CN109352738B - Chain saw containing switch reluctance motor - Google Patents

Abstract

The invention discloses a chain saw including a switched reluctance motor, which includes a handle assembly, a machine head assembly controlled by the handle assembly and connected to the handle assembly, and a chain plate and saw chain connected to one side of the machine head assembly. The machine head assembly It includes a casing and a switched reluctance motor that drives the saw chain. The switched reluctance motor is connected to the casing. The present invention uses the switched reluctance motor as the driving device of the chain saw. The switched reluctance motor has the characteristics of high temperature resistance, making the chain saw It can adapt to harsh environments with high temperatures. At the same time, the switched reluctance motor can adapt to the huge dust generated by the chain saw during operation, greatly extending the service life of the chain saw and making the chain saw's working performance more stable.

Description

A chain saw containing a switched reluctance motor

Technical field

The invention belongs to the field of chain saws, and specifically relates to a chain saw including a switched reluctance motor.

Background technique

With the development and popularization of power tools, power tools are now widely used in homes, gardens and other fields. Electric chain saws are a commonly used power tool. Electric chain saws generally use electricity as the power source to drive the motor to work. The motor drives the The cutting edge of the saw chain circulates at high speed to cut wood or branches.

Electric chain saws are often used in high-temperature working conditions. At the same time, electric chain saws will produce a large amount of wood chips and dust during the cutting of wood, causing damage to the chain saw and preventing it from working properly, and reducing the service life of the chain saw.

Contents of the invention

The technical problem to be solved by the present invention is to provide a dust-resistant chain saw including a switched reluctance motor.

In order to solve the above technical problems, the present invention adopts the following technical solution: a chain saw including a switched reluctance motor, including a handle assembly, a machine head assembly controlled by the handle assembly and connected to the handle assembly, and a chain saw connected to one side of the machine head assembly. The chain plate and saw chain, and the machine head assembly include a casing and a switched reluctance motor that drives the saw chain, and the switched reluctance motor is connected to the casing.

Further, a heat dissipation box is provided outside the air outlet of the switched reluctance motor, and a heat dissipation channel connected to the air outlet of the switched reluctance motor is provided on the heat dissipation box. A power controller and a motor controller are provided in the heat dissipation channel.

Further, the power controller is arranged close to the air inlet of the heat dissipation channel, and the motor controller is arranged close to the air outlet of the heat dissipation channel.

Further, the air outlet is provided on the side wall and bottom wall of the heat dissipation box close to the motor controller.

Furthermore, a first positioning groove for fixing the power controller and a second positioning groove for fixing the motor controller are arranged in the heat dissipation box.

Further, a balance block is provided on one side of the heat dissipation box to maintain the balance of the chain saw.

Further, the motor controller includes a detection module that detects the output shaft speed of the switched reluctance motor, a control module and a power conversion module that changes the cutting current. The control module is connected to the detection module and the power conversion module respectively.

Further, a reducer is connected between the switched reluctance motor and the saw chain.

Further, the reducer includes an output gear meshed with the motor gear of the switched reluctance motor, a drive wheel connected to the saw chain, and a drive shaft connecting the output gear and the drive wheel. The output gear and the drive wheel are linked through the drive shaft, and the output gear The diameter is larger than the diameter of the drive wheel.

Further, a bracket is provided in the casing, and bearings are respectively connected to both ends of the drive shaft, and the bearings are fixed in the casing through the bracket.

Compared with the prior art, the beneficial effects of the present invention are:

1. By using the switched reluctance motor as the driving device of the chain saw, the switched reluctance motor has the characteristics of high temperature resistance, so that the chain saw can adapt to the harsh environment of high temperature. At the same time, the switched reluctance motor can adapt to the huge dust generated by the chain saw when working, which greatly extends the service life of the chain saw and makes the working performance of the chain saw more stable.

2. By arranging the power controller and motor controller in the heat dissipation channel outside the air outlet of the switched reluctance motor, the air inlet of the switched reluctance motor is not blocked, so that there is enough air inlet space and a large amount of air inlet. The cold air enters through the air inlet of the switched reluctance motor, and then passes through the interior of the switched reluctance motor to dissipate heat to the internal components of the motor. Finally, it enters the heat dissipation channel through the air outlet of the switched reluctance motor, and radiates heat to the power controller in the heat dissipation channel. Conduct heat dissipation with the motor controller so that the MOS tube of the control board placed at the air inlet of the switched reluctance motor can get good cooling. At the same time, the enameled wire of the motor has enough air inlet volume to provide heat dissipation; first, conduct the internal components of the switched reluctance motor. Heat dissipation, and then dissipate heat to the power controller and motor controller installed outside the switched reluctance motor, ensuring the heat dissipation effect inside the switched reluctance motor, enabling the chain saw to adapt to high temperature conditions and extending the service life of the motor.

3. The power controller and the motor controller are arranged in sequence in the heat dissipation channel, and the cold air can pass through the motor controller and the power controller in sequence, thereby improving the heat dissipation effect of the motor controller and the power controller.

4. When the cold air in the heat dissipation duct reaches the position of the motor controller, because there are air outlets on the side walls and bottom walls of the heat dissipation box, the cold air in the heat dissipation channel is dispersed, and part of the cold air passes through the sides of the heat dissipation box. The air outlet on the wall is discharged, and part of the cold air is discharged through the air outlet on the bottom wall of the heat dissipation box. That is, the cold air can dissipate heat to both the upper and lower parts of the motor controller, and the heat dissipation effect is good.

5. The first positioning groove and the second positioning groove prevent the power controller and motor controller from shaking in the heat sink box. Even if the heat sink box rotates in all directions during the use of the chain saw, the power controller and the motor controller will not rotate in all directions. The motor controller will not be damaged by shaking.

6. When the chain saw is placed on a flat surface and the heat dissipation box contacts the flat surface to support the chain saw, the balance block can ensure that both sides of the machine head above the heat dissipation box remain balanced, making the chain saw more stable.

7. The power conversion module includes different cutting current levels corresponding to the cutting of small branches, conventional wood and large straight wood. When the chain saw is turned on, the output current defaults to the lowest level and the chain saw is used to cut wood. At this time, the detection module detects the rotation speed of the output shaft of the switched reluctance motor and transmits the collected data to the control module. The control module Compare the collected speed information with the set prescribed speed. If the current level is just suitable for cutting wood, the speed of the switched reluctance motor is not less than the set prescribed speed. At this time, the chain saw can directly cut the wood. cutting; if it is difficult to cut because the wood is large and the current is small, the speed of the switched reluctance motor will be lower than the set specified speed. At this time, the controller will control the power conversion module to switch the cutting current and increase the cutting current level. position, if the speed of the switched reluctance motor is still lower than the set specified speed, the controller will continue to control the power conversion module to continue switching the cutting current, increase the cutting current gear, and automatically collect data through the motor controller. The operation of switching the cutting current allows the chain saw to adapt to cutting wood of various sizes while saving electricity and energy.

Compared with the existing technology, the present invention uses a switched reluctance motor as the driving device of the chain saw. The switched reluctance motor has the characteristics of high temperature resistance, so that the chain saw can adapt to the harsh environment of high temperature. At the same time, the switched reluctance motor can adapt to the chain saw. The huge dust generated by the saw during operation greatly extends the service life of the chain saw and makes the working performance of the chain saw more stable.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

FIG1 is a perspective view of a chain saw including a switched reluctance motor according to the present invention;

Figure 2 is a schematic cross-sectional view of a chain saw including a switched reluctance motor according to the present invention;

Figure 3 is a partial cross-sectional view of a chain saw including a switched reluctance motor according to the present invention.

Among them: 1. handle assembly; 2. head assembly; 21. housing; 22. switched reluctance motor; 221. air inlet; 222. air outlet; 223. rotor shaft; 224. motor gear; 225. output gear; 226. drive wheel; 227. drive shaft; 228. bracket; 229. bearing; 3. chain plate; 4. saw chain; 5. heat sink; 51. air inlet; 52. air outlet; 6. heat dissipation channel; 7. power controller; 8. motor controller; 9. balance block.

Detailed ways

An embodiment of a chain saw including a switched reluctance motor according to the present invention will be further described with reference to FIGS. 1 to 3 .

A chain saw including a switched reluctance motor, including a handle assembly 1 for holding, a machine head assembly 2 controlled by the handle assembly 1 and connected to the handle assembly 1, and a chain plate 3 connected to one side of the machine head assembly 2 and saw chain 4. The saw chain 4 is arranged around the chain plate 3. The machine head assembly 2 includes a casing 21 and a switched reluctance motor 22 that drives the saw chain 4. The switched reluctance motor 22 is connected to the casing 21 and fixed on the casing 21. one side. By using the switched reluctance motor 22 as the driving device of the chain saw, the switched reluctance motor 22 has the characteristics of high temperature resistance, so that the chain saw can adapt to the harsh environment of high temperature. At the same time, the switched reluctance motor 22 can adapt to the heat generated by the chain saw during operation. The huge amount of dust greatly extends the service life of the chain saw and makes the working performance of the chain saw more stable.

In this embodiment, a heat dissipation box 5 is provided outside the air outlet 222 of the switched reluctance motor 22. The heat dissipation box 5 is provided with a heat dissipation channel 6 connected with the air outlet 222 of the switched reluctance motor 22. A heat dissipation channel 6 is provided inside the heat dissipation channel 6. By disposing the power controller 7 and the motor controller 8 in the heat dissipation channel 6 outside the air outlet 222 of the switched reluctance motor 22, the power controller 7 and the motor controller 8 are positioned at the air inlet 221 of the switched reluctance motor 22. There is no obstruction, so there is enough air inlet space. A large amount of cold air enters through the air inlet 221 of the switched reluctance motor 22, and then passes through the inside of the switched reluctance motor 22 to dissipate heat to the internal components of the motor, and finally passes through the switch. The air outlet 222 of the reluctance motor 22 enters the heat dissipation channel 6 to dissipate heat for the power controller 7 and the motor controller 8 in the heat dissipation channel 6, so that the control panel MOS tube placed at the air inlet 221 of the switched reluctance motor 22 can be well At the same time, the enameled wire of the motor has enough air inlet volume to provide heat dissipation; first, the internal components of the switched reluctance motor 22 are dissipated, and then the power controller 7 and motor controller 8 arranged outside the switched reluctance motor 22 are The heat dissipation ensures the heat dissipation effect inside the switched reluctance motor 22, enables the chain saw to adapt to high temperature working conditions, and prolongs the service life of the motor.

In this embodiment, the power controller 7 is placed close to the air inlet 51 of the heat dissipation channel 6, and the motor controller 8 is placed close to the air outlet 52 of the heat dissipation channel 6, so that the power controller 7 and the motor controller 8 are sequentially located in the heat dissipation channel 6. After setting, the cold air can pass through the motor controller 8 and the power controller 7 in sequence, thereby improving the heat dissipation effect of the motor controller 8 and the power controller 7.

In this embodiment, the exhaust port 52 is arranged on the side wall and the bottom wall of the heat dissipation box 5 close to the motor controller 8. When the cold air in the heat dissipation duct reaches the position of the motor controller 8, because the exhaust port 52 is arranged on the side wall and the bottom wall of the heat dissipation box 5, the cold air in the heat dissipation channel 6 is dispersed, and part of the cold air is discharged through the exhaust port 52 on the side wall of the heat dissipation box 5, and part of the cold air is discharged through the exhaust port 52 on the bottom wall of the heat dissipation box 5. That is, the cold air can dissipate heat for the upper and lower parts of the motor controller 8, and the heat dissipation effect is good.

In this embodiment, a first positioning slot for fixing the power controller 7 and a second positioning slot for fixing the motor controller 8 are provided in the heat dissipation box 5 so that the power supply controller 7 and the motor controller 8 will not be damaged in the heat dissipation box 5 Even if the heat dissipation box 5 rotates in various directions during the use of the chain saw, the power controller 7 and the motor controller 8 will not be damaged due to shaking.

In this embodiment, a balance block 9 is provided on one side of the heat dissipation box 5 to maintain the balance of the chain saw. When the chain saw is placed on a flat surface, the heat dissipation box 5 contacts the flat surface to support the chain saw. The balance block 9 can ensure that the heat dissipation box 5 The two sides of the machine head above are kept balanced, making the chain saw more stable.

In this embodiment, the motor controller 8 includes a detection module for detecting the output shaft speed of the switched reluctance motor 22, a control module and a power conversion module for changing the cutting current. The control module is respectively connected to the detection module and the power conversion module to perform power conversion. The module includes three levels of cutting current for example, the first level: 310V*5A=1550W, the second level: 310V*8A=2480W, the third level: 310V*10A=3100W, the third level corresponds to small branches, regular wood and large trees respectively. Straight street timber cutting.

When the chain saw is turned on, the output current defaults to first level, and the chain saw is used to cut wood. At this time, the detection module detects the rotation speed of the output shaft of the switched reluctance motor 22 and transmits the collected data to the control module. The module compares the collected speed information with the set prescribed speed. If the first-level current is just suitable for cutting wood, the speed of the switched reluctance motor 22 is not less than the set prescribed speed. At this time, the chain saw can directly cut the wood. The wood is cut; if it is difficult to cut because the wood is large and the current is small, the rotational speed of the switched reluctance motor 22 will be lower than the set prescribed rotational speed. At this time, the controller will control the power conversion module to switch the cutting current from one to the other. Switch to the second gear, if the speed of the switched reluctance motor 22 is lower than the set specified speed, the controller will continue to control the power conversion module to switch the cutting current, and switch from the second gear to the third gear, through the motor controller 8. Automatically collect data and switch cutting current, making the chain saw suitable for cutting wood of various sizes while saving electricity and energy.

In this embodiment, a reducer is connected between the switched reluctance motor 22 and the saw chain 4 . The reducer includes an output gear 225 meshed with the motor gear 224 of the switched reluctance motor, a driving wheel 226 connected to the saw chain 4 and a connection The output gear 225 and the drive wheel 226 are connected through the drive shaft 227 , and the diameter of the output gear 225 is larger than the diameter of the drive wheel 226 . During operation, the rotor shaft 223 of the switched reluctance motor 22 rotates, driving the motor gear 224 connected to the rotor shaft 223 to rotate. The motor gear drives the output gear 225 meshed with it to rotate. The output gear drives the driving wheel 226 to rotate through the drive shaft 227. The driving wheel drives the saw chain to work. By setting the diameter of the output gear to be larger than the diameter of the driving wheel, it has the effect of reducing the speed between the switched reluctance motor and the saw chain. The reducer occupies a small space and operates stably, ensuring that the saw chain The chain can run at low speed for a long time, extending the service life of the chain saw. A bracket 228 is provided in the casing 21. Bearings 229 are connected to both ends of the drive shaft 227. The bearings are fixed in the casing through the brackets. Through the bracket and the bearing Position the reducer through a simple structure to prevent shaking and make it more stable.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (5)

1. A chain saw including a switched reluctance motor, including a handle assembly, a machine head assembly controlled by the handle assembly and connected to the handle assembly, and a chain plate and saw chain connected to one side of the machine head assembly, characterized in that: The machine head assembly includes a casing and a switched reluctance motor that drives the saw chain, and the switched reluctance motor is connected to the casing; a heat dissipation box is provided outside the air outlet of the switched reluctance motor, and a heat dissipation box is provided on the heat dissipation box. A heat dissipation channel connected to the air outlet of the switched reluctance motor. A power controller and a motor controller are provided in the heat dissipation channel. The power supply controller is located close to the air inlet of the heat dissipation channel, and the motor controller is close to the heat dissipation channel. The air outlet is provided; the air outlet is provided on the side wall and bottom wall of the heat dissipation box close to the motor controller; the heat dissipation box is provided with a first positioning slot for fixing the power controller and a third positioning slot for fixing the motor controller. Two positioning grooves; one side of the heat dissipation box is provided with a balance block to maintain the balance of the chain saw. 2. A chain saw including a switched reluctance motor according to claim 1, characterized in that: the motor controller includes a detection module for detecting the output shaft speed of the switched reluctance motor, a control module and a module for changing the cutting current. Power conversion module, the control module is connected to the detection module and the power conversion module respectively. 3. A chain saw including a switched reluctance motor according to claim 1, characterized in that: a reducer is connected between the switched reluctance motor and the saw chain. 4. A chain saw including a switched reluctance motor according to claim 3, characterized in that: the reducer includes an output gear meshed with the motor gear of the switched reluctance motor, a drive wheel connected to the saw chain and A drive shaft connects the output gear and the drive wheel. The output gear and the drive wheel are linked through the drive shaft. The diameter of the output gear is larger than the diameter of the drive wheel. 5. A chain saw comprising a switched reluctance motor according to claim 4, characterized in that a bracket is arranged in the casing, two ends of the driving shaft are respectively connected with bearings, and the bearings are fixed in the casing through the bracket.