Chain saw motor

Abstract

The invention provides a chain saw motor, and belongs to the technical field of motors, the chain saw motor comprises a shell, a rotating shaft, a rotor assembly, an electric driver, a stator assembly and a connecting piece, the shell is fixed on the rotating shaft, the rotor assembly is arranged in the shell, the electric driver is arranged in the rotor assembly, the stator assembly is arranged in the electric driver, and the connecting piece is connected with the stator assembly. On the basis of the outer rotor large-torque motor, the load coupling influence of the chain saw is considered during electromagnetic design through multi-target optimal parameters, the core outer rotor large-torque motor can provide strong torque, the maximum torque can reach 4 N.m, the cutting task of thick and large trunks, thick and heavy wood and the like can be easily coped with, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a chain saw motor. Background Art

[0002] The chain saw motor is the core component of the chain saw, responsible for driving the cutting chain of the chain saw to rotate at high speed, thereby achieving the cutting of wood and other materials. At present, most of the electric chain saws on the market use series motors and brushed magnetic steel motors, and DC-powered chain saws generally only use brushed magnetic steel motors. The working efficiency of these two motors is not high. For DC handheld chain saws with limited power capacity, high working efficiency is a very important indicator, which can extend the use time of the chain saw. Therefore, it is necessary to design a chain saw motor with higher efficiency and faster speed. Summary of the invention

[0003] The purpose of the present invention is to provide a chain saw motor to solve the technical problems of slow rotation speed of the existing chain saw motor and poor chain saw cutting effect.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A chain saw motor comprises a shell, a rotating shaft, a rotor assembly, an electric drive, a stator assembly and a connecting piece, wherein the shell is fixed on the rotating shaft, the rotor assembly is arranged inside the shell, the electric drive is arranged inside the rotor assembly, the stator assembly is arranged inside the electric drive, and the connecting piece is connected to the stator assembly.

[0006] Furthermore, the rotating shaft passes through the stator assembly, and a motion bearing is arranged between the rotating shaft and the stator assembly.

[0007] Furthermore, the rotating shaft passes through the connecting piece, and a supporting bearing is arranged between the rotating shaft and the connecting piece.

[0008] Furthermore, the rotating shaft is an outer rotor with 12 slots and 14 poles, the rotor outer diameter is 62mm, the rotor inner diameter is 56.6mm, the permanent magnet outer diameter is 56.6mm, the permanent magnet inner diameter is 50.6mm, the stator outer diameter is 49.4mm, the rotating shaft diameter is 12mm, and the axial length is 25mm.

[0009] Furthermore, the electric drive has a winding spacing of 0.02mm, a slot insulation of 0.15mm, an end winding ≤5mm, and a split winding form. When the speed is less than 5100rpm in low-speed conditions, each phase has 8 turns of winding with 5 wires wound in parallel per turn. When the speed is less than 11000rpm in medium-speed conditions, the winding is changed to 4 turns of winding with 10 wires wound in parallel per turn through a tap. When the speed is less than 21000rpm in high-speed conditions, the winding is changed to 2 turns of winding with 20 wires wound in parallel per turn through a tap.

[0010] Furthermore, the rotor assembly and the stator assembly are made of JFE 0.1mm JNEX900 silicon steel sheets, the rotating shaft is made of 45# steel, the ball bearings, the magnetic steel is made of NdFeB N48 radial magnetization, the permanent magnet is attached to the inner side of the outer rotor, the permanent magnet is installed in 2 axial sections, and the permanent magnet is curved.

[0011] Furthermore, the maximum speed of the motor under no-load weak magnetic control is 21000RPM, and the output speed under load is 11000RPM, 1.6N·m, and 4N·m, respectively.

[0012] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0013] (1) The present invention adopts an outer rotor high torque motor as the basis, and considers the load coupling effect of the chain saw in the electromagnetic design through multi-objective optimization parameters. The core outer rotor high torque motor can provide strong torque, and its maximum torque can reach 4N·m, which can easily cope with the cutting tasks of thick tree trunks, heavy wood, etc., greatly improving the work efficiency;

[0014] (2) Chain saw motors have the characteristic of high speed, which allows the saw blade to rotate more times per unit time, thus achieving fast cutting. The speed of the chainsaw motor can reach several 14,000 rpm, which can complete the cutting operation quickly and accurately, reducing operation time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of a chain saw motor of the present invention;

[0016] Figure 2 This is the wiring diagram of the direct drive chain saw motor winding of the present invention.

[0017] In the attached drawings, 1-housing, 2-rotating shaft, 3-rotor assembly, 4-electric drive, 5-stator assembly, 6-motion bearing, 7-connector, 8-support bearing. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0019] like Figure 1As shown, a chain saw motor includes a housing 1, a rotating shaft 2, a rotor assembly 3, an electric drive 4, a stator assembly 5 and a connecting member 7. The housing 1 is fixed on the rotating shaft 2, the rotor assembly 3 is arranged inside the housing 1, the electric drive 4 is arranged inside the rotor assembly 3, the stator assembly 5 is arranged inside the electric drive 4, and the connecting member 7 is connected to the stator assembly 5. The rotating shaft 2 passes through the stator assembly 5, and a motion bearing 6 is arranged between the rotating shaft 2 and the stator assembly 5. The rotating shaft 2 passes through the connecting member 7, and a support bearing 8 is arranged between the rotating shaft 2 and the connecting member 7.

[0020] In the embodiment of the present invention, Figure 2 As shown, the shaft 2 is an outer rotor with 12 slots and 14 poles, a rotor outer diameter of 62 mm, a rotor inner diameter of 56.6 mm, a permanent magnet outer diameter of 56.6 mm, a permanent magnet inner diameter of 50.6 mm, a stator outer diameter of 49.4 mm, a shaft diameter of 12 mm, and an axial length of 25 mm.

[0021] In the embodiment of the present invention, the electric drive 4 has a winding spacing of 0.02mm, a slot insulation of 0.15mm, an end winding ≤5mm, and a split winding form. When the speed is less than 5100rpm in low-speed conditions, each phase has 8 turns of winding with 5 wires per turn wound in parallel. When the speed is less than 11000rpm in medium-speed conditions, the winding is changed to 4 turns of winding with 10 wires per turn wound in parallel per phase through a tap. When the speed is less than 21000rpm in high-speed conditions, the winding is changed to 2 turns of winding with 20 wires per turn wound in parallel per phase through a tap.

[0022] In the embodiment of the present invention, the rotor assembly 3 and the stator assembly 5 are made of JFE0.1mmJNEX900 silicon steel sheet, the shaft is made of 45# steel, ball bearings, the magnetic steel is made of NdFeB N48 radial magnetization, the permanent magnet is attached to the inner side of the outer rotor, the permanent magnet is installed in two axial segments, and the permanent magnet is radian. The maximum speed of the motor under no-load weak magnetic control is 21000RPM, the load is 11000RPM, 1.6N·m, and the output speed of the load is 4N·m≥4250RPM.

[0023] Table 1 shows the relationship between chain saw motor performance and motor outer diameter and core axial length

[0024]

[0025] This project plan is based on the use of an outer rotor high-torque motor. The load coupling effect of the chain saw is considered in the electromagnetic design through multi-objective optimization parameters. The core outer rotor high-torque motor can provide powerful torque with a maximum torque of 4N·m, which can easily cope with the cutting tasks of thick tree trunks, heavy wood, etc., greatly improving work efficiency.

[0026] High speed technology: The chain saw motor designed this time has the characteristics of high speed, which can make the saw blade rotate more times per unit time, thus achieving fast cutting. The speed of the electric saw motor can reach several 14000rpm, which can quickly and accurately complete the cutting operation, reducing operation time and labor costs.

[0027] Excellent heat dissipation technology: By rationally designing the motor's housing structure, such as adding cooling fins and ventilation ducts, the heat dissipation area is increased, air circulation is promoted, and the heat generated by the motor during operation is quickly removed. The unique arrangement of cooling fins and ventilation duct layout of this design can effectively reduce the motor temperature. Even under long-term high-load operation, the maximum temperature is less than 85°C, which can maintain stable motor performance and avoid motor damage or performance degradation due to overheating.

[0028] Intelligent temperature control system: The electric saw motor designed this time is equipped with an intelligent temperature control device, which can monitor the motor temperature in real time. When the temperature exceeds the set threshold, it automatically starts cooling measures, such as increasing the fan speed and adjusting the motor working mode, to prevent the motor from overheating. This intelligent temperature control system can not only ensure the normal operation of the motor, but also extend the service life of the motor.

[0029] High-precision control system: It can achieve precise speed adjustment. Users can flexibly adjust the speed of the electric saw motor according to different cutting materials, thickness and working requirements. When cutting soft wood, you can choose a lower speed, while when cutting hard materials, you can adjust to a high speed, which can ensure the cutting quality and avoid material waste and excessive wear of the motor.

[0030] Torque control: The advanced control system can accurately control the torque output of the motor, ensuring that during the cutting process, the motor can automatically adjust the torque according to the actual resistance, so that the saw blade always maintains a stable cutting force, avoiding jamming, jumping and other phenomena, and improving the stability and accuracy of cutting.

[0031] Reliable overload protection: When the motor encounters an overload, such as cutting a foreign object or encountering too much resistance, the motor can automatically stop working or reduce power to prevent the motor from burning out due to overload. At the same time, some electric saws will also inform the user of the overload through indicator lights, sound prompts, etc., so that the user can troubleshoot in time and protect the safety of the motor and the user.

[0032] Safe brake device: Equipped with a fast and effective brake device, when the user releases the switch or encounters an emergency, the brake device can quickly stop the saw blade from rotating, reducing the probability of accidental injury. The brake device of the electric saw motor can stop the saw blade in an instant, greatly improving the safety of use.

[0033] Low noise and low vibration technology: By adopting advanced motor design and manufacturing processes, such as optimizing the motor's stator and rotor structure and selecting appropriate electromagnetic parameters, the vibration and noise generated by the motor during operation can be reduced. The electric saw motor in this solution adopts a special stator winding method and rotor balancing technology, which effectively reduces the vibration and noise levels.

[0034] Shock-absorbing materials and measures: High-performance shock-absorbing materials and structures are used at the connection between the motor and the saw body to absorb and reduce the vibration transmitted from the motor to the body. At the same time, the motor housing is soundproofed to reduce the spread of noise, providing users with a relatively quiet working environment and reducing the damage to the user's hearing and the impact on the surrounding environment.

[0035] Efficient energy conversion: The electric saw motor of this design performs well in energy conversion efficiency, and can convert the input electrical energy into mechanical energy to the maximum extent, with an efficiency of up to 90.6%, reducing energy loss. This not only reduces the consumption of electrical energy and saves energy, but also reduces the heating of the motor and improves the working stability and service life of the motor.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A chain saw motor, characterized in that: The invention comprises a housing (1), a rotating shaft (2), a rotor assembly (3), an electric drive (4), a stator assembly (5) and a connecting piece (7), wherein the housing (1) is fixed on the rotating shaft (2), the rotor assembly (3) is arranged inside the housing (1), the electric drive (4) is arranged inside the rotor assembly (3), the stator assembly (5) is arranged inside the electric drive (4), and the connecting piece (7) is connected to the stator assembly (5).

2. A chain saw motor according to claim 1, characterized in that: The rotating shaft (2) passes through the stator assembly (5), and a moving bearing (6) is provided between the rotating shaft (2) and the stator assembly (5).

3. A chain saw motor according to claim 1, characterized in that: The rotating shaft (2) passes through the connecting piece (7), and a supporting bearing (8) is arranged between the rotating shaft (2) and the connecting piece (7).

4. A chain saw motor according to claim 1, characterized in that: The rotating shaft (2) is an outer rotor with 12 slots and 14 poles, with a rotor outer diameter of 62 mm, a rotor inner diameter of 56.6 mm, a permanent magnet outer diameter of 56.6 mm, a permanent magnet inner diameter of 50.6 mm, a stator outer diameter of 49.4 mm, a rotating shaft diameter of 12 mm, and an axial length of 25 mm.

5. A chain saw motor according to claim 1, characterized in that: The electric drive (4) has a winding spacing of 0.02mm, a slot insulation of 0.15mm, an end winding of ≤5mm, and a split winding form. When the speed is less than 5100rpm in low-speed operation, each phase has 8 turns of winding, each turn of 5 wires is wound in parallel. When the speed is less than 11000rpm in medium-speed operation, the winding is changed to 4 turns of winding per phase, each turn of 10 wires is wound in parallel. When the speed is less than 21000rpm in high-speed operation, the winding is changed to 2 turns of winding per phase, each turn of 20 wires is wound in parallel.

6. A chain saw motor according to claim 1, characterized in that: The rotor assembly (3) and the stator assembly (5) are made of JFE 0.1mm JNEX900 silicon steel sheets, 45# steel for the rotating shaft, ball bearings, and the magnetic steel is made of NdFeB N48 radial magnetization. The permanent magnet is attached to the inner side of the outer rotor, and the permanent magnet is installed in two axial sections. The permanent magnet has an arc.

7. A chain saw motor according to claim 1, characterized in that: The maximum speed of the motor under no-load weak magnetic control is 21000RPM, under load is 11000RPM, 1.6N·m, and under load 4N·m the output speed is ≥4250RPM.

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