JP2000333892A - Motor-driven controller for floor polishing cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To soft-start a pad so that the pad acts on a floor surface with a low torque at the time of operation start, to keep a motor torque and a motor current in a flat stable state in a following real use rotation area, namely, in a high speed area, and to control the input current of a motor and an inverter into low value at the time of motor start and motor lock. SOLUTION: A PAD PT is rotated by using a three-phase induced motor 10 of 90 V while using an inverter 23 of single-phase AC input 100 V and three- phase AC output 90 V and when the skid of the motor 10 exceeds a prescribed value, driving of the motor 10 is controlled by outputting a frequency obtained by adding a prescribed skid value to a frequency corresponding to the revolving speed of the motor, as an inverter output frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a floor polishing machine (polisher or sweeper) for polishing and cleaning a floor by rotating a pad at a high speed with a motor. Specifically, by driving a motor through a variable frequency inverter device, the contact pressure of the pad against the floor surface is controlled stably, and an overcurrent occurs in the primary side power supply at the time of starting and operating the motor. The present invention relates to a motor drive control device for a floor polisher that has been devised so as not to be devised.

[0002]

2. Description of the Related Art As a prior art relating to a motor drive control device for a floor polishing cleaner, for example, Japanese Patent Laid-Open No. 7-23660 is known.
Japanese Patent Application Laid-Open No. 6-23759 discloses a "floor polishing apparatus provided with a pad pressing force adjusting function" described in Japanese Patent Application Laid-Open No. 4-53287, an "electric floor cleaning machine" described in Japanese Patent Publication No. 5-51287.
There is a "drive device for an induction motor for a polisher" described in Japanese Unexamined Patent Application Publication No. 3 (Kokai) No. 3 (Kokai) Publication.

[0003] The floor polisher disclosed in the first publication detects the motor current value and increases the motor current value when the pressing force of the pad on the floor surface is reduced, thereby increasing the pad rotation. If the pad pressure increases on the floor while the pad pressure increases on the floor, the current value will decrease and the motor speed will decrease to reduce the pad rotation. There is described a motor drive device for a floor polisher cleaning device that adjusts so that the pressing force of the pad against the floor surface is always constant by reducing the suction force on the floor surface.

Further, the above-mentioned second publication describes that a three-phase 200V general-purpose motor is driven by using a single-phase 100V, three-phase 200V output type electric inverter as an input power supply for an electric floor washer. Have been.

Further, in the third publication, a polisher using an AC motor uses a variable frequency inverter so that the torque is always kept at a maximum at the time of operation including starting operation. In addition, a driving device designed to control the frequency and the voltage so that an overcurrent does not flow to the motor is described.

[0006]

However, in the motor driving device described in the first publication, a DC motor is used as a driving source. There is a problem that there is a limitation in use time, and the mechanical device must be large in size, which is not preferable as a motor drive device for a floor surface polishing cleaning device. Motor rotation control to keep the pressing force of the pad on the floor constant is easy (the number of rotations increases proportionally as the current is increased). There are drawbacks such as short and expensive. At the start, the rotation is zero, so there is no suction force between the pad and the floor, so the starting torque of the motor should be small, but the starting torque of the DC motor is large due to its characteristics Therefore, a large torque is generated in the pad depending on the contact state with the floor surface at the time of the start operation, and a shock is applied. There were various problems.

The electric floor washer disclosed in the second publication can easily use a commercial power supply, and
Although it has the advantage of using a general-purpose motor,
From the relationship between the rotational speed and the torque characteristics, the torque decreases significantly as the set rotational speed decreases, and when compensating for the decrease in torque, the current value is high even with no load, and a large current flows when the motor is locked. However, there is a problem that an overcurrent flows to the power supply.

Further, the driving device described in the third publication has a slip frequency capable of outputting the largest torque with respect to the motor current, and a V / f value at which the gap flux of the motor is always constant. It has a function to calculate and output the frequency and voltage by using, and to instruct these inverters to output the calculated output to the inverter, irrespective of the set value of the number of rotations of the motor, to be able to operate with the highest torque for the current of the motor. As a result, the motor is driven within a constant current at any rotational speed, and has a feature that does not cause an overcurrent to flow through the power line. On the other hand, as described in the first publication, the motor has a maximum Torque is generated, which is dangerous to the operator due to vibration and impact force during operation, and the starting current increases. Flow there is a problem that flows.

Therefore, a technical problem of the present invention is to soft start the pad so that the pad acts on the floor surface with a low torque at the start of the operation, and thereafter, to the actual use rotation area, that is,
In the high-speed range, the motor torque and motor current are maintained in a flat and stable state, and when the motor is started and the motor is locked, the input current of the motor and inverter can be controlled to be low. An object of the present invention is to provide a devised motor drive control device for a floor polishing cleaner.

[0010]

Means taken by the present invention to solve the above-mentioned technical problems are as follows.

[0011] By driving a three-phase induction motor through a single-phase AC 100V input, three-phase AC output sine wave digital type vector control type inverter to rotate the pad and polish or clean the floor, The actual rotational speed of the motor is obtained using a rotation detector, and the slip frequency of the motor is obtained from a predetermined set frequency. Based on the actual rotational speed of the motor and the slip frequency of the motor, a new inverter output frequency is obtained. By calculating and outputting, the floor polishing cleaner configured to drive the motor,

(1) When the slip of the motor is within a predetermined set value, the motor is driven at a predetermined frequency,
When the slip of the motor exceeds a predetermined value, a frequency obtained by adding a predetermined slip value to a frequency corresponding to the motor speed is newly output as an inverter output frequency, and the motor is driven and controlled. (Claim 1)

(2) The set frequency of the motor is set to at least a plurality of stages of high speed, medium speed and low speed, and when the actual number of rotations of the motor is out of a predetermined range of the predetermined frequency, a predetermined set frequency is set. The motor is driven and controlled by correcting the output to the inverter output frequency one step lower or higher. (Claim 2)

(3) The output of the inverter is three-phase AC 90
V, while the rated voltage of the three-phase induction motor is 90V. (Claim 3)

(4) The operation frequency of the motor at the time of starting operation is increased proportionally from the start until the predetermined frequency is reached, and at the same time, the slip is controlled to be constant. (Claim 4)

(5) The operation of the motor is stopped when the number of rotations of the motor falls below a preset value. (Claim 5)

(6) The pad rotated by the motor is provided with an upward supporting force separated from the floor, and
Many fine spaces are provided inside this pad. (Claim 6)

According to the first aspect of the present invention, when the rotation decrease (slip) of the motor with respect to the set speed is within a predetermined value, the motor is driven according to the set frequency, and the slip is set to a predetermined value. Is exceeded, the slip is controlled to be constant, so that the current value is kept within a substantially constant range and the pad can be driven and rotated economically in a stable state.

According to the means according to claim 2 described in the above (2), the number of revolutions of the pad can be set at a plurality of stages of high speed, medium speed, and low speed, and the number of revolutions of the motor is more than a predetermined value. When the speed decreases or rises, the setting can be shifted to a speed one step lower or higher than the speed specified in advance, that is, one of high speed, medium speed, and low speed. The current value can be maintained constant without changing the current value in the increasing direction. In particular, in a high-speed setting, if shift control is not performed, the current slightly increases (about 2 A) when the rotation speed decreases. Therefore, although the constant slip control described in (1) above is not sufficient, it is possible to obtain more effective results by performing the above shift control together. In addition, from the above-mentioned point, in the rotation speed capable of exhibiting the maximum performance of the motor, that is, in the high-speed rotation region, the pad can be rotated at high speed without fear of overcurrent to the power supply,
As a result, it is possible to maximize the polishing or cleaning effect.

According to the means according to claim 3 described in the above (3), while a single-phase 100V is inverter-converted to a 90V three-phase, a three-phase 90V induction motor is used as a driving source, so that the voltage doubler unit is used. It is unnecessary, and when converting from single-phase to three-phase, the voltage drops by about 10 V.
Using a three-phase induction motor rated at 90V, it is possible to drive the pad to rotate stably without reducing the efficiency of the motor.

According to the means according to claim 4 described in the above (4), at the start of operation, the rotation of the pad starts from zero, and the suction force between the pad and the floor surface starts from zero. Will do. In other words, at the start, the torque of the motor is small, and therefore, a low torque and a low current value (between 40 and 60 A in the past, 5 in the present invention).
A) is sufficient to input the frequency that generates
As a result, no overcurrent flows to the power supply side, or the contact pressure between the pad and the floor suddenly acts on the motor, generating vibrations and shocks. The frequency is gradually increased to the target frequency for a certain period of time, and after a certain period of time, it becomes an operation pattern at a normal set speed, and a moderately high contact pressure is generated between the floor surface and the pad. Polishing effect or
It is possible to exhibit a cleaning effect.

According to the means of claim 5 described in the above (5), for any reason, when the rotation speed of the motor decreases, the current value decreases.
In consideration of the floor surface and the like, it is possible to stop the motor and take various measures when the pad is biting on the floor surface or other objects, or in order to eliminate any other problems.

According to the means of claim 6 described in the above (6), since the pad has a small air hole, when the pad rotates, a suction force is generated between the pad and the floor surface, and the floor naturally occurs. The pad will be pressed against the surface. Also,
According to the method of the above (6), when the pad is new, the pad is thick, so that the contact with the floor surface is on the entire surface of the pad, so that the contact resistance is large, and the roughness of the pad is also eliminated by crushing the eyes. Since the frictional resistance with the floor also increases, the load is applied to the motor, slip control is performed, and the current value is suppressed. On the other hand, when the pad is worn out, the pad thickness becomes thin, and the contact state with the floor surface is lost over the entire surface, resulting in one-sided contact. Therefore, the contact resistance decreases, the motor load decreases, and the current value also decreases. Therefore,
The actual number of rotations of the pad is increased by the decrease in the current value (that is, it is possible to rotate in a region close to the high-speed set number of rotations), and the pad suction force is increased to increase the pad pressure again. Therefore, a high polishing effect or cleaning effect can be obtained again.

As described above, the above (1) to (1)
By solving the above technical problem by means of (6),
The problem of the conventional technique can be solved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor drive control device for a floor polishing cleaner according to the present invention will be described below with reference to the drawings. FIG. 1 shows a floor on which a motor drive control device according to the present invention is implemented. FIG. 2 is a side view illustrating the appearance of the surface polishing cleaner, FIG.
FIG. 1 is a plan view of the motor, in which reference numeral 1 denotes a polishing machine, and PT denotes a motor 1 housed in the body 1A.
Pad that rotates at high speed by 0 to polish the floor, 2
Is a pad cover, 1B is an upper cover of the body 1A, 3 is a traveling wheel, 3K is an auxiliary wheel, 4 is an operation handle mounted on a rear portion of the body 1A, and 5 is an operation box mounted on an upper end of the operation handle 4. , 6, and 6 indicate left and right operation grips.

Reference numerals 5A and 5T denote operating lever switches and push button switches provided on the operation box 5, and reference numeral 7 denotes a bifurcated left and right lower end portion 7X about the axle 3R of the traveling wheel 3. The handle leg 7 is freely attached. The lower end 4A of the operation handle 4 is connected to the upper end of the handle leg 7, and the operation handle 4 is indicated by a solid line in FIG. The neutral position and the operating position inclined forward as shown by the imaginary line, respectively, and when the operating position is tilted and rotated, the switch 10 activates the motor 10 to activate the pad PT. When the pad 10 rotates and returns to the neutral position, the drive of the motor 10 is stopped, and the rotation of the pad PT is stopped.

FIG. 3 is a side sectional view for explaining the structure inside the body 1A when the operation handle 4 is tilted and turned to the operating position, wherein 1Z is a body frame of the body 1A, and 12 is a foot pedal. , 11 is a pad mount, 11R is an interlocking pulley attached to the rotating shaft 11T of the pad PT, 10R is a drive pulley attached to the output shaft of the motor 10,
V is a belt stretched between the pulleys 10R and 11R, and the pad PT is configured to rotate at high speed by the motor 10.

Further, in FIG. 3, 2T, 2T has upper ends slidably mounted vertically on the machine frame 1Z side, and lower ends 2A, 2A provided on the upper surface of the pad cover 2. By attaching the pad cover 2 and the pad PT, the slide mounting rods 2S and 2S which hang the whole of the pad PT so as to be able to move up and down with respect to the machine board frame 1Z have both ends between the machine board frame 1Z and the attaching portions 2A and 2A. 2 shows a traction spring that always pulls up the entire pad cover 2 and the pad PT by mounting the pad cover 2 and the pad PT.

Further, in the present invention, as the above-mentioned pad PT, for example, a tough chemical fiber such as a polyester fiber is entangled with each other and compression-molded, or a chemical material is formed into a sponge shape. Since a special structure having a large number of minute spaces inside is used, the pad PT is
When the rotation at a high speed of about 0 rpm, the air in each space is discharged to the outside, and the inside of the pad PT is in a negative pressure state, exerting an adsorbing force on the floor surface and pulling the entire pad PT and the pad cover 2. 3 against the pulling force of the springs 2S, 2S, the pad PT can be rotated at a high speed in a state where the pad PT is in close contact with the floor, and the motor 10 is turned off to rotate the pad PT. Is stopped, the pad PT and the pad cover 2 are pulled up with a space between the pad PT and the floor surface by the pulling force of the springs 2S, 2S.

Further, in the above-mentioned drawings, 21 is a rectifier, 22 is a smoothing unit, and 23 is a sine wave digital type vector control inverter (single-phase AC 100V / three-phase AC 90V output type) provided in the operation box 5 described above. In the present invention, a three-phase induction motor having a rated voltage of 90 V is used as the motor 10 driven via the inverter 23.

Reference numeral 24 denotes a power supply unit, 25 denotes a control unit also provided in the operation box 5, 26 denotes a speed command select switch, 27 denotes an encoder provided in the motor 10, and FIG. FIG. 2 is a block diagram illustrating a typical configuration.

In the above configuration, the encoder 27 detects the actual number of rotations of the motor 10 driven to rotate via the inverter 23, while the control unit 25
The slip frequency of the motor 10 is obtained from a predetermined set frequency.
The new inverter output frequency is calculated and output from the slip frequency, and the inverter 23 drives and rotates the motor 10 with the new inverter output,
In addition, when the rotation decrease (slip) of the motor 10 with respect to the set speed is within a predetermined value, the motor 10 is driven in accordance with the set frequency. Is kept within a certain range. Note that the slip width was set to the most efficient value in the frequency range of 50 to 60 Hz, which is a normal use area.

The speed of the motor 10 is set at least at a high speed (for example, 2100 rpm) and a medium speed (for example, 180) by the speed command select switch 26.
0 rpm) and a low speed (1500 rpm).
When the actual rotation speed of the inverter 23 greatly changes from a predetermined value due to slip control due to the relationship between the floor surface and the pad PT, the output frequency of the inverter 23 is increased by one step with respect to a predetermined set frequency in order to suppress current fluctuation. The setting is shifted downward or upward to shift the setting of the rotation speed of the motor 10 to one of high speed, medium speed, and low speed, and further, the rotation speed of the motor 10 is extremely reduced. In this case, the motor 10 is stopped to stop the operation.

Further, according to the present invention, as described above, a single-phase AC 100 V input / three-phase AC 90 V output inverter 2
, 90V, 1.2KW three-phase induction motor 1
By driving and rotating 0, various advantages such as reduction of the starting current (40 to 60 A in the past, about 5 A in the present invention), variable speed, smoothing of current fluctuation, and high efficiency can be exhibited. By setting the phase to 90 V output, a voltage doubler unit is not required, and cost reduction and size reduction can be realized.

In addition, after the start of the operation, the operating frequency of the motor 10 is gradually increased to the target frequency for a certain period of time, and after a certain period of time, an operation pattern at a normal set speed is formed, and a moderately high contact pressure is obtained. Therefore, since it is generated between the floor surface and the pad PT, a suitable polishing effect and a cleaning effect can be exhibited.

FIGS. 7A and 7B are graphs showing the control characteristics of the present invention. FIG. 7A is a graph showing the relationship between the slip and the number of revolutions of the motor 10, and FIG. (C) is a graph showing the relationship between the input current and the number of revolutions. In these figures, T1 and T
2 and T3 show curves at high speed, middle speed, and low speed.

FIG. 8 shows the rated voltages of 100 V and 90 V.
FIG. 9 is a comparison diagram showing motor performance when 90 V is applied to the motor of FIG.

Next, the processing operation of the motor drive control device for a floor polishing cleaner according to the present invention will be described with reference to the flowcharts shown in FIGS.

(1) Step S1: The rotation type (high speed / medium speed / low speed) of the motor 10 commanded by the speed command select switch 26 is read. (2) Step S2: Speed data corresponding to the commanded rotation type is read. (3) Step S3: It is determined whether or not the commanded speed is "high speed". If "high speed", the process proceeds to step S4, and if not, the process proceeds to step S6. (4) Step S4: The target frequency of the motor 10 is set to "high speed", and the process proceeds to step S5. (5) Step S5: The control data of the control unit 25 is set to “high speed”, and the process proceeds to step S11. (6) Step S6: It is determined whether or not the designated speed is "medium speed". If the speed is "medium speed", the process proceeds to step S7. If not, that is, if the speed is "low speed", the process proceeds to step S7. Proceed to S9. (7) Step S7: The target frequency of the motor 10 is set to “medium speed”, and the process proceeds to step S8. (8) Step S8: The control data of the control unit 25 is set to “medium speed”, and the process proceeds to step S11. (9) Step S9: The target frequency of the motor 10 is set to "low speed", and the process proceeds to step S10. (10) Step S10: The control data of the control unit 25 is set to "low speed", and the process proceeds to step S11.

(11) Step S11: The control data during acceleration is read. (12) Step S12: The control of the motor 10 by the inverter 23 is started. (13) Step S13: The acceleration time of the motor 10 is calculated from the preset acceleration time constant and the target frequency, and the process proceeds to step S14. (14) Step S14: The acceleration of the motor 10 is controlled according to a preset acceleration time constant, and the process proceeds to the next step S15. (15) Step S15: It is determined whether or not the acceleration time has elapsed. If the acceleration time has elapsed, the process proceeds to step S16, and if not, the process proceeds to step S18. (16) Step S16: As the acceleration time elapses, the acceleration control of the motor 10 ends, and the next step S17
Proceed to. (17) Step S17: After discarding the acceleration data read in step S11 and rereading the normal control data, the process proceeds to step S22 shown in FIG. (18) Step S18: If NO is determined in the step S15, the actual rotation speed of the motor 10 measured by the encoder 27 is read, and the process proceeds to the next step S19. (19) Step S19: Motor 10 during acceleration
It is determined whether or not the difference between the target rotation speed and the actual rotation speed has reached an arbitrary value or more. If YES, the process proceeds to the next step S20. If NO, that is, if the difference is within the arbitrary value, the above-described process is performed. Proceeding to step S14, the processing is continued. (20) Step S20: If it is determined in step S19 that the value exceeds an arbitrary value (predetermined value), the slip is controlled by adding a predetermined slip value to the frequency corresponding to the motor speed, and the control is performed by this control. After processing to drive and control the motor 10 with the new inverter output frequency, the process returns to step S15 again and continues.

(22) Step S22: The control drive of the motor 10 is performed with normal control data in each speed mode (high speed / medium speed / low speed). (23) Step S23: The actual rotation speed of the motor 10 measured by the encoder 27 is read, and the next step S2
Proceed to 3. (24) Step S24: It is determined whether or not the difference between the target rotation speed and the actual rotation speed of the motor 10 during normal operation has reached an arbitrary value or more. If YES, the next step S2 is performed.
The process proceeds to step S5, and if NO, the process returns to step S22 to continue the process. (25) Step S25: A process of adding a predetermined slip value to the frequency corresponding to the motor rotation speed to perform a slip constant control, and performing a process of controlling the drive of the motor 10 with the new inverter output frequency calculated by this control. (26) Step S26: The number of revolutions of the motor 10 driven and controlled at the new inverter output frequency is read, and the process proceeds to the next step S27.

(27) Step S27: It is determined whether or not the speed of the motor 10 instructed in step S1 is "high speed". If YES, the process proceeds to step S28 and N
In the case of O, the process proceeds to step S30. (28) Step S28: It is determined whether or not the actual rotation speed of the motor 10 measured by the encoder 27 is "high speed". If YES, the process proceeds to the next step S29, and if NO, the process proceeds to a step S31. That is, as described later, the actual rotation speed of the motor 10 is reduced by one stage to “medium speed”. (29) Step S29: After setting the control data of the control unit 25 to "high speed", the process returns to the above-described step S24 to repeat the processing. (30) Step S30: It is determined whether or not the speed of the motor 10 commanded in step S1 is "medium speed".
In the case of YES, the process proceeds to step S31, and in the case of NO (low speed), the process proceeds to step S34. (31) Step S31: It is determined whether or not the actual rotation speed of the motor 10 is "medium speed". If YES, the process proceeds to step S32; if NO, the process proceeds to "low speed" processing from step S34. . (32) Step S32: After setting the control data of the control unit 25 to "medium speed", the process proceeds to the next step S33. (33) Step S33: It is again confirmed whether or not the speed command in step S1 is "medium speed". If YES, the process returns to the above-described step S24. If NO, the process returns to the above-described step S25 to perform the process. Repeat. (34) Step S34: If it is determined in step S30 that the speed is "low speed", the actual rotation speed of the motor 10 is "low speed".
Is determined, and in the case of YES, step S3
5, but if NO (for example, 50
%, If the state continues for 5 seconds or more), the process proceeds to step S37 to stop the control, stop the rotation of the motor 10 (pad PT), and stop the operation. (35) Step S35: After setting the control data of the control unit 25 to "low speed", the process proceeds to the next step S26. (36) Step S36: It is again confirmed whether or not the speed command of step S1 is "low speed". If YES, the process returns to the step S24 described above. If NO, the process returns to the step S25 described above and repeats the process. .

It should be noted that the flowchart described above shows that when the actual rotation speed of the motor 10 falls below the set frequency,
Although only the processing procedure of switching the setting to a frequency one step lower is described, in the present invention, the actual rotation speed of the motor 10 is, for example, 103% or more of the set frequency, and the state is 3
If it continues for more than one second, its setting is switched to the frequency one step higher (low speed → medium speed / medium speed → high speed) and the motor 10
Drive control mechanism.

Further, the configuration in which the set frequency of the motor 10 can be set to three stages of "high speed", "medium speed" and "low speed" is also an example of the embodiment, and the number of stages is four, five or five. It is also possible to set more than that.

[0045]

The motor drive control device for a floor polishing cleaner according to the present invention is as described above. When the pad is new, the motor is controlled so that "slip control" is activated so as not to exceed an arbitrary current value. Since the actual rotation speed of the motor is lower than the set rotation speed, it is possible to always work with the set current value MAX. Also, as the pad becomes thinner, the resistance decreases and the current decreases, but the current decreases. Because the actual rotation speed is increased, the suction force on the floor surface is increased, and the pad pressure is increased, so that the polishing effect can be prevented from being reduced.Therefore, even when the pad is new or old, a constant high polishing effect, or , Can exhibit a cleaning effect.

Further, according to the present invention, by controlling the motor slip constant, flat current suppression is made possible, and the vector control is optimized to reduce the motor slip without sacrificing the efficiency. As a result, there is an advantage that the output does not decrease near the set number of times, and an advantage that the polishing operation or the cleaning operation can be performed more efficiently by applying a high pad pressure in a high rotation range.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a floor polishing machine provided with a motor drive control device according to the present invention.

FIG. 2 is a plan view of the floor polishing machine shown in FIG. 1;

FIG. 3 is a side sectional view of an essential part for explaining an internal structure of the floor polishing machine shown in FIG. 1;

FIG. 4 is a block diagram illustrating an electrical configuration of the present invention.

FIG. 5 is a flowchart illustrating a processing procedure of motor control according to the present invention.

FIG. 6 is a flowchart illustrating a continuation of the flowchart shown in FIG. 5;

7A and 7B are control characteristic diagrams of the present invention, wherein FIG. 7A is a graph illustrating the relationship between motor slip and rotation speed, FIG. 7B is a graph illustrating the relationship between motor torque and rotation speed, and FIG.
Is a graph illustrating the relationship between input current and rotation speed.

FIG. 8 shows 90 to each motor of rated voltage 100V and 90V.
FIG. 4 is a comparative diagram showing motor performance when V is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polishing cleaner 1A Aircraft body 2S Traction spring 10 Motor PT pad 23 Inverter (driver part) 24 Power supply part 25 Control part 27 Encoder

Continued on the front page (72) Inventor Yuji Makishima 1-6-2 Shintoda, Hamamatsu-shi, Shizuoka Prefecture Amano Co., Ltd. (72) Inventor Yoshinori Ito 1-6-2, Shintoda, Hamamatsu-shi, Shizuoka Amano Co., Ltd. F-term (reference) in the Tsuda Techno Office of the formula company 5H576 AA11 AA20 CC05 DD02 DD04 EE01 EE03 GG02 GG07 HB01 JJ03 LL07 LL30 MM05

Claims (6)

[Claims] 1. A three-phase induction motor is driven via a single-phase AC 100V input, three-phase AC output sine wave digital type vector control type inverter to rotate a pad to polish or clean a floor surface. On the other hand, the actual rotational speed of the motor is determined using a rotation detector, and the slip frequency of the motor is determined from a predetermined set frequency, and a new inverter is determined based on the actual rotational speed of the motor and the slip frequency of the motor. By calculating and outputting the output frequency,
A floor polishing cleaner configured to drive the motor, wherein when the slip of the motor is within a predetermined set value,
When the motor is driven at a predetermined frequency and the slip of the motor exceeds a predetermined value, a frequency obtained by adding a predetermined slip value to a frequency corresponding to the motor rotation speed is newly output as an inverter output frequency, and the motor is drive-controlled. A motor drive control device for a floor polishing machine, wherein the motor drive control device comprises: 2. Set the motor frequency to at least high speed.
Set to multiple stages of medium speed and low speed, when the actual rotation speed of the motor is out of the predetermined range of the predetermined frequency, correct output to the inverter output frequency one step lower or higher than the predetermined set frequency, and The motor drive control device for a floor polisher according to claim 1, wherein the motor is controlled to drive. 3. The motor drive control device for a floor polishing machine according to claim 1, wherein the inverter output is set to a three-phase alternating current of 90 V, and the rated voltage of the three-phase induction motor is set to 90 V. 4. The apparatus according to claim 1, wherein the operating frequency of the motor at the time of starting the operation is increased proportionally from the start until the predetermined frequency is reached, and at the same time, a control for keeping the slip constant is performed. 2. A motor drive control device for a floor polishing cleaner according to claim 1. 5. The motor drive control device for a floor polishing machine according to claim 1, wherein the operation of the motor is stopped when the number of rotations of the motor falls below a preset value. 6. A pad rotated by a motor is provided with an upward supporting force separated from a floor surface, and a plurality of minute spaces are provided inside the pad. Motor drive controller for floor polisher cleaning machine.