KR20050120123A - Electric motor characteristic cating machine or afpm bldc - Google Patents

Abstract

The present invention uses an AFPM (Axial-Flux Permanent Magnet) brushless direct current (BLDC) type motor as a drive unit, and the rolling type safety cutter is integrally fastened to the rotor outer cover of the drive unit motor, and the stator of the drive unit motor. A wheel (roller) is attached to one end of the shaft of the stator, and a control (inverter) switch for controlling the rotational force (RPM) of the motor is mounted on one end of the working rod that supports the driving part and is used as the working rod. It relates to an electric mower using the characteristics of the finished AFPM BLDC motor.

Description

Electric motor characteristic cating machine or AFPM BLDC using AFPM BLDC motor characteristics

The mowing device is a widely used device for removing weeds such as farms, fields, orchards, or for ancestor oxygen or lawn or gardening.

Types of mowers are engine mowers, which operate by consuming oil mixed with gasoline and lubricating oil in small proportions, and electric mowers, which operate with electromagnetic force with a small battery as an energy source and a motor as a drive unit. Divided. As the engine mower burns gasoline while the engine is running, the smoke generated during the combustion process generates a lot of substances that are harmful to the human body, and high oil prices are generated due to finite exhaustion of petroleum resources. In addition, the commercially available electric mowing machine adopts the constant speed rotation method in which the motor is driven at the highest speed by the ON / OFF of the one-touch switch, and it has a closed end that consumes the energy of a small battery rapidly. Recharge is inevitable inconvenience. In addition, the above-mentioned conventional mowing machine does not have a device to measure the working distance and height subjectively, so the work can be performed as a guesswork, and the user's small periphery also causes the blade to hit the ground, resulting in a large amount of scattering debris. There was a risk of injury from an accident.

The present invention devised to compensate for the above-mentioned disadvantages of the conventional electric harvester, the existing electric harvester driving unit is composed of a general radial motor and is a structure that rotates at a constant speed ON / OFF of the one-touch switch. However, the AFPM (Axial-Flux Permanent Magnet) BLDC (Brushless Direct Current) drive motor of the present invention can easily change the role of the rotor and the stator, and the disc and the rotor and the stator have an ultra slim type. Since the wheel can be installed at one end of the shaft of the stator, and the rolling safety cutter can be installed on the outer cover of the rotor, it is constructed in one piece. In addition, the AFPM BLDC motor has a structure in which the rotation speed (RPM) can be easily adjusted by a controller (inverter), and thus the ON / OFF switch of the present invention is configured to facilitate low speed, medium speed, and high speed control, thereby efficiently using battery energy. It is possible to extend the use time per charge. The electric mower of the present invention having the structure as described above, the rolling cutter against the scattering fragments generated by the collision with the foreign matter during the mowing operation, the rolling repulsion force is naturally absorbed by the rolling repulsion force into the circular line of the outer cover of the motor drive rotor (Rotor) The complete rotation will protect the mowing equipment and ensure operator safety. In addition, the pull-out worker grabbed the work rod with both hands, and had no choice but to approach the cutter part by approximating the working distance and working height with the weedy ground, but one side of the shaft of the stator of the motor of the drive unit of the present invention. It is a feature of the present invention that the wheel is freely attached to the end, so that the work distance and height can be controlled subjectively, and thus the elderly or the beginner using the mowing machine is configured to facilitate the mowing operation.

In the electric mowing machine using the characteristics of the present invention, an AFPM (Axial-Flux Permanent Magnet) BLDC (Brushless Direct Current) motor, as shown in Fig. 1, the external shape of the slim disk type and the stator of FIG. , One end of the shaft (shaft) is connected to the working rod (60 of Fig. 7), and one end is attached to the roller (see Fig. 6) (free wheel) freely moving left and right, and the disk type rotation of Fig. 4 The permanent magnet (PM) is attached to the disc inside the rotor. Since the rotor disc plays the role of a fan, the rotor disc has a suitable structure to remove heat generated by the loss of the motor. Also, a rolling safety cutter (Fig. 10) is placed on the disc-shaped rotor outer disk (see Figs. 5 and 6). The cutter is attached to the outside of the rotor in the form of a three- or four-degree type.

In addition, the AFPM BLDC motor has a brushless structure and is driven by switching a DC input voltage. However, the AFPM BLDC motor is driven by an alternating current (DC) voltage. The rotor (Fig. 4) is disposed around the stator (Fig. 2) of the motor, and a permanent magnet is arranged inside the rotor, and the armature winding is wound on the stator (Fig. 2) side. In general, the motor is driven by the two-phase conduction method of three-phase sequentially to the stator winding. Fig. 11 is a motor drive inverter circuit, which shows a current conduction section sequentially in each phase. AFPM BLDC motor is a device for detecting the position of the rotor instead of the brush and commutator for rectification and the voltage is applied to the armature winding through the inverter according to this position information. Hall sensors, encoders, etc. are used as the position detecting element, and recently, a sensorless BLDC motor is partially used.

Electric mower using AFPM BLDC motor characteristics completed by attaching a control (inverter) (Fig. 11) switch (not shown) to one side of the working rod (see Fig. 9) to control the rotational force (RPM) of the motor with the above structure. to be.

As an embodiment of the present invention having such a configuration, one side end of the shaft (shaft) of the stator (Fig. 2, Fig. 3) of the slim disc type in the motor outline of Fig. 1 is attached to another end of the shaft (Fig. 6). Is connected to the work rod (Fig. 9) and the inverter control switch of Fig. 11 is attached to one end of the work rod, and the permanent magnet is arranged inside the rotor (Fig. 4), which is an outer cover of the stator (Fig. 2), There is a rolling safety cutter (Fig. 11) is a two-degree type, three-degree type or four-degree type by fastening the rotor (Fig. 4) integrally using a fastener, but this embodiment is implemented in the four-degree type Yes. The accessory components include a battery, a charger storage bag and a suspender bag that can carry the battery on the back. When the control switch (not shown) attached to the working rod (Fig. 9) is turned on so that electricity is applied from the battery as an operation method, the external rotor (Fig. 6) of the drive unit motor rotates and is integrally attached to the rotor. Rolling safety cutter (FIG. 10) is unfolded by the rotational centrifugal force mowing operation is executed. At this time, if the rotating blade hits a hard object such as a stone or wood such as a foreign substance, the blade rotates inside the disk-shaped rotor line and hides, causing small damage or scattering of the blade, and stator (Fig. 3) shaft (shaft). ) The roller attached to one end (see Fig. 8) can be rotated left and right in close contact with the ground to perform mowing work.As such a roller device can be attached, the distance and height of mowing work can be measured subjectively. Safety accidents caused by work can be drastically improved. This effect is possible because the AFPM BLDC motor has a reverse role in the rotor and stator of a general radial motor, and various embodiments without departing from the spirit of the present invention are intended to be included in the scope of the present invention. .

As described above, the mower with wheels attached to the stator shaft of the motor drive unit makes it easy to adjust the distance and height from the ground when weeding, etc., so that the cutting part of the rolling cutter has a significant risk of collision with the ground or foreign objects. Improved, invisible obstacles and rolling cutters are inevitable, so the rotating part of the cutter absorbs the collision repelling force and the blade is immediately rotated inside the rotor outer cover circular line of the drive, so the user is injured by flying debris. The risk is significant and the damage to the equipment is prevented, resulting in long service life. It also controls the motor's rotational speed (RPM), reducing unavoidable energy consumption and extending battery life. In addition, since the inertia force of the rotor with the cutter increases, it provides a cutter-type mowing machine with an integrated cutting unit with excellent cutting force even at a low speed, and the ultra slim and light weight of the device is realized, so that the fatigue of the elderly and beginners can be significantly improved. It works.

       1, outline view of AFPM BLDC motor

Figure 2, Stator configuration diagram of the motor

Figure 3, Stator side view

4, rotor configuration

Fig. 5 is a state diagram of driving part stator and working rod binding.

6, the driving part stator and roller and rotor cutter, schematic completion diagram

Figure 7, reference drawing work

8, the ground folded state diagram of the roller portion

9, working rod configuration

Fig. 10, Rolling safety cutter drawing, waveform circular saw blade and waveform mixing drawing from above

11, control inverter control state diagram

Reference numeral 10 in the drawing 7, rotor 60 of the drive unit, work rod 100.

Claims (8)

 In electric mower using AFPM BLDC motor characteristic, AFPM (Axial-Flux Permanent Magnet) BLDC (Brushless Direct Current) type motor (Fig. 1) as a drive unit, Cutter part configured by integrally fastening the rolling type safety cutter (Fig. 10) to the outer cover of the rotor (Fig. 4, Rotor) of the drive unit motor, Roller part rotated by attaching and binding the roller (Fig. 6, wheel) to one end of the shaft (Fig. 2, 3 Stator) of the drive unit motor, Switching control unit that is equipped with a switch (not shown) of the control (inverter Fig. 11) method (Fig. 11) for controlling the rotational force (RPM) of the motor at one end of the working rod (Fig. 9), Electric mop using AFPM BLDC motor characteristics, characterized by a bag of means of transportation that can carry the battery on the back, a charger for charging the battery and a storage bag of the device. The binding means and the stator portion according to claim 1, wherein a magnetic field is wound around the stator (see FIGS. 2 and 3) of the drive unit motor and one end of the shaft (shaft) is coupled to the working rod. According to claim 1, the coupling means and the rotor integral rotor unit in which a permanent magnet is arranged inside the rotor (see Fig. 4) of the drive unit motor and a rolling cutter (Fig. 10) is fastened to the outside of the rotor. The binding means and the roller (wheel) part of Claim 1 which attach and bind the roller (wheel) which rotates back and forth freely right and left to one end of the shaft (shaft) of the stator (FIG. 6) of a drive part motor. The method of claim 1, wherein the control method for adjusting the RPM of the drive motor (see Fig. 11) and the control means for engaging the control switch and the control switch with the working rod. Cutter portion and fastening means according to claim 1 and 3, wherein the blade portion of the rolling cutter (Fig. 10) is composed of a half-moon wave shape, saw blade shape, circle shape, a mixture of wave shape and saw blade. The driving motor, the roller, and the cutter unit are operated by configuring the roles of the stator (Fig. 2, Stator) and the rotor (Fig. 4, Rotor) opposite to each other in the above 1,2,3,4.  Fastening means and the binding means that the roller and the cutter unit is compatible with the cutter rotary end of the engine mower.