JP2003013865A - Pump, pump control method, and motor control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique to easily set operation control under various modes in operation of a coolant pump. SOLUTION: The coolant pump 100 is provided with a function selection part 112 and obtains operation information J of a main machine 90 here. The same is provided with a setting part 111 and a function which the function selection part 112 is provided with is selected and necessary parameter for the function is provided according to a setting of the setting part 111. The function selection part 112 is provided with four functions of a start and stop function 81, an intermittent operation 82, a mass flow operation 83, a slipping detection control 84 and a selector switch 112a graphically indicates that those functions are selectable. A speed control part 114, a motor 115, and a pump main body 113 are also provided. The speed control part 114 controls rotation speed of the motor 115 with inverter control based on the function selected at the function selection part 112 and set parameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump, for example, a coolant pump.

[0002]

2. Description of the Related Art Coolant pumps are used for various purposes in machine tools. For example, in the case of supplying cutting fluid in a machine tool. In this case, the cutting fluid may be supplied only during the machining cycle. Therefore, even if the machine tool is energized, it is desirable from the viewpoint of power consumption to stop the operation of the coolant pump unless it is in the machining cycle.
Therefore, for example, the operation of the coolant pump is stopped by turning on / off using a magnet switch or the like.

Further, in a machine tool, water may be supplied for cleaning the bed and cleaning the chip conveyor regardless of the processing cycle. In this case, since the timing at which chips and the like to be removed arrive at the cleaning portion is unknown, the timing of starting and stopping the coolant pump is also unknown, and the coolant pump was always operated.

Further, the cutting fluid required for cutting may be supplied. Since the amount of cutting fluid required differs depending on the content of the cutting process, the most necessary amount of cutting fluid was usually used.

In some cases, the cutting fluid returned from a device that performs a cutting operation (hereinafter referred to as "main machine") is once pumped to another tank to remove the chips contained therein. FIG. 9 is a block diagram conceptually showing this processing. The cutting fluid returned from the main machine 90 is temporarily stored in the primary tank 91.
Then, a pump 93 pumps up from the primary tank 91 to a processing tank 92 for removing chips. This allows
It is possible to prevent the cutting fluid from overflowing in the primary tank 91. The pump 93 operates by rotating the motor 95, and the operation of the motor 95 is controlled by the controller 94.

[0006]

When a cutting fluid is supplied to a machine tool, the starting and stopping of supplying the cutting fluid is frequently performed only during a machining cycle. If a mechanical contact such as a magnet switch is used for starting and stopping, the service life of the contact will be impaired.

Further, the constant operation performed when supplying water or the like for cleaning is not desirable from the viewpoint of power consumption because the coolant pump is operating even during the period when cleaning is unnecessary.

Further, when the cutting liquid is supplied in the most necessary amount, the cutting liquid is supplied excessively in the cutting process which requires a small amount of the cutting liquid. This is a waste of cutting fluid.

Further, when pumping the cutting fluid returned from the main machine from the primary tank 91, it is desirable to stop the pump 93 when the primary tank 91 does not store a predetermined amount of cutting fluid. This is because if the pump 93 sucks in air and spins idle, its life will be impaired. In order to avoid idling, the cutting fluid pumped up to the processing tank 92 should be reused once again.
It is necessary to return to the next tank 91 or detect the liquid level of the cutting fluid in the primary tank 91. However, when the liquid level is detected by a mechanical sensor, for example, a float switch, the cutting fluid contains cutting chips, so that malfunction is likely to occur. When detecting the liquid level with an electric sensor,
The sensor is generally expensive, and requires a control system adapted to the liquid level, which is complicated and costly.

In view of the above problems, it is an object of the present invention to provide a technique capable of easily setting the operation control in various modes when operating a coolant pump in a machine tool, for example.

[0011]

A first aspect of a pump (100) according to the present invention is a motor (115), a pump body (113) driven by the motor, and an inverter control. A speed control unit (114) for controlling the rotation speed of the motor, and a function selection unit (112) having a plurality of functions (81 to 84) and setting the operation of the speed control unit based on the selected function. A selection setting unit (111) for selecting a function from the plurality of functions.

A second aspect of the pump according to the present invention is
In the first aspect thereof, the plurality of functions has a start / stop function (81). When the start / stop function is selected, the setting unit (111) gives the operating speed (K ₁ ) to the function selecting unit (112) and the pump (10).
0) external ON / OFF command (J ₁ ) is ON, the inverter control is performed based on the operating speed, and when the ON / OFF command is OFF, the motor (115) To stop the rotation of.

In the second aspect of the pump according to the present invention, preferably, the setting unit (111) sets the second operating speed (K ₀ ) whose value is zero to the function selecting unit (11).
2), the function selection unit causes the speed control unit (11
4), the ON / OFF command (J ₁ ) is ON, O
According to the fact that it is FF, the operating speed (K
₁ ) give the second operating speed (K ₀ ).

A third aspect of the pump according to the present invention is
In its first aspect, the plurality of functions comprises intermittent operation (82). When the intermittent operation is adopted, the setting unit (111) has a plurality of operating speeds (K
₁ , K ₂ ) is given to the function selection unit (112). ON / OFF command (J ₁ ) from outside the pump (100)
When is ON, the inverter control is performed based on the selected operating speed (K _R ) sequentially selected from the plurality of operating speeds.

[0015] In a preferable third aspect of the pump according to the present invention, the setting unit (111), said plurality of working rotational speed (K _1, K ₂₎ a plurality of period corresponding to (T0,
T1) is given to the function selection unit (112). In the function selection unit, the ON / OFF command (J ₁ ) changes from ON to O.
Switching to FF, its state is initialized (S0),
A timer function (112) having a plurality of states (S0, S1) that are maintained in each of the plurality of periods and sequentially transition.
e), the function selection unit includes the speed control unit (11).
For 4), the selected operating speed (K _R ) corresponding to the state of the timer function is given.

In the third aspect of the pump according to the present invention, preferably, the rotation of the motor (115) is stopped when the ON / OFF command (J ₁ ) is OFF.

A fourth aspect of the pump according to the present invention is
In the first aspect thereof, the plurality of functions comprises a multi-flow operation (83). When the multi-flow rate operation is adopted, the setting unit (111) gives a plurality of operation speeds (K ₁ , K ₂ , K ₃ ) to the function selecting unit (112). The inverter control is performed based on a selected operating speed (K _S ) selected from the plurality of operating speeds based on a flow rate selection command (J ₂ ) given from the outside of the pump (100).

A fifth aspect of the pump according to the present invention is
In the first aspect thereof, the plurality of functions has a slip detection control (84). When the idling detection control is adopted, the setting unit (111) gives a plurality of operating speeds (K ₁ , K ₂ , K ₃ ) to the function selecting unit (112). A predetermined time period (T1,
S14), the plurality of operation as a relatively value from the rotation speed is low the (K ₂₎ (S13), as the large relatively value from among a plurality of operating rotational speed is other than the predetermined period ( The inverter control is performed based on the selected operating speed (K _R ) obtained by selecting K ₁ ) (S11).

A sixth aspect of the pump according to the present invention is
In the fifth aspect thereof, the idling is performed by the motor (11
Motor current 5) (I _M) is detected with a smaller than a predetermined threshold value (I _th) (112g).

In the sixth aspect of the pump according to the present invention, preferably, the setting section (111) gives the function selecting section (112) the predetermined period (T1). The function selection unit, in response to said motor current (I _M) transitions from a smaller value from the larger value than the predetermined threshold value (I _th), starts measuring the predetermined time period (S1
4,112h).

In the fourth to sixth aspects of the pump according to the present invention, preferably, when the ON / OFF command (J ₁ ) from the outside of the pump (100) is OFF, the rotation of the motor (115). To stop.

More preferably, the setting unit (111) gives another operating rotational speed (K ₀ ) whose value is zero to the function selecting unit (112). The function selection unit instructs the speed control unit (114) to perform the ON / OFF command (J ₁ )
Is ON or OFF, the selected operating speed (K _R , K _S ) and the other operating speed are given, respectively.

A first aspect of the pump control method according to the present invention is a motor (11) for driving a pump body (113).
The rotation speed of 5) is controlled by adopting the inverter control based on the function selected from the plurality of functions (81 to 84).

In a second aspect of the pump control method according to the present invention, in the first aspect thereof, the plurality of functions have a start / stop function (81). When the start / stop function is selected and the ON / OFF command (J ₁ ) from the outside is ON, the inverter control is performed based on the _first operating speed (K ₁ ), The ON / OFF command is O
In the case of FF, the rotation of the motor (115) is stopped.

In a third aspect of the pump control method according to the present invention, in the first aspect, the plurality of functions have an intermittent operation (82). When the intermittent operation is adopted and the ON / OFF command (J ₁ ) from the outside is ON, the selected operation sequentially selected from a plurality of operation speeds (K ₁ , K ₂ ). The inverter control is performed based on the rotation speed (K _R ).

In the third aspect of the pump control method according to the present invention, preferably, a plurality of periods (T0, T1) corresponding to the plurality of operating rotational speeds (K ₁ , K ₂ ) are set and the ON / OFF is set. OFF command (J ₁ ) changes from ON to OF
The state is initialized by switching to F (S0), a plurality of states (S0, S1) that are respectively maintained in the plurality of periods and sequentially transited are set, and the selected operation corresponding to the plurality of states is set. The inverter control is performed based on the rotation speed (K _R ).

In the third aspect of the pump control method according to the present invention, preferably, the rotation of the motor (115) is stopped when the ON / OFF command (J ₁ ) is OFF.

In a fourth aspect of the pump control method according to the present invention, in the first aspect thereof, the plurality of functions have a multi-flow rate operation (83). When the multi-flow rate operation is adopted, a plurality of operation rotational speeds (K ₁ , K ₂ , K ₃ ) based on a flow rate selection command (J ₂ ) given from the outside.
The inverter control is performed based on the selected operating rotation speed (K _S ) selected from.

In a fifth aspect of the pump control method according to the present invention, in the first aspect thereof, the plurality of functions have idling detection control (84). When the idling detection control is adopted, a comparison is made among a plurality of operating speeds (K ₁ , K ₂ , K ₃ ) for a predetermined period (T1, S14) after detecting the idling (S12). to what value is smaller (K ₂₎ to (S13), and in the other than the predetermined period that is greater relatively value from among a plurality of operating rotational speed (K ₁₎ to (S11), obtained by respectively selecting The inverter control is performed based on the selected operating speed (K _R ).

The sixth aspect of the pump control method according to the invention, in its fifth aspect, the idle motor current (I _M) is smaller than a predetermined threshold value (I _th) of said motor (115) Detected (112)
g).

[0031] triggered by this in desirably sixth aspect of the pump control method according to the invention, wherein the motor current (I _M) transitions from a smaller value from the larger value than the predetermined threshold value (I _th) The clocking of the predetermined period is started (S14, 112h).

In the fourth to sixth aspects of the pump control method according to the present invention, it is desirable that an ON / O from the outside is applied.
When the FF command (J ₁ ) is OFF, the motor (11
Stop the rotation of 5).

A first aspect of a motor control device according to the present invention is a motor (11) for driving a pump body (113).
5) A speed control unit (114) that controls the number of revolutions by using inverter control and a plurality of functions (81 to 84) are provided, and the operation of the speed control unit is set based on the selected function. And a selection setting unit (111) for selecting a function from the plurality of functions.

In a second aspect of the motor control device according to the present invention, in the first aspect, the plurality of functions have a start / stop function (81). When the start / stop function is selected, the setting unit (111) causes the operating speed (K
₁ ) is given to the function selection unit (112), and O from the outside is given.
When the N / OFF command (J ₁ ) is ON, the inverter control is performed based on the operating speed, and the ON / OFF
When the OFF command is OFF, the rotation of the motor (115) is stopped.

In the second mode of the motor control device according to the present invention, preferably, the setting section (111) sets the second operating speed (K ₀ ) whose value is zero to the function selecting section (112). And the function selection unit sends the ON / OFF command (J ₁ ) to the speed control unit (114) as O.
The operating speed (K ₁ ) and the second operating speed (K ₀ ) are given in accordance with N and OFF, respectively.

In a third aspect of the motor control device according to the present invention, in the first aspect, the plurality of functions have an intermittent operation (82). When the intermittent operation is adopted, the setting unit (111) gives a plurality of operation speeds (K ₁ , K ₂ ) to the function selecting unit (112), and an external ON / OFF command ( When J ₁ ) is ON,
The inverter control is performed based on the selected operating speed (K _R ) sequentially selected from the plurality of operating speeds.

In the third aspect of the motor control device according to the present invention, preferably, the setting section (111) has a plurality of periods (T0, T1) corresponding to the plurality of operating rotational speeds (K ₁ , K ₂ ). ) Is given to the function selection section (112), and the function selection section turns on the ON / OFF command (J ₁ ).
Is switched from OFF to OFF and the state is initialized (S0)
And a timer function (112e) having a plurality of states (S0, S1) each of which is maintained in the plurality of periods and sequentially transits, and the function selection unit is configured to operate the speed control unit (114) with the timer function (112e). The selected operating speed (K _R ) corresponding to the state of the timer function is given.

Further, in the third aspect of the motor control device according to the present invention, preferably, the rotation of the motor (115) is stopped when the ON / OFF command (J ₁ ) is OFF.

A fourth aspect of the motor control device according to the present invention is the first aspect thereof, wherein the plurality of functions have a multi-flow rate operation (83). When the multi-flow rate operation is adopted, the setting unit (111) sets a plurality of operation speeds (K ₁ , K ₂ , K ₃ ) to the function selecting unit (112).
The inverter control is performed based on the selected operating speed (K _S ) selected from the plurality of operating speeds based on the flow rate selection command (J ₂ ) given from the outside.

In a fifth aspect of the motor control device according to the present invention, in the first aspect thereof, the plurality of functions have idling detection control (84). When the idling detection control is adopted, the setting unit (111) sets a plurality of operating speeds (K ₁ , K ₂ , K ₃ ) to the function selecting unit (11).
Given to 2), a predetermined period after the detected idling (S12) (T1, S14) are those relatively value from among the plurality of operating speed small (K ₂₎ to (S13), the predetermined In a period other than the period, the inverter control is performed based on the selected operating speed (K _R ) obtained by selecting the one (K ₁ ) having a relatively large value from the plurality of operating speeds (S 11). .

A sixth aspect of the motor control device according to the present invention is the fifth aspect, wherein in the idling, the motor current (IM) of the motor (115) is a predetermined threshold value (I _M ).
_(th ), and is detected (112 g).

In the sixth aspect of the motor control device according to the present invention, preferably, the setting section (111) gives the predetermined period (T1) to the function selecting section (112), and the function selecting section, The transition of the motor current (I _M ) from a value larger than the predetermined threshold value (I _th ) to a smaller value thereof is used as a trigger to start the time measurement of the predetermined period (S14, 112h).

In the fourth to sixth aspects of the motor control device according to the present invention, it is desirable that the external ON / O is performed.
When the FF command (J ₁ ) is OFF, the motor (11
Stop the rotation of 5).

More preferably, the setting unit (111) gives another operating rotational speed (K ₀ ) whose value is zero to the function selecting unit (112). The function selection unit instructs the speed control unit (114) to perform the ON / OFF command (J ₁ )
Is ON or OFF, the selected operating speed (K _R , K _S ) and the other operating speed are given, respectively.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION A. Basic idea of the present invention. Prior to the description of various specific embodiments of the present invention, the basic idea of the present invention will be described.

FIG. 1 is a diagram showing an outline of the structure of a pump 1 usable in the present invention. The pump 1 has a so-called multi-stage impeller pump configuration, and an impeller 17 is housed in a pump case 16. The impeller 17 is rotated by the motor 13, whereby the fluid sucked from the suction port 18 is discharged to the discharge port 15. The motor 13 is covered by a motor cover 14 and cooled by the cooling fan 12. The electric circuit that drives the motor 13 is housed in the electrical equipment box 11.

Since the pump 1 is a multi-stage impeller pump, when the rotation speed of the motor 13 is constant, the standard discharge amount thereof depends on the size of the pump case 16 and the number of stages of the impeller 17. The maximum head is determined by the number of impellers 17.

FIG. 2 shows QH showing the relationship between the flow rate Q and the head H.
It is a graph which shows a curve. Curves L ₁ , L ₂ , L ₃ , and L ₄ show QH curves when the number of impellers 17 is ₁ , ₂ , ₃ , and ₄ , respectively.

The pump 1 is selected on the basis of the flow rate required by the application. Therefore, the pump 1 having the number of stages of the pump case 16 and the impeller 17 that satisfy the discharge amount matched with the flow rate is selected.

On the other hand, in the device using the pump 1,
There is a resistance to the fluid as a whole. This depends on the position of the tank for storing the fluid, the final height of the discharge, and the resistance of the pipe through which the fluid flows. The resistance is represented as a resistance curve in the QH curve.

Consider, for example, a case where a flow rate Qr is required in a device having a resistance represented by a resistance curve R. An operating point Di on the resistance curve R that satisfies the flow rate Qr represents the flow rate Qr and the head Hr required by this device. The head Hr cannot be achieved unless the pump 1 has three or more stages of the impeller 17. On the other hand, as the number of stages of the impeller 17 increases, the power required for the motor 13 also increases. Therefore, from the viewpoint of power consumption, the number of stages of the impeller 17 is preferably small.
Therefore, in this example, the number of stages of the impeller 17 is determined to be 3,
The curve L ₃ is adopted as the QH curve.

However, since the curve L ₃ and the resistance curve R intersect at the intersection D ₃ , the flow rate Q exceeds the required flow rate Qr. Therefore, since the flow rate is set to Q = Qr, the resistance of the device is increased to the resistance represented by the resistance curve Rv. Specifically, for example, a valve is inserted in the piping path to throttle the flow rate. In this case, this device requires a lift H ₃ and an operating point Dr that satisfies the flow rate Qr on the resistance curve Rv.
Works in.

However, as described above, when the pump 1 for supplying the excessive flow rate Q is adopted and the flow rate Q is further throttled by the valve, D
Since r> Di and H ₃ > Hr, the power represented by (H ₃ −Hr) · Qr is wasted for the operation at the initially requested operation point Di.

Therefore, in the present invention, the rotation speed of the motor 13 is controlled by using the inverter control. As a result, the QH curve can be controlled as if the number of stages of the impeller 17 was made infinite. By the inverter control, for example, the curve Li can be obtained and the operation at the operating point Di becomes possible. In this case, there is no useless power as described above.

Such control has a remarkable effect particularly when it is adopted in the coolant pump. As mentioned above, there are many times of starting and stopping, it is necessary to deal with various flow rates,
This is because both the function and the suppression of power consumption are required to be compatible. In the following various embodiments, by controlling the QH curve of the pump 1 by inverter control, functions specialized for various uses of the coolant pump, for example, adjustment and function selection even when the machining target is changed are easy. To provide technology that

B. Overall overview of the embodiment. FIG. 3 is a block diagram showing the configuration of the coolant pump 100 adopted in various embodiments of the present invention. The coolant pump 100 operates from the main engine 90 to the operation information J of the main engine 90.
Receive. The information J may be digital data communication, a contact state in the main machine 90, or an analog value.

The coolant pump 100 has a function selecting section 11
2 is provided, and the information J is acquired here. The coolant pump 100 further includes a setting unit 111,
By the setting here, the function included in the function selection unit 112 is selected, and the parameters necessary for the function are also given.
The function selection unit 112 has four functions, that is, a start / stop function 81, an intermittent operation 82, a large flow rate operation 83, and a slip detection control 84, which will be described later in the first to fourth embodiments.
The changeover switch 112a schematically shows that these functions can be changed over. Of course, the functions shown here are mere examples, and the function selection unit 112 does not need to have all of them, and may have other functions.

The coolant pump 100 has a speed controller 11
4, a motor 115, and a pump body 113 are also provided.
The speed control unit 114 employs inverter control to control the rotation speed of the motor 115 based on the function selected by the function selection unit 112 and the set parameters. The motor current I _M supplied to the motor 115 is fed back to the speed control unit 114. The pump main body 113 is driven by the motor 115 and has a function corresponding to, for example, the discharge port 15, the pump case 16, the impeller 17, and the suction port 18 of the pump 1 described above.

Since the drive of the coolant pump 100 is controlled by the inverter control as described above, the motor 1 is adapted to the function selected from the plurality of functions 81 to 84.
15, and thus the pump body 113 can be driven.

C. First embodiment. In the present embodiment, the function selecting unit 112 uses the start / stop function 8
The operation of the function selection unit 112 when 1 is selected will be described. The present embodiment is an operation corresponding to a request that a cutting fluid is supplied only in a machining cycle in a machine tool and is not supplied in other cases.

FIG. 4 shows the function selecting section 1 in this embodiment.
12 is a block diagram showing the outline of the operation of 12. FIG. From the main engine 90, an ON / OFF command J ₁ that gives an instruction to start and stop is given as operation information J. On the other hand, two kinds of operating speeds K ₁ (> 0) and K ₀ are given in advance from the setting unit 111. Here, the stop is instructed with the operating speed K ₀ = 0.

When the ON / OFF command J ₁ is ON, the operating speed K ₁ is ON, and when it is OFF, the operating speed K ₀ (=
0) is supplied to each speed control unit 114. The switch 112b schematically shows this switching.
By such an operation, the speed control unit 114 causes the motor 11
5 is driven or stopped at the operating speed K ₁ according to the ON / OFF command J ₁ .

In this embodiment, since the start / stop is performed by the ON / OFF command J ₁ which is the operation information J from the main machine 90, the life of mechanical contacts such as a magnet switch is not impaired.

D. Second embodiment. In the present embodiment, the function selecting unit 112 performs intermittent operation 8
The operation of the function selection unit 112 when 2 is selected will be described. The present embodiment is an operation corresponding to the case where water or the like is supplied for cleaning a portion unrelated to the processing cycle. In the present embodiment, the timing at which chips and the like to be removed arrive at the cleaning site is unknown, so intermittent pump operation is performed.

FIG. 5 shows the function selecting section 1 in this embodiment.
12 is a block diagram showing the outline of the operation of 12. FIG. From the main engine 90, an ON / OFF command J ₁ that gives an instruction to start and stop is given as operation information J. On the other hand, three kinds of operating speeds K ₀ (= 0), K ₁ (> 0) and K ₂ (> 0) are given from the setting unit 111 in advance. Also, two types of timer times T0 and T1 are set.

_{One of} the operating speeds K ₁ and K ₂ is selected as the selected operating speed K _R (one of R = 1 and 2) by the value of the mode signal TDMOD1 described later. The switch 112c schematically shows this switching.
Then, similarly to the first embodiment, when the ON / OFF command J ₁ is ON, the selected operating speed K _R is, and when it is OFF, the operating speed K ₀ is respectively the speed control unit 114.
Is given to.

The function selection unit 112 also has a timer function, and operates with the ON / OFF command J ₁ as a trigger. The timer 112e schematically shows this function.

When the ON / OFF command J ₁ is switched from ON to OFF, the state of the timer 112e is initialized to the state S0. When initialized to the state S0, the values of the timer flags F0 and F1 are initialized to 0, and the timer M0 starts measuring time.

The timer M0, when the timer time T0 set by the setting unit 111 elapses after the start of time counting,
The value of the timer flag F0 is set to 1. When the timer flag F0 is 0, the state S0 is maintained, and when the value of the timer flag F0 is set to 1, the state of the timer 112e transits to the state S1.

With the transition to the state S1, the value of the timer flag F0 is initialized to 0, and the timer M1 starts counting time. After the timer M1 starts its timing, the setting unit 111
When the set timer time T1 has elapsed, the value of the timer flag F1 is set to 1. Timer flag F1
Is 0, the state S1 is maintained and the timer flag F1
If the value of is set to 1, the state of the timer 112e transits to the state S0. With the transition to the state S0, the value of the timer flag F1 is initialized to 0, and the timer M0 restarts counting time.

By such an operation, the timer 112e
The states of S0 and S1 are timer time T0,
Only T1 is maintained, and the transition between the two is sequentially repeated. The timer 112e outputs the value of the mode signal TDMOD1 as 0 and 1 corresponding to the states S0 and S1, respectively. Corresponding to the values of the mode signal TDMOD1 being 0 and 1, the operating speed K _R is set to K ₁ and K ₂ , respectively.

With this operation, an ON / OFF command is issued.
J₁Is ON, the speed control unit 114
For 115, run rotation with the length of timer time T0
Number K ₁Drive and driving operation with the length of timer time T1
Number of turns K₂And driving are sequentially repeated. Therefore, wash
Cleaning time when chips etc. to be removed come in the cleaning area
Even if you don't know the
Supply fluid for cleaning and reduce power consumption
be able to. Of course, the operation can be stopped.

E. Third embodiment. In this embodiment, the operation of the function selection unit 112 when the multi-flow rate operation 83 is selected by the function selection unit 112 will be described. The present embodiment is an operation corresponding to the case where the required amount of cutting fluid differs depending on the content of cutting work.

FIG. 6 shows the function selection unit 1 in this embodiment.
12 is a block diagram showing the outline of the operation of 12. FIG. From the main engine 90, an ON / OFF command J ₁ for instructing start / stop and a flow rate selection command J ₂ for selecting a flow rate are given as operation information J.
On the other hand, from the setting unit 111 in advance, four kinds of operating speeds K ₀ (=
0), K ₁ (> 0), K ₂ (> K ₁ ) and K ₃ (> K ₂ ) are given.

_{One of} the operating speeds K ₁ , K ₂ and K ₃ is selected by the flow rate selection command J ₂ as the selected operating speed K _S (S = 1, 2 or 3). Switch 11
2d schematically shows this switching. And the first
The ON / OFF command J ₁ is O
In the case of N, the selected operating speed K _S , and in the case of OFF, the operating speed K ₀ (= 0), respectively.
Is given to.

By such an operation, the speed controller 114
ON / OFF command J for motor 115₁Driving times according to
Number of turns K_STo drive or stop. This driving times
Number of turns K _SIs the flow rate selection command J₂It is selected according to. Obey
Cut at a flow rate that is appropriately selected according to the cutting process.
Since cutting fluid can be supplied or stopped, waste of cutting fluid is avoided.
Can be avoided. Especially ON / OFF command J₁And flow rate
Selection command J₂Since and are separately provided, they are suitable for certain processing.
Flow rate selection command J to set the specified flow rate₂Give the current
Flow rate selection command J₂Separately from
ON / OFF command J₁Can be controlled with.

F. Fourth Embodiment. In this embodiment, the operation of the function selecting unit 112 when the slip detection control 84 is selected by the function selecting unit 112 will be described. In this embodiment, the cutting fluid returned from the main machine is temporarily stored in the primary tank 91,
The operation of the function selection unit 112 when pumping up to the processing tank 92 for removing chips will be described. In the present embodiment, idling is avoided without detecting the level of the cutting fluid in the primary tank.

FIG. 7 is a flow chart showing an outline of the operation of this embodiment. After startup, normal operation is performed in step S11, and step S11 is repeated and executed until a load change is detected in step S12. If the load fluctuation is detected in step S12,
When it is determined that the idling has started, the process proceeds to step S13, and the motor rotation speed is reduced. After that, the operation in the state where the motor rotation speed is reduced continues until the timer count-up occurs in step S14. When the timer count-up occurs in step S14, the process returns to step S11, and the normal operation is performed again.

FIG. 8 shows the function selecting section 1 in this embodiment.
12 is a block diagram showing the outline of the operation of 12. FIG. From the main engine 90, an ON / OFF command J ₁ that gives an instruction to start and stop is given as operation information J. On the other hand, three kinds of operating speeds K ₀ (= 0), K ₁ (> 0) and K ₂ (> K ₁ ) are given in advance from the setting unit 111. Also, the timer time T1 is set. Further, the motor current measurement command J ₃ is also given from the setting unit 111.

The motor current I _M is given not only to the feedback to the speed control unit 114 but also to the function selection unit 112 so as to be used for the idling detection control. During normal operation, the pump body 113 sucks up a predetermined fluid, such as cutting fluid, so that a predetermined load is applied to the motor 115. As a result, the motor current I _M has a value larger than the predetermined threshold I _th . However, when the motor 115 starts idling to rotate, its load fluctuates, specifically, becomes lighter. As a result, the motor current I _M takes a value smaller than the threshold I _th . Therefore, in order to execute the load fluctuation detection in step S12, when the idling detection control is selected in the function selection unit 112, the motor current I _M is measured based on the motor current measurement command J ₃ , and the value of the threshold value I _th is determined. The result G is obtained by comparing with.

The idling detection function 112g schematically shows the above comparison in a flow chart. Here is the comparison result G
Takes values of 0 and 1 and are set corresponding to the case where the value of the motor current I _M is larger and smaller than the threshold value I _{t h} , respectively. The idling detection function 112g starts its operation when the ON / OFF command J ₁ is switched from OFF to ON. This is because when the motor 115 is stopped, the measurement of the motor current I _M is unnecessary.

The function selection unit 112 also has a timer function, and operates with the ON / OFF command J ₁ as a trigger. The timer 112h schematically shows this switching.

When the ON / OFF command J ₁ is switched from ON to OFF, the state of the timer 112h is initialized to the state S0. When initialized to the state S0, the value of the timer flag F2 is initialized to 0.

While the value of the comparison result G is 0, that is, when the value of the motor current I _M is larger than the predetermined threshold value I _{th and the} normal operation is performed, the state S0 is maintained. However, when the value of the comparison result G becomes 1, that is, when the motor current I _M changes from a value larger than the predetermined threshold value I _{t h} to a smaller value, the timer 112 _h is triggered.
State changes to state S1.

The transition to the state S1 causes the timer M1 to start counting time. The timer M1 is set by the setting unit 1 after the time measurement.
When the set timer time T1 has elapsed from 11, the value of the timer flag F2 is set to 1. If the timer flag F2 is 0, the state S1 is maintained, and if the value of the timer flag F2 is set to 1, the state of the timer 112h transits to the state S0. The value of the timer flag F2 is initialized to 0 by the transition to the state S0, and the comparison result G
Based on the above, the state of the timer 112h becomes one of the states S0 and S1.

By such operation, the timer 112h
When the value of the motor current I _M transits from a state in which the value of the motor current I _M is larger than a predetermined threshold value I _th to a state in which the value is smaller, the state S1 is maintained for the timer time T1. In other cases, the state S0 is maintained. And the timer 112h is in state S
Corresponding to 0 and S1, the value of the mode signal TDMOD2 is output as 0 and 1, respectively.

In the same manner as the second embodiment, the operation rotation
Number K₁, K₂One is the operating speed K _R(R = 1, 2
As one of the deviations, depending on the value of the mode signal TDMOD2,
Is selected. The value of the mode signal TDMOD2 is 0, 1
Corresponding to that, the operating speed K_RRespectively
K₁, K₂Is set to. Switch 112f is this switching
This is schematically shown. The same as in the first embodiment
Similarly, ON / OFF command J₁When is ON, drive
Speed K_RHowever, when it is OFF, the operating speed K₀(= 0)
Are provided to the speed control unit 114, respectively.

With such an operation, when the ON / OFF command J ₁ is ON, the speed control unit 114 keeps the motor 115 for the length of the timer time T2 from the time when it is determined that the idling has occurred. Driving at operating speed K ₂ (corresponding to repetition of steps S13 and S14 in FIG. 7) and driving at operating speed K ₁ in other cases (corresponding to the loop formed by steps S11 and S12) I do. Since K ₁ > K ₂ , the motor 115 when idling
The damage of can be reduced. Moreover, when the timer time T1 elapses, the driving is automatically performed at the original operating speed K ₁ . Since idling is detected based on the value of the motor current I _M , a sensor for detecting the liquid level is unnecessary. Of course, the operation can be stopped.

Further, the threshold value I _th , which is a reference for obtaining the comparison result G, may have a predetermined width. For example, ΔI ₁ (>
0) and Δ ₂ (> 0) are set, and the comparison result G corresponds to the change from the state where I _M is smaller than I _th + Δ ₁ to the state where I _M is larger than I _th + Δ _1.
The value of is changed from 1 to 0, and the comparison result G corresponds to the change from a state in which I _M is larger than I _th −Δ ₂ to a state in which I _M is smaller than I _th −Δ _2.
The value of can be changed from 0 to 1.

[0090]

According to the first aspect of each of the pump, the pump control method, and the motor control device according to the present invention,
Since the drive is controlled by the inverter control, the motor (115) and hence the pump body (113) are adapted to the function selected from the plurality of functions (81 to 84).
Can be driven.

According to the second aspect of each of the pump, the pump control method, and the motor control device according to the present invention,
Since start / stop is performed by an ON / OFF command (J ₁ ) from the outside, the life of mechanical contacts such as a magnet switch is not impaired during start / stop operation.

According to the third aspect of each of the pump, the pump control method, and the motor control device according to the present invention,
Even when the cleaning timing is unknown, it is possible to intermittently operate the pump to supply the fluid for cleaning and reduce the power consumption.

According to the fourth aspect of each of the pump, the pump control method, and the motor control device according to the present invention,
Since the fluid can be supplied at a flow rate appropriately selected according to the operation, waste of the fluid can be avoided.

According to the fifth aspect of each of the pump, the pump control method, and the motor control device of the present invention,
Damage to the motor (115) during idling can be reduced.

According to the sixth aspect of each of the pump, the pump control method, and the motor control device of the present invention,
No sensor is required to detect the liquid level.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a configuration of a pump usable in the present invention.

FIG. 2 is a graph showing a relationship between a flow rate Q and a head H.

FIG. 3 is a block diagram showing a configuration adopted in the embodiment of the present invention.

FIG. 4 is a block diagram showing an outline of operation of the first embodiment.

FIG. 5 is a block diagram showing an outline of operation of the second embodiment.

FIG. 6 is a block diagram showing an outline of operation of the third embodiment.

FIG. 7 is a flowchart showing an outline of operation of the fourth embodiment.

FIG. 8 is a block diagram showing an outline of operation of the fourth embodiment.

FIG. 9 is a block diagram showing a conventional technique.

[Explanation of symbols]

81 Start / Stop Function 82 Intermittent Operation 83 Multi-Flow Operation 84 Idling Detection Control 100 Pump 111 Selection Setting Section 112 Function Selection Section 112e, 112h Timer 112g Idling Detection Function 113 Pump Main Body 114 Speed Control Section 115 Motor I _M Motor Current I _th Threshold J ₁ ON / OFF command J ₂ Flow rate selection command K ₀ , K ₁ , K ₂ , K ₃ , K ₄ Operating speed K _R , K _S Selected operating speed T 0, T 1 Timer time

Claims (34)

[Claims] 1. A motor (115) and a pump body (113) driven by the motor.
And a speed control unit (114) that employs inverter control to control the number of rotations of the motor, and a plurality of functions (81 to 84). The operation of the speed control unit is performed based on the selected function. A function selection unit (112) for setting, and a selection setting unit (11) for selecting a function from the plurality of functions.
1) and a pump (100). 2. The plurality of functions have a start / stop function (81), and when the start / stop function is selected, the setting unit (111) selects an operating speed (K ₁ ) as the function. When the ON / OFF command (J ₁ ) from the outside of the pump (100) is ON, the inverter control is performed based on the operating speed, and the ON / OFF command is given to the section (112). The pump according to claim 1, wherein the rotation of the motor (115) is stopped when the motor is off. 3. The setting unit (111) sets a second operating speed (K ₀ ) whose value is zero to the function selecting unit (11).
2), the function selecting unit instructs the speed control unit (114) to respond to the ON / OFF command (J ₁ ) being ON and OFF, respectively, to the operating speed (K ₁ ), The second
The pump (100) according to claim 2, wherein the operating speed (K ₀ ) of the pump is provided. 4. The plurality of functions have an intermittent operation (82), and when the intermittent operation is adopted, the setting unit (111) has a plurality of operation speeds (K ₁ , K ₂ ).
Is given to the function selection unit (112), and when the ON / OFF command (J ₁ ) from the outside of the pump (100) is ON, the selected operation rotations sequentially selected from the plurality of operation rotation speeds. The pump according to claim 1, wherein the inverter control is performed based on a number (K _R ). 5. The setting unit (111) includes a plurality of periods (T0, T) corresponding to the plurality of operating speeds (K ₁ , K ₂ ).
1) is given to the function selection unit (112), and the function selection unit receives the ON / OFF command (J ₁ ) O
The state is initialized by switching from N to OFF (S
0) and has a timer function (112e) having a plurality of states (S0, S1) that are sequentially maintained in each of the plurality of periods and sequentially transit to each other, and the function selector selects the speed controller (114). ,
The pump (100) according to claim 4, wherein the selected operating speed (K _R ) corresponding to the state of the timer function is given. 6. The ON / OFF command (J ₁ ) is OFF.
In the case of, the rotation of the motor (115) is stopped,
A pump (100) according to any one of claims 4 and 5. 7. The plurality of functions have a multi-flow rate operation (83), and when the multi-flow rate operation is adopted, the setting unit (111) causes a plurality of operation speeds (K ₁ , K _2). ,
K ₃ ) is given to the function selection unit (112), and a selected operating speed (J ₂ ) selected from the plurality of operating speeds based on a flow rate selection command (J ₂ ) given from the outside of the pump (100). The pump according to claim 1, wherein the inverter control is performed based on K _S ). 8. The idling detection control (84) for the plurality of functions.
When the idling detection control is adopted, the setting unit (111) has a plurality of operating speeds (K ₁ , K ₂ ,
K ₃ ) is given to the function selection unit (112) and a predetermined period (T1, S1) after the idle rotation is detected (S12).
In (4), one having a relatively small value (K ₂ ) from the plurality of operating speeds (S 13) and one having a relatively large value from the plurality of operating speeds other than the predetermined period (S 13). K
The pump (100) according to claim 1, wherein the inverter control is performed on the basis of a selected operating speed (K _R ) obtained by selecting ₁ ) in step S11. Wherein said idling, the motor current of the motor (115) (I _M) is detected with a smaller than a predetermined threshold value (I _th) (112 g), a pump according to claim 8 (100) . 10. The setting unit (111) provides the predetermined period (T1) to the function selection unit (112), and the function selection unit sets the motor current (I _M ) to the predetermined threshold value (I _M ). The pump (10) according to claim 9, wherein timing of the predetermined period is started (S14, 112h) triggered by a transition from a value larger than _th ) to a smaller value.
0). 11. O from the outside of the pump (100)
N / OFF command (J ₁) Is OFF, the motor
Claim 7 thru | or Claim 1 which stops rotation of (115).
The pump according to any one of 0. 12. The setting unit (111) sets another operating speed (K ₀ ) whose value is zero to the function selecting unit (11).
2), the function selection section instructs the speed control section (114) to select the operating speed (K ₁ ) depending on whether the ON / OFF command (J ₁ ) is ON or OFF. _R ,
K _S ), the pump (100) according to any one of claims 6 and 11, providing said other operating speed. 13. A pump control for controlling the number of rotations of a motor (115) for driving a pump body (113) by adopting an inverter control based on a function selected from a plurality of functions (81 to 84). Method. 14. The plurality of functions have a start / stop function (81), and when the start / stop function is selected, when a ON / OFF command (J ₁ ) from the outside is ON, The pump control method according to claim 13, wherein the inverter control is performed on the basis of the operating rotation speed (K ₁ ) of ₁ and the rotation of the motor (115) is stopped when the ON / OFF command is OFF. 15. The plurality of functions have an intermittent operation (82), and when the intermittent operation is adopted, a plurality of functions are provided when an external ON / OFF command (J ₁ ) is ON. The pump control method according to claim 13, wherein the inverter control is performed based on a selected operating speed (K _R ) sequentially selected from the operating speeds (K ₁ , K ₂ ). 16. A plurality of periods (T0, T1) corresponding to the plurality of operating speeds (K ₁ , K ₂ ) are set, and the ON / OFF command (J ₁ ) is switched from ON to OFF. The state is initialized (S0), a plurality of states (S0, S1) that are respectively maintained and sequentially transitioned in the plurality of periods are set, and the selected operation rotation speed (K _R corresponding to the plurality of states is set. )
16. The inverter control is performed based on
The described pump control method. 17. The ON / OFF command (J ₁ ) is OF
The pump control method according to claim 15, wherein in the case of F, the rotation of the motor (115) is stopped. 18. The plurality of functions is a multi-flow operation (83).
When the multi-flow rate operation is adopted, a plurality of operating speeds (K ₁ , K ₂ , K ₃ ) are selected based on a flow rate selection command (J ₂ ) given from the outside. 14. The pump control method according to claim 13, wherein the inverter control is performed based on the selected operating speed (K _S ). 19. The slip detection control (8)
4) and when the idling detection control is adopted, a predetermined period (T1, S1) after the idling is detected (S12).
4) a plurality of working rotational speed _{(K 1, K 2, K} 3) of relatively what value is smaller from the (K ₂₎ (S13), among the plurality of operating rotational speed other than the predetermined period 14. The pump control method according to claim 13, wherein the inverter control is performed on the basis of a selected operating speed (K _R ) obtained by selecting a relatively large value (K ₁ ) from (S11). 20. The idling, the motor current (I _M) is detected with a smaller than a predetermined threshold value (I _th) (112 g), pump control method according to claim 19, wherein said motor (115). 21. Timing of the predetermined period is started upon the transition of the motor current (I _M ) from a value larger than the predetermined threshold value (I _th ) to a small value (S14, 112h). ), The pump control method according to claim 20. 22. An ON / OFF command (J ₁ ) from the outside
22. The pump control method according to claim 17, wherein the rotation of the motor (115) is stopped when is OFF. 23. A speed control unit (114) for controlling the number of rotations of a motor (115) for driving a pump body (113) by adopting an inverter control, and a plurality of functions (81-84) are provided. A function selection unit (112) that sets the operation of the speed control unit based on the selected function, and a selection setting unit (11) that selects a function from the plurality of functions.
1) A motor control device comprising: 24. The plurality of functions has a start / stop function (81), and when the start / stop function is selected, the setting unit (111) selects an operating speed (K ₁ ) as the function selection. When the external ON / OFF command (J ₁ ) is ON, the inverter control is performed based on the operating speed, and when the ON / OFF command is OFF, the inverter control is performed. 24. The motor control device according to claim 23, wherein the rotation of the motor (115) is stopped. 25. The setting unit (111) sets a second operating speed (K ₀ ) whose value is zero to the function selecting unit (11).
2), the function selecting unit instructs the speed control unit (114) to respond to the ON / OFF command (J ₁ ) being ON and OFF, respectively, to the operating speed (K ₁ ), The second
24. The motor control device according to claim 23, which provides the operating speed (K ₀ ) of 1. 26. The plurality of functions have an intermittent operation (82), and when the intermittent operation is adopted, the setting unit (111) has a plurality of operation speeds (K ₁ , K ₂ ).
Is given to the function selection unit (112), and when the ON / OFF command (J ₁ ) from the outside is ON, the selected operating speed (K _R ) is sequentially selected from the plurality of operating speeds. The motor control device according to claim 23, wherein the inverter control is performed based on the inverter control. 27. The setting unit (111), said plurality of working rotational speed (K _1, K ₂₎ a plurality of period corresponding to (T0,
T1) is given to the function selection unit (112), and the function selection unit receives the ON / OFF command (J ₁ ) as O.
The state is initialized by switching from N to OFF (S
0) and has a timer function (112e) having a plurality of states (S0, S1) that are sequentially maintained in each of the plurality of periods and sequentially transit to each other, and the function selector selects the speed controller (114). ,
27. The motor control device according to claim 26, wherein the selected operating speed (K _R ) corresponding to the state of the timer function is given. 28. The ON / OFF command (J ₁ ) is OF
28. The motor control device according to claim 26, wherein in the case of F, the rotation of the motor (115) is stopped. 29. The plurality of functions is a multi-flow operation (83).
When the multi-flow rate operation is adopted, the setting unit (111) has a plurality of operating speeds (K ₁ , K ₂ ,
K ₃ ) to the function selection unit (112), and the selected operating speed (K) selected from the plurality of operating speeds based on the flow rate selection command (J ₂ ) given from the outside.
24. The motor control device according to claim 23, wherein the inverter control is performed based on _S ). 30. The idling detection control (8) is provided for the plurality of functions.
4) and when the idling detection control is adopted, the setting unit (111) has a plurality of operating speeds (K ₁ , K ₂ ,
K ₃ ) is given to the function selection unit (112) and a predetermined period (T1, S1) after the idle rotation is detected (S12).
In (4), one having a relatively small value (K ₂ ) from the plurality of operating speeds (S 13) and one having a relatively large value from the plurality of operating speeds other than the predetermined period (S 13). K
24. The motor control device according to claim 23, wherein the inverter control is performed on the basis of the selected operating speed (K _R ) obtained by selecting ₁ ) in step S11. 31. The idling, the motor current of the motor (115) (I _M) is detected with a smaller than a predetermined threshold value (I _th) (112g), the motor control device according to claim 30, wherein. 32. The setting unit (111) provides the predetermined period (T1) to the function selection unit (112), and the function selection unit sets the motor current (I _M ) to the predetermined threshold value (I _M ). 32. The motor control device according to claim 31, wherein timing of the predetermined period is started (S14, 112h) triggered by a transition from a value larger than _th ) to a smaller value. 33. An ON / OFF command (J ₁ ) from the outside
33. The motor control device according to claim 29, wherein the rotation of the motor (115) is stopped when is OFF. 34. The setting unit (111) sets another operating speed (K ₀ ) whose value is zero to the function selecting unit (11).
2), the function selection section instructs the speed control section (114) to select the operating speed (K ₁ ) depending on whether the ON / OFF command (J ₁ ) is ON or OFF. _R ,
34. The motor control device according to claim 28, further comprising: K _s ) and the other operating speed.