JPH1096250A - Battery driven operation machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect induced electromotive force by inertial rotation of a rotor of a motor to charge a battery and to prolong the life of the battery to make it possible to continue work for a long time. SOLUTION: A battery driven operation machinery is equipped with a swiveling motor 3 driven with electric power obtained from a battery 2 to be mounted, an operation member swiveling with the swiveling motor 3 and a control lever 5 for driving and controlling the operation member. Then, the control lever 5 is provided between a neutral position for the operation member to stop operation and an operating position for the operation member to operate in a controllable manner, electric power from the battery 2 is supplied to the swiveling motor 3 by switching the control lever 5 from the neutral position to the operating position, and induced electromotive force from the swiveling motor 3 for making inertial rotation with inertial operation of the operation member is supplied to the battery 2 by switching the control lever 5 from the operating position to the neutral positon to charge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-powered work machine that performs various operations using electric power from a mounted battery.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 4-53846, a battery-driven working machine that obtains electric power from a mounted battery and performs predetermined civil works is known. I have. This work machine drives an electric motor by electric power from a battery, drives a hydraulic pump by driving the electric motor, drives a hydraulic motor by hydraulic oil discharged from the hydraulic pump, and drives a hydraulic excavator or the like by driving the hydraulic motor. The work member is configured to operate.

[0003] Such a battery-operated working machine generates less noise and emits no exhaust gas than an internal combustion engine-based working machine that uses an internal combustion engine such as a gasoline engine or a diesel engine as a drive source. Suitable for work in dense urban area.

[0004]

The above-mentioned conventional battery-driven working machine transmits the driving force of the electric motor to the working member via a hydraulic pump, hydraulic oil, and a hydraulic motor. Therefore, the driving force of the electric motor is attenuated by the driving of the hydraulic pump, the movement of the hydraulic oil in the oil supply pipe, and the driving of the hydraulic motor, and the driving force is not efficiently transmitted to the working members, and the life of the battery is shortened accordingly. Had a point.

In order to solve such a problem, it is conceivable to transmit the electric motor directly to the working member without passing through the hydraulic pump or the hydraulic motor. Although the energy efficiency is improved, the working member usually performs a predetermined work by frequently reciprocating, so that the working member is repeatedly operated and stopped frequently, so that the working member that has once moved can be used immediately. The problem that the energy efficiency is reduced due to the suspension is not solved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to extend the life of a battery by efficiently supplying electric power to a motor and to work for a long time. It is an object to provide a battery-powered work machine that can be continued.

[0007]

According to a first aspect of the present invention, there is provided a battery-operated working machine, comprising: an electric motor driven by obtaining electric power from a mounted battery; and an operation for performing a predetermined operation by driving the electric motor. In a battery-powered work machine comprising a member and an operation lever for operating the operation member, the operation lever is configured to be a neutral position where the operation member stops operating and an operation position where the operation member operates. The operating lever is provided between the neutral position and the operating position to supply electric power from the battery to the electric motor to operate the working member, and to operate the operating lever during the operation of the working member. A drive circuit for charging the battery with induced power from a motor driven by the inertial operation of the working member by switching from The drive circuit is formed including a power supply circuit for supplying electric power from the battery to the electric motor, and a power storage circuit for supplying the induced electric power of the electric motor driven by the inertial operation of the working member to the battery. A switch element that is turned on when the operating lever is located at the operating position and is turned off when the operating lever is located at the neutral position is provided, and the power storage circuit prevents power supply from the battery to the motor, A rectifying element is provided to allow the power supply from the electric motor to the battery.

According to this work machine driven by a battery, by setting the operating lever to the neutral position, the switch element of the power supply circuit is turned off. In this state, the switch element of the power storage circuit is blocked by the rectifying element of the power storage circuit. Is not supplied to the motor, the motor is stopped and the operation of the working member is stopped. Then, the switch element is turned on by operating the operation lever from the neutral position to the operating position, so that electric power from the battery is supplied to the electric motor, the electric motor is driven, and the working member performs a predetermined operation.

When the operating lever once operated to the operating position is returned to the neutral position during the operation of the working member, the switch element is turned off, so that power is not supplied to the electric motor. , The motor is driven by this inertial operation (that is, the rotor of the motor is rotated by inertia), and the induced power generated by the driven of the motor is supplied to the battery through the rectifying element of the storage circuit, whereby the battery is discharged. Charged.

As described above, since the induced power generated by the inertial operation of the working member is collected in the battery, the life of the battery can be extended correspondingly.
One charge from the external power makes it possible to work for a longer time.

[0011] Then, by using a switch element in the power supply circuit, a rectifier element in the power storage circuit, and forming a drive circuit by a combination of the switch element and the rectifier element, power recovery by inertial rotation of the rotor of the motor. Can be simplified.

According to a second aspect of the present invention, there is provided a battery-operated working machine according to the first aspect, wherein the switch element is a transistor, and the rectifying element is a diode. Things.

[0013] According to the battery-powered work machine, the transistor can surely fulfill the function as a switching element, and the diode can surely fulfill the function as a rectifying element. Further, these elements are inexpensive, and the manufacturing cost of the drive circuit is low.

According to a third aspect of the present invention, there is provided a battery-operated work machine according to the second aspect, wherein the transistor is turned on / off at a duty ratio corresponding to an operation amount of an operation lever. Is provided.

According to this battery-powered work machine, electric power having a duty ratio corresponding to the operation amount of the operation lever is supplied to the electric motor by the control signal from the control device in a state where the operation lever is set to the operating position. Therefore, the electric motor rotates at a rotation speed according to the operation amount of the operation lever, whereby the working member operates at a speed according to the operation amount of the operation lever.

The electric motor is supplied with electric power from the battery by application of a pulse voltage formed by turning on and off the switch element. Therefore, when electric power is supplied through a conventional variable resistor, for example, In comparison, there is no inconvenience that power is not efficiently supplied to the motor due to power consumption of the resistor.

[0017]

FIG. 1 is a schematic side view showing an embodiment of a work machine according to the present invention. In this figure, a small excavator is shown as a working machine. The shovel car 1 is provided with a riding section 11 on which an operator rides and performs a driving operation, a crawler 12 for movement provided at the bottom of the riding section 11, and a bendably provided at the front of the riding section 11, and , And a working member 13 that is operated by the drive of the actuator 14. The crawler 12 is provided on both sides (both sides in a direction perpendicular to the paper surface of FIG. 1) of a base 12a that supports the crawler 12, and
Is rotatably supported about a vertical axis 12b erected at the center of the base 12a.

The riding section 11 is mounted on the vertical axis 1 on the base 12a.
A turning motor 3 is provided for turning the work member 13 by turning about 2b. By driving the turning motor 3, the riding section 11 can change the horizontal direction with respect to the crawler 12. ing. Further, the crawler 12 includes a traveling motor 3a provided on a base 12a.
The excavator 1 can move forward, backward and change course.

The working member 13 is connected to a base arm 13a rotatably supported around a horizontal axis 11b at the front end of the riding section 11, and is connected to the distal end of the base arm 13a so as to be free to bend. And a shovel 13 connected to the distal end of the distal arm 13b so as to be freely bent.
c. The actuator 14
Are a proximal actuator 14a for rotating the proximal arm 13a about the horizontal axis 11b and an intermediate actuator 14 for rotating the distal arm 13b about the horizontal axis 11c.
b and a tip actuator 14c for rotating the shovel 13c about the horizontal axis 11d.

On the other hand, a battery 2 is mounted in the riding section 11, and a motor 3b for a hydraulic pump driven by obtaining electric power from the battery 2 and a hydraulic pump driven by the motor 3b for the hydraulic pump 4 are furnished. In the riding section 11 and the base 12a, there are provided a plurality of circulation paths for sending hydraulic pressure generated by driving the hydraulic pump 4 to each of the actuators 14a, 14b, 14c, and a hydraulic oil for each hydraulic system. A plurality of switching valves for switching the direction and stopping the operation oil are provided.

The rear part of the riding section 11 (to the right in FIG. 1)
A driver's seat 15 on which an operator sits and drives the shovel car 1 is provided, and an operation console 16 facing the driver's seat 15 is provided upright in front of the boarding section 11. A plurality of operation levers 5 corresponding to the turning motor 3, the traveling motor 3a, and the actuators 14a, 14b, 14c are provided. By operating these operation levers 5, the excavator car 1 is driven by the turning electric motor 3 to rotate the riding section 11 forward and reverse around the vertical axis 12 b, or by the driving of the traveling electric motor 3 a to rotate the crawler 12. And the actuators 14a, 14a through the hydraulic pump 4 driven by the hydraulic pump motor 3b.
b, 14c, and 11a are driven.

As described above, the drive system of the shovel car 1 is as follows.
As in the system of the turning electric motor 3 and the traveling electric motor 3a, the electric power from the battery 2 is directly transmitted to the operation of the shovel car 1, and in the system of the hydraulic pump electric motor 3b,
The power from the battery 2 is temporarily transmitted to the hydraulic pump 4 by driving the electric motor 3b for the hydraulic pump, and the shovel car 1 is operated by the pressure of the hydraulic oil from the hydraulic pump 4 (the operation of the working member 13). ing. In the present invention, the driving force of the electric motors 3, 3a is directly transmitted to the operation of the shovel car 1 without using a hydraulic pump.

FIG. 2 is a wiring diagram showing one embodiment of a drive circuit (electric system) according to the present invention. In FIG. 2, for simplicity of description, only a system related to the turning electric motor 3 for turning the working member 13 around the vertical axis 12b is shown as a representative among a plurality of electric systems. As shown in this figure, the electric system 6 includes a power supply circuit 7 for supplying the electric power of the battery 2 to the turning motor 3, and a control circuit 8 for controlling the driving of the turning motor 3. .

The power supply circuit 7 includes an anode-side wire 71a connected to the anode of the battery 2 and a cathode-side wire 71b connected to the cathode of the battery 2;
a first parallel wiring 72a and a second parallel wiring 72b having an emitter and a collector connected in parallel between a and 71b;
A first transistor 73a and a fourth transistor 73d in which an emitter and a collector are sequentially connected to the first parallel wiring 72a in series from an anode wiring 71a to a cathode wiring 71b, and an anode wiring is connected to the second parallel wiring 72b. A second transistor 73 in which an emitter and a collector are sequentially connected in series from 71a to a second parallel wiring 72b
b and a third transistor 73c.

The power supply circuit 7 includes a first diode 74a, a second diode 74b, and a third diode 74c.
And a fourth diode 74d.

The first diode 74a includes a first parallel wiring 72a between the first transistor 73a and the fourth transistor 73d, a first wiring 73a in parallel with the first transistor 73a between the anode wirings 71a, and a cathode wiring on the cathode side. 71
a.

The second diode 74b is connected to the second diode 74b.
A second line between the second parallel wiring 72b between the transistor 73b and the third transistor 73c and the anode-side wiring 71a
It is provided in parallel with the transistor 73b and with the cathode side facing the anode side wiring 71a.

The third diode 74c is connected to the second diode 74c.
A third line between the second parallel line 72b between the transistor 73b and the third transistor 73c and the cathode side line 71b
The second transistor is connected in parallel with the transistor 73c,
It is provided toward the parallel wiring 72b.

The fourth diode 74d is connected to the first diode 74d.
A fourth line is provided between the first parallel line 72a between the transistor 73a and the fourth transistor 73d and the cathode side line 71b.
The first transistor is connected in parallel with the transistor 73d and the cathode side is
It is provided toward the parallel wiring 72a.

The first parallel wiring 72a between the first transistor 73a and the fourth transistor 73d and the second
An electric motor wiring 75 is bridged between the transistor 73b and the second parallel wiring 72b between the third transistor 73c, and the turning electric motor 3 is interposed in the electric motor wiring 75. A key switch 70 is provided on the anode side wiring 71a.
Are turned on / off to turn on / off the key switch 70 so that the transistors 73a, 73b, 73c, 73
The electric power of the battery 2 is supplied to the turning electric motor 3 in accordance with the opening / closing state of d, and the turning electric motor 3 is driven forward and reverse. In addition, the drive shaft of the turning electric motor 3 is connected to a transmission 31 formed by combining a plurality of gears and the like,
The riding section 11 rotates forward and backward around the vertical axis 12b via the transmission 31, whereby the working member 13 rotates forward and backward.

The control circuit 8 includes an operation angle sensor 81 for detecting the operation angle (operation amount) of the operation lever 5 and a predetermined control signal based on the detection result of the operation angle sensor 81 to each of the transistors 73a, 73b, 73b. And control means 82 for outputting to 73c and 73d. The detection result of the operation angle sensor 81 is input to the control circuit 8 via the detection signal line 81a.

The operation angle sensor 81 is connected to the operation lever 5.
Is a well-known sensor configured to detect a tilt angle when it falls back and forth with reference to the upright state of the camera. The detection result of this operation angle sensor 81 is output as an analog signal based on a current value via a detection signal line 81a. Is input to the control means 82.

The control means 82 includes an operation angle sensor 81
And a chopper circuit 84 for outputting a pulse signal to each of the transistors 73a, 73b, 73c and 73d. Have.

The power supply control unit 83 includes the operation lever 5
Transistors to be turned on (first to fourth transistors 73a, 73b, 73c, 73d), and outputs a control signal to the chopper circuit 84 so that a predetermined duty ratio can be obtained for the selected transistor.

The chopper circuit 84 outputs the input DC current intermittently at a constant cycle, and outputs a voltage pulse having a pulse width based on a control signal from the power supply control unit 83. It has become. A first pulse signal line 84a is provided between the chopper circuit 84 and the base of the first transistor 73a, and a second pulse signal line 84a is provided between the chopper circuit 84 and the base of the second transistor 73b.
The pulse signal line 84b is wired, the third pulse signal line 84c is wired between the chopper circuit 84 and the base of the third transistor 73c, and the fourth pulse signal line 84c is wired between the chopper circuit 84 and the base of the fourth transistor 73d. Pulse signal line 84
d are wired, and the pulse signals from the power supply control unit 83 are supplied to these pulse signal lines 84a, 84b, 84c, 84
d, predetermined transistors 73a, 73b, 73
c, 73d.

Therefore, the chopper circuit 84 outputs a pulse signal for achieving the above-mentioned duty ratio to the base of the transistor selected by the power supply control unit 83, so that the transistor is turned on and off at a predetermined timing. The turning-off operation is performed, the pulse voltage having the above-described duty ratio is applied to the turning electric motor 3, and electric power according to the operation amount of the operation lever 5 is supplied to the turning electric motor 3. As a result, the turning electric motor 3 is driven at a rotation speed corresponding to the operation amount of the operation lever 5, and the riding section and the working member 13 are driven by the turning electric motor 3 via the transmission 31 in accordance with the operation amount of the operation lever 5. Turn at the speed you chose.

FIG. 3 is a waveform diagram illustrating the relationship between the operation amount of the operation lever 5 and the pulse voltage flowing through the power supply circuit 7. FIG. 3A shows a state in which the operation lever 5 is set to the neutral position. (B) is a state in which the operation lever 5 is operated by 30% of the total operation amount, (c) is a state in which the operation lever 5 is operated by 60% of the total operation amount, and (d) is a state in which the operation lever 5 is operated by the full operation amount. Each state is shown.

First, as shown in FIG. 3A, when the operation lever 5 is set to the neutral position, the operation angle sensor 81 (FIG. 2) detects "0", and this detection signal is output. The power is supplied to the power supply control unit 83 of the control unit 82. When the detection signal is “0”, the power supply control unit 83 sets the transistor 73 (first to fourth transistors 73 a, 73 b, 73
3c and 73d), there is no signal output from the chopper circuit 84 at the base of the transistor 7c.
3 is turned off, so that the power supply circuit 7 is not supplied with power from the battery 2 as shown in FIG. Therefore, the turning electric motor 3 is not driven, and the power of the battery 2 is not consumed.

Next, as shown in FIG. 3B, when the operation lever 5 is operated by 30% with respect to the total operation amount, the pulse width d1 of the voltage pulse becomes 30 with respect to the period D of the pulse voltage. % (D1 / D = 0.3).
That is, the duty ratio becomes 0.3 by the calculation in the power supply control unit 83 based on the detection result of the operation angle sensor 81.
Is output to the chopper circuit 84, and the pulse signal from the chopper circuit 84 causes the transistor 73 to be turned on and off so that the duty ratio is set to 0.3. A pulse voltage as shown in FIG. As a result, the average value of the current flowing through the power supply circuit 7 over time becomes 30% of the electromotive force of the battery 2, and the turning electric motor 3 rotates at a rotation speed corresponding to this voltage value.

Next, as shown in FIG. 3C, when the operation amount of the operation lever 5 is set to 60% of the total operation amount, the pulse width d2 of the voltage pulse becomes equal to the pulse voltage period D. (D2)
/D=0.6). Thus, the average value of the current flowing through the power supply circuit 7 over time is 60% of the electromotive force of the battery 2.
And the turning motor 3 has a duty ratio of 0.3.
Will rotate at a higher rotation speed than in the case of.

Then, as shown in FIG. 3D, when the operation lever 5 is operated to the maximum, the chopper circuit 8 is operated.
A signal is constantly output from the transistor 4 to the transistor 73, whereby all the electromotive force of the battery 2 is applied to the turning electric motor 3, and the turning electric motor 3 rotates at the maximum rotation speed.

In this embodiment, when the operation lever 5 is operated to the right in FIG.
A first pulse signal line 84a and a third pulse 3 determine that the operation lever 5 has been operated to the right based on the detection signal of the operation angle sensor 81, and rotate the turning motor 3 in one direction. A pulse signal is output to the bases of the first transistor 73a and the third transistor 73c via the signal line 84c.

The first transistor 73a and the third transistor 73c are turned on intermittently by the output of the pulse signal, and the current from the battery 2 is supplied to the anode side wiring 71.
a, the first transistor 73a on the first parallel wiring 72a,
And third transistor 73c on second parallel wiring 72b
2 is supplied to the turning motor 3 from left to right in FIG.
Is rotationally driven in one direction via a transmission 31.

Next, when the operation lever 5 is operated to the left in FIG.
The second pulse signal line 84b and the fourth pulse signal line 8 are used to determine that the operation lever 5 has been operated to the left on the basis of the detection signal of No. 1 and to rotate the turning motor 3 in the other direction.
A pulse signal is output to the bases of the second transistor 73b and the fourth transistor 73d via 4d.

The output of the pulse signal turns on the second transistor 73b and the fourth transistor 73d intermittently, and the current from the battery 2 is supplied to the anode-side wiring 71.
a, the second transistor 73b on the second parallel wiring 72b,
And fourth transistor 73d on first parallel wiring 72a
The current is supplied to the turning motor 3 from right to left in FIG.
Are rotationally driven in the other direction via the transmission 31.

When the operation lever 5 is set at the neutral position, the chopper circuit 84 receives the control signal from the power supply control unit 83, which is determined based on the detection signal from the operation angle sensor 81. A pulse signal is not output to any of the transistors 73a, 73b, 73c, 73d. Therefore, the operation lever 5
Is set to the neutral position, each transistor 73
Since a, 73b, 73c and 73d are off,
The electric power from the battery 2 is not supplied to the turning electric motor 3, and the turning electric motor 3 does not rotate except for rotation by inertia.

Accordingly, when the turning motor 3 is rotating by inertia while the operating lever 5 is set to the neutral position, the turning motor 3 functions as a generator, and the obtained induced power is a predetermined value. The battery 2 is supplied to the battery 2 via a diode 74 (any one of the first to fourth diodes 74a, 74b, 74c, 74d).
Is to be charged.

FIGS. 4 and 5 are explanatory diagrams for explaining the operation of the present invention. FIG. 4 shows a current path when the operation lever 5 is operated to the right and returned to the neutral position. ,
(A) shows a motor drive mode in which the operation lever is operated rightward, and (B) shows a motor generation mode in which the operation lever is returned to the neutral position. FIG. 5 shows a current path when the operation lever 5 is operated to the left and then returned to the neutral position. FIG. 5A shows a motor drive mode in which the operation lever is operated to the left, and FIG. The motor power generation mode in which the lever is returned to the neutral position is shown.

First, the motor drive mode in which the operation lever 5 is tilted to the right will be described with reference to FIG. When the operation lever 5 is tilted rightward with the key switch 70 turned on,
A pulse signal corresponding to the operation amount of the operation lever 5 is output from the chopper circuit 84 to the bases of the first transistor 73a and the third transistor 73c. In this case, no pulse signal is output to the second transistor 73b and the fourth transistor 73d. Then, a current path from the battery 2 is formed in the power supply circuit 7 as shown by a thick solid line in FIG. 4A, and the turning electric motor 3 on the electric motor wiring 75 is directed from left to right. Thus, the electric current is supplied from the battery 2, whereby the turning electric motor 3 rotates in one direction, and the working member 13 turns in one direction around the vertical axis 12 b via the transmission 31.

Then, when the operating lever 5 is returned to the neutral position during the turning of the working member 13 in one direction, the first operation from the chopper circuit 84 is performed based on the control signal from the power supply control section 83 which has determined this. Transistor 73a and second
The output of the pulse signal to the transistor 73b is stopped. However, the working member 13 has a vertical axis 12
In order to continue turning in one direction around b, the turning motor 3 is switched to the role of a generator, and a current flow in a power generation mode indicated by a bold solid line in FIG. Is done. Thereby, the battery 2 is charged.

Next, a case where the operation lever 5 is operated to the left will be described with reference to FIG. When the operation lever 5 is tilted to the left, a pulse signal corresponding to the operation amount of the operation lever 5 is output from the chopper circuit 84 to the bases of the second transistor 73b and the fourth transistor 73d. In this case, the first transistor 73a and the third transistor 7
No pulse signal is output to 3c. As a result, a current path from the battery 2 is formed in the power supply circuit 7 as shown by a thick solid line in FIG. 5A, whereby the turning electric motor 3 on the electric motor wiring 75 is moved from right to left. , The turning electric motor 3 is rotated in the other direction via the transmission 31, and the working member 13 is turned in the other direction about the vertical axis 12b.

Next, when the operating lever 5 is returned to the neutral position during the turning of the working member 13 in the other direction, the second operation from the chopper circuit 84 is performed based on the control signal from the power supply control unit 83 which has determined the operation lever 5. Transistor 73b and second
The output of the pulse signal to the transistor 73b is stopped. However, the working member 13 has a vertical axis 12
In order to continue turning in the other direction around b, the turning motor 3 is switched to the role of a generator, and a current flow in a power generation mode indicated by a bold solid line in FIG. Is done. Thereby, the battery 2 is charged.

According to the present invention, as described in detail above, in the battery driven shovel car 1, a plurality of transistors 73 are arranged in a predetermined arrangement in the power supply circuit 7 for the turning motor 3.
a, 73b, 73c, 73d and a diode 74a,
74b, 74c, and 74d, and control means 82 for controlling a pulse signal output to each of the transistors 73a, 73b, 73c, and 73d in accordance with the operation direction and the operation amount of the operation lever 5, is provided. The work member 13 is turned by the drive of the turning electric motor 3 by the operation to the operating position, and the operating member 5 is returned to the neutral position while the work member 13 is turning, thereby continuing the turning by inertia. 13, the turning electric motor 3 is caused to rotate together, and the electric power induced by the inertial rotation of the rotor of the turning electric motor 3 is stored in the battery 2.
By appropriately operating the operation lever 5 to rotate the working member 13 by inertia as much as possible, the induced power generated by the inertial rotation of the rotor of the turning electric motor 3 due to the inertial rotation is stored in the battery 2. The life of the battery 2 can be extended, and the shovel car 1 can be operated for a longer time.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the crawler-type shovel car 1 has been described as an example of the working machine. However, the present invention is limited to the crawler-type shovel car. Instead, it may be a wheel-type shovel truck, or may be a crawler-type or wheel-type other working machine such as a crane truck or a loader truck.

(2) In the above embodiment, the operation of the base arm 13a, the distal arm 13b, and the shovel 13c of the working member 13 is performed by the operation of the actuators 14a, 14b, and 14c driven by the pump 4. Instead of doing this, work member 1
The operation of the base arm 13a, the distal arm 13b, and the shovel 13c of the motor 3 is not performed by the hydraulic pump 4 but also by the electric motor 3.
May be directly transmitted.

(3) In the above embodiment, the power supply circuit 7 includes the transistor 73a as a switch element,
Although 73b, 73c, and 73d are provided, the present invention is not limited to providing a switch element in the power supply circuit 7, and a normal relay switch is provided, and the relay switch is opened and closed to open and close. Electric power induced by inertial rotation of the rotor of the electric motor 3 may be recovered.

[0058]

According to the battery-powered working machine of the first aspect of the present invention, the electric power from the battery is supplied to the electric motor by switching the operating lever from the neutral position to the operating position, and the operating lever is moved from the operating position. A drive circuit comprising: a power supply circuit having a switch element; and a power storage circuit having a rectifier element, for supplying induced power from an electric motor which rotates by inertial operation of a working member by switching to a neutral position to the battery. The motor is driven by the inertial operation of the working member by returning the operating lever once operated to the operating position to the neutral position during the operation of the working member, and the induced power generated by the driven of the motor is recovered by the battery. Battery life can be extended correspondingly, and a single charge of the battery from external power provides longer battery life. It is possible to perform the work between. Therefore, the frequency of interrupting the work due to the charging operation using the external power is reduced, and the work efficiency can be improved accordingly.

By employing a switch element in the power supply circuit and a rectifier element in the power storage circuit, the circuit configuration for recovering power by inertial rotation of the motor rotor can be simplified.

According to the battery-powered working machine of the second aspect of the present invention, since the transistor is used as the switching element and the diode is used as the rectifying element, the transistor can reliably fulfill the function as the switching element. In other words, the diode can reliably function as a rectifying element, and the driving circuit can have high reliability. These elements are inexpensive and are effective in reducing the manufacturing cost of the drive circuit.

According to the battery-powered work machine of the third aspect of the present invention, since the control means for turning the transistor on and off at a duty ratio corresponding to the operation amount of the operation lever is provided, the operation lever is set to the operating position. In this state, electric power having a duty ratio corresponding to the operation amount of the operation lever is supplied to the electric motor by a control signal from the control device, and the electric motor rotates at a rotation speed corresponding to the operation amount of the operation lever. Can be operated at a speed corresponding to the operation amount of the operation lever.

The electric motor is supplied with electric power from the battery by application of a pulse voltage formed by turning on and off the switch element. Therefore, when electric power is supplied through a conventional variable resistor, for example, In comparison, there is no inconvenience that power is not efficiently supplied to the motor due to the power consumption of the resistor, and the life of the battery can be extended accordingly.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of a work machine according to the present invention.

FIG. 2 is a wiring diagram illustrating an embodiment of a drive circuit (electric system) according to the present invention.

FIGS. 3A to 3D are waveform diagrams illustrating a relationship between an operation amount of an operation lever and a pulse voltage flowing through a power supply circuit.

FIG. 4 shows a current path when the operation lever is returned to the neutral position after being operated to the right, (a) shows a motor drive mode, and (b) shows a motor generation mode.

FIGS. 5A and 5B show a current path when the operation lever is returned to the neutral position after being operated to the left, and FIG. 5A shows a motor drive mode and FIG. 5B shows a motor generation mode.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shovel car 11 riding section 11a direction changing actuator 11b horizontal axis 11c horizontal axis 12 crawler 12a base 13 working member 13a proximal arm 13b distal arm 13c shovel 14 actuator 14a proximal actuator 14b intermediate actuator 14c distal actuator 2 battery 3 Turning Electric Motor 31 Transmission 4 Hydraulic Pump 5 Operating Lever 6 Electric System (Drive Circuit) 7 Power Supply Circuit 71a Anode-side Wiring 71b Cathode-side Wiring 72a First Parallel Wiring 72b Second Parallel Wiring 73a to 73d First to Fourth Transistors 74a to 74b First to fourth diodes 75 Motor wiring 8 Control circuit 81 Operating angle sensor 82 Control means 83 Power supply control units 84a to 84d First to fourth pulse signal lines

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Komiyama 3-12-4 Gion, Asaminami-ku, Hiroshima City Inside Aburaya Heavy Industries, Ltd.

Claims (3)

[Claims] 1. A battery drive comprising: a motor for driving by receiving electric power from a mounted battery; a work member for performing a predetermined operation by driving the motor; and an operation lever for driving and operating the work member. Work machines,
The operation lever is provided so as to be operable between a neutral position at which the operation member stops operating and an operation position at which the operation member operates. Electric power is supplied to the electric motor to operate the work member, and the operation lever is switched from the operation position to the neutral position during operation of the work member, so that the battery is driven by the induced power from the electric motor driven by the inertial operation of the work member. A drive circuit that supplies power from the battery to the motor, and a power storage circuit that supplies to the battery the induced power of the motor that is driven by the inertial operation of the working member. The power supply circuit has a switch that is turned on when the operating lever is located at the operating position and turned off when the operating lever is located at the neutral position. And a rectifying element for preventing power supply from the battery to the motor and allowing power supply from the motor to the battery. Driven work machine. 2. The battery-operated working machine according to claim 1, wherein said switch element is a transistor, and said rectifier element is a diode. 3. The battery-powered work machine according to claim 2, further comprising control means for turning on / off the transistor at a duty ratio corresponding to an operation amount of an operation lever.