CN110912319A

CN110912319A - Integrated brushless motor driving device for mower

Info

Publication number: CN110912319A
Application number: CN201911152491.0A
Authority: CN
Inventors: 王杨锋; 蒋伟国
Original assignee: Hengdian Group Innuovo Electric Co Ltd
Current assignee: Hengdian Group Innuovo Electric Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-03-24

Abstract

The invention relates to a device in the technical field of mowers, in particular to an integrated brushless motor driving device for a mowers. Including driver, motor housing, brushless motor and arresting gear, separate through the baffle between brushless motor and the driver, can effectively utilize the inner space of motor housing, reduce the whole space that utilizes of brushless motor and driver, be favorable to reducing drive section's ambient temperature again simultaneously. The braking device is mainly used for the situation that the brushless motor needs to be stopped suddenly.

Description

Integrated brushless motor driving device for mower

Technical Field

The invention relates to a device in the technical field of mowers, in particular to an integrated brushless motor driving device for a mowers.

Background

At present, lawn mowers using dc brushless motors as power sources, such as dc brushless electric lawn mowers, are available on the market. The cutting knife, the motor, the control mechanism, the chassis and the direct current power supply are arranged in the machine body; the motor is fixed in the middle of the chassis, and the output shaft of the motor is directly connected with the rotary cutter below the chassis; the control mechanism and the direct current power supply are respectively fixed above the chassis; the direct current power supply is electrically connected with the control mechanism through a bus signal wire; all parts are organically connected and combined into an integral structure of the mower. The direct current brushless motor and the motor control system mainly solve the related technical problems of how to form an integral system by the direct current power supply, the direct current brushless motor and the motor control system and the like. The invention has the following positive effects: the control system of the device is a brushless motor controller, has the functions of soft start and self-braking, and the control mechanism can dissipate heat by virtue of the chassis, thereby facilitating future maintenance or replacement of the controller; meanwhile, the device has the advantages of high efficiency, energy conservation, low noise, no maintenance, large torque, environmental protection and the like. However, this solution is not conducive to integrated manufacturing by braking through self-braking and the control mechanism being provided externally.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems and to providing an integrated brushless motor driving apparatus for a lawn mower with a reliable integrated brake design.

In order to achieve the purpose, the technical scheme of the invention comprises a driver, a motor shell, a brushless motor and a braking device, wherein a motor mounting area for mounting the motor and a driver mounting area for mounting the driver are arranged in the motor shell, a partition plate with a wiring hole is further arranged between the motor mounting area and the driver mounting area, the braking device for braking the brushless motor is arranged on the motor shell, the driver and the brushless motor are connected through a driving signal line, and the driver and the braking device are connected through a braking signal line. The brushless motor and the driver are separated through the partition plate, the inner space of the motor shell can be effectively utilized, the overall utilization space of the brushless motor and the driver is reduced, and meanwhile, the environment temperature of the driving part is favorably reduced. The braking device is mainly used for the situation that the brushless motor needs to be stopped suddenly.

Preferably, the motor shell comprises a lower bottom shell and an upper cover, a bus signal line interface for connecting a bus signal line is arranged on the lower bottom shell, and the bus signal line interface is connected with the driver. The outgoing lines such as the bus signal line and the like are led out and connected through the bus signal line interface in a pull-out mode through punching on the side surface of the lower bottom shell. The leading-out connection can effectively prevent the welding falling problem caused by the pulling of the bus signal wire.

Preferably, the brushless motor comprises a motor stator and a motor rotating shaft, the motor stator is fixedly connected in the motor mounting area, one end of the motor rotating shaft is matched with the motor stator, the other end of the motor rotating shaft extends out of the upper cover, and the motor rotating shaft is rotatably connected with the upper cover.

Preferably, the braking device is arranged on the side of the upper cover close to the motor installation area. The braking device is arranged in the whole device, so that the possibility of dust entering the braking device can be reduced while the internal space is effectively utilized.

Preferably, the braking device comprises a braking friction disc, a rotating shaft friction disc, a braking base and an inductive magnet arranged on the braking base, the braking base is fixedly connected to the upper cover, the rotating shaft friction disc and the rotating shaft of the motor rotate coaxially, the lower friction surface of the rotating shaft friction disc is matched with the upper friction surface of the braking friction disc, an attraction braking block matched with the inductive magnet is arranged on the braking friction disc, and the braking friction disc is connected with the braking base in a sliding mode. The guide screw enables the brake friction disc to move up and down within a certain range. The brake friction disc is made of metal capable of being influenced by magnetic force and used for matching with the induction magnet, and the upper end face of the brake friction disc is provided with a friction surface. The rotating shaft friction disc is in a disc shape, a key or teeth are sleeved on the rotating shaft of the motor in the middle, so that the rotating shaft friction disc and the rotating shaft of the motor are relatively fixed, and the lower end face of the rotating shaft friction disc is also provided with a friction face which is matched with the friction face on the brake friction disc.

Preferably, the brake base is provided with a guide screw, and the brake friction disc is provided with a guide groove matched with the guide screw.

Preferably, the driver has a heat radiating member attached to the lower chassis. The heat dissipation part comprises a heat conduction copper block and heat dissipation fins, part of heat is conducted to the air by the heat dissipation fins, and the residual heat is conducted to the lower bottom shell by the heat conduction copper block so as to achieve the purpose of heat dissipation.

The invention has the following beneficial effects: the space is effectively utilized through the design of the subareas, so that the standardized manufacture is facilitated, and the environmental temperature of the driving part is reduced; the motor is ensured to have reliable braking effect through the braking device.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a side cross-sectional structural schematic of the present invention;

fig. 3 is a schematic cross-sectional view of the braking device of the present invention.

Illustration of the drawings: the device comprises a driver 1, a lower bottom shell 2, an upper cover 3, a partition plate 4, a heat conducting copper block 5, a motor stator 6, a motor rotating shaft 7, a brake friction disc 8, a rotating shaft friction disc 9, a brake base 10 and an induction magnet 11.

Detailed Description

The technical scheme of the invention is further explained by combining the specific embodiment and the attached drawings:

example (b): as shown in fig. 1, 2 and 3, the integrated brushless motor driving device for the lawn mower includes a motor housing composed of a lower base case 2 and an upper cover 3, a brushless motor, a driver 1 and a braking device. The lower bottom shell is injection molded and is divided into a motor mounting area and a driver mounting area, the motor mounting area is integrally in a circular cup shape to adapt to the installation of the brushless motor, the side surface of the motor mounting area is connected with the drive mounting area, and a partition plate 4 with a wiring hole is arranged at the connecting part of the motor mounting area and the drive mounting area. The upper cover is plate-shaped and is connected to the lower bottom shell through a plurality of bolts at the periphery to cover the motor mounting area and the driver mounting area. The upper cover has the maintenance to use the rectangle apron in the position that the driver installing zone corresponds, and the bolt installation that the apron passes through the four corners is covered at the upper cover, and the length and width of rectangle apron all is greater than the length and width size of driver. The drive installation area is rectangular as a whole, and a bus signal line interface is arranged on the opposite side of the side connected with the motor installation area.

The driver is fixed in the drive mounting area through bolts, a bus signal wire is connected to the driver from a bus signal wire interface, a heat-conducting copper block 5 is arranged at the lower end of the driver, a main heating part of the heat-conducting copper block is in contact with the copper block, and the copper block is tightly attached to the lower bottom shell. The copper block can also extend out of the copper radiating fins to extend out of the copper radiating fins for radiating so as to improve the radiating efficiency.

The brushless motor comprises a motor stator 6 and a motor rotating shaft 7, the motor stator is installed in a motor installation area through bolts, and a driving signal line is arranged on the motor stator and connected with a driver. The side face of the motor rotating shaft is matched with a motor stator, one end of the motor rotating shaft is installed at the bottom of a motor installation area, a ball bearing is arranged at the installation position, the other end of the motor rotating shaft extends out of the upper cover to serve as a power output end of the brushless motor, and the ball bearing and a dust ring which limit the motor rotating shaft are arranged at the connection position of the other end and the upper cover.

The brake device comprises a brake friction disc 8, a rotating shaft friction disc 9, a brake base 10 and an inductance magnet 11 arranged on the brake base. The brake base is connected to the upper cover through a bolt, a brake signal line is connected to the driver, three guide grooves are formed in the lower end face of the brake base and are arranged at an angle of 120 degrees, and the brake friction disc is connected with the brake base in a sliding mode in the vertical direction through guide screws arranged in the guide grooves. The guide screw enables the brake friction disc to move up and down within a certain range. The brake friction disc is made of iron and is used for matching with the inductance magnet, and the upper end surface of the brake friction disc is provided with a friction surface. The rotating shaft friction disc is in a disc shape, a key or teeth are sleeved on the rotating shaft of the motor in the middle, so that the rotating shaft friction disc and the rotating shaft of the motor are relatively fixed, and the lower end face of the rotating shaft friction disc is also provided with a friction face which is matched with the friction face on the brake friction disc.

When the brushless motor is used, a signal is sent to the driver through the bus signal line, and the driver drives the brushless motor to start through the driving signal line. The heat that brushless motor produced is isolated at the motor installing zone by the baffle, and the heat that the driver produced is passed to the drain pan down on by the copper billet for the heat conduction to guarantee that the temperature of driver installing zone can not be too high at the during operation. The driving signal line conducts signals to the motor rotor, and the motor rotor drives the motor rotating shaft to rotate according to the signals to complete power output.

When braking is needed, a signal is sent to the driver through the bus signal line, and then the driver drives the braking device through the braking signal line. Or a program preloaded by the driver sends the brake signal directly to the brake device via the brake signal line. After the braking device is started, the inductive magnet takes effect, and the inductive magnet sucks up the braking friction disc. At this time, the friction surfaces of the brake friction discs are in contact with the friction surfaces of the rotating shaft friction discs, and the brake friction discs have only a degree of freedom in the vertical direction and no degree of freedom in the rotating direction around the rotating shaft of the motor, so the brake friction discs do not synchronously rotate due to the friction force between the brake friction discs and the rotating shaft friction discs. The brake friction disc can stop the rotation of the motor rotating shaft through the rotating shaft friction disc.

The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.

Claims

1. The utility model provides an integral type brushless motor drive arrangement for lawn mower, a serial communication port, including driver, motor housing, brushless motor and arresting gear, be equipped with the motor installing zone that is used for installing the motor in the motor housing and be used for installing the driver installing zone of driver, still be provided with the baffle that has the line hole between motor installing zone and the driver installing zone, arresting gear for braking brushless motor sets up on motor housing, there is the drive signal line to connect between driver and the brushless motor, there is the brake signal line to connect between driver and the arresting gear.

2. The integrated brushless motor driving device for the lawn mower according to claim 1, wherein the motor housing comprises a lower base case and an upper cover, the lower base case is provided with a bus signal line interface for connecting a bus signal line, and the bus signal line interface is connected with the driver.

3. The integrated brushless motor driving device of claim 2, wherein the brushless motor comprises a motor stator and a motor shaft, the motor stator is fixedly connected in the motor mounting region, one end of the motor shaft is engaged with the motor stator, the other end of the motor shaft extends out of the upper cover, and the motor shaft is rotatably connected with the upper cover.

4. The integrated brushless motor driving device of claim 3, wherein the braking unit is provided on a side of the upper cover near the motor mounting area.

5. The integrated brushless motor driving device for the lawn mower according to claim 4, wherein the braking device comprises a brake disc, a rotating shaft friction disc, a brake base and an induction magnet arranged on the brake base, the brake base is fixedly connected to the upper cover, the rotating shaft friction disc and the rotating shaft of the motor rotate coaxially, a lower friction surface of the rotating shaft friction disc is matched with an upper friction surface of the brake disc, the brake disc is provided with an attraction brake block matched with the induction magnet, and the brake disc is connected with the brake base in a sliding manner.

6. The integrated brushless motor driving device for a lawn mower according to claim 5, wherein said brake base is provided with a guide screw, and said brake disk is provided with a guide groove engaged with the guide screw.

7. The integrated brushless motor driving device for lawn mower according to claim 2, wherein said driver has a heat dissipating member attached to the lower chassis.