit while describing it to be easily implemented by those skilled in the art.

The BLDC feeder motor driving device maintains the switching element of the phase to turn on in order to control the speed of the BLDC motor, the power supplied to the BLDC motor is full-wave rectified from the welding device is cut by the thyristor It is configured to control the speed by supplying an electrical signal to the phase of the BLDC motor.

The BLDC feeder motor driver turns on the power supply of the p-channel FET switching device for stable operation of the circuit because the ground point (PGND) required to generate the turn-on power supply of the p-channel FET switching device changes significantly compared to the reference ground point (NGND). It is configured to supply using an electrically separated photocoupler.

The following describes the technical configuration of braking the feeder motor in the welder at the time when welding is completed.

When we want to finish welding in the welding machine, even if the power supply to BLDC motor is stopped, it stops slowly due to the rotational inertia of the motor itself. Therefore, the welding finish is not smooth because the solvent is continuously injected into the welding area. No problem may arise.

In order to solve this problem, the existing DC feeder motor is configured to brake by installing a separate braking resistor.

In the case of a BLDC motor, a braking resistor cannot be used by the reverse voltage prevention diode as shown in FIG. This is because, in the case of BLDC, a reverse voltage prevention diode must be adopted to prevent damage of the small controller for controlling the BLDC motor.

The BLDC motor braking according to the present invention is configured to detect a power supply by installing a power state detector in front of a reverse voltage prevention diode, and to brake the BLDC feeder motor if the power is not supplied for a predetermined time, thereby forming a good welding finish. .

Specifically, a power state detector is installed by using a bidirectional photocoupler in front of the reverse voltage prevention diode, and the power state detector detects the power supply and if the power is not supplied for a predetermined time, the N-channel through the BLDC motor controller. Since all three FETs are turned on to short-circuit the three-phase signal supplied to the BLDC motor, the operation of the BLDC feeder motor is stopped to achieve good welding.

The set time is between 30 ms and 50 ms, but it can be set shorter for faster judgment or longer for more accurate judgment.

The power supply for turning on all three N-channel FETs is configured to operate from the power charged in the capacitor.

FIG. 6 is a diagram illustrating that a braking resistor cannot be used due to a reverse voltage prevention diode installed to prevent damage to a controller when using a BLDC motor.

The present invention converts the power to drive the DC feeder motor that was previously installed and used in the welding device to the power to drive the BLDC motor in order to automatically supply the solvent injected during welding using the BLDC motor BLDC feeder By providing a BLDC feeder motor drive that can control the motor to increase the durability and energy efficiency of the motor, it is highly industrially applicable.

Claims (8)

In the BLDC feeder motor driving device using the power supplied from the welding device,
A signal input unit input from the welding apparatus;
A signal generator for generating a signal for controlling the BLDC feeder motor based on the signal input to the signal input unit;
A microcomputer that generates a signal for turning on a switching element required to drive the BLDC feeder motor based on the signal generated by the signal generator; And
It is configured to receive a signal for controlling the speed of the BLDC feeder motor from the welder side thyristor,
The signal generator includes a + 5V signal for driving the BLDC feeder motor, a voltage signal between ± 5V and ± 15 for turning on the n-channel FET and the p-channel FET, which are switching elements of the BLDC feeder motor, and the speed of the BLDC feeder motor. BLDC feeder motor drive, characterized in that for generating a signal supplied from the welder side thyristor for control. delete The method according to claim 1,
The signal generator for driving the BLDC feeder motor includes a ground point (NGND) required to generate turn-on power of the n-channel FET switching device, a ground point (DGND) of a power supply for the microcomputer power supply, and a p-channel FET switching device. Configure the ground point (PGND) needed to generate turn-on power,
BLDC feeder motor drive, characterized in that the reference ground point is the ground point required to generate the turn-on power of the n-channel FET switching element. The method according to claim 1 or 3,
The BLDC feeder motor driving device maintains the p-channel FET and the n-channel FET, which are the switching elements, turned on to supply a signal in a corresponding phase to control the speed of the three-phase BLDC feeder motor.
BLDC feeder motor drive device characterized in that the signal supplied to the phase of the BLDC feeder motor is supplied to the BLDC feeder motor by a signal supplied by a full-wave rectified from the welding device controlled through the thyristor. The method of claim 3,
The BLDC feeder motor driving device turns on the p-channel FET switching device for stable operation of the circuit because the ground point PGND required to generate the turn-on power supply of the p-channel FET switching device is changed significantly compared to the reference ground point NGND. BLDC feeder motor drive, characterized in that the power supply using an electrically separated photocoupler. The method of claim 3,
The BLDC feeder motor driving device further comprises a Hall sensor inside the BLDC feeder motor to detect the magnet position of the three-phase BLDC feeder motor. The method according to claim 1,
The BLDC feeder motor drive prevents the feeder from being fed continuously by inertia when power is supplied to the BLDC feeder motor to terminate welding in the welder. Install the sensor,
BLDC feeder motor drive device, characterized in that by using the power state detector to detect the power supply to the BLDC feeder motor if the power is not supplied for more than the set time. The method of claim 7,
The BLDC feeder motor driving device stops the BLDC feeder motor by shorting the three-phase signal by turning on three n-channel FETs by using a power charged in a capacitor to brake the BLDC feeder motor. Feeder motor drive.

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