A chain saw using a single-phase switched reluctance motor

Abstract

The present invention discloses a chain saw using a single-phase switched reluctance motor, including a guide plate, a saw blade, a housing, a transmission assembly, a single-phase switched reluctance motor, and a controller. The single-phase switched reluctance motor is arranged in the housing, one end of the guide plate is fixed in the housing, the saw blade is connected to the guide plate, the single-phase switched reluctance motor is connected to the saw blade through the transmission assembly, and the controller is arranged in the housing and cooperates with the single-phase switched reluctance motor. Compared with ordinary motors, the overload torque of the single-phase switched reluctance motor can reach 3-5 times the rated value, and its structure is relatively simple, which effectively reduces the production cost. The single-phase switched reluctance motor generates less heat, which can effectively increase the service life of this product.

Description

Technical Field

[0001] The invention relates to a chain saw, in particular to a chain saw adopting a single-phase switched reluctance motor. Background Art

[0002] Most electric chain saw motors are AC series motors, and a few use AC brushless motors. AC series motors have low efficiency, short life, complex processes, and cannot be adjusted in speed; AC brushless motors have high efficiency and adjustable speed but relatively low power and high cost, and the overload torque generally does not exceed 2 times the rated torque. In order to meet market demand and respond to the government's requirements for energy conservation and environmental protection, it is urgent to develop an electric chain saw that can be used in applications that take into account both high speed and low speed and high torque. Summary of the invention

[0003] The present invention aims at the defects in the prior art such as low efficiency, short life, complex process and non-speed regulation of AC series-excited motors; and high efficiency and speed regulation of AC brushless motors but relatively low power, high cost and insufficient overload torque. The present invention provides a new chain saw using a single-phase switched reluctance motor.

[0004] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0005] A chain saw using a single-phase switched reluctance motor includes a guide plate, a saw blade, a housing, a transmission assembly, and also includes a single-phase switched reluctance motor and a controller. The single-phase switched reluctance motor is arranged in the housing, one end of the guide plate is fixed in the housing, the saw blade is connected to the guide plate, the single-phase switched reluctance motor is connected to the saw blade through the transmission assembly, and the controller is arranged in the housing and cooperates with the single-phase switched reluctance motor.

[0006] Compared with ordinary motors, the overload torque of single-phase switched reluctance motors can reach 3-5 times the rated value. Its structure is relatively simple, which effectively reduces the production cost. Single-phase switched reluctance motors generate less heat, which can effectively increase the service life of this product.

[0007] Preferably, the above-mentioned chain saw using a single-phase switched reluctance motor comprises a stator assembly, a rotor assembly, and a coil winding, wherein the coil winding is arranged on the stator assembly, and the rotor assembly is arranged in the stator assembly, and the stator assembly is provided with a first magnetic pole and a second magnetic pole, wherein the first magnetic pole and the second magnetic pole are in the same radial direction, and the rotor assembly is provided with convex teeth, wherein the number of the convex teeth is 4 and the array is arranged on the outer edge of the rotor assembly, and the convex teeth correspond to both ends of the first magnetic pole and both ends of the second magnetic pole.

[0008] Because of the characteristics of magnetic resistance, magnetic flux lines always move along the path with the least magnetic resistance. When current is connected to the coil winding, the coil winding forms magnetic fields on the first pole and the second pole, respectively, so that the stator and rotor assembly rotates to the relative position of the convex teeth to the two ends of the first pole and the two ends of the second pole. By controlling the on-off mode of the current in the coil winding, the generation and elimination of the magnetic field maintain a specific cycle, so that the rotor assembly rotates. Therefore, the speed of the rotor assembly can be quickly controlled by controlling the frequency of the current on-off.

[0009] Preferably, the above-mentioned chain saw using a single-phase switched reluctance motor, the single-phase switched reluctance motor also includes a first magnetic tile and a second magnetic tile, the coil winding includes a first coil winding, the first coil winding is respectively arranged around the two ends of the first magnetic pole and the second magnetic pole, a first magnetic field is formed at the two ends of the first magnetic pole and the second magnetic pole after the first coil winding is energized, the first magnetic tile is located between the two ends of the first magnetic pole, the second magnetic tile is located between the two ends of the second magnetic pole, a second magnetic field is formed between the first magnetic tile and the second magnetic tile, the first magnetic field is in opposite directions to the second magnetic field, and the magnetic flux density of the first magnetic field is greater than the magnetic flux density of the second magnetic field.

[0010] The first magnetic tile and the second magnetic tile are respectively provided to form a second magnetic field. Since the magnetic flux density of the first magnetic field is greater than the magnetic flux density of the second magnetic field, when the first coil winding is energized to form the first magnetic field, the second magnetic field has no effect on the rotation of the rotor assembly; when the first coil winding is de-energized and the first magnetic field disappears, the rotor assembly continues to rotate in the current direction under the action of inertia and the second magnetic field. At this time, the second magnetic field compensates for the kinetic energy lost in the rotation of the rotor assembly after the disappearance of the first coil winding, thereby maintaining high-power operation of this product.

[0011] Preferably, in the above-mentioned chain saw using a single-phase switched reluctance motor, the coil winding includes a second coil winding and a third coil winding, the second coil winding and the third coil winding are respectively arranged around the first magnetic pole and the second magnetic pole, and when the second coil winding is energized, a third magnetic field is formed at both ends of the first magnetic pole and the second magnetic pole, and when the third coil winding is energized, a fourth magnetic field is formed inside the ends of the first magnetic pole and the second magnetic pole, and the second coil winding and the third coil winding are energized alternately.

[0012] When the second coil winding is energized to form the third magnetic field, the rotor assembly rotates under the influence of the third magnetic field; when the second coil winding is de-energized and the third magnetic field disappears, when the third coil winding is energized to form the fourth magnetic field, the rotor assembly continues to rotate in the current direction under the action of inertia and the fourth magnetic field. At this time, the fourth magnetic field compensates for the kinetic energy lost by the rotation of the rotor assembly after the disappearance of the third coil winding, thereby maintaining the high-power operation of this product. Using the third coil winding to replace the magnetic tile can prevent motor failure caused by the demagnetization of the magnetic tile, and the third coil winding is wound on the outside of the stator assembly to prevent foreign objects from entering the motor and damaging the motor, thereby increasing the service life of the motor.

[0013] Preferably, in the above-mentioned chain saw using a single-phase switched reluctance motor, the rotor assembly is provided with an 8-pole magnetic ring, the stator assembly is provided with a Hall plate, the 8-pole magnetic ring cooperates with the Hall plate, and the Hall plate is electrically connected to the controller.

[0014] The 8-pole magnetic ring and the Hall plate are used to detect the rotation position of the rotor assembly and transmit signals to the controller. The controller controls the on and off of the current in the coil, thereby improving the accuracy of controlling the motor speed.

[0015] Preferably, in the above-described chain saw using a single-phase switched reluctance motor, the stator assembly includes a stator upper end plate, a stator core, and a stator lower end plate, the first magnetic pole and the second magnetic pole are arranged on the stator core, and the stator upper end plate and the stator lower end plate are respectively arranged at the upper and lower ends of the stator core.

[0016] The stator core is used to fix the coil, and the stator upper end plate and the stator lower end plate play a fixing role, which are used to fix the stator core and the coil, making it easy to connect the power supply, and at the same time facilitate the assembly and use of this product, thereby improving production efficiency.

[0017] Preferably, in the above-mentioned chain saw using a single-phase switched reluctance motor, the rotor assembly includes a rotor core and a rotor shaft, the rotor core cooperates with the first magnetic pole and the second magnetic pole, and the rotor shaft is connected to the transmission assembly.

[0018] The rotor core rotates as the magnetic field alternately generated / disappears as the current is turned on and off. The rotor core drives the rotor shaft to rotate the transmission component and drive the saw blade to move.

[0019] Preferably, in the above-mentioned chain saw using a single-phase switched reluctance motor, the Hall plate is screwed to the stator upper end plate.

[0020] The Hall plate is fixed to the upper end plate of the stator by means of screw connection. The screw connection has the characteristics of stable connection and is convenient for subsequent replacement and maintenance.

[0021] Preferably, the above-mentioned chain saw using a single-phase switched reluctance motor further includes a fan blade, which is connected to the rotor shaft and located between the transmission assembly and the stator lower end plate.

[0022] The fan blades rotate with the rotor shaft when the reluctance motor is working, which is used to reduce the temperature of the reluctance motor and ensure that this product can operate at a higher power.

[0023] Preferably, in the above-mentioned chain saw using a single-phase switched reluctance motor, the transmission assembly includes a pinion, a gear, an output shaft, and a sprocket, the pinion is arranged at one end of the rotor shaft located at the lower end plate of the stator, one end of the output shaft is connected to the gear, and the other end of the output shaft is connected to the sprocket, the gear meshes with the pinion, and the sprocket meshes with the saw blade.

[0024] The large gear and sprocket are set on the output shaft, and they rotate coaxially through the output shaft transmission. The rotor shaft drives the saw blade on the guide plate through the small gear transmission. The various parts of the transmission assembly cooperate with each other to output the kinetic energy generated by the motor to the saw blade, so that the saw blade rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0027] Figure 3 Schematic diagram of the structure of a single-phase switched reluctance motor in Embodiment 1 of the present invention;

[0028] Figure 4 The motion relationship of the single-phase switched reluctance motor in Embodiment 1 of the present invention is Figure 1 ;

[0029] Figure 5 The motion relationship of the single-phase switched reluctance motor in Embodiment 1 of the present invention is Figure 2 ;

[0030] Figure 6 The motion relationship of the single-phase switched reluctance motor in Embodiment 1 of the present invention is Figure 3 ;

[0031] Figure 7 The motion relationship of the single-phase switched reluctance motor in Embodiment 1 of the present invention is Figure 4 ;

[0032] Figure 8 Schematic diagram of the structure of a single-phase switched reluctance motor in Embodiment 2 of the present invention;

[0033] Fig. 9The motion relationship of the single-phase switched reluctance motor in Embodiment 2 of the present invention is Figure 1 ;

[0034] Fig.10 The motion relationship of the single-phase switched reluctance motor in Embodiment 2 of the present invention is Figure 2 ;

[0035] Fig.11 The motion relationship of the single-phase switched reluctance motor in Embodiment 2 of the present invention is Figure 3 ;

[0036] Fig.12 The motion relationship of the single-phase switched reluctance motor in Embodiment 2 of the present invention is Figure 4 . DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-12 The present invention is further described in detail with specific embodiments, but they are not intended to limit the present invention:

[0038] Example 1

[0039] A chain saw using a single-phase switched reluctance motor includes a guide plate 3, a saw blade 4, a housing 1, a transmission assembly 2, and also includes a single-phase switched reluctance motor 6 and a controller 7. The single-phase switched reluctance motor 6 is arranged in the housing 1, one end of the guide plate 3 is fixed in the housing 1, the saw blade 4 is connected to the guide plate 3, the single-phase switched reluctance motor 6 is connected to the saw blade 4 through the transmission assembly 2, and the controller 7 is arranged in the housing 1 and cooperates with the single-phase switched reluctance motor 6.

[0040] Preferably, the single-phase switched reluctance motor 6 includes a stator assembly 62, a rotor assembly 61, and a coil winding, wherein the coil winding is arranged on the stator assembly 62, and the rotor assembly 61 is arranged in the stator assembly 62. The stator assembly 62 is provided with a first magnetic pole 621 and a second magnetic pole 622, and the first magnetic pole 621 and the second magnetic pole 622 are in the same radial direction. The rotor assembly 61 is provided with a convex tooth 613, and the number of the convex teeth 613 is 4 and the array is arranged on the outer edge of the rotor assembly 61, and the convex teeth 613 correspond to the two ends of the first magnetic pole 621 and the two ends of the second magnetic pole 622.

[0041] Preferably, the single-phase switched reluctance motor 6 also includes a first magnetic tile 66 and a second magnetic tile 67, and the coil winding includes a first coil winding 63, which is respectively arranged around the two ends of the first magnetic pole 621 and the second magnetic pole 622, and a first magnetic field is formed at the two ends of the first magnetic pole 621 and the second magnetic pole 622 after the first coil winding 63 is energized, and the first magnetic tile 66 is located between the two ends of the first magnetic pole 621, and the second magnetic tile 67 is located between the two ends of the second magnetic pole 622, and a second magnetic field is formed between the first magnetic tile 66 and the second magnetic tile 67, and the directions of the first magnetic field and the second magnetic field are opposite, and the magnetic flux density of the first magnetic field is greater than the magnetic flux density of the second magnetic field.

[0042] Preferably, an 8-pole magnetic ring 614 is provided on the rotor assembly 61, and a Hall plate 626 is provided on the stator assembly 62. The 8-pole magnetic ring 614 cooperates with the Hall plate 626, and the Hall plate 626 is electrically connected to the controller 7.

[0043] Preferably, the stator assembly 62 includes a stator upper end plate 624, a stator core 623, and a stator lower end plate 625, the first magnetic pole 621 and the second magnetic pole 622 are arranged on the stator core 623, and the stator upper end plate 624 and the stator lower end plate 625 are respectively arranged at the upper and lower ends of the stator core 623.

[0044] Preferably, the rotor assembly 61 includes a rotor core 611 and a rotor shaft 612 . The rotor core 611 cooperates with the first magnetic pole 621 and the second magnetic pole 622 . The rotor shaft 612 is connected to the transmission assembly 2 .

[0045] Preferably, the Hall plate 626 is screwed to the stator upper end plate 624 .

[0046] Preferably, it further includes a fan blade 5 , which is connected to the rotor shaft 612 and is located between the transmission assembly 2 and the stator lower end plate 625 .

[0047] Preferably, the transmission assembly 2 includes a pinion 22, a large gear 21, an output shaft 24, and a sprocket 23. The pinion 22 is arranged at one end of the rotor shaft 612 located at the stator lower end plate 625, one end of the output shaft 24 is connected to the large gear 21, and the other end of the output shaft 24 is connected to the sprocket 23. The large gear 21 is meshed with the pinion 22, and the sprocket 23 is meshed with the saw blade 4.

[0048] like Figure 4 As shown, Figure 4is the initial state of the single-phase switched reluctance motor 6 in this product. When this product is running, the Hall plate 626 detects the position of the 8-pole magnetic ring 614 and controls the current in the first coil winding 63 to be turned on through the controller 7. At this time, the first coil winding 63 generates magnetic fields on the first magnetic pole 621 and the second magnetic pole 622, respectively. Figure 5 The rotor core 611 is made of stacked silicon steel sheets. Since the magnetic flux always moves along the path with the smallest magnetic resistance, the rotor assembly 61 rotates. When the four protruding teeth 613 on the rotor assembly 61 are respectively opposite to the two ends of the first magnetic pole 621 and the second magnetic pole 622, the magnetic resistance is the smallest. Figure 6 When the Hall plate 626 detects that the 8-pole magnetic ring 614 is located Figure 6 When the current in the first coil winding 63 is disconnected, the controller 7 controls the current in the first coil winding 63 to be disconnected. Figure 7 At this time, the rotor assembly 61 rotates to the position shown in FIG. 1 under the action of inertia and the second magnetic field formed by the first magnetic tile 66 and the second magnetic tile 67. Figure 4 The position shown causes the rotor assembly 61 to repeatedly operate.

[0049] The single-phase switched reluctance motor 6 rotates the small gear 22 to transmit to the large gear 21 , and the large gear 21 drives the sprocket 23 to rotate coaxially. At this time, the saw blade 4 starts to run along with the rotation of the sprocket 23 .

[0050] Example 2

[0051] A chain saw using a single-phase switched reluctance motor includes a guide plate 3, a saw blade 4, a housing 1, a transmission assembly 2, and also includes a single-phase switched reluctance motor 6 and a controller 7. The single-phase switched reluctance motor 6 is arranged in the housing 1, one end of the guide plate 3 is fixed in the housing 1, the saw blade 4 is connected to the guide plate 3, the single-phase switched reluctance motor 6 is connected to the saw blade 4 through the transmission assembly 2, and the controller 7 is arranged in the housing 1 and cooperates with the single-phase switched reluctance motor 6.

[0052] Preferably, the single-phase switched reluctance motor 6 includes a stator assembly 62, a rotor assembly 61, and a coil winding, wherein the coil winding is arranged on the stator assembly 62, and the rotor assembly 61 is arranged in the stator assembly 62. The stator assembly 62 is provided with a first magnetic pole 621 and a second magnetic pole 622, and the first magnetic pole 621 and the second magnetic pole 622 are in the same radial direction. The rotor assembly 61 is provided with a convex tooth 613, and the number of the convex teeth 613 is 4 and the array is arranged on the outer edge of the rotor assembly 61, and the convex teeth 613 correspond to the two ends of the first magnetic pole 621 and the two ends of the second magnetic pole 622.

[0053] Preferably, the coil winding includes a second coil winding 64 and a third coil winding 65, and the second coil winding 64 and the third coil winding 65 are respectively arranged around the first magnetic pole 621 and the second magnetic pole 622. When the second coil winding 64 is energized, a third magnetic field is formed at both ends of the first magnetic pole 621 and the second magnetic pole 622. When the third coil winding 65 is energized, a fourth magnetic field is formed on the inner sides of both ends of the first magnetic pole 621 and the second magnetic pole 622. The second coil winding 64 and the third coil winding 65 are energized alternately.

[0054] Preferably, an 8-pole magnetic ring 614 is provided on the rotor assembly 61, and a Hall plate 626 is provided on the stator assembly 62. The 8-pole magnetic ring 614 cooperates with the Hall plate 626, and the Hall plate 626 is electrically connected to the controller 7.

[0055] Preferably, the stator assembly 62 includes a stator upper end plate 624, a stator core 623, and a stator lower end plate 625, the first magnetic pole 621 and the second magnetic pole 622 are arranged on the stator core 623, and the stator upper end plate 624 and the stator lower end plate 625 are respectively arranged at the upper and lower ends of the stator core 623.

[0056] Preferably, the rotor assembly 61 includes a rotor core 611 and a rotor shaft 612 . The rotor core 611 cooperates with the first magnetic pole 621 and the second magnetic pole 622 . The rotor shaft 612 is connected to the transmission assembly 2 .

[0057] Preferably, the Hall plate 626 is screwed to the stator upper end plate 624 .

[0058] Preferably, it further includes a fan blade 5 , which is connected to the rotor shaft 612 and is located between the transmission assembly 2 and the stator lower end plate 625 .

[0059] Preferably, the transmission assembly 2 includes a pinion 22, a large gear 21, an output shaft 24, and a sprocket 23. The pinion 22 is arranged at one end of the rotor shaft 612 located at the stator lower end plate 625, one end of the output shaft 24 is connected to the large gear 21, and the other end of the output shaft 24 is connected to the sprocket 23. The large gear 21 is meshed with the pinion 22, and the sprocket 23 is meshed with the saw blade 4.

[0060] like Fig. 9 As shown, Fig. 9 is the initial state of the single-phase switched reluctance motor 6 in this product. When this product is running, the Hall plate 626 detects the position of the 8-pole magnetic ring 614 and controls the current in the second coil winding 64 to be turned on through the controller 7. At this time, the second coil winding 64 generates magnetic fields on the first magnetic pole 621 and the second magnetic pole 622, respectively. Fig.10The rotor core 611 is made of stacked silicon steel sheets. Since the magnetic flux always moves along the path with the smallest magnetic resistance, the rotor assembly 61 rotates. When the four protruding teeth 613 on the rotor assembly 61 are respectively opposite to the two ends of the first magnetic pole 621 and the second magnetic pole 622, the magnetic resistance is the smallest. Fig.11 When the Hall plate 626 detects that the 8-pole magnetic ring 614 is located Fig.11 When the rotor assembly 61 is in the position shown in FIG. 1 , the controller 7 controls the current in the second coil winding 64 to be disconnected, and controls the current in the third coil winding 65 to be turned on. At this time, the rotor assembly 61 rotates to the position shown in FIG. 1 under the action of inertia and the fourth magnetic field formed by the third coil winding 65. Fig.12 The controller 7 controls the current in the second coil winding 64 to be turned on and the current in the third coil winding 65 to be turned off, so that the rotor assembly 61 repeats the operation.

[0061] The single-phase switched reluctance motor 6 rotates the small gear 22 to transmit to the large gear 21 , and the large gear 21 drives the sprocket 23 to rotate coaxially. At this time, the saw blade 4 starts to run along with the rotation of the sprocket 23 .

[0062] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A chain saw using a single-phase switched reluctance motor, comprising a guide plate (3), a saw blade (4), a housing (1), and a transmission assembly (2), characterized in that: It also comprises a single-phase switched reluctance motor (6) and a controller (7), wherein the single-phase switched reluctance motor (6) is arranged in the housing (1), one end of the guide plate (3) is fixed in the housing (1), the saw blade (4) is connected to the guide plate (3), the single-phase switched reluctance motor (6) and the saw blade (4) are connected via a transmission assembly (2), and the controller (7) is arranged in the housing (1) and cooperates with the single-phase switched reluctance motor (6); The single-phase switched reluctance motor (6) comprises a stator component (62), a rotor component (61), and a coil winding, wherein the coil winding is arranged on the stator component (62), the rotor component (61) is arranged inside the stator component (62), the stator component (62) is provided with a first magnetic pole (621) and a second magnetic pole (622), the first magnetic pole (621) and the second magnetic pole (622) are located in the same radial direction, the rotor component (61) is provided with convex teeth (613), the number of the convex teeth (613) is 4 and the convex teeth (613) are arranged in an array on the outer edge of the rotor component (61), and the convex teeth (613) correspond to two ends of the first magnetic pole (621) and two ends of the second magnetic pole (622); The single-phase switched reluctance motor (6) further comprises a first magnetic tile (66) and a second magnetic tile (67), the coil winding comprising a first coil winding (63), the first coil winding (63) being respectively arranged around the two ends of the first magnetic pole (621) and the second magnetic pole (622), and forming a first magnetic field at the two ends of the first magnetic pole (621) and the second magnetic pole (622) after the first coil winding (63) is energized, the first magnetic tile (66) is located between the two ends of the first magnetic pole (621), the second magnetic tile (67) is located between the two ends of the second magnetic pole (622), a second magnetic field is formed between the first magnetic tile (66) and the second magnetic tile (67), the first magnetic field and the second magnetic field are in opposite directions, and the magnetic flux density of the first magnetic field is greater than the magnetic flux density of the second magnetic field.

2. A chain saw using a single-phase switched reluctance motor according to claim 1, characterized in that: The rotor assembly (61) is provided with an 8-pole magnetic ring (614), the stator assembly (62) is provided with a Hall plate (626), the 8-pole magnetic ring (614) cooperates with the Hall plate (626), and the Hall plate (626) is electrically connected to the controller (7).

3. A chain saw using a single-phase switched reluctance motor according to claim 2, characterized in that: The stator assembly (62) comprises a stator upper end plate (624), a stator core (623), and a stator lower end plate (625); the first magnetic pole (621) and the second magnetic pole (622) are arranged on the stator core (623); and the stator upper end plate (624) and the stator lower end plate (625) are respectively arranged at the upper and lower ends of the stator core (623).

4. A chain saw using a single-phase switched reluctance motor according to claim 3, characterized in that: The rotor assembly (61) comprises a rotor core (611) and a rotor shaft (612); the rotor core (611) cooperates with the first magnetic pole (621) and the second magnetic pole (622); and the rotor shaft (612) is connected to the transmission assembly (2).

5. A chain saw using a single-phase switched reluctance motor according to claim 4, characterized in that: The Hall plate (626) is screw-connected to the stator upper end plate (624).

6. A chain saw using a single-phase switched reluctance motor according to claim 5, characterized in that: It also includes a fan blade (5), the fan blade (5) being connected to the rotor shaft (612) and being located between the transmission assembly (2) and the stator lower end plate (625).

7. A chain saw using a single-phase switched reluctance motor according to claim 6, characterized in that: The transmission assembly (2) comprises a pinion (22), a large gear (21), an output shaft (24), and a sprocket (23); the pinion (22) is arranged at one end of the rotor shaft (612) located at the stator lower end plate (625); one end of the output shaft (24) is connected to the large gear (21); the other end of the output shaft (24) is connected to the sprocket (23); the large gear (21) is meshed with the pinion (22); and the sprocket (23) is meshed with the saw blade (4).

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