JP2828399B2 - Drive switching method for engine / motor selective drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive switching method for an engine / motor selective drive device which can drive a machine by either an engine or a motor and requires continuous operation.

[0002]

2. Description of the Related Art Conventionally, an engine / motor selective driving device 1 shown in FIG. 8 is known. This device couples one end of a rotating shaft 5 of a motor 4 to a driven shaft 3 of a machine 2,
The output shaft 8 of the engine 7 is connected to the other end of the rotating shaft 5 via a clutch 6 connected to an operation unit (not shown) so that the machine 2 can be driven by either the motor 4 or the engine 7. It was done. In FIG. 8, reference numeral 9 denotes a coupling, and a fuel supply channel (not shown) is connected to the engine 7. For example, the drive of the machine 2 is
When the motor 2 is switched to the motor 4, the clutch 6 is disengaged, the machine 2 is temporarily stopped or decelerated, and then the motor 4 is started. On the other hand, when the drive unit of the machine 2 is switched from the motor 4 to the engine 7, the power of the motor 4 is turned off, and the machine 2 is temporarily stopped or decelerated. A drive switching method is adopted in which the engine 6 is started below, then the clutch 6 is connected and a load is applied to the engine 7.

[0003]

In the drive switching method applied to the engine / motor selective drive device 1 described above,
When the drive of the machine 2 is switched, it is necessary to always stop the machine 2 or take a step of decelerating it. For this reason, there is a problem that the above-described drive switching method cannot be applied to a device that requires continuous operation. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a drive switching method of an engine / motor selective drive device capable of switching drive during operation of a machine without stopping or decelerating the operation. It is something to offer.

[0004]

According to a first aspect of the present invention, there is provided a motor in which one end of a rotating shaft is connected to a driven shaft of a machine, and an output shaft is connected to the other end of the motor via a clutch. And the engine speed is switched to one of the rated speed and the no-load speed of the motor, and the frequency of the power supplied to the motor is changed so that the rated speed and the no-load speed are changed. A switching device for limiting the lower limit of the engine to the upper limit of the rated speed while setting the upper limit of the engine to the lower limit of the no-load speed when the engine speed changes. A drive switching method for an engine / motor selective drive device, wherein, when a drive unit of the machine is switched from the motor to the engine, in a first step, the engine is started and the switching device is used. It performs a switch to the rated speed, the second
In a step, the clutch is engaged, and in a third step, the engine speed is switched from the rated speed to the no-load speed by the switching device, and in a fourth step, switching in the third step is performed. Then, when the power of the motor is turned off, and conversely, when the drive unit of the machine is switched from the engine to the motor, the power of the motor is turned on in a first step, and the rotational speed of the engine is turned on in a second step. Is set equal to the rated speed by the switching device, the clutch is disengaged after a lapse of a set time in a third step, and the engine is stopped in a fourth step.

A second invention provides a motor in which one end of a rotating shaft is connected to a driven shaft of a machine, an engine in which an output shaft is connected to the other end of the motor via a clutch, and a rotational speed of the engine. When the motor is switched to either the rated speed or the no-load speed of the motor and the frequency of the power supplied to the motor changes to change the rated speed or the no-load speed, the upper limit of the engine is set. A switching device that limits the lower speed of the engine to the upper limit of the rated speed while setting the speed to the upper limit of the no-load speed;
A power reduction switch that detects power consumption of the motor and operates when the power consumption is equal to or less than a set value and stops supplying the power; and when the engine starts deceleration, from this deceleration start. A timer for operating after a set time has elapsed to start supplying power to the motor, the method comprising:
In the case where the drive unit of the machine is switched from the motor to the engine, in a first step, the starting and starting of the engine are performed.
Switching to the rated speed by the switching device,
In a second step, the clutch is engaged, and in a third step, the engine speed is switched from the rated speed to the no-load speed by the switching device, and in a fourth step, a third step is performed. After switching, the power of the motor is turned off. Conversely, when the drive unit of the machine is switched from the engine to the motor, the power of the motor is turned on in a first step, and the engine is turned on in a second step. The rotational speed is made equal to the rated rotational speed by the switching device, the clutch is disengaged in a third step after a lapse of a set time, and the engine is stopped in a fourth step.

[0006]

According to the first aspect of the present invention, not only can the load be smoothly transferred from the motor to the engine or vice versa, but also if the frequency of the power fluctuates, At the time of switching, the difference between the rotation speeds of the engine and the motor can be minimized.

[0007] With the configuration as in the second aspect of the invention, in addition to the operation of the first aspect of the invention, even when the frequency of the electric power fluctuates, the fluctuation of the load of the engine when the drive unit is switched becomes small.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an engine / motor selective drive device 11 to which the drive switching method according to the first invention is applied, and FIG.
The same reference numerals are given to the same parts as those of the apparatus shown in FIG. First, a case where the drive switching method according to the first invention is applied will be described. An operation unit for operating the clutch 6 is connected to the clutch 6 of the engine / motor selective driving device 11. The device shown in FIG. 1 shows an example in which a hydraulic flow path 14 provided with an electromagnetic three-way switching valve 13 is employed as an operation unit. In addition, a compressed gas flow path provided with the three-way switching valve 13 may be provided as the operation unit, or the clutch 6 may be electrically operated.

In addition, this device includes a governor 16 provided in a fuel flow path 15 connected to the engine 7 and a rated speed signal (hereinafter referred to as a signal I) or a no-load speed signal for the governor 16. A switching device 18 having a speed setting device 17 for outputting a signal (hereinafter referred to as signal II) is provided. Then, for example, a signal (not shown) is
By turning on either the internal contact for I output or the internal contact for signal II output, either the signal I or the signal II is output from the speed setting device 17 to the governor 16.
The fuel supplied to the engine 7 is adjusted according to a signal from the speed setting device 17, and when the output signal is the signal I, the rotation speed of the engine 7 is equal to the rated rotation speed of the motor 4 (for example, 1).
770 rpm), when the output signal is the signal II, the rotation speed becomes the no-load rotation speed of the motor 4 (for example, 1800 rpm).

In addition to the above-described functions, the governor 16 further changes the frequency of the electric power supplied to the motor 4 so that the rated rotation speed of the motor 4 (for example, 17 Hz at 60 Hz, 4P).
88 rpm), no-load rotation speed (for example, 60HZ, 4P
, 1800 rpm), the upper limit rotation speed of the engine 7 is changed to the lower limit value of the no-load rotation speed (for example,
While it is set to 1797 rpm in the case of 59.9 HZ, it also functions to limit the lower limit rotation speed of the engine 7 to the upper limit value of the rated rotation speed (for example, 1791 rpm in the case of 60.1 HZ).

Next, a description will be given of a drive switching method according to the first invention applied to the engine / motor selective drive device having the above configuration. A case where the drive unit of the machine 2 is switched from the motor 4 to the engine 7 will be described. in this case,
The motor 4 rotates at the rated speed, the engine 7 stops,
The clutch 6 is in a disengaged state. First, in a first step, starting of the engine 7 and switching to the rated rotation speed by the switching device 18, specifically, the selector switch 19 are performed. As a result, the engine 7 reaches the rated speed in a no-load state. In the second step, the clutch 6 is brought into a connected state by switching the oil flow path by the three-way switching valve 13. Since the rotational speeds of the motor 4 and the engine 7 are the same, the transition of the clutch 6 to the connected state is performed smoothly. In this state, the motor 4 is in the full load operation state,
The engine 7 is still in a no-load operation state.

When the clutch 6 is set in the connected state,
Even if the frequency fluctuates and becomes large (for example, 6
0.1HZ), even if the rated rotation speed of the motor 4 is higher than the normal rotation speed (for example, 1788 rpm) (for example, 1791 rpm), as shown in FIG.
Is the upper limit (for example, 1791 rpm)
Therefore, when the clutch 6 is connected, the switching is smoothly performed without the motor 4 being temporarily overloaded. However, when the motor 4 is turned off (turned off) in the fourth step, the load on the engine 7 fluctuates rapidly as shown in FIG. Engine 7
It is necessary to use something that can withstand it.

In a third step, the number of revolutions of the engine 7 is switched from the above-mentioned rated number of revolutions to the above-mentioned no-load number of revolutions by the selector switch 19 of the switching device 18. As a result, the engine 7 is gradually accelerated to the no-load rotation speed of the motor 4, and accordingly, the load shifts to the engine 7, and the motor 4 shifts to the no-load operation state. The acceleration time of the motor 4 is adjusted by the switching device 18. In the fourth step, the power of the motor 4 is turned off when a preset acceleration time has elapsed after the switching in the third step. This acceleration time is determined based on the time until the engine reaches the set rotation speed of the motor 4. Thus, the switching of the driving unit is completed.

Next, a case where the drive unit of the machine 2 is switched from the engine 7 to the motor 4 contrary to the above-described switching will be described. In this case, the engine 7 operates at the no-load rotation speed of the motor 4, the power supply to the motor 4 is stopped, and the clutch 6 is in the connected state. In a first step, the power of the motor 4 is turned on. Since the engine 7 is operating, the motor 4 enters the no-load operation state. In the second step, the number of revolutions of the engine 7 is changed by the selector switch 1 of the switching device 18.
9 to switch to the rated speed. As a result, the engine 7 is gradually decelerated from the no-load speed to the rated speed, the load is transferred to the motor 4, and the engine 7 enters a no-load state.

The deceleration time of the engine 7 is adjusted by the switching device 18. In addition, in addition to the content of the above-described drive switching method of the engine 7, in the second step, after the engine deceleration is started, even if the frequency fluctuates and becomes large, the rated rotation speed of the motor 4 becomes larger than the normal rotation speed. Even so, as shown in FIG. 2, since the lower limit rotation speed of the engine 7 is limited to the upper limit value, the motor 4 does not temporarily become overloaded when the clutch 6 is connected, Switching is performed smoothly.

Further, even if the frequency of the power supply fluctuates and becomes smaller, after the acceleration of the motor 4 is started when the motor 4 is switched to the engine 7, the motor 4 is switched when the engine 4 is switched to the motor 4. In any case when the power is turned on, as shown in FIG. 3, since the upper limit rotation speed of the engine 7 is limited, the engine 7 is temporarily overloaded, or the motor 4 generates electric power. What happens is avoided. In the third step, the clutch 6 is set to the disengaged state after a lapse of a set time after the switching in the second step. The set time is determined based on the time from when the switching is performed to when the engine reaches the rated rotation speed of the motor 4. In a fourth step, the engine 7 is stopped.
Thus, the switching of the driving unit is completed.

FIG. 4 shows another engine / motor selective drive device 20 to which the drive switching method according to the first invention is applied, which is different from the device shown in FIG.
Are substantially the same except that a power consumption reduction switch 22 is provided. Parts common to each other are denoted by the same reference numerals and description thereof is omitted. When the switch 22 is operated even before a preset acceleration time, the power consumption reduction switch 22 turns off the power of the motor 4 and
This prevents the motor 4 from becoming a generator. The method of switching the drive unit itself is the same as that of the apparatus shown in FIG.

FIG. 5 shows another engine / motor selective drive device 30 to which the drive switching method according to the second invention is applied. The device shown in FIG. Except for the point described above, the other parts are substantially the same in the drawings, and the common parts are denoted by the same reference numerals and description thereof is omitted. When the engine 7 starts decelerating, the timer 31 operates so as to turn on the power of the motor 4 after a lapse of a set time from the start of the deceleration. The power consumption reduction switch 22 operates to turn off the power of the motor 4 when the power consumption of the motor 4 becomes equal to or less than the set value, as in the case described above.

In this case, in addition to the function of the first invention, the governor 16 further changes the frequency of the power supplied to the motor 4 to change the rated rotation speed of the motor 4 (for example, 60H).
Z, 1P rpm at 4P), no-load rotation speed (for example,
When 1800 rpm changes at 60 HZ, 4P), the upper limit rotation speed of the engine 7 is changed to the upper limit value of the no-load rotation speed of the motor 4 (for example, 1803 in the case of 60.1 HZ).
rpm), and the lower limit rotation speed of the engine 7 is set to the upper limit value of the above-mentioned rated rotation speed (for example, 17 in the case of 60.1 Hz).
91 rpm).

Next, a description will be given of a drive switching method according to a second invention applied to the engine / motor selective drive device having the above-described configuration. A case where the drive unit of the machine 2 is switched from the motor 4 to the engine 7 will be described. in this case,
The motor 4 rotates at the rated speed, the engine 7 stops,
The clutch 6 is in a disengaged state. First, in a first step, starting of the engine 7 and switching to the rated rotation speed by the switching device 18, specifically, the selector switch 19 are performed. As a result, the engine 7 reaches the rated speed in a no-load state. In the second step, the clutch 6 is brought into a connected state by switching the oil flow path by the three-way switching valve 13.

In a third step, the rotation speed of the engine 7 is switched from the rated rotation speed to the no-load rotation speed by the selector switch 19 of the switching device 18. As a result, the engine 7 is gradually accelerated to the no-load rotation speed of the motor 4, and accordingly, the load shifts to the engine 7, and the motor 4 shifts to the no-load operation state. The acceleration time of the motor 4 is adjusted by the switching device 18. In the fourth step, after the switching in the third step, when the power consumption of the motor 4 becomes equal to or less than the set value and the power consumption price switch 22 is operated, the power of the motor 4 is turned off. Then the engine 7
Rises to the speed specified by signal II. Thus, the switching of the driving unit is completed.

Next, a case where the drive unit of the machine 2 is switched from the engine 7 to the motor 4 contrary to the above-described switching will be described. In this case, the engine 7 operates at the no-load rotation speed of the motor 4, the power supply to the motor 4 is stopped, and the clutch 6 is in the connected state. In the first step, the number of revolutions of the engine 7 is changed by the selector switch 1 of the switching device 18.
9 to switch to the rated speed. As a result, the engine 7 is gradually decelerated from the no-load speed to the rated speed. In the second step, the power of the motor 4 is turned on after a time T seconds until a certain speed (the lower limit value due to the power supply frequency fluctuation of the rated rotation speed of the motor 4) is reached.

The deceleration time of the engine 7 is adjusted by the switching device 18. In the third step, the clutch 6 is set to the disengaged state after a lapse of a set time after the switching in the second step. The set time is determined based on the time from when the switching is performed to when the engine reaches the rotation speed specified by the signal I. In a fourth step, the engine 7 is stopped. Thus, the switching of the driving unit is completed.

When the drive unit of the machine 2 is switched from the motor 4 to the engine 7, in addition to the above-described drive switching method, if the clutch 6 is engaged in the second step, even if the frequency fluctuates. 7 (for example, 60.1 Hz), and the rated rotation speed of the motor 4 is higher than a normal rotation speed (for example, 1788 rpm) (for example, 1791 rpm), the engine 7 does not rotate as shown in FIG. Is lower than the upper limit (for example, 1791r
pm), the switching is performed smoothly without the motor 4 being temporarily overloaded when the clutch 6 is connected. Further, since the timer 31 is provided, the load on the engine 7 does not suddenly increase when the power of the motor 4 is turned off, and the upper limit rotational speed is limited. Motor 4
When the power of the engine is turned off (when it is turned off), the engine 7
Thus, a situation in which the load is not fluctuated abruptly and power is generated by the motor 4 is avoided.

Further, since the timer 31 is provided, even if the frequency of the power supply fluctuates and becomes smaller (for example, 59.
9HZ), as shown in FIG. 7, when the power of the motor 4 is turned off, the situation in which the load applied to the engine 7 does not fluctuate abruptly and the motor 4 generates power as described above is avoided. It has become. The same applies to the case where the drive unit of the machine 2 is switched from the motor 4 to the engine 7.

[0026]

As is apparent from the above description, according to the first aspect, a motor in which one end of a rotating shaft is connected to a driven shaft of a machine, and an output shaft is connected to the other end of the motor via a clutch. The coupled engine and the rotational speed of the engine are switched to one of the rated rotational speed and the no-load rotational speed of the motor, and the frequency of the power supplied to the motor changes to change the rated rotational speed and the no-load rotational speed. If changes,
A switching device for limiting the lower limit of the engine to the upper limit of the rated speed while setting the upper limit of the engine to the lower limit of the no-load speed. In the drive switching method, when the drive unit of the machine is switched from the motor to the engine, in a first step, the engine is started, and the switching device is switched to the rated speed, and the second step is performed. In a step, the clutch is engaged, and in a third step, the engine speed is switched from the rated speed to the no-load speed by the switching device, and in a fourth step, switching in the third step is performed. Thereafter, when the power of the motor is turned off, and conversely, when the drive unit of the machine is switched from the engine to the motor, the power of the motor is turned on in the first step and the second switch is turned on. In the step, the rotation speed of the engine is made equal to the rated rotation speed by the switching device. In a third step, the clutch is disengaged after a lapse of a set time, and in a fourth step, the engine is stopped. It is.

For this reason, during the operation of the machine, the operation can be smoothly performed without stopping or decelerating the operation, and the use of the engine / motor selective driving device can be performed even in the field where continuous operation of the machine is required. Not only becomes possible, but also in the case where the frequency drive of the electric power fluctuates, there is an effect that the overload of the motor and the overload of the engine can be eliminated when the moving part is switched, and the generation of electric power by the motor can be prevented.

According to the second aspect of the present invention, there is provided a motor in which one end of a rotating shaft is connected to a driven shaft of a machine, an engine in which an output shaft is connected to the other end of the motor via a clutch, and a rotation of the engine. When the engine speed is switched to one of the rated speed and the no-load speed of the motor, and the frequency of the power supplied to the motor changes to change the rated speed and the no-load speed, this engine A switching device that limits the lower limit rotation speed of the engine to the upper limit value of the rated rotation speed while detecting the power consumption of the motor, A power reduction switch that operates when the power is equal to or less than a set value and stops the supply of the power; and, when the engine starts to decelerate, operates after a lapse of a set time from the start of the deceleration to operate the motor. A drive switching method for an engine / motor selective drive device, comprising: a timer for starting a power supply, wherein when the drive unit of the machine is switched from the motor to the engine, in a first step, the engine Starting, switching to the rated speed by the switching device is performed, and in a second step, the clutch is engaged,
In a third step, the engine speed is switched from the rated speed to the no-load speed by the switching device. In a fourth step, after switching in the third step, the power of the motor is turned off. When the drive unit of the machine is switched from the engine to the motor, in a first step, the power of the motor is turned on. In a second step, the engine speed is switched by the switching device to the rated speed. In a third step, the clutch is disengaged after a lapse of a set time, and the engine is stopped in a fourth step.

Therefore, in addition to the effect of the first invention,
When the drive unit is switched, it is possible to prevent an abrupt change in the load of the engine.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of an engine / motor selective drive device to which a drive unit switching method according to a first invention is applied.

FIG. 2 is a diagram illustrating a relationship between a switching sequence of a driving unit and an operating state in the device illustrated in FIG. 1 when the frequency of power fluctuates and increases.

FIG. 3 is a diagram showing a relationship between a switching sequence of a drive unit and an operating state in the device shown in FIG. 1 when the frequency of power fluctuates and becomes smaller.

FIG. 4 is a diagram showing the overall configuration of another engine / motor selective drive device to which the drive unit switching method according to the first invention is applied.

FIG. 5 is a diagram showing an overall configuration of an engine / motor selective drive device to which a drive unit switching method according to a second invention is applied.

FIG. 6 is a diagram showing a relationship between a switching sequence of a drive unit and an operating state in the device shown in FIG. 5 when the frequency of power fluctuates and increases.

FIG. 7 is a diagram showing a relationship between a switching sequence of a drive unit and an operating state in the device shown in FIG. 5 when the frequency of electric power fluctuates and decreases.

FIG. 8 is a diagram showing an overall configuration of another engine / motor selective drive device to which a conventional drive unit switching method is applied.

[Explanation of symbols]

 2 Machine 3 Driven shaft 4 Motor 5 Rotary shaft 6 Clutch 7 Engine 8 Output shaft 11, 20, 30 Engine / motor selective drive device 18 Switching device 22 Power consumption fixed price switch 31 Timer

Claims (2)

(57) [Claims] 1. A motor in which one end of a rotating shaft is connected to a driven shaft of a machine, an engine in which an output shaft is connected to the other end of the motor via a clutch, and the number of rotations of the engine is set to a rated rotation of the motor. And when the frequency of the power supplied to the motor changes and the rated speed and the no-load speed change, the upper limit speed of the engine is set to the no-load speed. A switching device for limiting a lower limit of the engine speed to an upper limit value of the rated speed while setting a lower limit value of the load rotation speed. When the drive unit is switched from the motor to the engine in the first step, the engine is started and the switching device is switched to the rated speed in the first step.
In a step, the clutch is engaged, and in a third step, the engine speed is switched from the rated speed to the no-load speed by the switching device, and in a fourth step, switching in the third step is performed. Then, when the power of the motor is turned off, and conversely, when the drive unit of the machine is switched from the engine to the motor, the power of the motor is turned on in a first step, and the rotational speed of the engine is turned on in a second step. The switching speed is made equal to the rated speed by the switching device, the clutch is disengaged after a lapse of a set time in a third step, and the engine is stopped in a fourth step. A drive switching method for a drive device. 2. A motor in which one end of a rotating shaft is connected to a driven shaft of a machine, an engine in which an output shaft is connected to the other end of the motor via a clutch, and the number of rotations of the engine is set to the rated rotation of the motor. And when the frequency of the power supplied to the motor changes and the rated speed and the no-load speed change, the upper limit speed of the engine is set to the no-load speed. A switching device that limits the lower limit speed of the engine to the upper limit value of the rated speed while setting the upper limit value of the load speed, and detecting the power consumption of the motor and detecting that the power consumption is equal to or less than a set value. A power reduction switch that operates to stop the supply of the electric power, and a timer that operates when the engine starts to decelerate and starts power supply to the motor after a lapse of a set time from the start of the deceleration. A drive switching method for an engine / motor selective drive device comprising: a drive unit for switching the drive unit of the machine from the motor to the engine;
In a first step, the engine is started and switching to the rated speed is performed by the switching device. In a second step, the clutch is engaged. In a third step, the engine speed is changed to the switching device. By switching from the rated speed to the no-load speed, in the fourth step,
After the switching in the third step, the power of the motor is turned off. Conversely, when the drive unit of the machine is switched from the engine to the motor, the power of the motor is turned on in the first step, and the power is turned on in the second step. The rotational speed of the engine is made equal to the rated rotational speed by the switching device, the clutch is disengaged after a lapse of a set time in a third step, and the engine is stopped in a fourth step. Switching method of the engine / motor selective driving device.