JP2013063055A - Electric working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the constitution of an economical electronic control system in a variable speed type electric working machine including a detachable battery unit.SOLUTION: The electric working machine has an electric motor for transmitting power to a working unit, a main switch and an electric motor speed setting device disposed in an operation portion, a driving control portion disposed on a machine frame, a battery unit which supplies power to the driving control portion and can be attached or detached to the machine frame, an electricity supply switch disposed on the power feeder on the battery unit side, and a motor power supply control portion which is disposed in the battery unit and outputs a control signal for controlling the ON-OFF of the power supply switch to the power supply switch. The motor power supply control portion produces a control signal on the basis of a switching condition of the main switch state sent through the signal wires, and the driving control portion controls a driving electric power on the basis of a speed-setting signal from the speed-setting device.

Description

  The present invention relates to an electric working machine that uses the rotational force of an electric motor fed from a battery for tillage work and the like.

  Such an electric work machine controls power supply from the battery to the electric motor by operating operation devices such as an operation lever switch, a main switch, and a speed setting device provided in the control unit. Such an electric working machine is known from Patent Document 1. The walking type electric working machine described in Patent Document 1 includes a tilling rotary that operates by a motor and a battery case that supplies power to the motor. As an operation device for operating the motor, a key switch or a lever is used. A limit switch that is turned ON / OFF is installed. Furthermore, a rotation speed setting dial for the motor is also provided. As an electronic control system for motor control, a charge control board and a discharge control board are provided in the battery case, and a signal control board is provided on the machine body side. The signal control board is connected to a power switch, a limit switch linked to the operation lever, and a rotation speed setting dial. The signal control board has a function of outputting a control signal to the discharge control board based on signals from a power switch, a limit switch, and a rotation speed setting dial. The discharge control board includes an output control circuit, a current detection circuit, a switching circuit, a current smoothing circuit, an overdischarge prevention circuit, and a short circuit prevention circuit, and power for driving the motor based on a control signal from the signal control board. Is supplied to the motor.

  In the walking type electric working machine according to Patent Document 1, all the control circuits for power feeding the motor are incorporated in a discharge control board provided in the battery case, and only the processing of the operation signal from the operation device is provided on the machine body side. The signal control board is divided. That is, the battery case is an intelligent battery pack, and the cost of the battery case itself is high. Such a configuration is not a problem if it is a usage form in which only one battery case is used, but in the case of a usage form in which a plurality of battery cases are prepared for a long time operation, each battery case Wasteful that the discharge control boards provided in the overlap.

JP 2011-93493 A (paragraph number [0010-0063], FIG. 7)

  In view of the above circumstances, an object of the present invention is to provide a configuration of a lean electronic control system in a variable speed electric work machine including a detachable battery unit.

  In order to achieve the above object, an electric working machine according to the present invention includes a work unit supported by a machine body, an electric motor that transmits power to the work unit, and a main switch provided in a control unit supported by the machine body. And a speed setting unit for the electric motor, a drive control unit that is provided in the machine body and supplies driving power to the electric motor based on a set value by the speed setting unit, and a power supply line to the drive control unit via a power supply line A battery unit that can be attached to and detached from the fuselage to be fed, a feed switch provided on the feed line on the battery unit side, and a control signal that is provided on the battery unit and controls opening and closing of the feed switch. A motor power supply control unit that outputs to the switch, the motor power supply control unit of the main switch that is sent through the signal line Generates the control signal based on the switch state, and the driving control unit the adjusting the drive power based on the speed setting signal from the speed setter.

  In this configuration, regarding the electronic control system for the electric motor, the power supply switch for turning on / off the power supply through the power supply line from the battery unit to the electric motor and the motor power supply control unit for controlling the power supply switch are arranged on the battery unit side. Is provided. Further, the motor rotation control function has a drive control unit that supplies power for driving the electric motor by processing the electric power sent through the power supply line based on the set value by the speed setting device. Is provided. As a result, the battery unit is provided only with a power supply control function for the electric motor, and is not provided with a motor rotation control function. Therefore, even if a plurality of battery units are prepared for one electric work machine, the battery unit The useless configuration of the electronic control system is suppressed.

  In a preferred embodiment of the present invention, the control unit is further provided with a sub switch, and the drive control unit is configured to permit the supply of the drive power based on a switch state of the sub switch. Yes. In this configuration, even if power is supplied to the electric motor by operating the main switch, the driving power for driving the electric motor at a predetermined rotation is not supplied depending on the switch state of the sub switch. That is, even when the battery unit is in a state of supplying power to the airframe side, the driving of the electric motor can be controlled by operating the sub switch, so that higher reliability can be obtained.

  As a preferred embodiment of the electric work machine equipped with the control device for an electric work machine according to the present invention, the control unit operated by the operator is composed of a pair of left and right handles, one handle is provided with a main switch, and the other handle When the auxiliary switch is provided, the operation of the main switch and the operation of the auxiliary switch are distributed to the left and right hands of the operator, making it easier for the operator to be aware of the operation procedure.

  Further, in one preferred embodiment, the main switch is a push button switch, and the sub switch is a lever switch that can be operated with a hand holding the handle. As a result, the operator operates the main switch and the sub switch with different operation methods, and the operator's awareness of the operation is improved. Further, when the speed setting device is provided on the handle provided with the main switch and is configured as a lever operation type that can be operated by the hand holding the handle, the operation device is concentrated on the handle, and the operability is improved.

  Further, in one preferred embodiment, the drive control unit is configured to be able to perform forward / reverse drive control of the electric motor, and the speed setter is configured to be able to set the forward rotation speed and the reverse rotation speed of the electric motor. As a result, when a tilling rotor or the like is applied as a work unit, it is possible to move forward and backward with a simple operation, and workability of tilling work is improved.

  Furthermore, in one of the preferred embodiments, the power supply line and the signal line are connected to a common connector unit that is coupled through attachment of the battery unit to the fuselage. With this configuration, it is convenient that the battery unit is mounted on the machine body and the power supply line and the signal line on the battery unit side and the machine body side are connected at the same time. In addition, the use of a connector with a common power supply line and signal line simplifies the routing of the electric wire.

It is a schematic diagram illustrating the basic principle of electric motor power feeding control according to the present invention. It is a perspective view which shows the external appearance of the electric working machine by this invention. It is a side view of an electric working machine. It is a side view of the body part of an electric working machine. It is a side view which shows mounting | wearing of the battery unit to the body of an electrically-driven working machine. It is a front view which shows mounting | wearing of the battery unit to the body of an electrically-driven working machine in a cross section. It is a top view of the speed setting device and main switch which were provided in the handle. It is a functional block diagram of the control electronic system of an electric working machine. It is a flowchart figure which illustrates the flow of electric motor electric power feeding control.

  Prior to describing a specific embodiment of the present invention, the basic principle of electric motor control employed in the electric working machine according to the present invention will be described with reference to FIG. Here, the electric working machine is a walking type, and its control unit is a pair of left and right handles, one handle is provided with a main switch, and the other handle is provided with a sub switch. To do. A speed setter for setting the speed of an electric motor (hereinafter simply referred to as “motor”) is provided on the body of the electric working machine, preferably the handle. The motor transmits rotational power to a work unit configured as a tilling rotor. In the example of FIG. 1, the motor power supply control unit that controls power supply from the battery to the motor is incorporated together with the battery in a battery unit that is removably mounted on the machine body. A drive control unit is provided in the power supply line on the machine body side, and the electric power sent from the battery is controlled and converted into the driving electric power of the motor to control the driving of the motor. In other words, the basic power supply control from the battery to the motor is performed by the motor power supply control unit incorporated in the battery unit, and the power supplied from the battery unit is input and the drive power for driving the motor is output. The final motor drive control is performed by a drive control unit provided in the machine body. In order to perform forward / reverse variable rotation control of the motor, the drive control unit is preferably provided with an inverter control function.

  A power supply switch that creates an open state (power supply state) and a closed state (cut-off state) by a control signal output from the motor power supply control unit is interposed in a power supply line from the battery to the motor. The main switch can be selectively switched between ON and OFF, and an ON state signal is provided to the motor power supply control unit in the battery unit through the signal line when the switch is turned ON. When the motor power supply control unit receives the ON state signal of the main switch, the motor power supply control unit sends a power supply OK control signal for setting the power supply line to the power supply state to the power supply switch. A connector unit is provided between the body of the electric working machine and the battery unit so that connection / disconnection is performed in accordance with attachment / detachment of the battery unit to / from the body. A power supply line and a signal line are connected to the connector unit.

  The sub switch can also be selectively switched between ON and OFF. When switched to ON, an ON state signal is given to the drive control unit, and when switched to OFF, an OFF state signal is given to the drive control unit. The speed setter gives a set speed signal corresponding to the set motor speed to the drive controller.

  If the drive control unit is in a state where power is supplied from the battery through the power supply line, that is, if the main switch is in an ON state, the speed set by the speed setter (here, forward (forward) / reverse (reverse)) Drive power is generated and supplied to the motor so that the motor rotates. However, in the example shown in FIG. 1, since a sub switch is provided, the supply of driving power to the motor is an additional condition that an ON state signal from the sub switch is input. ing.

Hereinafter, a specific embodiment of the present invention will be described by taking an example in which an electric working machine is applied to a walking tiller.
As shown in FIGS. 2 and 3, the walking type tiller (hereinafter simply referred to as a tiller) 1 illustrated in this embodiment has a tiller rotor 2 at the bottom of the body 10, and a posture change by swinging back and forth. A steering handle 3 as a possible steering unit, a motor 5 for transmitting rotational power to the tilling rotor 2, and a battery unit 4 serving as a power source for the motor 5 are provided. The battery unit 4 is mounted on the support frame 14 rising obliquely rearward from the rear part of the body 10 so that the battery unit 4 can be mounted from the upper side and pulled out upward. A handle 4a is provided on the upper surface of the battery unit 4 so as to be easily carried. The steering handle 3 includes an arm-like right handle portion 3A and a left handle portion 3B, and is pivotally connected to a rearward projecting end portion of the support frame 14 on the base end side. Thereby, when not in use, the steering handle 3 can be folded forward. An artificial resin cover 11 covering the entire motor 5 and the lower half of the battery unit 4 forms the upper surface contour of the tiller 1 in a curved shape. The mounting table 100 whose outline is indicated by a two-dot chain line is a box body into which the lower part of the tiller 1 is inserted, and improves the stability and transportability of the tiller 1 when not in use.

  As can be understood from FIG. 4, the airframe 10 is substantially composed of a main frame 15 and a transmission case 17. The main frame 15 creates a motor support surface region for supporting the motor 5 and a battery support surface region for supporting the battery unit 4, and the motor support surface region and the battery support surface region are bent at an angle of about 30 degrees. ing. A swing arm 16 that can swing around a horizontal axis in the transverse direction of the aircraft is attached to the rear end of the main frame 15. The swing arm 16 has a downward posture (shown by a solid line in FIG. 3) and a rearward posture. (Indicated by a two-dot chain line in FIG. 3), a fixing means for fixing the swing arm 16 to the main frame 15 in each posture is provided. This fixing means is simply a lock pin and a lock hole.

  A moving wheel 12 is provided on the free end side of the swing arm 16, and a resistance rod 13 is attached to an intermediate portion of the swing arm 16. The moving wheel 12 is grounded in the downward posture of the swing arm 16, and the resistance bar 13 is grounded in the backward posture of the swing arm 16. The lifting height of the airframe 10 can be changed by changing the attachment position of the resistance rod 13 with respect to the swing arm 16 by the pin connection method.

  The transmission case 17 has a left and right bifurcated structure having a substantially L-shape in side view, in which the worm speed reducer 18 is incorporated, and the motor 5 is bolted to a flange portion formed at the upper end portion thereof. The output shaft of the motor 5 and the input shaft of the worm speed reducer 18 are connected by an intermediate transmission shaft drawn in dotted lines in FIG. 4, and the intermediate transmission shaft extends vertically in the transmission case 17. The output of the worm reducer 18 is transmitted to the drive shaft 20 of the tilling rotor 2 that extends from the lower end of the transmission case 17 to the left and right. A front guard 19 made of a round pipe steel material that extends forward in a loop shape that can be used as a grip portion when carrying the cultivator 1 is bolted to the upper portion of the transmission case 17.

  As shown in FIG. 1, the right handle portion 3A and the left handle portion 3B constituting the steering handle 3 are made of a round pipe material, and grips 3a and 3b are provided in the free end regions thereof. A nut-tightening mechanism with a knob is provided to fasten and fix the steering handle 3 to the support frame 14 by a swinging connection portion 30 between the steering handle 3 and the support frame 14. From this configuration, the steering handle 3 can set the steering handle 3 to an arbitrary posture with respect to the support frame 14 by operating the nut with knob.

  As shown in FIG. 2, a push button switch device 31 and a speed setting lever device 33 are provided immediately on the machine body side of the grip 3b of the right handle portion 3B, and a lever switch device 32 is provided on the machine body side of the grip 3a of the left handle portion 3A. Is provided. The push button switch device 31 incorporates a main switch 81 that is turned ON / OFF by a push operation. The speed setting lever device 33 has a horizontal swing lever, and a volume switch 83 linked to the lever is incorporated as a speed setting device. It is possible to output a speed setting signal for setting the speed of the motor 5 in accordance with the volume switch 83 lever swing angle. The push button switch device 31 and the speed setting lever device 33 have a common housing structure, and the lever of the speed setting lever device 33 protrudes from the back of the haze, and the hand of the speed setting lever device 33 holds the grip 3b. The lever is operable.

  As apparent from FIGS. 4, 5, and 6, in the battery support surface region of the main frame 15, the cover 11 forms a battery housing wall 11 a that creates a box-shaped housing space. The battery unit 4 has a rectangular cross section, and the rectangular cross section has the same or slightly larger area than the rectangular cross section of the storage space created by the battery storage wall 11a. Therefore, the battery unit 4 inserted into the housing space of the battery housing wall 11a is firmly held by the elasticity of the battery housing wall 11a.

  A connector 9 for electrical connection between the battery housing wall 11a and the battery unit 4 is provided. The connector 9 includes a battery side connector portion 9a provided at the center of the bottom surface of the battery unit 4 and a machine body side connector portion 9b provided at the center of the bottom surface of the battery housing wall 11a. Here, the battery-side connector portion 9a has a socket shape and the fuselage-side connector portion 9b has a plug shape, but they may be reversed. Since the battery unit 4 is guided by the battery housing wall 11a so that the center is not accurately shifted by the elasticity of the battery housing wall 11a, the battery unit 4 can be reliably inserted into the housing space with the help of gravity. The side connector portion 9a and the fuselage side connector portion 9b are connected. The battery unit 4 accommodated in the accommodation space is pressed and fixed from above by a clamp-type fixture 14 a provided on the handle support frame 14.

  The connector 9 includes a terminal for a power supply line that supplies power from the battery unit 4 to the motor 5, a terminal for a signal line such as the main switch 81, a ground terminal, and a spare terminal for future use. A plurality of connection terminals each including a pin and a pin socket are provided.

FIG. 7 shows a push button switch device 31 and a speed setting lever device 33 provided near the grip 3b of the right handle portion 3B.
In this push button switch device 31, when the operation unit is pressed while rotating from the stop position, the operation unit is displaced downward in the rotation axis direction to the ON position, and the main switch 81 is turned on. Since the operation unit at the ON position is held by the meshing method, the ON state of the main switch 81 is held. By hitting and pushing the operation part in the pushed state, the operation part is released from meshing and rotated, and further displaced upward to return to the initial position (home position) and the main switch 81 is turned off. That is, the push button switch device 31 is a type that mechanically holds ON.

  The speed setting lever device 33 is incorporated in a common housing with the push button switch device 31, but only the swing lever that is the operation lever protrudes from the rear of the housing. This operation lever is connected to a rotor of a volume switch (rotary switch), and can output a signal corresponding to the swing angle of the operation lever. Since the motor 5 can rotate in the forward and reverse directions, the speed of the motor 5 can be adjusted from the maximum forward rotation speed to the maximum reverse rotation speed of the motor 5 through neutral (neutral) where the motor 5 stops by swinging the operation lever. It is.

Next, the internal structure of the battery unit 4 and the flow of signals for supplying power to the motor 5 and controlling the motor 5 in the body 10 will be described with reference to the functional block diagram of FIG.
The battery unit 4 includes a battery main body 40, a charge / discharge switch unit 41, a controller 42, a power supply unit 43, a power supply line 44 connected to the positive side of the battery main body 40, and a ground wire 45 connected to the negative side of the battery main body 40. Various signal lines 46 and a current switching unit 7 are provided.

  The charge / power supply switch unit 41 includes a power supply switch 41a and a charge switch 41b arranged in series with the power supply line 44, and each is constituted by an FET and a diode as is well known. The power supply switch 41a cuts off the power supply line 44 in the OFF state and connects the power supply line 44 in the ON state to enable power supply from the battery body 40 to the external load. The charging switch 41b enables power from a power adapter (not shown) to be supplied to the battery body 40 via the power supply line 44 during charging.

  The controller 42 is substantially composed of a one-chip microcomputer, and a motor power supply control unit 50 that performs power supply control on the motor 5 and a charge control unit that performs charge control on the battery body 40 by executing hardware and programs. 51 and is produced. The motor power supply control unit 50 turns on the power supply switch 41 a based on the ON state of the main switch 81, and permits power supply from the battery body 40 to the motor 5.

  The power supply unit 43 functions as an internal power supply for the battery unit 4 and supplies power to the controller 42 and the current switching unit 7. The current switching unit 7 allows a weak current to flow through the signal line 46 when the controller 42 is in a sleep state for the purpose of energy saving when the cultivator 1 is not in operation, and when the controller 42 wakes up, a weak current is applied to the signal line. It has the function of flowing a large current.

  The battery side connector portion 9a provided in the battery unit 4 includes a power supply socket 91a as a power supply terminal for the power supply line 44, a first socket 92a that is a battery side terminal for the first signal line 46a, and a second signal. A second socket 93a which is a battery side terminal for the line 46b, a third socket 94a which is a battery side terminal for the third signal line 46c, and a fourth socket 95a which is a battery side terminal for the fourth signal line 46d. A fifth socket 96a, which is a battery side terminal for the fifth signal line (here, ground line) 46e, and a ground socket 97a as a ground terminal for the ground line 45 are provided.

  A fuselage-side connector portion 9b provided on the fuselage 10 side so as to correspond to the battery-side connector portion 9a includes a feed pin 91b corresponding to the feed socket 91a, a first pin 92a corresponding to the first socket 92a, and a second socket. Corresponds to the second pin 93b corresponding to 93a, the third pin 94b corresponding to the third socket 94a, the fourth pin 95b corresponding to the fourth socket 95a, the fifth pin 96b corresponding to the fifth socket 96a, and the earth socket 97a. A ground pin 97b is provided.

  A drive control unit 60 that outputs drive power to the motor 5 is provided on the machine body side. The drive control unit 60 includes an inverter unit 61 and a control management unit 62. A signal line 46 x for a volume switch (speed setting device) 83 and a signal line 46 y for a sub switch 82 are connected to the drive control unit 60, and the volume switch (speed setting device) 83 and the sub switch 82 are connected. The switch state signal from is input. The drive control unit 60 controls the inverter unit 61 so as to output drive power based on a signal from the volume switch 83 when the battery unit 4 is in the power supply permission state and the sub switch 82 is in the ON state. For this reason, the power supply line 44 from the power supply pin 91b and the ground line 45 to the ground pin 97b are connected to the drive control unit 60. In addition, the motor 5 is provided with an overheat switch 84 that is turned off in an overheat state of a predetermined value or more in order to detect overheat of the motor 5, and the overheat switch 84 is connected to the drive control unit 60.

  The drive controller 60 is connected to the first pin 92a and a signal line 46w to inform the battery unit 4 of a control state such as motor rotation or abnormal motor stop (overheating). The second pin 93b and the third pin 94b are common terminals and are connected to the main switch 81 through the signal line 46z. The fifth pin 96b is also connected to the main switch 81 as a ground terminal.

  Next, a motor start routine for realizing special motor drive control performed by the control management unit 62 will be described with reference to the flowchart of FIG. This motor start routine evaluates the signal from the main switch 81 and the signal from the sub switch 82 in time series, and the motor start is suspended by the ON state signal from the sub switch 82 when the main switch 81 is OFF. An ignoring state is set, and even if the main switch 81 is turned on in this ignoring state, the motor start is suspended. This ignored state is canceled by an OFF state signal from the sub switch 82.

  In the motor start routine shown in FIG. 9, a check flag is used as a flag for setting the above-described neglected state. Accordingly, when this power supply routine starts, first, the state of the check flag is checked (# 01). If the check flag is reset (ignoring state is not set), is the power supplied from the battery 40 to the inverter unit 61 by the ON state of the power supply switch 41a controlled based on the ON state of the main switch 81? (In other words, whether the battery unit 4 is in a power supply state) is checked (# 02).

  If it is determined in step # 02 that the battery unit 4 is in a power supply state (# 02 Yes branch), it is checked whether the sub switch 82 is in an ON state (# 03). If the sub switch 82 is in the ON state (# 03 Yes branch), the drive power corresponding to the set value is supplied from the inverter unit 61 to the volume switch (speed setting device) 83 to the motor 5, and the motor 5 starts or rotates. To continue (# 04). If the sub switch 82 is in the OFF state in the check of step # 03 (# 03 No branch), even if the battery unit 4 is in the power supply state, the motor 5 is stopped or stopped (# 05). ). In step # 02, even if the battery unit 4 is in a power supply stop state (# 02 No branch), it is checked whether the sub switch 82 is in an ON state (# 06). (# 06 No branch), the motor 5 is stopped or stopped (# 05).

If the sub switch 82 is ON in the check of step # 06 (# 06 Yes branch), the check flag is set (# 07), and the motor 5 remains stopped (# 10).
Further, if the check flag is set in the check of step # 01 (ignore state is set), it is checked whether or not the sub switch 82 is in the OFF state (# 08), and if the sub switch 82 is in the OFF state. If (# 08 Yes branch), the check flag is reset (cancellation of the ignored state), but the motor 5 remains stopped (# 10). If the sub switch 82 is ON in the check of step # 08 (# 08 No branch), step # 09 is jumped and the check flag is not reset, and the motor 5 is also stopped (# 10).

  As described above, one motor start routine is completed according to the above-described flow. By repeating this motor start routine, the motor drive control of the tiller 1 is performed. In other words, in this motor start routine, if the sub switch 82 is turned on before the main switch 81 is turned on, the neglected state is set, and then the motor 5 is turned on even if the main switch 81 is turned on. It remains stopped. The neglected state once set is not canceled unless the sub switch 82 changes from the ON state to the OFF state again.

[Another embodiment]
[1] The electric working machine is not limited to an electric power tiller in which a working rotor is applied to the working unit 2, but various electric motors such as an electric lawn mower and an electric snowblower can be changed by appropriately changing the working unit. The present invention can be applied to a work machine.
[2] The mechanical structures of the control unit 3 and the airframe 10 are not limited in the present invention, and various forms can be employed.
[3] Various types of switches other than the volume switch can be applied as the speed setting unit 83, and the mounting position thereof may be near the sub switch or may be other than the handle 3.

  The present invention can be applied to various electric working machines equipped with the battery unit 4 and driving the work unit 2 with the motor 5.

1: Electric power tiller (electric working machine)
2: Tillage rotor (work unit)
3: Handle (control section)
3a, 3b: Grip 5: Electric motor 4: Battery unit 9: Connector unit 31: Lever switch device (lever switch)
32: Push button switch device (push button switch)
33: Speed setting lever device 10: Airframe 40: Battery 41a: Power supply switch 42: Controller 44: Power supply line 46: Signal line 50: Motor power supply control unit 51: Charge control unit 60: Drive control unit 61: Inverter unit 62: Control Management unit 81: main switch 82: sub switch 83: volume switch (speed setting device)

Claims (7)

A work unit supported by the machine body, an electric motor that transmits power to the work unit, a main switch provided in a control unit supported by the machine body, a speed setting device for the electric motor, and a machine provided And a drive control unit that supplies driving electric power to the electric motor based on a setting value by the speed setting device, a battery unit that is attachable to and detachable from the machine body that supplies power to the drive control unit via a power supply line, A power supply switch provided on the power supply line on the battery unit side, and a motor power supply control unit that is provided in the battery unit and outputs a control signal to the power supply switch for controlling opening and closing of the power supply switch,
The motor power supply control unit generates the control signal based on a switch state of the main switch sent through a signal line, and the drive control unit generates the drive power based on a speed setting signal from the speed setter. To adjust the electric working machine.   The electric working machine according to claim 1, wherein a sub switch is further provided in the control unit, and the drive control unit permits the supply of the drive power based on a switch state of the sub switch.   The electric working machine according to claim 2, wherein the control unit includes a pair of left and right handles, the main switch is provided on one handle, and the sub switch is provided on the other handle.   4. The electric working machine according to claim 3, wherein the main switch is a push button switch, and the sub switch is a lever switch that can be operated with a hand holding the handle.   The electric working machine according to claim 3 or 4, wherein the speed setting device is provided on a handle provided with the main switch, and is a lever operation type that can be operated by a hand holding the handle.   The said drive control part is comprised so that normal / reverse drive control of the said electric motor can be performed, and the said speed setting device can set the normal rotation speed and reverse rotation speed of the said electric motor. The electric working machine described.   The electric work machine according to any one of claims 1 to 6, wherein the power supply line and the signal line are connected to a common connector unit that is connected through attachment of the battery unit to the machine body.

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