JPH0817591B2 - Rotation speed control device for fan etc. - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation speed control device for changing and controlling the rotation speed of a rotary load such as a blower fan provided in an air conditioner having a large amount of inertia.

2. Description of the Related Art As such a rotation speed control device, a gear shift operation of at least other gear stages except at least a minimum gear stage is performed between a rotary load and an electric motor for rotationally driving the load by engaging a hydraulically operated friction clutch. The one having a stepped transmission arranged so as to obtain it is already known as disclosed in, for example, JP-A-55-152338 or JP-A-56-143651.

Each of the above-mentioned publications has the same device structure for a rotating load having a large inertial amount such as a fan and a rotating load having a small inertial amount such as a cooling water pump.

Problems to be Solved by the Invention By the way, regarding the work to be performed by the friction clutch when the rotational speed of the rotational load is changed between the low rotational speed n ₁ and the high rotational speed n ₂ due to shift up and down of the transmission. Considering this, this is related to the brake torque T ₁ due to the rotation of the rotary load and the torque T ₂ for acceleration or deceleration. The brake torque T ₁ opposes an increase in rotational speed during shift up and contributes to a decrease in rotational speed during downshift. Therefore, the work amounts Wu and Wd of the friction clutch during shift up and downshift are respectively expressed by the following equations.

Wu ＝ T ₁ ＋ T ₂ ………… Wd ＝ T ₂ −T ₁ ………… Therefore, the work of the friction clutch becomes larger at the time of shift up compared with the time of downshift. When the torque T ₂ for acceleration or deceleration is I, the moment of inertia of the rotating load, Therefore, in the case of a rotational load with a large amount of inertia, it becomes extremely large.

For this reason, the conventional system, in which the rotational speed is controlled by the device having the same structure, is the same for the rotating load with a large inertial amount such as a fan and the rotating load with a small inertial amount such as a cooling water pump. If a friction clutch with a large capacity is used, there will be no problem with a rotational load with a small amount of inertia.However, if a rotational load with a large amount of inertia is used, the friction element will slip at the time of shift up of the transmission and an abnormal noise will be generated. This resulted in heavy wear.

Therefore, conventionally, in order to control the rotational speed of a rotational load having a large inertial amount, a large-capacity friction clutch with a capacity larger than that of the electric motor has been used.

Therefore, the present invention is intended to provide a novel rotation speed control device that reduces the work of the friction clutch at the time of shift up and can use a small capacity friction clutch.

Technical Means Taken to Solve the Problems In order to solve the problems of the present invention, the present invention controls the operation of a friction clutch by hydraulic pressure supply / discharge control in a rotation speed control device including a transmission as described above. A technical measure was taken to provide an electric motor start / stop control circuit section for cutting off the electric power of the electric motor for a short time only when a shift-up command signal for instructing a shift-up of the transmission is input to the operation control circuit of the solenoid valve.

In the embodiment described later, a multi-plate hydraulic clutch is used as the friction clutch, but other types of hydraulically-actuated friction such as a cone clutch or a dry multi-plate clutch which is operated by a separately installed hydraulic cylinder via a lever. Clutch may be used. Further, in the embodiment, the gear shifting operation of the lowest speed gear is obtained by the one-way clutch, but the gear shifting operation of the lowest speed gear may be obtained by a hydraulically operated friction clutch.

Effect According to the present invention, the electric power of the electric motor is temporarily cut off when the transmission is shifted up, so that the electric motor can be freely rotated by external driving. When the frictional clutch on the high-speed gear side is engaged and shift up is performed under the condition that the rotational load with a large amount of inertia continues to rotate due to inertia, the inertial rotation of the rotational load is transmitted to the electric motor. The electric motor will be rotated by an external drive.

Since the inertial body in an electric motor is only its rotating shaft and the coil (rotor) that surrounds it, the inertial amount of the electric motor is smaller than that of a fan or the like (1/100 to 1/100).
Therefore, according to the present invention, the electric motor is driven in reverse during shift up, in contrast to the conventional one in which a large inertial load such as a fan is driven during shift up. Is much smaller, and even small capacity clutches will not slip.

Practical Example FIGS. 1 and 2 show the first practical example.

As shown in FIG. 1, in an air conditioner equipped with a blower fan 2 driven by an electric motor 1, a transmission 3 is interposed between the electric motor 1 and the fan 2. The transmission 3 includes an input shaft 4 and an output shaft 5, and the motor 1 shaft and the input shaft 4 are interlockingly connected by a belt 6 and the output shaft 5 and the fan 2 shaft are interlockingly connected by a belt 7.

The transmission 3 includes a gear train at a low speed shift stage formed by meshing a gear 8 fixedly installed on the input shaft 4 with a gear 9 loosely fitted on the output shaft 5, and a gear loosely fitted on the input shaft 4. A gear train of a high speed shift stage, which is formed by meshing a gear wheel 10 and a gear wheel 11 fixedly installed on the output shaft 5, is provided. A one-way clutch 12 is arranged between the gear 9 and the output shaft 5, and the one-way clutch 12 is engaged when it is driven from the gear 9 side in the forward direction. A multi-plate hydraulic clutch 13 is arranged between the input shaft 4 and the gear 10 to connect the gear 10 to the input shaft 4 when engaged with the supply of hydraulic pressure. In the state where the output shaft 5 is rotating due to the operation of the high speed shift stage by the engagement of the hydraulic clutch 13, the one-way clutch 12 is relatively driven from the output shaft 5 side and idles. When the hydraulic clutch 13 is in the non-engaging state, the low speed shift stage and the high speed shift stage are engaged by engaging the hydraulic clutch 13 respectively.

The supply / discharge control of the hydraulic pressure to the hydraulic clutch 13 is performed by the solenoid valve 14 shown in FIG. As shown in the figure, this solenoid valve 14 is used to collect the oil discharged from the hydraulic clutch 13 in the oil tank 16
To the low speed position L leading to the
And a high speed position H for supplying the hydraulic clutch 13 with the hydraulic pressure set in. The pressure regulating valve 17 is of a well-known type of gradually increasing hydraulic pressure, and a secondary pressure regulating valve 18 for setting the hydraulic pressure of the lubricating oil supplied to the hydraulic clutch 13 etc. is provided on the secondary side of the synchronous pressure valve 17. .

The solenoid valve 14 is biased by a spring 14a so as to assume a high speed position H, and is moved to a low speed position L by exciting a solenoid SL. A controller 19 connected to the solenoid valve solenoid SL and the electric motor 1 is provided, and the solenoid valve 14 and the electric motor 1 are connected to the controller 19.
The operation is controlled by.

FIG. 2 shows an operation control circuit provided in the controller 19.

In the structure with multiple parallel circuits connecting both terminals of the power supply as shown in the figure, the sensor SE that detects the shift up time during automatic operation by the ON operation by detecting the temperature in the air-conditioned space is the first relay. It is inserted in the switching command signal circuit provided with CR1. The first switch SW ₁ that can switch between the low speed position L and the high speed position H during manual operation and the automatic operation position A is inserted into the manual low speed operation circuit provided with the second relay CR2. The switch SW1 is adapted to make the manual low speed operation circuit conductive only at the low speed position L. The automatic operation circuit provided with the third relay CR3 operates in conjunction with the first switch SW ₁ to operate the switch S.
The second that makes the automatic operation circuit conductive only at the automatic position of W ₁
The switch SW ₂ is inserted. Motor power-off confirmation circuit provided with the first timer TR1, motor power supply re-entry circuit provided with the second timer TR2, solenoid excitation circuit provided with the fifth relay CR5, solenoid circuit in which the solenoid SL is inserted. Are also provided respectively, and the contacts of each relay and the contacts opened and closed by the operation of each timer are inserted in the above circuit as follows.

That is, first, the normally open contact CR3b of the third relay CR3 is inserted in the switching command circuit. The motor power-off confirmation circuit includes a normally open contact CR3b of the third relay CR3 connected in series, a normally open contact CR1b of the first relay CR3, a normally closed contact CR3a of the third relay CR3 connected in series, and a second contact of the second relay CR3. Relay CR2 normally closed contact
CR2a and CR2a are inserted in parallel with each other. A contact TR1b which is turned on after the first timer TR1 is activated when the first timer TR1 is started and is kept on while the timer TR1 is energized is inserted in the motor power re-input circuit. When the second timer TR2 is activated in the motor power supply closed circuit, the contact TR2b is turned on after the timer is turned on and the ON state is maintained while the timer TR2 is energized.
, The normally open contact CR2b of the second relay CR2, the normally open contact CR3b of the third relay CR3 connected in series, and the normally closed contact CR1a of the first relay CR1 connected in parallel with each other and then inserted. There is.
The normally open contact CR2 of the second relay CR2 is included in the solenoid excitation circuit.
b, the normally open contact CR5b of the fifth relay CR5, the normally open contact CR3b of the third relay CR3 connected in series, and the normally closed contact CR1a of the first relay CR1 are connected in parallel with each other and then At the same time, the contact TR1a is inserted which is turned off after the first timer TR1 is activated and is kept off while the timer TR1 is energized. The normally open contact CR5b of the fifth relay CR5 is inserted in the solenoid circuit.

It should be noted that the power supply display circuit in which the lamp Lm indicating the power is turned on is inserted, the low speed operation display circuit in which the lamp Ll indicating the low speed operation state and the normally open contact CR5b of the fifth relay CR5 are inserted, and the high speed operation state are displayed. There is also provided a high speed operation display circuit in which a lamp Lh for displaying and a normally closed contact CR5a of the fifth relay CR5 are inserted.

Similarly, as shown in FIG. 2, the coil MC of the electric motor 1 is provided so as to be disconnected from the power source when the normally open contact CR4b of the fourth relay CR4 is off.

The operation of the operation control circuit shown in FIG. 2 will be described. The second relay CR2 is excited in the state where the first switch SW1 is operated at the low speed position L in the manual low speed operation. Therefore, the normally open contact CR2b is on and the fourth relay CR
Since 4 is also excited, the motor coil MC is excited and the electric motor 1 is rotated by turning on the normally open contact CR4b. Also, since the normally open contact CR2b of the second relay CR2 is on, the fifth relay CR2 is also excited, so the normally open contact CR5b
When the solenoid is turned on, the solenoid SL is excited and the solenoid valve 14 takes the low speed position L.

As described above, the transmission 1 is in a state in which the low speed shift stage is in a gear shift operation, and the fan 2 is driven at a low rotation speed.

Next, when the first switch SW ₁ is moved to the high speed position H to shift up the transmission 3, the manual low speed operation circuit is turned off and the second relay CR2 is demagnetized, which causes the contact CR2.
When b is turned off, the fourth relay CR4 is also demagnetized. Therefore, contact
When CR4b is turned off and power supply to the electric motor 1 is cut off, the electric motor 1
Is driven to rotate by inertia from the fan 2 side. At this point, the fifth relay CR5 is kept in the excited state by the self-holding action of the normally open contact CR5b, and the solenoid SL is still kept in the excited state. Then, according to the demagnetization of the second relay CR2, the first contact is made via the contact CR2b which is moved to the ON state and the contact CR3a which is kept in the ON state.
Since the timer TR1 of is energized, the timer TR1 of
Will start.

When the first timer TR1 is timed up, the timer contact TR1a in the solenoid excitation circuit is turned off, so the fifth relay CR5 is demagnetized and the contact CR5b is turned off to demagnetize the solenoid SL and the solenoid valve 14 is operated at high speed. It is moved to the position H and the supply of hydraulic pressure to the hydraulic clutch 13 is started. Further, since the timer contact TR1b of the motor power reclosing circuit is turned on by the time-up of the first timer TR1, the second timer TR2 is activated.

The second timer TR2 is set for about 10 seconds, and the timer contact TR2b in the motor power supply switching circuit is turned on according to the time-up, so the fourth relay CR4 is excited and relayed. Contact CR4b turns on, and motor 1
Is started again and the number of rotations is increased. Hydraulic pressure increasing type pressure regulating valve
The hydraulic clutch 13 is used to gradually increase the working hydraulic pressure to the normal hydraulic pressure for engaging engagement without shocks.
Will enter a complete engaging state by the time the motor 1 is restarted.

When the first switch SW1 is manually moved from the high speed position H to the low speed position L, the second relay CR2 is excited thereby, and the relay contact CR2b is turned on to keep the excitation state of the fourth relay CR4. Therefore, the power supply to the electric motor 1 is not cut off.

In the automatic operation based on the temperature detection result in the air-conditioned space by the sensor SE, the first switch SW ₁ is operated at the automatic operation position A
Then, the second switch SW ₂ is turned on and the relay CR 3 of the automatic operation circuit is excited.

During automatic low speed operation when the sensor SE is off, the relay contacts CR3b and CR1a are on, so the motor power supply switching circuit and solenoid excitation circuit are energized, respectively, and the fourth relay CR4 and the fifth relay CR5 is excited respectively. Therefore, the relay contact CR4b is turned on, the electric motor 1 is rotating, the relay contact CR5b is turned on, the solenoid SL is excited, the solenoid valve 14 is in the low speed position L, and the fan 2 rotates at low speed.

When the sensor SE is turned on, the first relay CR1 is excited. Therefore, when the contact CR1a is turned off, the power supply to the motor power supply switching circuit is cut off and the electric power supply to the motor 1 is stopped, and when the relay contact CR1b is turned on, the first relay CR1b is turned on. Timer TR1 starts. At this time, although the relay contact CR1b is turned off, the self-holding action of the relay contact CR5b still causes the fifth relay.
The excitation state of CR5 continues, the solenoid SL is excited, and the solenoid valve 14 is kept at the low speed position L, as in the case of manual operation.

By the time-up of the first timer TR1, its contact point T
R1b is turned on to activate the second timer TR2, and timer contact TR1a is turned off to cause the fifth relay CR5.
Is demagnetized and the solenoid SL is de-energized and the solenoid valve 14 is moved to the high speed position H, which is the same as when the manual low speed operation is switched to the high speed operation. Also, as in the case of manual operation, the contact TR2b is turned on by the time-up of the second timer TR2, the fourth relay CR4 is excited, the electric motor 1 is restarted, and the hydraulic pressure shown in FIG. Clutch 13 completes the engagement.

As is clear from the above description, in the operation control circuit shown in FIG. 2, the motor power supply switching circuit, the motor power supply off confirmation circuit, and the motor power supply reclosing circuit are the first switch SW.
₁ is moved from manual low speed position L to high speed position H
Relay CR2 is demagnetized or sensor SE is
Is turned on to excite the first relay CR1, and when a shift-up signal is input, the power supply of the electric motor 1 is turned off for a short time. The motor power-off confirmation circuit is only for confirming the motor power-off, and the time set in the first timer TR1 may be 0 seconds, and may be replaced with a relay accordingly.

It goes without saying that each of the above-mentioned lamps Lm, Ll, Lh functions to light up when required to notify the corresponding state.

FIGS. 3 and 4 show a second embodiment relating to the case where the transmission 3 has three gear stages.

As shown in FIG. 3, the transmission 3 is provided with a gear train of a medium-speed shift stage, which is formed by meshing a gear 21 loosely fitted on the input shaft 4 and a gear 22 fixedly installed on the output shaft 5. This medium-speed gear stage is a multi-plate hydraulic clutch 23 provided on the input shaft 4.
Is operated by selectively connecting the gear 21 to the input shaft 4.

The hydraulic pressure supply / discharge control for the hydraulic clutch 13 for the high speed shift stage and the hydraulic clutch 23 for the medium speed shift stage is performed by two solenoid valves 14I, 14II connected in series in the clutch lubrication direction. The solenoid valve 14I has a spring 14I
The high-speed position H, which is moved by a force, is changed to the solenoid valve
Is a medium speed position M which is transferred by the force of spring 14IIa,
Each is provided. The front-stage solenoid valve 14I is provided with another position I for discharging oil from the hydraulic clutch 13 and supplying oil to the rear-stage solenoid valve 14II, and the rear-stage solenoid valve 14I.
II is provided with another position II that causes oil to drain from the hydraulic clutch 23. Therefore, if both solenoid valves 14I and 14II are moved to the above-mentioned other positions I and II, both hydraulic clutches 13 and 23 are deactivated, and the transmission 3 is operated at a low speed by the engagement of the one-way clutch 12. It The solenoid valves 14I, 14II are moved to the other positions I, II by exciting the solenoids SL1, SL2.

The structure of the other parts shown in FIG. 3 is the same as the corresponding parts shown in FIG.

FIG. 4 shows an operation control circuit for the solenoid valves 14I and 14II. First, in the circuit, relays CRL, CRM, CRH and C are respectively provided.
A manual low speed operation circuit, a manual middle speed operation circuit, a manual high speed operation circuit and an automatic operation circuit provided with RA are provided. Switches SWL and SW are connected to these circuits and are switched in tandem to selectively excite relays CRL, CRM, CRH and CRA.
M, SWH and SWA are inserted.

A medium speed switching command signal circuit and high speed switching command signal circuit equipped with relays CR1 and CR2 for generating switching signals for medium speed and high speed during automatic operation are also provided. Each relay by detecting the temperature inside
Sensors SEM and SEH that excite CR1 and CR2 are inserted.
These switching command signal circuits are connected to the power supply via the normally open contact CRAb of the relay CRA of the automatic operation circuit so that they operate only during automatic operation.

Command confirmation first circuit for confirming switching command from low speed to medium speed or high speed is equipped with relay CR3, and command confirmation second circuit for confirming switching command from medium speed to high speed is relay CR4. Prepare The command confirmation first circuit includes the normally open contacts CR1b, CR2b of the relays CR1, CR2 of both switching command signal circuits and the relays CRM, CRH of the manual middle speed and high speed circuits.
CRHb are connected in parallel with each other and inserted, and the command confirmation first circuit is connected to a power source through a normally open contact CR6b of a relay CR6 of a low speed holding circuit described later. The command confirmation second circuit has a normally open contact C of the relay CR2 of the high speed switching command signal circuit.
R2b and the normally open contact CRHb of the relay CRH of the manual high speed operation circuit are inserted in parallel with each other, and the second circuit for confirming the command is a normally open contact CR7b of the relay CR7 of the medium speed holding circuit described later.
Connected to the power supply via.

A motor power-off command circuit having a relay CR5 and a motor power-off confirmation circuit having a first timer TR1 are provided, and both circuits are provided with command confirmation first and second commands.
When at least one of the normally open contacts CR3b, CR4b of the relays CR3, CR4 of the circuit is turned on, it is supposed to be connected to the power supply, and the relay CR5 has its normally open contact CR5 for self-holding.
It is also connected to the power supply via b. The motor power-off command circuit has a normally closed contact TR2 of a second timer TR2, which will be described later.
a, that is, while the second timer TR2 is turned off by the time-up and the timer TR2 is energized,
A timer contact TR2a for connecting the OFF state is inserted.

Low speed holding circuit with relays CR6, CR7, CR8,
A medium speed holding circuit and a high speed holding circuit are provided, and the relays CR6, CR7, CR8 of each of these circuits are connected to the power supply in the fixed cases by the following contacts.

That is, first, as shown in the figure, the relay CR6 of the low speed holding circuit has the normally open contact CRA of the relay CRA of the automatic operation circuit and the normally open contact CRA of the relay CRL of the manual low speed operation circuit turned on.
b and the normally open contacts CR1a and CR2a of the relays CR1 and CR2 of the medium speed / high speed switching command signal circuit are all turned on and the relay C
The normally open contact CR6b of R6 maintains the ON state by the self-holding action, and the normally closed contacts C of the relays CR7 and CR8 of the medium speed and high speed holding circuits.
It is supposed to be connected to the power supply when both R7a and CR8a are on.

Next, in the relay CR7 of the medium speed holding circuit, the normally closed contact CR3a of the relay CR3 of the command confirmation first circuit is turned on and the normally open contact CRMb of the relay CRM of the manual middle speed operation circuit and the relay CR1 of the middle speed switching command signal circuit. When at least one of the normally open contacts CR1b of is ON, and the normally open contact C of the relay CR3 of the command confirmation first circuit
Low-speed and high-speed when R3b is turned on and the normally-open contact TR1b of the first timer TR1 is turned on (after the timer TR1 is activated, it is turned on by a time-up and then remains on while the timer TR1 is energized) The normally closed contacts CR6a and CR8a of the relays CR6 and CR8 in the holding circuit are both on and the relay C
It is to be connected to the power supply when the normally open contact CR7b of R7 is kept in the ON state by the self-holding action.

Furthermore, the relay CR8 of the high-speed holding circuit has the normally closed contact CR4a of the relay CR4 of the command confirmation second circuit turned on, and the normally closed contact CRHb of the relay CRH of the manual high-speed operation circuit and the normally open contact of the relay CR2 of the high-speed switching command signal circuit. When at least one of CR2b is turned on, the normally open contact CR8b of the relay CR8 is kept on by self-holding action and the normally closed contacts CR6a, CR7a of the relays CR6, CR7 of the low speed and medium speed holding circuits are It is supposed to be connected to the power supply when both are on.

The operation control circuit shown in FIG. 4 is further provided with a relay CR9.
There is provided a motor power supply opening / closing circuit provided with the above, and a motor power supply re-instruction circuit provided with a second timer TR2. These circuits include relays CR6, CR7, low speed, medium speed and high speed holding circuits.
When any one of the normally open contacts CR6b, CR7b, CR8b of CR8 is turned on and the normally closed contact CR5a of the motor power off command circuit CR5 is also turned on, the motor power is turned on again. The command circuit is energized when the normally-open contact TR1b of the first timer TR1 (after the timer TR1 is started, it is turned on at a time-up and thereafter remains in the ON state while the timer TR1 is energized). It is supposed to be done.

Then, the solenoids SL1 and SL2 of the both solenoid valves 14I and 14II
The first solenoid circuit and the second solenoid circuit are respectively inserted, and any of these solenoid circuits is disconnected from the power source when the normally closed contact CR8a of the relay CR8 of the high speed holding circuit is turned off. As a matter of fact.

In the first solenoid circuit, normally open contact C of relays CR6 and CR7 of the low speed and medium speed holding circuits when the contact CR8a is on.
When either R6b or CR7b is turned on, electricity is supplied, and when the relay contact CR8a is turned on in the second solenoid circuit, the normally open contact CR6b of the relay CR6 of the low speed holding circuit is turned on and the relay of the medium speed holding circuit is relayed. It is said that power is supplied when the normally closed contact CR7a of CR7 is turned on.

The electric motor 1 is connected to the power supply when the normally open contact CR9b of the relay CR9 of the motor power supply switching circuit is on, and is rotated by the excitation of the coil MC.

The operation of the operation control circuit shown in FIG. 4 is as follows.

When the relay SWL of the manual low speed operation circuit is excited by the switch SWL, the normally open contact CRLb is turned on, and the relay CR6 of the low speed holding circuit is excited and the normally open contact CR6b is turned on. Also, the command confirmation first and second circuits are not energized and the relays CR3 and CR4 are demagnetized. Therefore, the relay contacts CR3b and CR4b are off and the relay CR5 of the motor power off command circuit is disconnected. Magnetized and its normally closed contact CR5
a is on. Therefore, the relay CR9 of the motor power supply switching circuit is excited by turning on the contacts CR6b and CR5a, and the electric motor 1 is rotated by turning on the contact CR9b. Further, since the relays CR7 and CR8 of the medium speed and high speed holding circuits are not energized, the contacts CR7a and CR8a are both turned on, and the contact CR6b is turned on as described above. Two solenoid circuits are energized and both solenoids SL ₁ ,
SL ₂ are both excited, third both solenoid valves of Figure 14I, 14II position I, I
I and both hydraulic clutches 13 and 23 are inactive.

Therefore, the transmission 3 is operated at a low speed, and the fan 2 is driven at a low speed.

Turn on the switch SWM to perform manual middle speed operation,
When the relay CRL is demagnetized and the relay CRM is excited, the contact CRLb is turned off in the low speed holding circuit, but the self-holding action of the contact CR6b keeps the relay CR6 in the excited state. Therefore, the relay CR3 is excited by turning on the contacts CR6b and CR2b in the command confirmation first circuit. When the relay contact CR3b is turned on, the relay CR5 of the motor power-off command circuit is excited and the first timer TR1 of the motor power-off confirmation circuit is started. Moreover, since the relay contact CR6b maintains the ON state as described above,
The energized state of the solenoid circuit is maintained and the solenoid valves 14I, 14II
Is still in position I, II.

When the first timer TR1 times up, the relay CR7 is excited because the timer contact TR1b is turned on in addition to the relay contact CR3b that was already turned on in the medium speed holding circuit.
As a result, the relay contact CR7a is turned off and the relay CR6 is demagnetized in the low speed holding circuit. Therefore, the second timer TR2 is activated by turning on the relay contact CR7b and the timer contact TR1b in the motor power cycle command circuit, and
Second by turning off the relay contact 7a in the solenoid circuit
The solenoid SL2 is de-energized and the solenoid valve 14II shown in FIG. 3 is moved to the medium speed position M.

When the second timer TR2 times up, the timer contact TR2a in the motor power off command circuit turns off and the relay
Since CR5 is demagnetized, in addition to the relay contact CR7b that was already turned on in the motor power supply switching circuit, the relay contact CR
Relay CR9 is excited by turning on 5a. The motor 1 is restarted by turning on the relay contact CR9b by this, but the hydraulic clutch 23 shown in FIG. 3 completes the engagement within about 10 seconds set by the second timer TR2. are doing.

Thus, the transmission 3 is placed in a state in which the medium-speed gear shift operation is performed, and the fan 2 is driven at a medium speed.

Next, when the switch SWH is turned on and the relay CRH is excited to shift up from the manual middle speed operation to perform the manual high speed operation, the relay contact CRMb is turned off in the middle speed holding circuit, but the relay is held by the self-holding action of the contact CR7b. CR7 remains excited. Therefore, in the command confirmation second circuit, the contact CR7b is kept on and the contact CRHb is turned on by the excitation of the relay CRH, so that the relay CR4 is excited. When the relay contact CR4b is turned on, the relay CR5 of the motor power-off command circuit is excited and the first timer TR1 of the motor power-off confirmation circuit is started. Moreover, since the relay contact CR7b maintains the ON state as described above, the energized state to the first solenoid circuit continues,
The solenoid valve 14I is still in position I.

When the first timer TR1 times up, the relay CR8 is excited because the timer contact TR1b turns on in addition to the relay contact CR5b already turned on in the high-speed holding circuit.
As a result, the relay contact CR8a is turned off and the relay CR7 is demagnetized in the medium speed holding circuit. Therefore, the second timer TR2 is started by turning on the relay contact CR8b and turning on the timer contact TR1b in the power cycle command circuit, and at the same time the first timer TR2 is activated.
When the relay contact CR8a is turned off in the solenoid circuit, the power supply to the first solenoid SL2 is also cut off and the solenoid valve 14I shown in FIG. 3 is moved to the high speed position H.

When the second timer TR2 times up, the timer contact TR2a in the motor power off command circuit turns off and the relay
Since CR5 is demagnetized, in addition to the relay contact CR8b that was already turned on in the motor power supply switching circuit, the relay contact CR
Relay CR9 is excited by turning on 5a. Therefore, the electric motor 1 is restarted, but by the time the second timer TR2 times up, the high speed hydraulic clutch 13 shown in FIG. 3 has completed engagement.

Thus, the transmission 3 is placed in a state in which the high-speed gear shift operation is performed, and the fan 2 is driven at high speed.

Even if the switch SWH is turned on from the manual low speed operation state and the switch SWH is turned on to the manual high speed operation state all at once, the motor is operated for a short time set by the second timer TR2 without any explanation. The power of 1 will be turned off.

When shifting from high speed to manual speed in manual operation, the relay contact CR3a has already been turned on in the middle speed holding circuit because the relay CR3 of the command confirmation first circuit is demagnetized. Since the contact CRMb is turned on, the relay CR
7 is immediately excited, and therefore, in the motor power supply switching circuit, the relay contact CR7b is immediately turned on instead of the relay contact CR8b, so that the excited state of the relay CR9 continues and the rotation of the electric motor 1 continues. Also since turning on the relay contact CR7b is thereby turned on relay contacts CR8a is in the first solenoid circuit this time, the solenoid valve 14I shown in FIG. 3 solenoid SL ₁ is energized is transferred to the position I.

It is almost the same when shifting from medium speed or high speed to low speed in the manual operation. Immediately exciting the relay CR6 of the low speed holding circuit, the relay CR9 of the motor power supply switching circuit connects the excited state to the motor 1. Is not interrupted, and the solenoid SL2 is excited in the second solenoid circuit, so that the solenoid valve 14I
I is moved to position II.

When the switch SWA is turned on in the operation control circuit shown in FIG. 4 to perform automatic operation, switching from low speed operation to medium speed operation is commanded by excitation of relay CR1 by turning on the sensor SEM, and from medium speed operation to high speed operation. Switching to operation is commanded by exciting relay CR2 when sensor SEH is turned on.

And the normally open contacts CR1b, CR2b of these relays CR1, CR2
Is inserted in the command confirmation first or second circuit so that the relays CRM and CRH act in the same manner as the normally open contacts CRMb and CRHb. The first and second circuits operate in the same manner as described for the shift up command during the manual operation.

While the relay contact CRLb was turned on during manual low-speed operation to keep the excitation state of the relay CR6, during automatic operation, the relay contact CRAb and both sensors SEM, SEH kept on during that operation were turned off. The relay contact CR1a and CR2a that turn on hold the excitation state of the relay CR6, and the middle speed holding circuit automatically operates so that it operates in the same way as the relay contact CRMb that turns on during manual middle speed operation. In addition to the relay contact CR1b for medium speed command, the relay contact CR2b for high speed command during automatic operation is provided so that it operates in the same way as the relay contact CRHb that turns on during manual high speed operation in the high speed holding circuit. Therefore, the low-speed, medium-speed and high-speed holding circuits or their relays CR6, CR7, CR8 also operate in the same manner as in the automatic operation and the manual operation.

Therefore, the operation control circuit shown in FIG. 4 operates in the same manner as in the manual operation even during the automatic operation. A power-on display circuit similar to that shown in FIG. 2 is also provided, and similarly, a display circuit for displaying low-speed, medium-speed, and high-speed operating states can also be provided. In the operation control circuit shown in FIG. 4, the motor power off command circuit, the motor power off confirmation circuit, the motor power open / close circuit, and the motor power recycle command circuit turn off the electric power of the motor 1 for a short time at the time of the shift up command. It is the circuit part of.

EFFECTS OF THE INVENTION As described above in the section of operation, the present invention is applied to the transmission 3
When shifting up, the electric power of the electric motor 1 is temporarily cut off for a short time, and the electric motor 1 having a small amount of inertia is reversely driven by the rotating load 2 which rotates by inertia.
In No. 3, since the work amount of the friction clutch is reduced by not sharing the work amount corresponding to the acceleration torque, it is not necessary to add an extra capacity to the friction clutch for shifting up.

Therefore, according to the present invention, a small capacity friction clutch can be used to reduce the apparatus cost by itself, and the hydraulic pressure of a hydraulic pump or the like to be provided in association with the transmission 3 including the hydraulically operated friction clutch. Since the equipment can be inexpensive, the device cost can be further reduced.

If the electric motor is turned off even during downshifting, the motor starts and stops so frequently that power consumption increases due to power loss when the electric motor restarts, and the life of the electric motor decreases. Since the driving speed is temporarily stopped, the rotational speed of the fan etc. may be greatly reduced once compared to the desired rotational speed to be obtained by shifting down, so it takes time until the desired rotational speed is obtained. In the case of an air-conditioning fan, the temperature sensor temporarily senses a high temperature due to a drastic reduction in the air flow, and a shift-up signal is output subsequently to the shift-down signal, which may cause confusion in temperature control. However, according to the present invention, the electric power of the electric motor is not turned off at the time of downshifting without excessive force being applied to the friction clutch, and the electric power is turned off only at the time of shift up. It has never Jill.

[Brief description of drawings]

FIG. 1 is a mechanism diagram and hydraulic circuit diagram showing the first embodiment, FIG. 2 is a circuit diagram of an electric control circuit in the first embodiment, and FIG. 3 is a mechanism diagram and hydraulic pressure showing the second embodiment. Circuit diagram, 4th
The drawing is a circuit diagram of an electric control circuit in the second embodiment. 1 ... Electric motor, 2 ... Blower fan, 3 ... Transmission, 4 ...
… Input shaft, 5 …… Output shaft, 8,9 …… Gear, 10,11 …… Gear, 12 …… One-way clutch, 13 …… Hydraulic clutch (hydraulic actuated friction clutch), 14,14I, 14II… … Solenoid valves, 14a, 1
4I a, 14II a …… Spring, 19 …… Controller, 21,
22 …… Gear, 23 …… Hydraulic clutch (hydraulic actuated friction clutch), SL, SL1, SL2 …… Solenoid, CR1, CR2, CR3, CR4,
CR5, CR6, CR7, CR8, CR9 …… Relay, TR1, TR2 …… Timer, SE, SEM, SEH …… Sensor, SW1, SW2, SWL, SWM, SWH, SW
A: switch, MC: coil of electric motor 1.

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H02P 15/00 C (72) Inventor Toshio Matsuoka 341 Inadera, Amagasaki City, Hyogo Pref. (56) References Japanese Unexamined Patent Publication No. Sho 49-31024 (JP, A) Actual exploitation Sho 55-104145 (JP, U)

Claims (1)

[Claims] Claim: What is claimed is: 1. Between a rotary load (2) having a large inertial amount such as a fan and an electric motor (1) for rotationally driving the rotary load, a hydraulic operation is performed to shift gears other than at least the lowest gear. In a rotation speed control device provided with a stepped transmission (3) configured to be obtained by engaging an operation type friction clutch (13, 23), the friction clutch is controlled by hydraulic pressure supply / discharge control. Solenoid valve (14,23) that controls the operation of (13,23)
14I, 14II) has an electric motor start / stop control circuit section for turning off the electric power of the electric motor (1) for a short time only when a shift-up command signal for instructing the shift-up of the transmission (3) is input. A rotation speed control device for a fan or the like, characterized in that