Electric power supply system for electric drive machine, and power supply method using same

Abstract

The present invention provides: an electric power supply system for an electric drive machine such as a pest controller, a crusher, or a cleaner, the system being such that the electric drive machine can receive power from the outside while moving and working in a greenhouse or the like; and a power supply method using same. The present invention comprises: a cable reel which is mounted on one side of the electric drive machine and around which a power cable having a plug connected to an end portion is wound; a plug connector which is rotatably mounted on the other side of the electric drive machine and can pivot the plug from a first position to a second position while rotating; and a connector which is mounted on a traveling path of the electric drive machine and can be electrically connected to an external power source, wherein, in a state in which the electric drive machine is near the connector, the plug can pivot by means of the rotation of the plug connector so as to be connected to the connector, and power from the external power source can be supplied to the electric drive machine as a result of the connection.

Description

Power supply system for electric drive implements, and power supply method

[0001] The present invention relates to a power supply system and a power supply method for an electric drive implement, and more specifically, to a power supply system and a power supply method for an electric drive implement having a structure that allows power to be supplied from an external source while the implement, such as a pest control machine, a shredder, or a vacuum cleaner, is moving while operating in a greenhouse or the like.

[0002] This application is filed claiming priority based on Korean Patent Application 10-2024-0162579 (Title of Invention: Power Supply System and Power Supply Method for Electric Driven Working Machine, Filing Date: Nov. 15, 2024), and all contents described in the application specification and drawings, etc. of the said Korean Patent Application are incorporated into this specification.

[0003] A smart greenhouse is a greenhouse in which temperature, humidity, and sunlight are automatically controlled. Since agricultural operations in these greenhouses are mechanized, automated, and unmanned, labor is reduced and production is increased, leading to their frequent construction recently.

[0004] In the smart greenhouse, crops are planted on one or both sides of the work aisle, and heating and hot water supply pipes are installed along the aisle. Additionally, concrete walkways are constructed at both ends of the work aisle. The heating and hot water supply pipes can also serve as rails for the movement of electric-driven implements.

[0005] Electric-driven implements for greenhouses include sprayers, vacuum cleaners, and shredders; however, engine-driven systems have traditionally been widely used due to the high power requirements for operation. For conveyors, which do not require significant power, rechargeable electric drive systems are utilized.

[0006] Unmanned agricultural robots include pest control robots, cleaning robots, planting robots, leaf removal robots, and harvesting robots. Although these robots adopt a rechargeable electric drive system, they face problems such as high power consumption making long-term operation difficult, heavy weight due to the installation of large-capacity batteries, and excessively high battery costs.

[0007] The electric drive implement moves along the concrete passages of the greenhouse and then enters the crop line to perform work. While moving along the concrete, it does not consume much power because it mainly only travels, but it consumes a lot of power when entering the crop line to perform work.

[0008] In relation to rail-driving moving bodies such as electric drive implements, Korean Registered Patent Publication No. 10-1873902 (registered on June 27, 2018) discloses a surveillance robot that travels along a rail and photographs the front, and a wide-area surveillance system using the same. A power signal having electrical energy for driving the surveillance robot flows through a pair of conductive lines, and this power signal may carry at least one of an image signal representing an image captured by the surveillance robot and a control signal for controlling the surveillance robot.

[0009] However, the method of supplying power by arranging a pair of conductive lines along the rail as described above has the disadvantage that not only is the system configuration complex, but there is also a high risk of electrical safety accidents because the conductive lines are always exposed within the rail.

[0010] The present invention was devised in consideration of the above-mentioned problems, and aims to provide a power supply system and a power supply method for an electric drive implement having a structure in which a cable reel is installed on the electric drive implement and external power can be selectively supplied to the cable reel at the entrance of the cultivated crop line.

[0011] Another objective of the present invention is to provide a power supply system and a power supply method for an electric drive machine having a structure that allows for precise and easy coupling and separation between a plug connected to the end of a cable reel and a connector supplying external power.

[0012] To achieve the above objectives, the power supply system according to the present invention comprises: a cable reel having a power cable wound thereon, installed on one side of an electric drive workpiece and having a plug connected to its end; a plug connector rotatably installed on the other side of the electric drive workpiece and capable of pivoting the plug from a first position to a second position when rotated; and a connector installed on the movement path of the electric drive workpiece and capable of being electrically connected to an external power source.

[0013] With the electric drive work device approaching the connector, the plug pivots and moves to connect to the connector by the rotation of the plug connector, and power from an external power source can be supplied to the electric drive work device through the connection.

[0014] An electromagnet may be disposed on either of the plug and connector, and a magnetic material capable of attaching to the electromagnet by magnetic force may be disposed on the other. When the plug and connector are connected, power is supplied to the electromagnet to prevent separation between the plug and the connector, and the plug and connector may be separated from each other by the movement of an electric drive mechanism while the power supply to the electromagnet is cut off.

[0015] The above electric drive device may further include a connection guide that guides the insertion of a plug by having a circular curved surface inclined such that the inner diameter gradually narrows as it moves inward from the front edge of the connector.

[0016] The plug may have a first electrode and a second electrode formed in a ring shape centered on the first electrode. Additionally, the connector may have an A electrode and a B electrode formed in a ring shape centered on the A electrode. When the plug is coupled to the connector, the first electrode and the A electrode may be electrically connected to each other, and the second electrode and the B electrode may be electrically connected to each other.

[0017] The electromagnet is ring-shaped and may be arranged concentrically with the second electrode on the outside of the second electrode of the plug, and the magnetic body is ring-shaped and may be arranged concentrically with the B electrode on the outside of the B electrode of the connector. When the plug and the connector are connected, power is supplied to the electromagnet from a portable battery mounted on the electric drive machine to prevent separation between the plug and the connector.

[0018] When the electric drive work device is in operation, external power is supplied by the plug being connected to the connector, and when the electric drive work device is moving without performing work, power can be supplied from the mobile battery.

[0019] The end of the plug connector is provided with a through-hole through which a power cable can pass, and when the electric drive mechanism moves while the plug is connected to the connector, the power cable can pass through the through-hole and be released.

[0020] The plug connector is provided with an arm having a fixed length, and the plug connector can rotate in the up and down direction from a first position to a second position. When the plug is in the first position, the arm of the plug connector is horizontal to the ground, and when the plug is in the second position, the arm can be vertical to the ground.

[0021] A power supply method, which is another aspect of the present invention, may include: (a) a step of providing an electric drive workpiece having a cable reel on which a power cable with a plug connected to its end is wound, installed on one side, and a plug connector on the other side that can pivotally move the plug from a first position to a second position when rotated; (b) a step of providing a connector installed on the movement path of the electric drive workpiece and capable of being electrically connected to an external power source; and (c) a step of rotating the plug connector while the electric drive workpiece is approaching the connector to connect the plug to the connector and supplying power from the external power source to the electric drive workpiece through the connection.

[0022] In step (c) above, the plug connector is provided with an arm portion having a predetermined length, and the plug connector is capable of rotating up and down from a first position to a second position. When the plug is in the first position, the arm portion is horizontal to the ground, and when the plug is in the second position, the arm portion may be vertical to the ground.

[0023] In step (c) above, an electromagnet may be placed on either the plug or the connector, and a magnetic material capable of attaching to the electromagnet by magnetic force may be placed on the other. When the plug and the connector are connected, power is supplied to the electromagnet from a mobile battery mounted on the electric drive machine to prevent separation between the plug and the connector, and the plug and the connector may be separated from each other by the movement of the electric drive machine while the power supply to the electromagnet is cut off.

[0024] In step (c) above, when the electric drive work unit performs work, external power is supplied to the electric drive work unit by connecting the plug to the connector, and when the electric drive work unit moves without performing work, power can be supplied to the electric drive work unit from the mobile battery.

[0025] In step (c) above, when the electric drive implement moves only without performing work, it moves through a concrete passage provided within the greenhouse. Then, the work of the electric drive implement is performed while moving along a pipe rail provided between the crop lines within the greenhouse.

[0026] The power supply system and power supply method of an electric drive machine according to the present invention have the following effects.

[0027] First, even if electric-driven implements used inside greenhouses, such as sprayers, vacuum cleaners, and shredders, are converted from the existing engine type to the electric type, they can be operated stably by supplying sufficient power from an external source.

[0028] Second, by minimizing the capacity of the mobile battery mounted on the electric implement, the weight and cost of the electric implement can be reduced. Therefore, when applied to recently developed pest control robots, cleaning robots, planting robots, leaf removal robots, and harvesting robots, various work devices can be easily mounted.

[0029] Third, the connection and disconnection between the plug and the connector can be performed quickly and smoothly through the pivoting motion of the plug connector and the magnetic coupling between the plug and the connector.

[0030] Fourth, even if the initial position is slightly off when the plug is connected to the connector, the plug can be accurately guided to the center of the connector by means of a connection guide and magnetic coupling, thereby increasing contact accuracy.

[0031] FIG. 1 is a side view illustrating a power supply system for an electric drive work machine according to a preferred embodiment of the present invention.

[0032] FIG. 2(a) is a side view illustrating an example in which an electric drive mechanism enters a pipe rail and connects a plug to a connector.

[0033] FIG. 2(b) is a side view illustrating an electric drive machine advancing along a pipe rail with the plug connected to the connector.

[0034] FIG. 3(a) is a front view showing the plug connector of the electric drive workpiece before it is rotated downward.

[0035] FIG. 3(b) is a front view showing the plug connector rotated downward so that the plug and connector are combined.

[0036] FIG. 4 is a perspective view illustrating the configuration of the plug and connector in more detail.

[0037] Figure 5 is a plan view illustrating the cultivated crop line and piping rail in Figure 1.

[0038] FIG. 6 is a perspective view illustrating in detail an example of the connector wiring in FIG. 5.

[0039] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0040] FIG. 1 is a side view illustrating a power supply system for an electric drive work machine according to a preferred embodiment of the present invention.

[0041] Referring to FIG. 1, a power supply system for an electric drive work machine according to a preferred embodiment of the present invention includes a cable reel (12) installed on one side of the electric drive work machine (10), a plug connector (14) rotatably installed on the other side of the electric drive work machine (10), and a connector (20) installed on the movement path of the electric drive work machine (10).

[0042] The electric drive work device (10) may be a robot device capable of performing a predetermined task while driving within a greenhouse. The electric drive work device (10) may be equipped with a main body (11) having a driving means, such as wheels, mounted on its lower part to enable driving along a predetermined path, and a work device (16), such as a robot arm, mounted or loaded on the upper or side of the main body (11). The configuration of the work device (16) can be varied in many ways depending on the use of the electric drive work device (10).

[0043] The cable reel (12) is selectively wound with a power cable (13), for example, winding the power cable (13) when rotating in the forward direction and unwinding it when rotating in the reverse direction. A plug (30) is connected to the end of the power cable (13).

[0044] A plug connector (14) is installed on the other side of an electric drive device (10) so as to be rotatable in the up and down direction. The plug connector (14) may have a pivot shaft (14a) and an arm portion (14b) extending a predetermined length from the pivot shaft (14a).

[0045] The connector (20) is installed on the movement path of the electric drive work device (10) and is electrically connected to an external power source. When the electric drive work device (10) approaches the connector (20), the plug (30) rotates by the rotation of the plug connector (14) to connect to the connector (20), and power from the external power source can be supplied to the electric drive work device (10) through the connection.

[0046] As shown in FIG. 2(a), to connect the plug (30) to the connector (20), the plug connector (14) can pivotally move the plug (30) from a first position (P1 in FIG. 1) to a second position (P2 in FIG. 2) when the plug (30) is in the first position (P1), the arm portion (14b) of the plug connector (14) is horizontal to the ground as shown in FIG. 3(a), and when the plug (30) is in the second position (P2), the arm portion (14b) of the plug connector (14) can be vertical to the ground as shown in FIG. 3(b). Conversely, when disconnecting the plug (30) from the connector (20), the plug connector (14) can pivotally move the plug (30) from the second position (P2) to the first position (P1) by rotating it 90 degrees upward. Such forward / reverse 90-degree rotational motion can be implemented by a predetermined servo motor or cylinder. Of course, the rotational direction of the plug connector (14) is not limited to the up-and-down direction as described above, but can be varied to the left-and-right direction, etc.

[0047] As illustrated in FIG. 2(b), when the electric drive device (10) moves while the plug (30) is connected to the connector (20), the power cable (13) can be unwound by passing through the tip (end) of the arm (14b). To this end, the tip (end) of the arm (14b) of the plug connector (14) may be provided with a through-hole (14c) in the form of a hole or groove through which the power cable (13) can pass. FIG. 3(b) illustrates a configuration in which the through-hole (14c) is preferably configured in the form of a hole, and the arm (14b) of the plug connector (14) can rotate downward while the plug (30) is inserted into the through-hole (14c). For smooth insertion and removal between the connector (20) and the plug (30), it is preferable that the gap (tolerance) between the hole diameter (inner diameter) of the through-hole (14c) and the outer diameter of the insertion part of the plug (30) has a value in the range of 0.01 to 0.02 millimeters (mm). In the gap (tolerance) range of 0.01 to 0.02 millimeters (mm), the plug (30) does not unintentionally come out of the plug connector (14) due to its own weight while the plug connector (14) is rotating downward, and the plug (30) can be smoothly separated from the connector (20) when the plug connector (14) is rotated upward to its original position or when the electric drive work device (10) is moved in the opposite direction of the connector (20) after the plug (30) is connected to the connector (20). That is, if the gap (tolerance) is less than 0.01 millimeters (mm), the plug (30) is not easily detached (separated) from the connector (20) when the plug connector (14) is rotated upward to its original position or when the electric drive work device (10) is moved in the opposite direction of the connector (20), and if the gap (tolerance) exceeds 0.02 millimeters (mm), a problem may occur in which the plug (30) is separated from the plug connector (14) by its own weight while the plug connector (14) is rotated downward.

[0048] After the plug (30) is connected to the connector (20), the power cable (13) can be released as it passes through the penetration part (14c) as the electric drive worker (10) moves for work. Since the electric drive worker (10) moves while the plug (30) is connected to the connector (20) and the power cable (13) passes through the plug connector (14) and is released, external power can be continuously supplied during the movement and work of the electric drive worker (10). After the work on the cultivation line is finished, the electric drive worker (10) returns to the connector (20) and when the end of the plug connector (14) is in close contact with the plug (30), the plug (30) can be inserted back into the penetration part (14c). Afterward, the power supply to the electromagnet (31) below is cut off, and the plug connector (14) is rotated upward to its original position or the electric drive working device (10) moves in the opposite direction of the connector (20), so that the plug (30) can be separated from the connector (20).

[0049] As shown in FIG. 4, an electromagnet (31) is disposed in the plug (30), and a magnetic body (21) made of, for example, iron (Fe) or a ferromagnetic body that can be attached by the magnetic force of the electromagnet (31) may be disposed in the connector (20). According to a variation of the present invention, the positions of the electromagnet (31) and the magnetic body (21) may be interchanged. When the plug (30) and the connector (20) are connected, power is supplied to the electromagnet (31) to prevent separation by coupling the plug (30) and the connector (20) by magnetic force.

[0050] When the power supply to the electromagnet (31) is cut off, the plug (30) and the connector (20) can be easily separated by moving the electric drive workpiece (10) in the opposite direction of the connector (20).

[0051] Specifically, the plug (30) may have a first electrode (32) and a second electrode (33) formed in a ring shape centered on the first electrode (32). The connector (20) may have an A electrode (22) and a B electrode (23) formed in a ring shape centered on the A electrode (22). When the plug (30) is coupled to the connector (20), the first electrode (32) and the A electrode (22) can be electrically connected (coupled), and the second electrode (33) and the B electrode (23) can be electrically connected (coupled). At this time, the coupling between the plug (30) and the connector (20) can be maintained by the magnetic force acting between the electromagnet (31) and the magnetic body (21).

[0052] Preferably, the electromagnet (31) is ring-shaped and can be arranged concentrically with the second electrode (33) on the outside of the second electrode (33) of the plug (30). Additionally, the magnetic body (21) is ring-shaped and can be arranged concentrically with the B electrode (23) on the outside of the B electrode (23) of the connector (20). When the plug (30) and the connector (20) are connected, power is supplied to the electromagnet (31) from the mobile battery (15) mounted on the electric drive device (10) to prevent separation between the plug (30) and the connector (20).

[0053] The connection guide (24) is provided with a circular curved surface that gradually narrows in diameter as it moves inward from the front edge of the connector (20), thereby guiding the insertion of the plug (30) into the correct position. The connection guide (24) guides the plug (30) accurately to the center of the connector (20) even if the initial position is slightly off when the plug (30) is connected to the connector (20), so that the magnetic body (21) and the electromagnet (31), the first electrode (32) and the A electrode (22), and the second electrode (33) and the B electrode (23) can each make good contact (combination).

[0054] When the electric drive work machine (10) is not performing work and only moves along the concrete passage (1), power for driving the electric drive work machine (10) can be supplied from the mobile battery (15) mounted on the electric drive work machine (10). Meanwhile, when the electric drive work machine (10) is performing work, it can move by entering the pipe rail (2) which is extended substantially parallel to the line of crops being cultivated inside the greenhouse. The pipe rail (2) is installed at a predetermined height above the ground.

[0055] When the electric drive device (10) enters the pipe rail from the concrete passage (1), it can be operated by receiving external power by connecting a plug (30) to the connector (20) at the entrance. As shown in FIGS. 5 and 6, a power line (3) can be connected to the pair of electrode terminals (25) of the connector (20) placed between each cultivated crop line. As shown in FIG. 6, the pair of electrode terminals (25) can be installed on each side of the connector (20) and electrically connected to each other. The pair of electrode terminals (25) is electrically connected to the A electrode (22) and the B electrode (23) provided in the connector (20). According to this configuration, the power line (3) connection work for each connector (20) can be done conveniently and space utilization efficiency can be increased.

[0056]

[0057] Hereinafter, a method for supplying power to an electric drive work machine according to a preferred embodiment of the present invention will be described.

[0058] A power supply method for an electric drive work device according to a preferred embodiment of the present invention may include the steps of preparing (providing) an electric drive work device (10) having a plug connector (14) installed therein, preparing (providing) a connector (20) electrically connected to an external power source, and connecting a plug (30) to the connector (20) to supply the external power source to the electric drive work device (10).

[0059] The step of providing an electric drive work device (10) may be provided by installing a cable reel (12) on one side on which a power cable (13) with a plug (30) connected to the end is wound, and installing a plug connector (14) rotatably on the other side. The plug connector (14) must be able to pivotally move the plug (30) from a first position (P1) to a second position (P2). When the plug (30) is in the first position (P1), the arm portion (14b) of the plug connector (14) may be horizontal to the ground, and when the plug (30) is in the second position (P2), the arm portion (14b) of the plug connector (14) may be vertical to the ground.

[0060] The connector (20) is installed on the movement path of the electric drive implement (10) and is electrically connected to an external power source. Preferably, the connector (20) can be placed at the entrance between the lines of cultivated crops within the greenhouse.

[0061] The step of supplying external power to the electric drive work device (10) is such that when the electric drive work device (10) enters the pipe rail and approaches the connector (20), the plug connector (14) rotates and the plug (30) preferably rotates 90 degrees so that it can be connected to the connector (20). Through the above connection, power from the external power can be supplied to the electric drive work device (10).

[0062] A sensor (not shown in the drawing) for detecting an electric drive work device (10) is installed at the beginning of the pipe rail, and when this sensor detects the electric drive work device (10), the control unit of the electric drive work device (10) can rotate the plug connector (14) downward.

[0063] Even if the initial position is slightly misaligned when connecting the plug (30) and the connector (20), the plug (30) can be accurately guided to the center of the connector (20) by means of the magnetic coupling between the plug (30) and the connection guide (24) provided in the connector (20) described above, thereby increasing the contact accuracy. Due to the guiding function of the connection guide (24) and the magnetic coupling method between the plug (30) and the connector (20), the operation of connecting the plug (30) to the connector (20) by rotating the plug connector (14) can be performed smoothly.

[0064] In the greenhouse, the operation of the electric drive implement (10) is performed while moving along the pipe rail, and no operation is performed when traveling on the concrete passage (1). Therefore, as the electric drive implement (10) enters the pipe rail, a connection is made between the plug (30) and the connector (20), and an external power source (e.g., commercial single-phase AC power) is supplied to the electric drive implement (10).

[0065] And, when the electric drive work device (10) does not perform work and only moves along the concrete passage (1), the mobile battery (15) supplies power.

[0066] As described above, as external power is efficiently supplied to the electric drive implement (10), the capacity of the mobile battery (15) mounted on the electric drive implement (10) can be minimized, thereby reducing the weight and cost of the electric drive implement (10). Therefore, when the present invention is applied to pest control robots, cleaning robots, planting robots, leaf removal robots, harvesting robots, etc., which are being newly developed recently, various work devices (16) can be mounted more easily.

[0067] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations within the scope of the technical concept of the present invention are possible by those skilled in the art to which the present invention belongs.

Claims

1. A cable reel having a power cable wound thereon, installed on an electric drive machine and having a plug connected at the end; A plug connector rotatably installed on an electric drive workpiece and capable of pivoting the plug from a first position to a second position upon rotation; and Includes a connector installed on the movement path of an electric drive machine and electrically connected to an external power source; A power supply system for an electric drive workpiece, characterized in that, while the electric drive workpiece is in close proximity to the connector, the plug pivots and moves to connect to the connector by the rotation of the plug connector, and power from an external power source is supplied to the electric drive workpiece through the connection.

2. In Paragraph 1, An electromagnet is placed in one of the plugs and connectors, and a magnetic material capable of attaching to the electromagnet by magnetic force is placed in the other. When the plug and the connector are connected, power is supplied to the electromagnet to prevent separation between the plug and the connector, and A power supply system for an electric drive workpiece, characterized in that the plug and the connector are separated from each other by the movement of the electric drive workpiece while the power supply to the electromagnet is cut off.

3. In Paragraph 2, A power supply system for an electric drive machine, further comprising a connection guide that guides the insertion of a plug by having a circular curved surface inclined such that the inner diameter gradually narrows as it goes inward from the front edge of the connector.

4. In Paragraph 2, The plug comprises a first electrode and a second electrode formed in a ring shape centered on the first electrode, and The connector is equipped with an A electrode and a B electrode formed in a ring shape centered on the A electrode, and A power supply system for an electric drive machine characterized in that when a plug is coupled to a connector, the first electrode and electrode A are electrically connected to each other, and the second electrode and electrode B are electrically connected to each other.

5. In Paragraph 4, The electromagnet is ring-shaped and is arranged concentrically with the second electrode on the outside of the second electrode, and The above magnetic body is ring-shaped and is arranged concentrically with the B electrode on the outside of the B electrode, and A power supply system for an electric drive work machine characterized by supplying power to the electromagnet from a mobile battery mounted on the electric drive work machine when the plug and connector are connected, thereby preventing separation between the plug and the connector.

6. In Paragraph 5, When operating an electric drive implement, external power is supplied by connecting the plug to the connector, and A power supply system for an electric drive implement characterized by supplying power from a mobile battery when the electric drive implement is moving without performing work.

7. In Paragraph 1, The end portion of the above-mentioned plug connector is provided with a through-hole capable of passing the power cable, and A power supply system for an electric drive workpiece, characterized in that when the electric drive workpiece moves while the above plug is connected to the connector, the power cable passes through the penetration part and is unwound.

8. In Paragraph 1, The above plug connector is equipped with an arm portion having a fixed length, and The arm can rotate vertically between the first position and the second position, and When the above plug is in the first position, the arm is horizontal with respect to the ground, and A power supply system for an electric drive machine characterized in that the arm is perpendicular to the ground when the plug is in the second position.

9. (a) A step of providing an electric drive working device equipped with a cable reel having a power cable wound thereon with a plug connected to the end portion, and a plug connector capable of pivoting the plug from a first position to a second position when rotated; (b) a step of providing a connector installed on the movement path of an electric drive machine and electrically connected to an external power source; and (c) a step of rotating a plug connector while the electric drive workpiece is in a state where it is approaching a connector to connect the plug to the connector and supplying power from an external power source to the electric drive workpiece through the connection; a method for supplying power to an electric drive workpiece.

10. In paragraph 9, the above step (c) is, The above plug connector is equipped with an arm portion having a fixed length, and The arm part is capable of vertical rotation from the first position to the second position, and When the above plug is in the first position, the arm is horizontal with respect to the ground, and A method for supplying power to an electric drive machine, characterized in that the arm portion is perpendicular to the ground when the plug is in the second position.

11. In paragraph 10, the above step (c) is, An electromagnet is disposed in one of the above plugs and connectors, and a magnetic material capable of attaching to the electromagnet by magnetic force is disposed in the other. When the plug and connector are connected, power is supplied to the electromagnet from the mobile battery mounted on the electric drive machine to prevent separation between the plug and the connector, and A method for supplying power to an electric drive workpiece, characterized in that the plug and connector are separated from each other by the movement of the electric drive workpiece while the power supply to the electromagnet is cut off.

12. In paragraph 11, the above step (c) is, When the above electric drive implement only moves without performing work, power is supplied from the above mobile battery, and A method for supplying power to an electric drive work machine, characterized in that when the electric drive work machine is in operation, the plug is connected to the connector to supply power from an external power source.

13. In Clause 12, the above step (c) is, When the above-mentioned electric drive implement only moves without performing work, it moves through a concrete passage provided inside the greenhouse, and A method for supplying power to an electric drive implement, characterized by moving through a pipe rail provided between the lines of cultivated crops within a greenhouse during operation of the electric drive implement.

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