KR20150104240A - Electromotion grinder using remote control BLDC motor - Google Patents

Abstract

The present invention relates to a BLDC motor used for smoothing a welding portion and removing paint and removing rust while manufacturing a ship. More specifically, the present invention comprises: an adapter controlling a BLDC moter by supplying a signal to each phase (U,V,W) of the BLDC motor and receiving the signal sensed in a hall sensor; the BLDC motor connected with the adapter with a plurality of signal lines to be operated; and a spiral bevel gear bending a rotational force of the BLDC motor at a right angle to be transmitted. The BLDC electric grinder is configured to be able to be rotated by being bent at the right angle using the spiral bevel gear, and a disk is inserted into and coupled to a rotational shaft to enable a worker to easily grip the grinder to work. Moreover, the BLDC electric grinder has durability and reliability.

Description

[0001] The present invention relates to a remote control grinder,

[0001] The present invention relates to a remote controlled BIELD electric grinder used for smoothly welding and removing paint and rust during ship manufacturing, and more particularly, (U, V, W) of the BLDC motor based on the signals sensed by the hall sensor installed in the main body of the vehicle, and an adapter that is connected remotely to the adapter and a plurality of signal lines And a bi-LiDi motor, which is operated by receiving a signal supplied from an adapter, is soft-startable, is manufactured with a reduced caulking torque, and has durability and reliability. .

A conventional grinder used to smooth welds and remove paint and rust during the manufacture of a conventional ship can be roughly classified into two types. One is an air grinder. In the case of an air grinder, the power efficiency is 20% It is impossible to apply the soft start function and it is impossible to apply the torque stop holding function.

Another is electric grinder, 60% power efficiency, which is significantly different from 80% efficiency of BLDC motor. General electric grinder uses brushless universal motor, so durability is greatly reduced and over current and overheating There is a problem in that there is no protection circuit that can prevent the leakage current. In addition, since the soft start function of the electric motor can not be applied, there is always a risk of the user being injured.

Also, in the prior art, there is a problem that a permanent magnet employed in a BI-DC motor is formed as a long one inward and a cogging phenomenon occurs due to a rapid magnetic flux change in the polarity of N and S poles of the magnet.

The reason why the BLDC motor can not be used in the conventional grinder is that it interferes with the operation when the space for employing the controller on one side of the motor can not be ensured or secured and the permanent magnet built in the BLDC motor can not withstand the vibration It is difficult to solve problems such as separation.

A related art is disclosed in Korean Utility Model Application No. 20-0280237 filed by the applicant of the present invention and registered with the Korean Patent Registration No. 20-0280237 for the technical construction of a bottom surface cleaner for ships using compressed air. However, since the soft start is possible and the durability and reliability Which is independent of a grinder employing a BI DS motor, and is more so than a grinder constructed by separating a BI handheld motor controller and a BI handheld motor.

Another technology related to this is disclosed in Korean Patent Laid-Open Publication No. 1994-0008816 filed by the applicant of the present invention, but the technical structure of the valve seat polishing apparatus for a marine valve has been disclosed. However, This is not related to a grinder employing a BI DS motor, and is more like a grinder constructed by separating a BI handheld motor controller and a BI handheld motor.

The problem to be solved by the present invention is to develop a grinder employing a BLDC motor having a life efficiency of at least 80% as compared with the input energy, and to provide a remotely controllable BLDC ) Electric grinder.

Another problem to be solved by the present invention is to dispose two permanent magnets employed in a BIE DC motor and arrange each permanent magnet so as to have a skew of 3 DEG to 7 DEG so that the polarities of the permanent magnets are N and S (BLDC) electric grinder with 20% to 30% significantly reduced cogging torque phenomenon due to rapid magnetic flux change in the pole.

Another object to be solved by the present invention is to provide a BLDC motor having a high energy efficiency and a semi-permanent lifetime for the motor, and a controller for controlling the installed BLDC motor is fixedly mounted on the adapter , A grinder body and an adapter are connected by a signal line to remotely control the BI DS motor.

Another problem to be solved by the present invention is to provide an adapter for supplying a control signal to a bi-dc motor to enable soft start for safety of an operator and to detect overheating and overcurrent of the bi-dc motor to stop the motor to protect the motor .

Another problem to be solved by the present invention is to combine the rising waveform and the falling waveform with the reference waveform and the end logic to control the BD motor by using the sinusoidal PWM signal to prevent the noise generated in the BD motor and to be smoothly driven To provide a BI-DC motor.

Another problem to be solved by the present invention is that a metal ball located in a bearing is coated with an insulator such as polyamide on the inner side of a die-casting which is formed integrally with a rotor which is in contact with each bearing, (Spark), which is a major component of the bearing, is damaged to prevent noise from being generated and durability being deteriorated.

The solution to the problem of the present invention is an adapter for controlling a BLDC motor for supplying a signal to each phase (U, V, W) of a BLDC motor and receiving a signal sensed by the Hall sensor, The BiLDi motor can be soft-started by receiving a signal supplied from the adapter, and is manufactured in a structure of reducing the caulking torque. The remote control BILD To an electric grinder.

According to another aspect of the present invention, there is provided a method for resolving a permanent magnet, the permanent magnet being divided into two permanent magnets, And a cogging torque phenomenon caused by a sudden change in magnetic flux at the N pole and S pole is greatly reduced by 20% to 30%.

A further object of the present invention is to provide a structure in which permanent magnets are embedded in a rotor frame in order to increase durability against vibrations caused by a collision between a rotating force of the grinder and an object contacting the grinder, In addition, it is possible to use a spiral bevel gear to transfer the rotational force by bending it into a memory shape, and to allow the left and right replacements of the knob to use both outer right handed knobs, soft start for safety of the operator, The present invention provides a remote control BIELD C electric grinder which can protect against overcurrent and has a restart prevention function after a power failure.

Another object of the present invention is to provide a method of controlling a grinder and a controller for controlling a BLDC by placing the controller of a grinder where a BLDC motor is located at a distance of at least 1 m, (BLDC) body size (volume) and weight are minimized so that the operator can work for a long time, and the remote control BIO DC electric grinder.

The present invention provides a BLDC electric grinder, so that the energy efficiency relative to the input energy is maintained at 80% or more, and a semi-permanent BLDC motor is employed to increase durability and reliability, have.

Another effect of the present invention is that the permanent magnets employed in the BIST engine are divided into two and each permanent magnet is arranged to have a skew of 3 DEG to 7 DEG so that the polarities of the permanent magnets are N Is to reduce the rattling cogging torque phenomenon by 20% to 30% due to rapid magnetic flux change.

Another effect of the present invention is that the size, shape, and weight of the grinder body portion where the disc is located can be formed to be equal to or more compact than a conventional grinder by providing a BLDC electric grinder, It is excellent, it is possible to soft start for operator's safety, and has a function to protect against overheating and overcurrent of motor, and to provide restart prevention function after power failure.

Another effect of the present invention is to provide a BLDC electric grinder with a spiral bevel gear to transmit a rotational force to the workpiece by using a spiral bevel gear, In order to increase durability against impact, a permanent magnet is embedded in a rotor frame to improve durability and reliability.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows the overall shape of a BLDC electric grinder according to the present invention.
2 shows a structure in which a conventional permanent magnet is used.
FIG. 3 shows a structure in which two permanent magnets are arranged at a skew angle in order to prevent a cogging phenomenon.
Fig. 4 shows the shape of the spiral bevel gear employed in the present invention.
FIG. 5 shows a permanent magnet of a BDC motor embedded in a rotor frame for increasing durability.
FIG. 6 shows a BI DC motor to which the anti-electric potential of the BI motor is applied according to the present invention.
FIG. 7 shows three-phase signals (U, V, W) supplied to a BI DC motor using a DC power supply and a switching device.
FIG. 8 shows a control using a sinusoidal PWM signal as another control method of the BI DC motor.

Hereinafter, the present invention will be described in detail.

The present invention relates to a grinder designed to be used for smoothly welding a spot, removing paint, and removing rust during manufacturing of a ship, comprising an adapter for generating a control signal for controlling the BLDC motor, a signal (BLDC) electric grinder designed and manufactured by separating the grinder body, which is operated by receiving the Biel DC motor. A specific embodiment according to the present invention will be described.

<Examples>

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the drawings.

The conventional grinder used to smooth welds, remove paint, and remove rust during conventional ship manufacturing can be classified into two types, air grinder and electric grinder.

One of them, the power grinders with 20% power loss, has a very high power loss, it is impossible to apply the soft start function, and the torque stop holding function can not be applied.

Another electric grinder has a remarkable difference from the efficiency of a BLDC motor with a power-to-efficiency ratio of 60% or more of 80% or more, and also uses a brushless universal motor to greatly reduce durability and protect against overcurrent and overheating There is a problem that there is no circuit.

Also, in the prior art, there is a problem that a permanent magnet employed in a BI-DC motor is formed as a long one inward and a cogging phenomenon occurs due to a rapid magnetic flux change in the polarity of N and S poles of the magnet.

In addition, since the electric motor can not be applied to the soft start function, there is a risk of the user being injured.

In order to achieve the above object, the present invention provides a technique for solving the above-mentioned prior art, which employs a BLDC motor and includes an adapter for generating a control signal for controlling the BLDC motor and a signal (BLDC) electric grinder designed and manufactured by separating the body of the grinder where the Biel DC motor is located.

A signal line is connected between the adapter and the grinder body, and a signal line can be formed to have a length of at least 1 m to 10 m. Of course, these figures depend on the intentions and needs of the designer or consumer.

A permanent magnet is employed in the BIST motor as shown in FIG. In FIG. 2, permanent magnets are arranged inwardly. In this case, as described above, a sudden change in the magnetic flux of the N pole and the S pole occurs in the polarity of the magnet, thereby causing a cogging torque phenomenon.

In the present invention, in order to greatly improve such a phenomenon, the permanent magnets are arranged in the circumferential direction by dividing the front (green color) and the inside (red color), respectively, as shown in FIG. 3, skew, and offset) to reduce the cogging torque by 20% to 30%.

Cogging The reduction of the torque phenomenon by 20% to 30% means that the magnitude of the cogging torque is reduced based on the state where the skew angle is not given (0 °).

A signal line for supplying a signal to be transmitted and received between the adapter and the BI system is connected to a signal line for supplying power to each phase W, U, V of the BI system, A signal line for supplying power to the Hall sensor, a signal line for turning on / off the power, a signal line for speed control, and other necessary control signals And the like.

That is, the number of signal lines is at least nine (three signals supplying power to each phase (W, U, V), one signal for power on / off, two signals for hall sensor power supply, Three signals measuring the phases of the RBI motors) are required.

In order to improve the workability of a worker, the present invention is configured to transmit a rotational force to a body of a grinder where a BI DS motor is placed by using a spiral bevel gear to break it into a memory shape.

More specifically, the adapter of the BLDC electric grinder according to the present invention is connected to a normal power source 220V or 380V to generate a BLDC control signal to control the BI DC motor located in the body of the grinder A signal for supplying the signal is supplied through a signal line.

In the present invention, a signal supplied from an adapter to a BI DC motor through a signal line will be described in detail.

A microprocessor and a memory are built in the adapter of the present invention, and a control program is mounted in the memory.

Let us examine the signal supplied to each phase (U, V, W) of the BLDC motor rotor through the signal line in the mounted control program.

Speed control for grinding and a PWM control method of a BLDC motor for soft start.

The control method of the BI DC motor according to the present invention is a method of controlling a predetermined direct current power source (which may be, for example, about 310 V) rectified from the commercial voltage (220 V, 380 V) Signal and a PWM signal power supply (PWM, switching device (MOSFET, BJT, IGBT, etc.)) to control the speed of the BDC motor.

More specifically, in order to supply current to each of the phases U, V and W, the gate of the switching element (MOSFET, BJT, IGBT or the like) is turned on or off so as to be connected to one side (drain) And the power is supplied to the phases (U, V, W) of each of the bielsi motors through signal lines to drive the bielsi motors.

In this case, the speed regulation of the motor is determined by the duty ratio of the PWM signal supplied to the gate of the switching device (MOSFET, BJT, IGBT, etc.), and the higher the duty ratio of the PWM signal is, (Rpm) can be obtained.

The soft-start function and means according to the present invention can be achieved by controlling the duty ratio supplied to the switching element to be small at start-up.

This describes a general method of controlling a BI DS using a PWM signal, a DC power supply, and a switching device.

In FIG. 7, the DC power is applied to the upper part and the PWM signal is applied to the gate terminal of the switching element to supply the signals (U, V, W) from the switching element on or off to the BI DC.

Another control method of the BI-DC motor is the control using the sinusoidal PWM signal.

A specific diagram of this is shown in Fig.

(UV, VW, WU) among the waveforms of each phase (U, V, W) obtained by measuring the counter electromotive force induced in each phase (U, V, W) of the BLDC motor rotor located in the grinder body by Hall sensor ) With AND logic and OR logic combine to obtain a 60 ° reference waveform.

In order to drive the sinusoidal wave, the 60 ° reference waveform obtained is accurately calculated by the timer in the CPU and is delayed by 30 ° to generate six sinusoidal PWM waveforms by combining the 60 ° reference waveform and the end logic in synchronization with the rising waveform and the falling waveform, V, and W of the switching elements of the top and bottom of the BLDC motor to supply current to the BLDC motor.

In this way, there is an advantageous effect that noise generated in the motor can be prevented and the motor can be smoothly driven.

The control program of the present invention controls the sinusoidal PWM signal so that the rising waveform and the falling waveform are delayed by 60 ° from the reference waveform by 30 ° and combined with the end logic to generate the six sinusoidal PWM signals simply and accurately.

The U, V, and W signals that are all turned off by the sinusoidal PWM signals supplied to the gates of the six switching elements of the top and bottom of the U, V, and W are supplied to respective phases of the BLDC motor There is an advantageous effect that the current supply is prevented from being cut off and the square-wave noise is prevented from being generated in the BLDC motor.

A control program installed in the memory located in the adapter generates a PWM signal for controlling the speed of the BDC motor in conjunction with a switching element fixed to the PCB substrate, necessary electronic parts, and a CPU.

The sinusoidal PWM signal may be generated by combining the generated PWM signal and sinusoidal wave to supply a signal to each phase (U, V, W) of the rotor located in the grinder body.

In the adapter of the present invention, a power phase detecting unit is provided for efficient control of the BI DC motor and the phase of the power source is detected.

A description will be given of a technical configuration of a BI DC motor employed in a body of a grinder according to the present invention.

In order to increase the durability against the vibration caused by the collision between the rotating force of the grinder and the object touching the grinder, permanent magnets built in the BISTEC motor are designed to be embedded in the rotor frame.

In order to drive a rotor of a BLDC motor, a surge voltage generated by a voltage supplied by switching on or off of a switching element built in an inverter flows along a die-casting with a rotor attached thereto, The ball is prevented from being damaged due to the damage of the ball, which is a main component of the bearing, due to the electric discharge (spark) generated by the metal ball located in the bearing, And an insulator such as polyamide is coated to a certain thickness on the inner side of the die-casting which is formed integrally with the die-casting die.

The structure of the BLDC motor adopted in the present invention is a structure of a BLDC motor, in which an insulator such as polyamide is coated on a surface of a shaft in contact with an inner side of each bearing to prevent electric discharge to smoothly rotate the bearing inside the bearing So that noise is small and durability is excellent.

Further, the structure of the BLDC motor employed in the present invention is such that an insulation washer is provided between a snap-washer and a metal-made snap-fit inserter for fixing the bearing and the bearing adjacent to the fan, and an insulation between the bearing adjacent to the bushing and the metal- The surge voltage is prevented from flowing along the bushing by installing a washer to isolate the bearing from the surge voltage so as to prevent damage of the ball in the bearing, so that the noise is less and the durability is advantageous.

A spiral bevel gear of one side is fixed to a rotary shaft of the BI DS motor, and a disk is fixed to the rotary shaft of the other spiral bevel gear which is rotated to engage with a spiral bevel gear fixed to the rotary shaft of the BI DC motor.

FIG. 4 shows a conventional spiral bevel gear, which is configured to transmit a rotational force by bending it to a memory as shown in FIG. 4, and has a soft and low noise characteristic. One side of the spiral bevel gear is opposite to the rotation axis of the BD motor, Respectively.

The disk is used to smoothly process an object to be processed by a rotating force like a normal grinder.

In the BLDC motor structure of the present invention, a surge voltage generated by a voltage supplied by switching on or off of a switching element built in an inverter for driving a rotor of a BLDC motor flows along a die- When discharging through the frame ground, the ball, which is a main component of the bearing, is damaged by the electric metal discharge (spark) generated by the metal ball located in the bearing, so that the noise is generated and the durability is not deteriorated. An insulator such as polyamide is coated to a certain thickness on the inner side of the die-casting formed integrally with the contacted rotor.

The surface of the shaft contacting with the inside of each of the bearings is coated with a certain thickness of an insulator such as polyamide to prevent electric discharge to prevent the damage of the ball which causes the bearings to rotate smoothly within the bearing, .

Also, in the BISTEC motor used in the present invention, an insulation washer is provided between a metal snapwasher for inserting a bearing and a bearing adjacent to the fan, and an insulation washer is provided between the bushing and a metal bushing. It is designed so that the surge voltage does not flow along the bushing and isolates the bearing from the surge voltage to prevent damage of the ball in the bearing, so that the noise is low and the durability is excellent.

In order to increase the durability against the vibration caused by the collision between the rotating force of the grinder and the object touching the grinder, permanent magnets built in the BISTEC motor are designed to be embedded in the rotor frame. 5 shows a buried permanent magnet.

The present invention adopts an active PFC (Power Factor Correction), and when the PFC is adopted, the power factor is improved to 95% or more theoretically, and the total harmonic component distortion is reduced.

The active PFC is one of a power factor improving circuit and uses a booster-up method which is one of the switching converter technologies for implementing PFC. In implementing such a circuit, active elements such as IC, FET, and diode are used This is the implementation of the control circuit of BIEL DC motor.

The BD motor employed in the present invention is preferably an outer rotor type.

If the current supplied to the BI-DC motor is measured by the current sensor and it is judged that the BI is overheated and / or the current is overcurrent, the motor is protected by stopping the operation of the motor.

In addition, the remote control BDDC electric grinder according to the present invention is equipped with a restart prevention function and means after a power failure in a control program of a controller built in an adapter for safety of an operator.

The construction of the grinder body where the BLDC motor is located will be described in more detail.

The body of the grinder refers to the portion of the grinder that the operator holds by hand. The body of the grinder is largely composed of a handle, a BLDC motor part, a memory connection part and a disk.

The handle 1 13 is located between the portion where the signal line 18 connected to the adapter 11 is connected to the grinder body 12 and the frame where the BI DS motor is located and is easily positioned with the right hand of the operator .

The other handle 2 (19) is provided on the left or right side of the front part of the grinder body 12 and is provided so as to be grasped by the left hand and able to exert a force when grinding.

In the case of the handle 2 (19), it is fixed to the front face of Fig. 1 in the case of a right handle. In Fig. 1, it is provided on the back face in case of the left hand.

The BLDC motor part is between the memory connection and the handle, and the BLDC motor is fixedly installed inside the bracket.

The spiral bevel gear is connected to the memory shaft by a spiral bevel gear. One side of the spiral bevel gear is coupled to the rotary shaft of the BLDC motor. The other side of the spiral bevel gear is coupled to the disk rotation shaft, Shape.

The disc is a part for grinding at the welded part, the paint for removing and the rusted part, and it is rotated at several thousand rpm, so it is necessary for the operator to pay attention.

On one side of the disk, a protective cover 17 is fixed in the direction of the handle to protect the worker from dust generated during grinding. The protective cover 17 may not be provided.

Although the above-described BLDC electric grinder described a technical configuration employing a spiral bevel gear, it is also possible to use a spiral bevel gear without using a spiral bevel gear and directly coupling the disk to the rotary shaft of the BD motor with a reduction gear or another gear It can also be a technical configuration.

The present invention relates to an adapter for controlling a BLDC motor for supplying a signal to each phase (U, V, W) of a BLDC motor and receiving a signal sensed by the hall sensor, and an adapter A spiral bevel gear for bending and transmitting the rotation force of the BI handheld motor at right angles, and a spiral bevel gear so as to be able to rotate at right angles, and a disk is inserted into the rotation shaft, (BLDC) electric grinder having durability and reliability can be provided, so that it is possible to reduce the energy consumption, ensure the safety of the operator, and increase the durability of the grinder, The possibility is very high.

11; Adapter 12; Grinder body
13; Handle 1 14; Bielscience Motor
15; Spiral bevel gear 16; disk
17; Protective cover 18; Signal line
19; Handles 2 20; Commercial voltage plug

Claims (9)

In the BIELD electric grinder,
An adapter connected to the BIU DC motor and connected to the signal line to generate a signal for controlling the BIU motor;
A bi-dc motor configured to rotate by an adapter and a signal supplied remotely by a signal line; And
And a disk fixedly installed on the rotary shaft of the BI-D motor and fixedly installed to perform a grinding operation,
In order to prevent rattling cogging phenomenon as a rapid magnetic flux change occurs in the polarity of one permanent magnet as an N pole and an S pole, the BIST motor uses two permanent magnets to arrange the lower permanent magnets in a circumferential direction Wherein the permanent magnets of the first and second permanent magnets are arranged with their skew angles shifted from each other. The method according to claim 1,
And a skew angle for disposing the permanent magnets in a shifted manner is set between 3 DEG and 7 DEG. The method according to claim 1,
In order to supply current to each phase of the BI DS motor, the switching device is turned on or off by the PWM signal so that the DC power supplied to one side of the switching device is supplied to the phases (U, V, W ) To drive the BI DS motor. The method according to any one of claims 1 to 3,
The BIST DC motor is equipped with an insulation washer between the metal snapwasher to be inserted and the bearing to be fixed adjacent to the fan so that the surge voltage does not flow along the bushing and between the bushing and the adjacent bushing and the metal bushing Remote Controlled Biel D's electric grinder made of insulating washer. The method according to any one of claims 1 to 3,
The BIEL DC motor is manufactured by embedding permanent magnets built in a BIELDIC motor into a rotor frame for the purpose of increasing the durability against vibration generated by a collision between a turning force of the grinder and an object to be machined which is in contact with the grinder. DC electric grinder. The method according to any one of claims 1 to 3,
Wherein the remotely controlled BIELD C electric grinder is equipped with a control program of a controller built in an adapter for safety of the operator, after the power failure, restart prevention means. The method according to any one of claims 1 to 3,
A signal line for transmitting signals between the adapter and the grinder body is composed of three signals for supplying power to each phase (W, U, V) of the BI DS and one signal for turning on / off the power A signal for supplying power to the hall sensor, and signals for three phases (W, U, V) of the BI DS to the Hall sensor. The method according to any one of claims 1 to 3,
The BIEL D'electric grinder is equipped with a spiral bevel gear between the rotary axis of the BD and the rotary axis of the disk to break the disk into a memory shape and transmit the rotational force to the disk. The method according to any one of claims 1 to 3,
The BIELDY electric grinder is designed to measure the current supplied to the BIEL DC motor by a current sensor and to protect the motor by stopping the operation of the motor when it is judged that it is overheating or overcurrent of the BIELDEC motor. Electric grinder.

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