CN115173624B - Direct current brushless motor for mower with startup protection - Google Patents
Direct current brushless motor for mower with startup protection Download PDFInfo
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- CN115173624B CN115173624B CN202210887213.5A CN202210887213A CN115173624B CN 115173624 B CN115173624 B CN 115173624B CN 202210887213 A CN202210887213 A CN 202210887213A CN 115173624 B CN115173624 B CN 115173624B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/106—Structural association with clutches, brakes, gears, pulleys or mechanical starters with dynamo-electric brakes
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/27—Devices for sensing current, or actuated thereby
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Harvester Elements (AREA)
Abstract
The invention discloses a direct current brushless motor for a mower with startup protection, which comprises a shell, a power device and an adjusting device, wherein the shell is connected with the power device, the power device is in transmission connection with the adjusting device, the adjusting device is movably connected with the shell, the shell comprises a shell, a working cavity is arranged on the shell, the power device comprises a stator and a rotor, the stator and the rotor are respectively arranged on the outer layer and the inner layer of the working cavity, one end of the rotor is provided with a transmission shaft, the shell is used as a main installation foundation, the power device is used for carrying out power input, the mower is protected by the power adjustment of the adjusting device, the cutter blade is prevented from damaging after impacting hard objects, the working cavity in the shell provides a main rotation space, the stator is provided with a plurality of windings, the stator is positioned on the outer ring of the rotor, the rotor is driven to rotate by the coil windings on the stator, and displacement is output outwards by the transmission shaft, so that the cutter blade of the mower is driven to run, and mowing operation is carried out.
Description
Technical Field
The invention relates to the technical field of brushless motors, in particular to a direct current brushless motor with a startup protection function for a mower.
Background
In recent years, with the continuous development of the automation industry, various automation apparatuses gradually enter the mass life, so that the hands of people are greatly liberated, and the quality of life is improved. Especially, after the masses begin to pay attention to environmental protection, various trees and greenbelts are planted and paved in various living and working places, so that the air quality is improved.
After the green land is planted, the lawn needs to be maintained, and the surface repair is generally required by a mower, so that the growth quality of the lawn is improved as much as possible, and a certain ornamental value is met, and therefore, the requirements on a direct current brushless motor for the mower are gradually increased. Because the grass on the lawn grows to be low in height, hard sundries such as stones are easy to appear on the lawn, and when mowing operation is performed, the blade is easy to strike on the hard sundries, and in order to prolong the service life of the blade, the flexible blade is used on a mower. However, the working space of the blade is wrapped by the mower, so that operators cannot observe the cutter collision time on time, the cutter collision is easy to occur continuously, reverse torque is transmitted to the motor, the output shaft is easy to generate torsion deformation, and even the motor is burnt to influence the service life of the motor in severe cases, so that the starting protection is required.
Disclosure of Invention
The invention aims to provide a brushless DC motor for a mower with a startup protection function, which solves the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a direct current brushless motor for lawn mower of attached start-up protection, includes casing, power device and adjusting device, and casing and power device are connected, and power device and adjusting device transmission are connected, and adjusting device and casing swing joint, casing include the casing, are equipped with the working chamber on the casing, and power device includes stator and rotor, and outer and the inlayer in the working chamber are arranged respectively to stator and rotor, and rotor one end is equipped with the transmission shaft.
The casing is the main installation basis, carries out power input through power device, adjusts through adjusting device power to protect the lawn mower, prevent that the blade from striking damage after the hard thing, the working chamber in the casing provides main gyration space, is equipped with a plurality of windings on the stator, and the stator is located the rotor outer lane, drives the rotor through the coil winding on the stator and rotates, and outwards output displacement through the transmission shaft, thereby drive the blade operation of lawn mower, carry out the grass cutting operation.
Further, casing one side is equipped with the end cover, end cover is passed to transmission shaft one end, power device still includes the driver, driver and casing fastening connection, driver and stator electricity are connected, adjusting device and transmission shaft transmission are connected, adjusting device includes the detection subassembly, regulating electromagnet and fixed magnet, the detection subassembly includes the centrifugal disk, first coil, reset spring and folded plate, the centrifugal disk cover is established at the transmission shaft outer lane, centrifugal disk and transmission shaft transmission are connected, be equipped with the detection chamber on the end cover, the detection intracavity is arranged in to the centrifugal disk, be equipped with the change over groove on the centrifugal disk, folded plate and change over groove rotation are connected, folded plate one side is equipped with reset spring, reset spring keeps away from folded plate one end and change over groove fastening connection, change over groove is kept away from reset spring one side and is equipped with the mounting groove, first coil and folded plate constitute detection circuitry, the folded plate is magnet material, the transmission shaft includes input shaft and output shaft intermittent drive connection, be equipped with the regulating groove on the end cover, input shaft and output shaft junction are located the regulating electromagnet, input shaft one side is equipped with regulating electromagnet, output shaft side is equipped with fixed magnet, regulating electromagnet and fixed magnet are arranged in opposite directions, regulating electromagnet and detection circuitry electricity are even.
The output voltage is controlled through the driver, thereby control rotor output rotational speed, working chamber unilateral opening sets up, carry out the shutoff through the end cover, the transmission shaft passes through the bearing to be supported on the end cover, carry out torsion force feedback detection through detecting element, when transmission shaft output torque is obstructed, instantaneous rotational speed reduces, centrifugal disk cover is established on the transmission shaft, rotate through the transmission shaft, make the folded plate on the centrifugal disk centrifugal in the change of the groove, under centrifugal force effect, make folded plate overcome reset spring elasticity rotation, thereby make folded plate insert in the first coil, when the blade operation is obstructed, the transmission shaft rotational speed reduces, folded plate centrifugal force reduces, make folded plate reverse rotation under reset spring elasticity effect, first coil is cutting magnetic induction line motion, produce the detection current, change the magnetic pole magnetism of regulating electromagnet through the detection current, make the opposite ends of regulating electromagnet and fixed magnet keep attracting or repulsive, drive the output shaft and remove along the input shaft through the transmission, thereby control power transmission and interrupt, mower operational safety is improved.
Furthermore, one end of the input shaft is in transmission connection with the rotor, a spline is arranged at one end, far away from the rotor, of the input shaft, a key groove is arranged on the output shaft, the spline is in intermittent contact with the key groove, and a stop groove is arranged at one side, close to the input shaft, of the key groove;
when in transmission: opposite ends of the fixed magnet and the adjusting electromagnet are different-name magnetic poles, a spline of the input shaft is inserted into the key slot, and the input shaft is in transmission connection with the output shaft;
cut-off time: the opposite ends of the fixed magnet and the adjusting electromagnet are homonymous magnetic poles, a spline of the input shaft is inserted into the cut-off groove, and the input shaft is in sliding connection with the output shaft.
When the motor is started, torque is output through the rotor, so that the input shaft is driven to rotate, the input shaft drives the folded plate on the centrifugal disc to centrifuge, the folded plate rotates towards the first coil to generate forward current, the first coil is conducted with the adjusting electromagnet, opposite ends of the adjusting electromagnet and the fixed magnet are heteronymous magnetic poles, the fixed magnet drives the output shaft to move along the axial direction under the action of magnetic pole suction force, and therefore splines on the input shaft are inserted into keyways of the output shaft and clamped through the keyways, the input shaft drives the output shaft to rotate, and therefore external blades are driven to operate, and mowing operation is carried out; when the hard foreign matters are encountered in the mowing process, the operation of the output shaft is hindered, the rotating speed of the output shaft is rapidly reduced, the rotating speed of the input shaft is driven to be reduced, the centrifugal force borne by the folded plate on the centrifugal disc is smaller than the elastic force of the reset spring, the folded plate is enabled to rotate away from the first coil under the action of the elastic force of the reset spring, reverse current is generated on the first coil, when the reverse current exceeds a rated value, the reverse current is conveyed to the regulating electromagnet, the opposite ends of the regulating electromagnet and the fixed magnet are provided with the same-name magnetic poles, under the action of the magnetic pole repulsive force, the axial direction of the input shaft is limited, the output shaft is enabled to move outwards, the spline at the end part of the input shaft slides out of the key groove, the power is interrupted, the blade is prevented from continuously cutting the hard foreign matters, the cutter is prevented from being broken, and meanwhile reverse torque is prevented from being conveyed to the input shaft, torsion deformation is caused, and the service life is influenced.
Further, the centrifugal disc is sleeved on the outer ring of the input shaft, the detection assembly further comprises a second coil, the second coil is located on one side, away from the folded plate, of the installation groove, and the second coil and the folded plate form an adjusting circuit which is electrically connected with the driver.
When current is generated on the regulating circuit, namely the centrifugal speed of the folded plate is too high and exceeds the normal working rotating speed, the relative current on the regulating circuit is monitored, so that the driver is controlled to reduce the speed of the rotor, the no-load power consumption is reduced, and the mowing service time is prolonged.
Further, adjusting device still includes assisting cold subassembly, and rotor keeps away from transmission shaft one end and is equipped with assisting cold axle, is equipped with the drive groove on the casing, assists cold axle one end and inserts in the drive groove, assists cold subassembly and includes fan and fixture block, and the fan input inserts in the drive groove, assists cold axle and is equipped with a plurality of fixture blocks along circumference, is equipped with the air intake on the casing, and the fan is equipped with a plurality of draw-in grooves on the fan towards the air intake, fixture block and draw-in groove intermittent type joint.
Through assisting cold subassembly and carrying out auxiliary cooling, support the rotor through assisting cold axle, when the motor carries out high-speed operation in-process, rotor rotational speed is higher, thereby it is centrifugal to drive the epaxial fixture block of assisting cold, make the fixture block carry out the dead axle rotation along assisting cold axle at centrifugal force effort, fixture block tip joint is in the draw-in groove of fan, make assisting cold axle and pass through the fixture block and drive with the fan, improve high-speed self-cooling performance, avoid empty load, simultaneously reduce the speed to the rotor through the air resistance of the rotatory in-process of fan, avoid the blade operation to influence the mowing performance too soon.
As optimization, one side of the clamping block is provided with a pre-tightening spring, and the pre-tightening spring is positioned at the rear end of the rotation stroke relative to the clamping block. When restarting, the rotor is controlled to rotate reversely through the driver, so that the clamping block is separated from the clamping groove and is reset under the action of the pre-tightening spring, and the detection is convenient to carry out again.
As optimization, the outer side of the fan is provided with a housing, and a plurality of wind eyes are arranged on the housing. Wind filtering is carried out through the wind eye on the housing, so that impurities are prevented from entering the working cavity.
As optimization, the regulating device further comprises a brake electromagnet, the brake electromagnet is electrically connected with the detection circuit, and the brake electromagnet is arranged at one side of the regulating groove;
when the fixed magnet descends, the upper end of the brake electromagnet and the opposite end of the fixed magnet are homonymous magnetic poles, and the lower end of the brake electromagnet and the opposite end of the fixed magnet are heteronymous magnetic poles. The connecting circuit of the detection circuit and the braking electromagnet is provided with a diode, forward current is cut off through the diode, reverse current is conducted, when braking is carried out, the output shaft drives the fixed magnet to descend, the upper end of the braking electromagnet and the opposite end of the fixed magnet are homonymous magnetic poles, the descending speed of the fixed magnet is reduced through magnetic pole repulsive force, when the braking electromagnet passes through the middle layer, the lower end of the braking electromagnet and the opposite end of the fixed magnet are heteronymous magnetic poles, the speed of the fixed magnet away from the braking electromagnet is reduced under the action of magnetic pole attractive force, thereby carrying out secondary braking, assisting the output shaft to slow down through the braking electromagnet, improving the speed-down efficiency and reducing the damage degree of the blade.
Preferably, the driver is electrically connected to the detection circuit. When the detection circuit detects reverse current, the driver is controlled to brake the rotor, so that no-load consumption is reduced.
Compared with the prior art, the invention has the following beneficial effects: when hard foreign matters are encountered in the mowing process, the invention hinders the operation of the output shaft, so that the rotation speed of the output shaft is rapidly reduced, and the working environment is detected in real time according to the torque feedback of the output shaft; under the action of the elastic force of the reset spring, the folded plate is enabled to rotate far away from the first coil, reverse current is generated on the first coil, when the reverse current exceeds a rated value, the reverse current is transmitted to the adjusting electromagnet, the opposite ends of the adjusting electromagnet and the fixed magnet are enabled to be identical-name magnetic poles, splines at the end part of the input shaft slide out of the key grooves, power is interrupted, the blades are prevented from continuously cutting hard sundries, the broken blades are prevented, meanwhile, reverse torque is prevented from being transmitted to the input shaft, torsion deformation is prevented, and the service life is influenced; the input shaft is subjected to electronic braking through the driver, the power output is cut off, the output shaft is subjected to auxiliary braking through the braking electromagnet, the inertial output is reduced, and the service life of the motor is prolonged through double braking; when current is generated on the regulating circuit, namely the centrifugal speed of the folded plate is too high and exceeds the normal working rotating speed, the relative current on the regulating circuit is monitored, so that the driver is controlled to reduce the speed of the rotor, the no-load power consumption is reduced, and the mowing time is prolonged; when the output shaft drives the fixed magnet to move downwards, the upper end of the braking electromagnet and the opposite end of the fixed magnet are homonymous magnetic poles, the descending speed of the fixed magnet is reduced through the repulsive force of the magnetic poles, when the fixed magnet passes through the middle layer, the lower end of the braking electromagnet and the opposite end of the fixed magnet are heteronymous magnetic poles, the speed of the fixed magnet far away from the braking electromagnet is reduced under the action of the attractive force of the magnetic poles, so that secondary braking is performed, auxiliary speed reduction is performed on the output shaft through the braking electromagnet, the speed reduction efficiency of the output shaft is improved through double-stage braking, and the damage degree of a blade is reduced; and the heat dissipation performance in a high-load state is improved through heat dissipation of the tail end fan.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic general construction of the present invention;
FIG. 2 is a schematic power transfer diagram of the present invention;
FIG. 3 is an enlarged view of part A of the view of FIG. 2;
FIG. 4 is a H-H cross-sectional view of the view of FIG. 3;
FIG. 5 is an L-L cross-sectional view of the view of FIG. 3;
FIG. 6 is an enlarged view of part B of the view of FIG. 2;
in the figure: 1-casing, 11-end cover, 111-detection chamber, 112-adjustment groove, 12-casing, 121-working chamber, 122-transmission groove, 2-power unit, 21-stator, 22-rotor, 23-driver, 24-transmission shaft, 241-input shaft, 242-output shaft, 2421-stop groove, 2422-keyway, 25-auxiliary cooling shaft, 3-adjustment device, 31-detection component, 311-centrifugal disk, 3111-rotary groove, 3112-installation groove, 312-first coil, 313-return spring, 314-flap, 315-second coil, 32-auxiliary cooling component, 321-fan, 3211-clamping groove, 322-clamping block, 323-pretension spring, 33-adjustment electromagnet, 34-fixed magnet, 35-brake electromagnet, 4-housing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides the technical scheme that:
as shown in fig. 1 to 6, a brushless dc motor for a mower with startup protection includes a housing 1, a power unit 2 and an adjusting device 3, wherein the housing 1 is connected with the power unit 2, the power unit 2 is connected with the adjusting device 3 in a transmission manner, the adjusting device 3 is movably connected with the housing 1, the housing 1 includes a housing 12, a working cavity 121 is provided on the housing 12, the power unit 2 includes a stator 21 and a rotor 22, the stator 21 and the rotor 22 are respectively arranged on an outer layer and an inner layer of the working cavity 121, and a transmission shaft 24 is provided at one end of the rotor 22.
The casing 1 is a main installation foundation, power input is carried out through the power device 2, power adjustment is carried out through the adjusting device 3, thereby the mower is protected, damage after the blade is prevented from impacting hard objects is avoided, a main rotation space is provided by the working cavity 121 in the casing 12, a plurality of windings are arranged on the stator 21, the stator 21 is positioned on the outer ring of the rotor 22, the rotor 22 is driven to rotate through the coil windings on the stator 21, displacement is output outwards through the transmission shaft 24, and therefore the blade of the mower is driven to operate, and mowing operation is carried out.
Further, an end cover 11 is arranged on one side of the shell 12, one end of the transmission shaft 24 penetrates through the end cover 11, the power device 2 further comprises a driver 23, the driver 23 is fixedly connected with the shell 12, the driver 23 is electrically connected with the stator 21, the adjusting device 3 is in transmission connection with the transmission shaft 24, the adjusting device 3 comprises a detecting component 31, an adjusting electromagnet 33 and a fixed magnet 34, the detecting component 31 comprises a centrifugal disc 311, a first coil 312, a reset spring 313 and a folded plate 314, the centrifugal disc 311 is sleeved on the outer ring of the transmission shaft 24, the centrifugal disc 311 is in transmission connection with the transmission shaft 24, a detecting cavity 111 is arranged on the end cover 11, the centrifugal disc 311 is arranged in the detecting cavity 111, a rotary groove 3111 is arranged on the centrifugal disc 311, the folded plate 314 is in rotary connection with the rotary groove 3111, the flap 314 one side is equipped with reset spring 313, reset spring 313 keeps away from flap 314 one end and changes groove 3111 fastening connection, change groove 3111 keeps away from reset spring 313 one side and is equipped with mounting groove 3112, first coil 312 is arranged in mounting groove 3112, first coil 312 and flap 314 constitute detection circuitry, flap 314 is the magnet material, transmission shaft 24 includes input shaft 241 and output shaft 242, input shaft 241 and output shaft 242 intermittent type transmission are connected, be equipped with adjustment tank 112 on the end cover 11, input shaft 241 and output shaft 242 junction is located adjustment tank 112, input shaft 241 one side is equipped with adjusting electromagnet 33, output shaft 242 one side is equipped with fixed magnet 34, adjusting electromagnet 33 and fixed magnet 34 are arranged in opposite directions, adjusting electromagnet 33 and detection circuitry electricity link.
The output voltage is controlled through the driver 23 so as to control the output rotating speed of the rotor 22, the single-side opening of the working cavity 121 is arranged, the end cover 11 is used for plugging, the transmission shaft 24 is supported on the end cover 11 through a bearing, the detection component 31 is used for carrying out torsion force feedback detection, when the output torque of the transmission shaft 24 is blocked, the instantaneous rotating speed is reduced, the centrifugal disc 311 is sleeved on the transmission shaft 24, the folded plate 314 on the centrifugal disc 311 is centrifuged in the rotating groove 3111 through the rotation of the transmission shaft 24, the folded plate 314 is rotated against the elastic force of the return spring 313 under the action of the centrifugal force, the folded plate 314 is inserted into the first coil 312, when the operation of the blade is blocked, the rotating speed of the transmission shaft 24 is reduced, the centrifugal force of the folded plate 314 is reduced under the elastic force of the return spring 313, the folded plate 314 is reversely rotated, the first coil 312 is subjected to cutting magnetic induction line motion, the detection current is generated, the magnetic pole magnetism of the regulating electromagnet 33 is changed through the detection current, the opposite ends of the regulating electromagnet 33 and the fixed magnet 34 are kept to attract or repel each other, and the output shaft 242 is driven to move along the input shaft 241 through the transmission, so that the power transmission and interruption is controlled, and the operation safety of the mower is improved.
Further, one end of the input shaft 241 is in transmission connection with the rotor 22, a spline is arranged at one end of the input shaft 241 far away from the rotor 22, a spline groove 2422 is arranged on the output shaft 242, the spline is in intermittent contact with the spline groove 2422, and a stop groove 2421 is arranged at one side of the spline groove 2422 close to the input shaft 241;
when in transmission: opposite ends of the fixed magnet 34 and the adjusting electromagnet 33 are of different-name magnetic poles, a spline of the input shaft 241 is inserted into the key groove 2422, and the input shaft 241 is in transmission connection with the output shaft 242;
cut-off time: the fixed magnet 34 and the adjusting electromagnet 33 have the same magnetic poles at opposite ends, and the spline of the input shaft 241 is inserted into the cut-off groove 2421, and the input shaft 241 is slidably connected with the output shaft 242.
When the motor is started, torque is output through the rotor 22, so that the input shaft 241 is driven to rotate, the input shaft 241 drives the folded plate 314 on the centrifugal disc 311 to centrifuge, the folded plate 314 rotates towards the first coil 312, forward current is generated, the first coil 312 is conducted with the adjusting electromagnet 33, opposite ends of the adjusting electromagnet 33 and the fixed magnet 34 are provided with different-name magnetic poles, under the action of magnetic pole suction force, the fixed magnet 34 drives the output shaft 242 to move towards the input shaft, so that a spline on the input shaft 241 is inserted into a key groove 2422 of the output shaft 242, the key groove 2422 is used for clamping, the input shaft 241 drives the output shaft 242 to rotate, and an external blade is driven to operate, so that mowing operation is performed; when hard foreign matters are encountered in the mowing process, the operation of the output shaft 242 is blocked, the rotation speed of the output shaft 242 is rapidly reduced, the rotation speed of the input shaft 241 is driven to be reduced, the centrifugal force borne by the folded plate 314 on the centrifugal disc 311 is smaller than the elastic force of the reset spring 313, the folded plate 314 rotates far away from the first coil 312 under the action of the elastic force of the reset spring, reverse current is generated on the first coil 312, when the reverse current exceeds a rated value, the reverse current is conveyed to the regulating electromagnet 33, the opposite ends of the regulating electromagnet 33 and the fixed magnet 34 are in the same-name magnetic poles, under the action of magnetic pole repulsive force, the input shaft 241 is axially limited, the output shaft 242 is moved outwards, the spline at the end part of the input shaft 241 slides out of the key groove 2422, the power is interrupted, the continuous cutting of the hard foreign matters by a blade is prevented, the broken blade is prevented, and meanwhile, the reverse torque is prevented from being conveyed to the input shaft 241, and the torsion deformation is avoided, and the service life is influenced.
Further, the centrifugal disc 311 is sleeved on the outer ring of the input shaft 241, the detecting assembly 31 further includes a second coil 315, the second coil 315 is located on one side, away from the folded plate 314, of the mounting groove 3112, and the second coil 315 and the folded plate 314 form an adjusting circuit, and the adjusting circuit is electrically connected with the driver 23.
When current is generated on the regulating circuit, namely the centrifugal speed of the folded plate 314 is too high and exceeds the normal working rotating speed, the relative current on the regulating circuit is monitored, so that the driver 23 is controlled to reduce the speed of the rotor 22, the idle power consumption is reduced, and the mowing time is prolonged.
Further, adjusting device 3 still includes assisting cold subassembly 32, rotor 22 keeps away from transmission shaft 24 one end and is equipped with assisting cold axle 25, be equipped with drive groove 122 on the casing 12, it inserts in drive groove 122 to assist cold axle 25 one end, assisting cold subassembly 32 includes fan 321 and fixture block 322, in fan 321 input inserts drive groove 122, it is equipped with a plurality of fixture blocks 322 along the circumference to assist cold axle 25, be equipped with the air intake on the casing 12, fan 321 is towards the air intake, be equipped with a plurality of draw-in grooves 3211 on the fan 321, fixture block 322 and the intermittent type joint of draw-in groove 3211.
Through assisting cold subassembly 32 and carrying out the auxiliary cooling, support rotor 22 through assisting cold axle 25, when the motor carries out high-speed operation in-process, rotor 22 rotational speed is higher, thereby drive the fixture block 322 on assisting cold axle 25 and carry out the centrifugation, make fixture block 322 carry out the dead axle along assisting cold axle 25 at centrifugal force effort and rotate, fixture block 322 tip joint is in the draw-in groove 3211 of fan, make assisting cold axle 25 to pass through fixture block 322 and fan 321 and carry out the transmission, high-speed self-cooling performance is improved, avoid empty load, simultaneously carry out the deceleration to rotor 22 through the air resistance in the rotatory in-process of fan 321, avoid the blade to move too soon to influence the mowing performance.
Preferably, a pre-tightening spring 323 is arranged on one side of the clamping block 322, and the pre-tightening spring 323 is located at the rear end of the rotation stroke relative to the clamping block 322. When restarting, the rotor 22 is controlled to rotate reversely by the driver 23, so that the clamping block 322 is separated from the clamping groove 3211, and the clamping block is reset under the action of the pre-tightening spring 323, thereby facilitating the detection again.
Preferably, the outer side of the fan 321 is provided with a housing 4, and a plurality of wind eyes are arranged on the housing 4. The air is filtered through the air holes on the housing 4 to prevent impurities from entering the working chamber 121.
As an optimization, the adjusting device 3 further comprises a brake electromagnet 35, wherein the brake electromagnet 35 is electrically connected with the detection circuit, and the brake electromagnet 35 is arranged at one side of the adjusting groove 112;
when the fixed magnet 34 descends, the upper end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are the same-name magnetic poles, and the lower end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are different-name magnetic poles. The diode is arranged on the connecting circuit of the detection circuit and the brake electromagnet 35, the forward current is cut off through the diode, the reverse current is conducted, when braking is carried out, the output shaft 242 drives the fixed magnet 34 to move downwards, the upper end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are homonymous magnetic poles, the descending speed of the fixed magnet 34 is reduced through magnetic pole repulsive force, when the brake electromagnet passes through the middle layer, the lower end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are heteronymous magnetic poles, under the action of magnetic pole attractive force, the speed of the fixed magnet 34 far away from the brake electromagnet 35 is reduced, secondary braking is carried out, auxiliary speed reduction is carried out on the output shaft 242 through the brake electromagnet 35, the speed reduction efficiency is improved, and the damage degree of a blade is reduced.
Preferably, the driver 23 is electrically connected to the detection circuit. When the detection circuit detects the reverse current, the driver 23 is controlled to brake the rotor 22, so that no-load consumption is reduced.
The working principle of the invention is as follows: when the motor is started, the input shaft 241 drives the folded plate 314 on the centrifugal disc 311 to be centrifuged, the folded plate 314 rotates towards the first coil 312 to generate forward current, the first coil 312 is conducted with the regulating electromagnet 33, the fixed magnet 34 drives the output shaft 242 to move towards the input shaft under the action of magnetic pole attraction force, so that a spline on the input shaft 241 is inserted into a key slot 2422 of the output shaft 242, the input shaft 241 drives the output shaft 242 to rotate, when hard foreign matters are encountered in the mowing process, the operation of the output shaft 242 is blocked, the rotating speed of the output shaft 242 is rapidly reduced, the rotating speed of the input shaft 241 is driven to be reduced, the centrifugal force borne by the folded plate 314 on the centrifugal disc 311 is smaller than the elastic force of the reset spring 313, the folded plate 314 rotates away from the first coil 312 under the elastic force of the reset spring, reverse current is generated on the first coil 312, when the reverse current exceeds the rated value, the reverse current is transmitted to the regulating electromagnet 33, the regulating electromagnet 33 and the opposite ends of the fixed magnet 34 are in the same name, and under the action of magnetic pole repulsive force, the axial direction of the input shaft 241 is limited, the output shaft 242 moves outwards, so that the spline on the end of the input shaft 241 slides outwards, and the spline 242slides outwards from the key slot 2422, so that the power is automatically switched; when current is generated on the regulating circuit, namely the centrifugal speed of the folded plate 314 is too high and exceeds the normal working rotating speed, the relative current on the regulating circuit is monitored, so that the driver 23 is controlled to reduce the speed of the rotor 22; when the fixed magnet 34 descends, the upper end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are the same-name magnetic poles, and the lower end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are different-name magnetic poles. The diode is arranged on the connecting circuit of the detection circuit and the brake electromagnet 35, the forward current is cut off through the diode, the reverse current is conducted, when braking is carried out, the output shaft 242 drives the fixed magnet 34 to move downwards, the upper end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are homonymous magnetic poles, the descending speed of the fixed magnet 34 is reduced through magnetic pole repulsive force, when the brake electromagnet passes through the middle layer, the lower end of the brake electromagnet 35 and the opposite end of the fixed magnet 34 are heteronymous magnetic poles, under the action of magnetic pole attractive force, the speed of the fixed magnet 34 far away from the brake electromagnet 35 is reduced, secondary braking is carried out, auxiliary speed reduction is carried out on the output shaft 242 through the brake electromagnet 35, the speed reduction efficiency is improved, and the damage degree of a blade is reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A direct current brushless motor for lawn mower with startup protection is characterized in that: the direct current brushless motor for the mower comprises a machine shell (1), a power device (2) and an adjusting device (3), wherein the machine shell (1) is connected with the power device (2), the power device (2) is in transmission connection with the adjusting device (3), the adjusting device (3) is movably connected with the machine shell (1), the machine shell (1) comprises a shell (12), a working cavity (121) is formed in the shell (12), the power device (2) comprises a stator (21) and a rotor (22), the stator (21) and the rotor (22) are respectively arranged on the outer layer and the inner layer of the working cavity (121), and a transmission shaft (24) is arranged at one end of the rotor (22);
the utility model discloses a centrifugal force detection device, including casing (12), power device (2), power device (24) one end is passed end cover (11), power device (2) still include driver (23), driver (23) and casing (12) fastening connection, driver (23) and stator (21) electricity are connected, adjusting device (3) and transmission shaft (24) transmission are connected, adjusting device (3) are including detection subassembly (31), regulating electromagnet (33) and fixed magnet (34), detection subassembly (31) are including centrifugal disk (311), first coil (312), reset spring (313) and folded plate (314), centrifugal disk (311) cover is established at transmission shaft (24) outer lane, centrifugal disk (311) and transmission shaft (24) transmission are connected, be equipped with detection chamber (111) on end cover (11), centrifugal disk (311) are arranged in detecting chamber (111), are equipped with rotary groove (3111) on centrifugal disk (311), folded plate (314) and rotary groove (3111) rotate and are connected, folded plate (314) one side is equipped with reset spring (313), reset spring (313) and folded plate (314) are kept away from fastening connection one end (3111), the rotary groove (3111) is far away from the reset spring (313) one side and is provided with a mounting groove (3112), the first coil (312) is arranged in the mounting groove (3112), the first coil (312) and the folded plate (314) form a detection circuit, the folded plate (314) is made of a magnet material, the transmission shaft (24) comprises an input shaft (241) and an output shaft (242), the input shaft (241) and the output shaft (242) are in intermittent transmission connection, the end cover (11) is provided with an adjusting groove (112), the joint of the input shaft (241) and the output shaft (242) is positioned in the adjusting groove (112), one side of the input shaft (241) is provided with an adjusting electromagnet (33), one side of the output shaft (242) is provided with a fixed magnet (34), the adjusting electromagnet (33) and the fixed magnet (34) are oppositely arranged, and the adjusting electromagnet (33) is electrically connected with the detection circuit.
One end of the input shaft (241) is in transmission connection with the rotor (22), a spline is arranged at one end, far away from the rotor (22), of the input shaft (241), a key groove (2422) is arranged on the output shaft (242), the spline is in intermittent contact with the key groove (2422), and a stop groove (2421) is arranged at one side, close to the input shaft (241), of the key groove (2422);
when in transmission: opposite ends of the fixed magnet (34) and the adjusting electromagnet (33) are different-name magnetic poles, a spline of the input shaft (241) is inserted into the key groove (2422), and the input shaft (241) is in transmission connection with the output shaft (242);
cut-off time: the opposite ends of the fixed magnet (34) and the adjusting electromagnet (33) are homonymous magnetic poles, a spline of the input shaft (241) is inserted into the stop groove (2421), and the input shaft (241) is in sliding connection with the output shaft (242).
2. A brushless dc motor for a lawn mower with startup protection as claimed in claim 1, wherein: the centrifugal disc (311) is sleeved on the outer ring of the input shaft (241), the detection assembly (31) further comprises a second coil (315), the second coil (315) is located on one side, away from the folded plate (314), of the installation groove (3112), the second coil (315) and the folded plate (314) form an adjusting circuit, and the adjusting circuit is electrically connected with the driver (23).
3. A brushless dc motor for a lawn mower with startup protection as claimed in claim 2, wherein: the utility model discloses a cold subassembly (32) is assisted to adjusting device (3), rotor (22) are kept away from transmission shaft (24) one end and are equipped with auxiliary cooling axle (25), be equipped with transmission groove (122) on casing (12), auxiliary Leng Zhou (25) one end inserts in transmission groove (122), auxiliary cooling subassembly (32) include fan (321) and fixture block (322), in fan (321) input inserts transmission groove (122), auxiliary Leng Zhou (25) are equipped with a plurality of fixture blocks (322) along the circumference, be equipped with the air intake on casing (12), fan (321) are towards the air intake, be equipped with a plurality of draw-in grooves (3211) on fan (321), fixture block (322) and draw-in groove (3211) intermittent type joint.
4. A brushless dc motor for a mower with startup protection as claimed in claim 3, wherein: one side of the clamping block (322) is provided with a pre-tightening spring (323), and the pre-tightening spring (323) is positioned at the rear end of the rotation stroke relative to the clamping block (322).
5. A brushless dc motor for a lawn mower with startup protection as claimed in claim 4, wherein: the outside of the fan (321) is provided with a housing (4), and the housing (4) is provided with a plurality of air holes.
6. A brushless dc motor for a lawn mower with startup protection as claimed in claim 5, wherein: the adjusting device (3) further comprises a brake electromagnet (35), the brake electromagnet (35) is electrically connected with the detection circuit, and the brake electromagnet (35) is arranged at one side of the adjusting groove (112);
when the fixed magnet (34) descends, the upper end of the brake electromagnet (35) and the opposite end of the fixed magnet (34) are homonymous magnetic poles, and the lower end of the brake electromagnet (35) and the opposite end of the fixed magnet (34) are heteronymous magnetic poles.
7. A brushless dc motor for a lawn mower with startup protection as claimed in claim 6, wherein: the driver (23) is electrically connected to the detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887213.5A CN115173624B (en) | 2022-07-26 | 2022-07-26 | Direct current brushless motor for mower with startup protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887213.5A CN115173624B (en) | 2022-07-26 | 2022-07-26 | Direct current brushless motor for mower with startup protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115173624A CN115173624A (en) | 2022-10-11 |
| CN115173624B true CN115173624B (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210887213.5A Active CN115173624B (en) | 2022-07-26 | 2022-07-26 | Direct current brushless motor for mower with startup protection |
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| CN (1) | CN115173624B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833467B (en) * | 2023-02-14 | 2023-05-02 | 三谷科技(东莞)有限公司 | DC brushless motor with output vibration reduction function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2684446Y (en) * | 2004-02-11 | 2005-03-09 | 无锡罗特电机有限公司 | DC motor having braking function |
| CN102306975A (en) * | 2011-08-11 | 2012-01-04 | 成都瑞迪机械实业有限公司 | Electromagnetic brake with chafing gear |
| CN209659077U (en) * | 2019-04-30 | 2019-11-19 | 青岛天一集团红旗电机有限公司 | A kind of permanent split capacitor motor of cutting machine fast braking |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015221067A1 (en) * | 2015-10-28 | 2017-05-04 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Drive device for adjusting a vehicle part with a magnetic braking device |
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2022
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|---|---|---|---|---|
| CN2684446Y (en) * | 2004-02-11 | 2005-03-09 | 无锡罗特电机有限公司 | DC motor having braking function |
| CN102306975A (en) * | 2011-08-11 | 2012-01-04 | 成都瑞迪机械实业有限公司 | Electromagnetic brake with chafing gear |
| CN209659077U (en) * | 2019-04-30 | 2019-11-19 | 青岛天一集团红旗电机有限公司 | A kind of permanent split capacitor motor of cutting machine fast braking |
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| CN115173624A (en) | 2022-10-11 |
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