JPH05260643A - Overload detection control system for motor - Google Patents

Abstract

PURPOSE:To perform drying operation or rice-hulling operation even if a power supply frequency of an original power supply of a motor used for a grain particle drying machine or a rice-hulling machine cannot be detected. CONSTITUTION:When a power supply frequency of an original power supply of a motor 4 cannot be determined to be either 50Hz or 60Hz by a power supply transformer 34 for the motor 4 which rotates and drives a wind-delivery machine of a grain particle drying machine, a reference rated current value of the motor 4 is set to 50Hz reference rated current value at a higher side of setting value of the reference rated current value of the motor 4 for drying the grain particle. Then, when the power supply frequency cannot be set, operation continues by setting to 50Hz where the reference rated current value is at a higher side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor overload detection control system.

[0002]

2. Description of the Related Art Conventionally, for example, a motor for rotationally driving an air exhauster for sucking and exhausting hot air from a grain dryer for drying grains or a chaff for a huller for hulling grains is sucked and discharged. The motor, etc., that drives the wind blower to rotate is 50Hz at the power frequency.
, And the standard rated current values set by 60HZ are different, 50HZ and 60HZ of the power supply frequency of these motors are detected by the power supply transformer. If this power supply frequency is not detected, these motors are stopped and controlled, and the current value is changed by the current transformer. When the detected standard current value is detected and compared with the standard rated current value set for each of 50 HZ and 60 HZ of the power supply frequency and the detected current value is equal to or more than the set standard rated current value for a predetermined time or more, these values are detected. The motor was an overload detection method in which it was detected that the motor was overloaded and stop control was performed.

[0003]

DISCLOSURE OF THE INVENTION For example, a motor for an exhaust fan that rotationally drives an exhaust fan that sucks and exhausts hot air of a grain dryer that dries grains, or a huller that hulls grains A description will be given of a fan-use motor for use in the dryer, which is included in a fan-use motor for rotationally driving a fan that sucks and exhausts rice husks.

The grains stored in the grain storage chamber of the dryer are driven to rotate by the rotation of the motor for the blower while being drawn out from the storage chamber and flowing down. The hot air is sucked and discharged by the exhaust fan and passes through the drying chamber, whereby the grains flowing down in the drying chamber are exposed to the hot air and dried. At the time of this drying operation, the power frequency of the original power source of the motor for the exhaust fan is set to 5
0HZ and 60HZ are detected by the power transformer, and if this power frequency is not detected, the motor for the exhaust fan is stop-controlled, the dryer is stopped, and the drying of the grain is stopped. The current value is detected by a current transformer, and this detected current value is compared with the reference rated current value set for each of these 50HZ and 60HZ. In some cases, a value greater than or equal to the value may be detected for a predetermined time or longer.
The motor for the exhaust fan is determined to be overloaded, and the motor for the exhaust fan is stop-controlled by the determination result,
The dryer is stopped to stop the grain drying.

At the time of this drying operation, it is intended to continue the drying operation even when the power supply frequency is not detected.

[0006]

According to the present invention, the power supply frequency of the original power supply of the motor 4 is detected by the power supply transformer 34, and then 50.
In addition to detecting HZ and 60HZ, the current value of the motor 4 that is rotationally driven is detected by the current transformer 38 and compared with the reference rated current value set for each of 50HZ and 60HZ to detect overload. When the power supply transformer 34 cannot detect the power supply frequency, the reference rated current value to be set is set to the reference rated current value of 50 HZ for operation, and the overload detection control system is configured.

[0007]

EFFECTS OF THE INVENTION The motor 4 for the air blower that rotates and drives the air blower that sucks and exhausts the hot air of the grain dryer that dries the grain, or the hull of the huller that hulls the grain is sucked and discharged. A description will be given of the motor 4 for the exhaust fan used in the dryer among the motors for the exhaust fan that rotationally drive the exhaust fan.

The grain accommodated in the grain storage chamber of the dryer is driven to rotate by the rotation of the motor 4 for the blower while being fed out from the storage chamber and flowing down. The hot air is sucked and exhausted by the air blower and passes through the drying chamber, so that the grains flowing down in the drying chamber are exposed to the hot air and dried. At the time of this drying operation, 50 HZ or 60 HZ of the radio frequency of the original power source of the motor 4 for the exhaust fan is detected by the power transformer 34, and the current value is detected by the current transformer 38.

The standard rated current value set for each power source frequency of 50 HZ and 60 HZ is compared with the detected current value detected for each power source frequency, and when straw dust or the like is wrapped around the exhaust fan, the detected current value is detected. May exceed a reference rated current value for a predetermined time or longer, and in such a state, it is detected that the motor 4 for the exhaust fan is overloaded. The motor 4 is stopped and controlled, the dryer is stopped, and the drying of the grain is stopped.

In addition, during the drying operation, the power frequency of the original power source is 50 Hz or 60 Hz in the power transformer 34.
When Z is not detected, the reference rated current value at 50 HZ is set, and when the current transformer 38 detects a current value equal to or higher than the set reference rated current value of 50 HZ, the same as above. The exhaust fan motor 4 is detected to be overloaded, the exhaust fan motor 4 is automatically stopped, and the dryer is automatically stopped to stop the drying of the grain.

The same operation as described above is performed when hulling work is performed by the hulling machine.

[0012]

When the determination of 50HZ and 60HZ cannot be made due to the abnormality of the power supply frequency, the reference rated current value on the 50HZ side (high current value as the set value) is set, and the operation is continued as it is. It will be possible. Again 60Hz
If it is set on the side, overload detection will be frequently performed in the 50HZ area, but since it is set on the 50HZ side, such an occurrence can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The illustrated example is a circulation type grain dryer 1 for drying grains.
The figure shows a state in which a moisture sensor 2 for detecting grain moisture, a burner 3 for generating hot air, and motors 4 and 4 for rotating and driving each part are mounted, and an air exhauster 5 therein is rotationally driven. The motor 4 for the exhaust fan will be described.

The dryer 1 has a rectangular shape that is long in the front-rear direction and has a transfer gutter 7 and a ceiling plate 8 in which a transfer spiral is rotatably installed in the upper part of the machine wall 6. Below the ceiling plate 8, grains are provided. A grain storage chamber 9 for storing grains is formed. Grain drying room 1
0 and 10 are provided between the exhaust chambers 11 and 11 on both the left and right sides and the blower chamber 12 at the center on the lower side of the storage chamber 9, and the grains are fed down to the lower portions of the drying chambers 10 and 10. Each of the feeding valves 13 is rotatably supported.

The grain collecting trough 14 rotatably supports a transfer spiral, and is provided below the drying chambers 10 and 10 to communicate with each other. The burner 3 is provided inside the burner case 15, and the burner case 15 is detachably provided on the outer surface of the machine wall 6 so as to correspond to the inlet side of the blower chamber 12 on the front side of the machine wall 6. Further, an operating device 16 for starting and stopping the burner 3, the moisture sensor 2 and the dryer 1 for each operation of loading, drying and discharging is detachably provided on the machine wall 5 on the front side.

The exhaust fan 5 is a machine wall 6 on the rear side,
The exhaust passage chamber 17 provided so as to communicate with the left and right exhaust chambers 11, 11 is provided in the central rear side exhaust duct 18, and the exhaust wall 5 on the rear side of the exhaust duct 5 drives the exhaust fan 5 to rotate. The motor 4 for the wind blower is provided. The valve motor 4 rotationally drives the delivery valves 13 and 13 via a speed reduction mechanism.

The fuel pump 19 has a fuel valve,
The fuel pump 19 is provided outside the lower plate of the burner case 15, and the fuel in the fuel tank 20 is sucked by the fuel pump 19 and supplied to the burner 3. The blower 21 is provided on the outer side of the upper plate, and is driven for speed change and rotationally driven by the blower motor 4 so that combustion air corresponding to the supplied fuel amount is blown to the burner 3 by the blower 21.

The diffusion plate 22 is provided at the central portion of the bottom plate of the transfer gutter 7 in the front-rear direction and below the supply port for supplying the transfer grains to the storage chamber 9, and the grains are evenly diffused into the storage chamber 9. I'm giving back. The grain-sustaining machine 23 is provided outside the front side of the machine wall 6 and has a belt with a bucket conveyor 24 stretched inside. The upper end of the grain-raising machine 23 has a throw-out pipe 25 between the transfer gutter 7 and the starting end. It is provided to communicate with each other, and the lower end is the grain collecting gutter 14
A supply gutter 26 is provided between the end portion and the end portion to communicate with each other.

The motor 4 for the grain elevator comprises a belt with the bucket conveyor 24, the transfer spiral in the transfer gutter 7,
The moving spiral and the like in the diffusion board 22 and the grain collecting trough 14 are rotationally driven. The moisture sensor 2 is provided substantially vertically in the center of the grain raising machine 23.
Is transmitted from the operating device 16, the motor 4 for moisture is rotated, and the moisture sensor 2
Each of the parts is rotationally driven, and receives the grains falling during the upper conveyance by the bucket conveyor 24, and while crushing the grains by pressure, the moisture of the crushed grains is detected.

The operating device 16 has a box shape, and the surface plate of the box body is provided with a motor 4 for the exhaust fan of the dryer 1.
The starter switch 27 for stopping the valve motor 4, the blower motor 4, the grain refiner motor 4 and the moisture motor 4 and the like, and a start switch 27 for starting each of the drying and discharging operations. A stop switch 28, a moisture setting knob 29 for setting the finishing target moisture of the grain according to the operation position,
Grain type setting knob 30 and stake amount setting knob 3 for setting the hot air temperature generated from the burner 3 according to the operation position.
1. A display unit 32 for digitally displaying various display items and a monitor display are provided.

The control device 33 is provided in the operating device 16, and FIG. 1 shows the control of the motor for the exhaust fan.
A motor 4 for the exhaust fan and a power supply transformer 34 for detecting the power supply frequency of the original power supply of each motor 4 are provided, and the power supply frequency of this power supply transformer 34 is passed through a rectifier circuit 35, a comparison circuit 36 and a digital input circuit 36 '. 50Hz and 6
The detection signal of 0HZ is input to the control microcomputer 37. A current transformer 38 for detecting the current value of the motor 4 for the exhaust fan is provided.
8, the current value is input to the control microcomputer 37 through the rectification / smoothing circuit 39, the amplification circuit 40, the analog input circuit 41, and the AD conversion circuit 42. The operations of the switches 27, 28 and the setting knobs 29, 30, 31 are input to the control microcomputer 37 via the digital input circuit 43. The control microcomputer 37 is provided with a memory 44.

The control microcomputer 37 is
An output circuit 45 receives a motor output command from the control computer 37, and the output circuit 45 controls the starter and stop motors 4 and 4 for the exhaust fan. The display output circuit 46 receives commands for various display items, and the display output circuit 46 controls the display of various items on the display unit 32. An output circuit 47 receives a command for output of the combustion system, and the output circuit 47 starts, stops, and controls the fuel valve and the fuel pump 19.

The control of the motors 4 for the blower, the valve, the blower, the grain refiner and the water by the controller 33 is performed as follows. Explaining with respect to the motor 4 for the exhaust fan, that is, each of the start switches 27 is operated, this operation is input to the control microcomputer 37, and when the drying operation is started, the drying operation is started. Start switch 27
Is detected (step 101), NO is returned to (step 101), and if YES is detected, the exhaust fan motor 4 is turned on (step 1).
02), the current value of the motor 4 for the exhaust fan is detected and read by the current transformer 38 (step 1
03), it is detected whether it is less than a certain value (step 10).
4) If YES is detected, it is detected as a disconnection and processed (step 105).

If NO is detected in step 104, it is detected whether the initial time has elapsed (step 106), and Y
If ES is detected, it is detected whether the value is equal to or more than a certain value (step 107), and if YES is detected, it is detected as overload and is processed (step 108). When NO is detected in (Step 107), it is detected whether or not a certain period of time has passed (Step 109), and when YES is detected, the procedure returns to (Step 103). When ON is detected, the procedure returns to (Step 109). .. When NO is detected in (step 106), the process proceeds to (step 109).

The power supply transformer 34 detects the power supply frequency of the original power supply, and the control microcomputer 37
Is input and read (step 201), 50H
If Z is detected (step 202), and if YES is detected, a reference rated current value of 50HZ is set as the overload detection reference (step 203). If NO is detected in (Step 202), it is detected whether there is up to 60HZ (Step 204), and if YES is detected, the reference rated current value of 60HZ is set as the overload detection reference value (Step 205). .. If it is detected to be ON in (step 204), it is detected to be a frequency detection abnormality (step 20).
6) and (step 203), the overload detection reference value is set to the reference rated current value of 50HZ (step 203).

In addition, the control device 33 has the following functions. When the moisture sensor 2 detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob 29, it is determined that the drying of the grain has ended, the dryer 1 is stopped, and the grain Stop drying. The operation of the above embodiment will be described below.

Setting knobs 29, 30, 3 of the operating device 16
1 is operated to a predetermined position and the start switch 27 for starting the drying operation is operated, so that the motors 4, 4, ... Of the grain dryer 1 are started, and each unit of the dryer 1, the burner 3, and the water content. The sensor 2 and the like are started, hot air is generated from the burner 3, and the hot air is blown from the air blowing chamber 12 into the grain drying chambers 10 and 1
After passing through 0, the exhaust air is sucked and exhausted by the exhaust fan 5 through the exhaust air chambers 11 and 11 and the exhaust air passage chamber 17.

The grains stored in the grain storage chamber 9 are exposed to the hot air while they are flowing down from the storage chamber 9 into the drying chambers 10 and 10 to be dried. It is fed to the lower part and flows down, and is fed from the grain collecting gutter 14 through the supply gutter 26 and into the grain raising machine 23 by the lower transfer spiral, and is conveyed to the upper part by the bucket conveyor 24 and transferred through the throwing pipe 25. It is supplied into the gutter 7 and transferred from the transfer gutter 7 onto the diffusion plate 22 by an upper transfer spiral, and is uniformly diffused and reduced into the storage chamber 9 in the diffusion plate 22 and circulated and dried.

When the grain moisture detected by the moisture sensor 2 is the same as the finishing target moisture set by operating the moisture setting knob 29, it is detected that the drying is completed, The controller 1 automatically controls the dryer 1 to automatically stop and the drying of the grain is stopped. At the time of this drying work, the power frequency of the original power source is 5 by the power transformer 34.
It is detected whether it is 0HZ or 60HZ, and the current value is detected by the current transformer 38.
The standard rated current value set for each of HZ and 60HZ is compared with the current value detected for each power supply frequency. If straw dust or the like is wrapped around the exhaust fan 4, the exhaust fan that rotates the exhaust fan 5 is rotated. The detected current value of the motor 4 for the wind blower may be detected for a predetermined time or longer when it is equal to or higher than the reference rated current value. In such a state, the motor 4 for the blower wind is detected to be overloaded. As a result, the motor 4 for the exhaust fan is automatically stopped, the dryer 1 is stopped, and the drying of the grain is stopped.

During this drying operation, the power source of the main power source of the power transformer 34 is 50 Hz or 60 Hz.
If it is not detected, the reference rated current value at 50HZ is set, and when the current transformer 38 detects a current value equal to or higher than the set reference rated current value of 50HZ, as described above, Motor 4 for the blower
Is detected as being overloaded, the motor 4
Is automatically stopped and the dryer 1 is automatically stopped to stop the drying of the grain.

[Brief description of drawings]

 The figure shows an embodiment of the invention.

FIG. 1 is a block diagram.

FIG. 2 is a flowchart.

FIG. 3 is a flowchart.

FIG. 4 is an overall side view in which a grain dryer is partially broken.

5 is an enlarged sectional view taken along line AA of FIG.

FIG. 6 is an enlarged front view in which a part of the grain dryer is partially broken.

[Explanation of symbols]

 4 Motor 34 Power transformer 38 Current transformer

Claims (1)

[Claims] 1. A power source frequency of an original power source of the motor 4 is detected by a power transformer 34 to detect 50HZ and 60HZ, and a current value of the motor 4 which is rotationally driven is detected by a current transformer 38 to detect 50HZ, In the case where overload detection is performed by comparing with the reference rated current value set for each 60 HZ, when the power supply frequency cannot be detected by the power supply transformer 34, the set reference rated current value is set to the 50 HZ.
The overload detection control method is characterized by setting and operating the standard rated current value of.