JP2005051915A - Motor control circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor control circuit capable of varying the starting torque of a motor depending on the rotational direction thereof and power consumption and generation of sound, vibration and heat from the motor can be suppressed in an apparatus comprising a capacitor induction motor as a drive source. <P>SOLUTION: When a motor is started in the forward rotational direction, capacitance of a capacitor is set higher than a capacitance required for rated operation of the motor only for the count of a timer after starting the motor, and the motor is supplied with a current between the rated current and an allowable current so that it is operated with a starting torque higher than that in rated operation. Upon ending count, the motor is operated while setting the capacitance of the capacitor at a level required for rated operation of the motor and when the motor is started in reverse rotational direction, the motor is operated while setting the capacitance of the capacitor at a level required for rated operation of the motor from the start. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor control circuit that performs control to increase the starting torque of a motor in accordance with the rotation direction of the motor in a device including a capacitor induction motor used as a drive source.

  In the prior art, a base frame, a table part disposed above the base frame, a connecting means for connecting the table part to the base frame so that the table part can be raised and lowered, and an extension direction of the table part. And a motor provided with a pinion that meshes with the rack, and an upper and lower limiter for obtaining a positioning signal in the up-and-down direction of the table part, and is arranged on the table part. In the table lift having the guide means, the motor is a capacitor induction type motor, and the capacity of the capacitor connected to the winding is changed in accordance with the ascending / descending direction of the table unit, and when the ascending direction is reached There is a table lift with a large capacity.

According to this technique, the power consumption increases because the motor is always operated while the capacity of the capacitor is increased while the table portion is raised. At this time, since the motor operates at a higher torque than usual, noise, heat and vibration are generated from the motor significantly, making the motor more fragile and transmitting sound and vibration to the table lift user. It can't be denied that it causes discomfort.
JP 2002-308600 A

  Therefore, the present invention has been made in view of the above circumstances, and according to the rotation direction when starting the motor, it is possible to start the motor by changing the starting torque, power consumption of the motor and sound from the motor, An object is to provide a motor control circuit capable of suppressing vibration and heat generation.

In the motor control circuit of a device having a capacitor induction motor used as a drive source, when the motor is started in the forward rotation direction, the invention of claim 1 is only during the counting time by the timer from the start of the motor. The capacitance of the capacitor is set to be larger than the capacitance of the capacitor that causes the motor to perform rated operation, and the motor is energized with a current that is greater than or equal to the rated current value of the motor and less than the allowable current value. When the motor is operated with higher torque operation and the counting is completed, the capacitor is operated at the rated capacitance of the capacitor, and the motor is started in the reverse rotation direction. , Let the motor operate at the rated capacitance of the capacitor from the time the motor starts Motor is operated as the capacitance of the capacitor, and wherein changing the motor starting torque by the rotation direction of the motor.
The invention of claim 2 operates the motor with the count time of the timer as the capacitance of the capacitor that causes the motor to operate at the rated capacitance from the start of the motor in high torque operation with increased motor start torque. More than the time required to reach the number of revolutions showing a desired torque value when it is applied.

Therefore, according to the invention of claim 1, when starting the motor in the forward rotation direction, the capacitance of the capacitor is made larger than the capacitance of the capacitor that causes the motor to perform rated operation only for the count time of the timer, The motor is energized with a current that is greater than or equal to the rated current value of the motor and less than or equal to the allowable current value, and the motor is driven at a high torque operation in which the starting torque is higher than the starting torque in the rated operation of the motor. Then, after the timer count is completed, it is possible to compensate for the lack of starting torque of the motor by operating the motor as the capacitance of the capacitor that causes the motor to operate at the rated capacitance. Therefore, by letting the motor operate at high torque only during the count time of the timer, the power consumption of the motor can be reduced compared to the case of always operating at high torque, and the motor generates heat, vibration, and sound. Can be suppressed.
Also, when starting the motor in the reverse rotation direction, start the motor in the forward rotation direction by operating the motor as the capacitance of the capacitor that causes the motor to operate at the rated capacitance from the start of the motor. The motor can be started with a starting torque different from the starting torque at the time of starting.
Furthermore, according to the invention of claim 2, in the high torque operation in which the motor start torque is increased, the count time of the timer is the electrostatic capacity of the capacitor that causes the motor to operate at the rated capacitance of the capacitor from the start of the motor. The capacity is equal to or longer than the time required to reach a rotational speed that shows a desired torque value when the motor is operated. When the count time of the timer is set in this way, even if the motor is operated from the high torque operation state as the capacitor capacitance that causes the motor to operate at the rated capacitance of the capacitor, the motor does not exceed the desired torque value. It will surely have torque.

  An embodiment of a motor control circuit according to the present invention will be described with reference to the drawings. FIG. 1 is a relay sequence diagram showing a motor control circuit. FIG. 2 is a torque curve diagram in the rated operation of the motor. FIG. 3 is a torque curve diagram in high torque operation in which the starting torque of the motor is increased.

  The motor control circuit 1 includes a capacitor induction motor 2 used as a drive source, a forward rotation switch 3, a reverse rotation switch 4, a plurality of electromagnetic relays X1, X2, and X3, a timer T1, and capacitors C1 and C2. It is the relay sequence circuit comprised by this. The connection relationship will be described below based on the sequence operation.

First, in order to start the motor 2 in the forward rotation direction, the forward rotation switch 3 is turned on while the reverse rotation switch 4 is off. When the forward rotation switch 3 is turned on, the electromagnetic relay X1 is energized via the contact b of the electromagnetic relay X2, and the electromagnetic relay X1 is excited. When the electromagnetic relay X1 is excited, the contact a of the electromagnetic relay X1 is turned on and the contact b is turned off. The reverse switch 4 and the electromagnetic relay X2 are electrically disconnected from the motor control circuit 1 by turning off the b contact of the electromagnetic relay X1. When the contact a of the electromagnetic relay X1 is turned on, the timer T1 is energized and the timer T1 starts counting. At the same time, the capacitors C1 and C2 connected in parallel between the contact a of the electromagnetic relay X1 and the double winding 2a of the motor 2 are energized, the double winding 2a is energized, and the main winding 2b of the motor 2 is also energized. Is energized. Note that the capacitor C2 is energized through the b contacts of the electromagnetic relays X2 and X3. Then, when the main winding 2b and the multiple winding 2a of the motor 2 are energized, the motor 2 is started in the forward rotation direction. At this time, the capacitance of the capacitor C1 is a capacitance that causes the motor 2 to perform a rated operation. The capacitance of the capacitor C2 is optimally such that the starting torque of the motor 2 by the capacitors C1 and C2 is approximately equal to the rated torque during operation of the motor 2 by the capacitor C1. Note that it is important to select the capacitance of the capacitor C2 so that the current value supplied from the capacitors C1 and C2 to the motor 2 does not exceed the allowable current value of the motor 2.
As a result, the motor 2 is energized to the composite winding 2a from the capacitors C1 and C2 connected in parallel to the motor 2 with a current not less than the rated current value of the motor 2 and not more than the allowable current value. High torque operation with higher starting torque is performed.
Therefore, it is possible to eliminate the shortage of torque when starting the motor 2 in the forward rotation direction, and it is possible to eliminate the defect that the operating portion that is operated by the motor 2 of the device including the motor 2 does not operate.

The timer T1 is used as an on-delay timer. When the count of the timer T1 is completed, the contact a of the timer T1 is turned on and the electromagnetic relay X3 is excited. As a result, the contact b of the electromagnetic relay X3 connected between the contact a of the electromagnetic relay X1 and the capacitor C2 is turned off, and power transmission to the capacitor C2 is stopped. Therefore, after the completion of the timer T1, the motor 2 is shifted to the operation using only the capacitor C1.
At this time, the count time of the timer T1 is equal to or longer than the time from when the motor 2 is started to when the motor 2 is operated by the capacitor C1 to reach the rotation speed indicating a desired torque value in the high torque operation of the motor 2. It is said. As a result, the motor 2 is energized with a current not less than the rated current value of the motor 2 and not more than the allowable current value only during a time period when the torque of the motor 2 operated by the capacitor C1 alone is low. Therefore, it is possible to compensate for the torque shortage at the time of starting the motor 2. Further, when the operation state of the motor 2 is switched from the high torque operation state to the operation state using only the capacitor C1, the motor 2 does not run out of torque.

  Further, to stop the forward rotation of the motor 2, the hand is removed from the forward rotation switch 3, and the forward rotation switch 3 is turned off. When the forward rotation switch 3 is turned off, power transmission to the electromagnetic relay X1 is stopped, the contact a of the electromagnetic relay X1 is turned off, and power transmission to the motor 2 and the timer T1 is stopped. Therefore, the motor 2 stops naturally. Further, the b contact of the electromagnetic relay X1 is turned on, and the motor control circuit 1 is returned to the state before the motor 2 is operated.

Next, to start the motor 2 in the reverse rotation direction, the reverse switch 4 is turned on while the forward switch 3 is off. When the reverse switch 4 is turned on, the electromagnetic relay X2 is energized through the b contact of the electromagnetic relay X1, and the electromagnetic relay X2 is excited. When the electromagnetic relay X2 is excited, the contact a of the electromagnetic relay X2 is turned on and the contact b is turned off. When the b contact of the electromagnetic relay X2 is turned off, the forward rotation switch 3, the electromagnetic relay X1, and the capacitor C2 are electrically disconnected from the motor control circuit 1. When the contact a of the electromagnetic relay X2 is turned on, the main winding 2b of the motor 2 is energized through the capacitor C1, and the compound winding 2a is energized. Thereby, the motor 2 is started in the reverse rotation direction only by the capacitor C1 from the start. Therefore, the motor 2 is started with a starting torque different from the starting torque when the motor 2 is rotated forward.
In order to stop the reverse rotation of the motor 2, the hand is removed from the reverse rotation switch 4 and the reverse rotation switch 4 is turned off. When the reverse rotation switch 4 is turned off, power transmission to the electromagnetic relay X2 is stopped, the contact a of the electromagnetic relay X2 is turned off, and power transmission to the motor 2 is stopped. Therefore, the motor 2 stops naturally. Further, the contact b of the electromagnetic relay X2 is turned on, and the motor control circuit 1 is returned to the state before the motor 2 is operated.

Next, the operation of the motor 2 in the operation as described above will be verified from FIG. 2 and FIG.
FIG. 2 is a torque curve diagram in the rated operation of the motor, and shows the torque change from the start in the operation of the motor 2 by the capacitor C1. FIG. 3 is a torque curve diagram in high torque operation in which the starting torque of the motor is increased, and shows a torque change from the starting time in the operation of the motor 2 by the capacitors C1 and C2.
As shown in FIG. 2, the motor 2 is a motor that performs rated operation with a capacitor C1 (20 μF). The starting torque is about 0.3 N · m at a power supply of 100 V / 60 Hz. When starting up the motor 2 in the forward rotation direction, the motor 2 is energized via the capacitors C1 and C2 (combined capacitance 40 μF) by connecting the capacitor C2 (20 μF) in parallel with the capacitor C1. As shown in FIG. 3, the motor 2 is started with a starting torque of about 0.8 N · m at a power supply of 100 V / 60 Hz. Therefore, under this condition, the starting torque of the motor 2 can be increased by about 2.5 times the starting torque in the rated operation of the motor 2.
Note that, when the motor 2 is operated at a high torque, the power consumption is increased compared to the rated operation. However, when the motor 2 reaches the rotational speed at which the necessary torque can be obtained in the operation state by the capacitor C1 from the high torque operation state of the motor 2 by the timer T1, the operation state by the capacitor C1 alone is switched. Substantially the high torque operation time can be on the order of a few seconds of the comma. Therefore, the power consumption in the motor control circuit 1 can be made almost the same as the power consumption in the operation of the motor 2 using only the capacitor C1 from the start.
Then, when starting the motor 2 in the reverse rotation direction, the motor 2 starts the operation with only the capacitor C1 from the start time, so that the starting torque starts the motor 2 in the forward rotation direction as shown in FIG. The motor 2 can be started at less than half of the starting torque at the time of starting.
The illustrated numerical values are not limited to these, and are selected according to the capacity of the motor 2 and the work to be performed. Therefore, the capacitors C1 and C2 may be selected according to the torque required when starting the motor 2. At this time, it is important to select the capacitors C1 and C2 so that the current value supplied to the motor 2 by the capacitors C1 and C2 does not exceed the allowable current value of the motor 2. Also, the count time of the timer T1 may be determined by testing and measuring the time to reach the rotational speed showing a desired torque value when the motor 2 is operated by the capacitor C1 in the high torque operation.

In the present embodiment, the timer T1 is used as an on-delay timer, but a motor control circuit that performs the same control as the motor control circuit 1 can be configured by using it as an off-delay timer. Although not shown, in this case, the b contact of the timer T1 may be connected instead of the b contact of the electromagnetic relay X3. According to this, the electromagnetic relay X3 can be removed, and the connection space of the motor control circuit 1 can be reduced.
In this embodiment, the high torque operation is performed when starting the motor 2 in the forward rotation direction. However, when starting the motor 2 in the reverse rotation direction, the high torque operation is performed and the forward rotation direction is performed. Then, it is also possible to control the motor 2 so that the operation is performed only by the capacitor C1 from the start. Although not shown, in this case, the a contact of the electromagnetic relay X2 is connected instead of the a contact of the electromagnetic relay X1 connected to the timer T1. Then, instead of the b contact of the electromagnetic relay X2 connected between the capacitor C2 and the a contact of the electromagnetic relay X1, the b contact of the electromagnetic relay X1 may be connected.
Furthermore, in the present embodiment, the b contact of the electromagnetic relay X2 is connected between the forward rotation switch 3 and the electromagnetic relay X1, but the same control as the motor control circuit 1 is performed even if the wiring is rearranged as follows. A motor control circuit to perform can be configured. Although not shown, the b contact of the electromagnetic relay X2 and the normal rotation switch 3 may be replaced and connected, or the b contact of the electromagnetic relay X2 and the electromagnetic relay X1 may be replaced and connected. Further, the forward switch 3 and the electromagnetic relay X1 may be replaced and connected. Similarly, the connection between the reverse switch 4 and the b contact of the electromagnetic relay X1 and the electromagnetic relay X2 and the connection between the b contact of the electromagnetic relays X2 and X3 and the capacitor C2 may be replaced and connected.
In the present embodiment, the motor 2 is operated in a desired direction by the forward rotation switch 3 or the reverse rotation switch 4, although not shown, a selection switch for selecting the rotation direction of the motor 2. The motor 2 may be rotated in a desired direction by selecting the rotation direction and turning on a switch for operating the motor 2. Alternatively, each time the switch for operating the motor 2 is turned on, the rotation direction of the motor 2 may be switched and the motor 2 may be operated.
Depending on the capacity and type of power supply, the contact capacity and type of electromagnetic relays and timers, or whether the electromagnetic relays and timers are for direct current or alternating current, contacts such as transformers, rectifiers and other electromagnetic relays can be used. By interposing, a control circuit that functions similarly to the motor control circuit 1 of the present embodiment can be configured.

According to this motor control circuit 1, when the motor 2 is started in the forward rotation direction, a current not less than the rated current value of the motor 2 and not more than the allowable current value is supplied to the motor 2 from the capacitors C1 and C2 only during the count time of the timer T1. Energize to drive the motor 2 at high torque. Then, after the timer T1 has been counted, the motor 2 can be operated only by the capacitor C1 to compensate for the start-up torque shortage of the motor 2. Therefore, by performing the high torque operation only for the count time of the timer T1, the power consumption of the motor 2 can be suppressed as compared with the case of always performing the high torque operation, and the heat, vibration, and sound from the motor 2 can be suppressed. Occurrence can be suppressed. As a result, it is possible to make the motor 2 difficult to break, and to suppress the user's anxiety and discomfort to the device due to vibrations and sounds generated from the motor 2 of the device using the motor 2 as a drive source.
In addition, by supplementing the starting torque of the motor 2, it is not necessary to select a motor with a large starting torque, and it is possible to select the motor 2 that shows the torque value required by the rated torque, thereby reducing the cost of the motor 2. In addition, the installation space for the motor 2 can be reduced.
Furthermore, when starting the motor 2 in the reverse rotation direction, the motor 2 is operated only by the capacitor C1 from the start of the motor 2, so that the start-up torque differs from the start torque when starting the motor 2 in the forward rotation direction. The motor 2 can be started by torque. Therefore, when the required starting torque varies depending on the rotation direction of the motor 2, if a large starting torque is required, the motor 2 is operated at a high torque, and the starting torque of the rated operation is sufficient. By operating the motor 2 with only the capacitor C1 for rated operation of the motor 2, it is possible to prevent the operating part that is operated by the motor 2 of the device from starting or suddenly starting, It can be started smoothly.
The count time of the timer T1 is set to be equal to or longer than the time from when the motor 2 is started to when the motor 2 is driven by the capacitor C1 until the rotation speed showing a desired torque value is reached in the high torque operation of the motor 2. Yes. When the count time of the timer T1 is set in this way, the motor 2 surely has a torque equal to or greater than the desired torque value even when the operation state of the motor 2 is shifted from the high torque operation state to the operation state using only the capacitor C1. become. Therefore, since the motor 2 does not run out of torque when the operation state is shifted and the motor 2 can be prevented from stopping or stopping, the movement of the operating part operated by the motor 2 of the device can be maintained. It is possible to suppress anxiety and discomfort for the device user.

  Next, a wheelchair elevator will be described as an embodiment of a device using the motor control circuit according to the present invention as Example 1 with reference to the drawings. FIG. 4 is an overall front view showing a wheelchair elevator. FIG. 5 is an overall left side view showing the elevator for a wheelchair. FIG. 6 is an explanatory view showing the configuration of the wheelchair elevator. FIG. 7 is a cross-sectional view of the main part showing the drive unit. FIG. 8 is a cross-sectional view of the main part showing the fixing part. FIG. 9 is a relay sequence diagram showing the motor control circuit.

  The wheelchair lift 5 includes a base frame 6, a table portion 7 disposed above the base frame 6, a sliding portion 8 that slides the table portion 7 in the vertical direction with respect to the base frame 6, and the sliding It is mainly composed of a drive unit 9 for sliding the unit 8 up and down and a fixed unit 10.

First, the base frame 6 will be described.
In the base frame 6, a horizontal pipe 6b in the left-right direction is fixed to the front end of the vertical pipes 6a, 6a in the front-rear direction separated by a predetermined amount in the left-right direction, and a horizontal pipe 6c in the left-right direction is fixed to the rear part. In addition, a substantially rectangular frame is configured in plan view, and a pair of square pipes having a predetermined height corresponding to the height at which the table portion 7 is raised and lowered on the upper surfaces of both end portions of the horizontal pipe 6c on the rear side. The masts 6d and 6d are fixed to each other.
Further, lid plates 6e, 6e are fixed to upper ends of the pair of masts 6d, 6d of the base frame 6, and screw portions 6f, 6f,... Are provided on the lid plates 6e, 6e. . And the plate 6g which installs the drive part 9 is adhering to the upper surface of the said horizontal pipe 6c between a pair of masts 6d and 6d.

Next, the sliding part 8 will be described.
The sliding portion 8 includes connecting pipes 8b, 8b, 8b in the left-right direction between the sliding pipes 8a, 8a formed of a pair of square pipes inserted into the outer periphery of the pair of masts 6d, 6d of the base frame 6, respectively. A plurality of fixed pipes are fixed at a predetermined interval, and a female screw cylinder 8c having an axial center in the vertical direction is fixed substantially at the center of the connecting pipes 8b, 8b.
Further, in some of the connecting pipes 8b, 8b of the sliding portion 8, air holes 8d, 8d,... Having a vertical axis are spaced from the center of the connecting pipes 8b, 8b by a predetermined distance. The nut members 8e, 8e,... Are fixed to the lower portions of the holes 8d, 8d,. Screw portions 8f and 8f having axial centers in the front-rear direction are provided below the front surfaces of the sliding pipes 8a and 8a.
The sliding portion 8 is configured such that the sliding pipes 8a and 8a are inserted through the pair of masts 6d and 6d of the base frame 6 so that the sliding portion 8 smoothly slides up and down along the masts 6d and 6d without rattling. It is movably attached to the base frame 6. At this time, a lining (not shown) or a roller (not shown) is attached to the contact surface of the sliding pipes 8a, 8a with the masts 6d, 6d so that the sliding portion 8 can slide up and down more smoothly. ing.

Next, the drive unit 9 and the fixed unit 10 that slide the sliding unit 8 in the vertical direction will be described.
First, the drive unit 9 will be described.
A gear member 12 is fixed to a rotating shaft of a capacitor induction motor 11 incorporating a brake B used as a driving source, and a rotating cylinder 13 having a vertical axis provided with a gear member 13a meshing with the gear member 12 is pivoted. The holding part 14 is held so as to be rotatable around the center. Then, the holding portion 14 is fixed to the plate 6 g of the base frame 6. Thereafter, a shaft screw 15 is screwed into the female screw cylinder 8c of the sliding portion 8 and inserted into a hole 13b formed on the axis of the rotary cylinder 13 from the upper end of the rotary cylinder 13, and a bolt 16 is inserted. And the nut 17.
A control box 19 provided with a motor control circuit 18 for controlling the motor 11 is arranged on the plate 6g of the base frame 6. Thereafter, the motor 11, the holding unit 14, and the cover 20 that covers the control box 19 are attached, and the drive unit 9 is configured.
Therefore, the drive unit 9 is configured to rotate the shaft screw 15 together with the rotating cylinder 13 by the motor 11 around the axis of the shaft screw 15 coinciding with the axis of the rotating cylinder 13.

The upper end of the rotating cylinder 13 protrudes from the upper surface of the cover 20, and the shaft screw 15 can be fixed to the rotating cylinder 13 without removing the cover 20.
In addition, the holding portion 14 first allows the bearing member 21 to be inserted under the enlarged diameter portion 13c of the rotary cylinder 13 provided with the enlarged diameter portion 13c at a substantially intermediate portion. Then, the lower end portion of the rotating cylinder 13 is inserted through a substantially concave cylindrical holder 22 in a cross-sectional view. Thereafter, the fixing pieces 23, 23 that prevent the rotating cylinder 13 from coming off from the tube receiver 22 are fitted on the outer diameter of the enlarged diameter portion 13 c of the rotating cylinder 13, the bearing member 21, and the cylinder receiver 22. The flanges 23a, 23a provided on the fixing pieces 23, 23 are fixed to the plate 6g of the base frame 6 with bolts 24, 24,... To hold the rotary cylinder 13. Has been.
Further, although not shown, one end of a controller that performs the raising / lowering operation of the wheelchair elevator 5 is connected to the control BOX 19, and when the user is riding on the table unit 7, It is arranged within the reach.

Next, the fixing unit 10 has an upper end side of the shaft screw 15 of the driving unit 9, a holding unit 25 that rotatably holds the shaft screw 15, and the holding unit 25 is fixed, and the mast of the base frame 6 is fixed. 6d, 6d is composed of a connecting frame 26 that connects upper end portions.
The connection frame 26 includes a lower pipe 26a disposed between the masts 6d and 6d of the base frame 6 and an upper pipe 26b which is passed to the upper ends of both the masts 6d and 6d. Holes 26c, 26c,... For fastening to the upper ends of the masts 6d, 6d are formed at both ends of the upper pipe 26b. A hole portion 26d into which the holding portion 25 can be fitted from below the lower pipe 26a is formed at a substantially intermediate portion between the upper pipe 26b and the lower pipe 26a. Further, holes 26e, 26e,... Are formed around the holes 26d on the lower end surface of the lower pipe 26a, and nuts for fixing the holding parts are formed above the holes 26e, 26e,. The members 26f, 26f,... Are fixed.
The holding part 25 first inserts the bearing member 28 under the enlarged diameter part 27b of the rotary cylinder 27 provided with the hole part 27a through which the shaft screw 15 of the driving part 9 can be inserted. Then, the substantially concave fixing body 29 in the sectional view is inserted into the rotating cylinder 27 from the upper end side of the rotating cylinder 27 so as to cover the bearing member 28 and the enlarged diameter portion 27b of the rotating cylinder 27. After that, a hole 30a through which the shaft screw 15 is inserted is bored, and the shaft 30 of the hole 30a is formed on the plate 30 provided with the screws 30b, 30b,... Around the hole 30a. The core, the rotating cylinder 27, the bearing member 28, and the fixed body 29 are aligned with each other, and are arranged respectively. .. And the screw holes 30b, 30b,... Of the plate 30 are made to coincide with each other so that the bolts 31, 31 are formed. ,... Are screwed together, and the holding portion 25 is configured.
Thereby, the rotary cylinder 27 of the holding part 25 can be rotated around the axis of the rotary cylinder 27.

  The upper end portion of the shaft screw 15 of the drive unit 9 is inserted into the hole portion 30a of the plate 30 of the holding portion 25 and the hole portion 27a of the rotary cylinder 27 thus configured, and the shaft screw 15 and the rotary cylinder 27 are connected to the bolt. Fix with 32 and nut 33. Then, the holding portion 25 is fitted into the hole portion 26d of the connection frame 26, and the holes 30c, 30c,... For fixing to the connection frame 26 provided on the plate 30 of the holding portion 25 are connected. The bolts 34, 34,... Are screwed onto the hole portions 26e, 26e,... Of the frame 26 and the nut members 26f, 26f,. To fix. Thereafter, the connecting frame 26 is screwed to the upper end of the base frame 6 with bolts 35, 35,.

Therefore, the drive unit 9 and the fixed unit 10 have holding units 14 and 25 that respectively hold both end portions of the shaft screw 15 so as to be rotatable about the axis of the shaft screw 15 of the drive unit 9. The motor 11 provided is configured to rotate the shaft screw 15. Therefore, when the shaft screw 15 rotates in the sliding portion 8, the pair of masts 6d and 6d of the base frame 6 and the screw relationship between the shaft screw 15 and the female screw cylinder 8c of the sliding portion 8 are as follows. The sliding portion 8 slides up and down without rotating together with the shaft screw 15.
The motor control circuit 18 provided in the control BOX 19 will be described later.

Next, the table part 7 which is attached to the sliding part 8 and on which a user gets on will be described.
The table portion 7 is composed of a base frame 36 fixed to the sliding portion 8 and a table 37 on which a user gets on.
In the base frame 36, first, a plurality of longitudinal pipes 38b, 38b,... In the front-rear direction are fixed at predetermined intervals between the horizontal pipes 38a, 38a in the left-right direction spaced apart by a predetermined interval in the front-rear direction. A substantially rectangular frame 38 is configured in plan view. Fixed plates 39 are fixed to both ends of the rear side pipe 38a of the frame 38. The fixing plates 39, 39 are provided with hole portions 39a, 39a that coincide with the axial centers of the screw portions 8f, 8f provided below the front surfaces of the sliding pipes 8a, 8a of the sliding portion 8. . Then, supports 40, 40 for attaching the frame body 38 to the connecting pipes 8b, 8b of the sliding portion 8 are fixed to the rear side horizontal pipe 38a of the frame body 38 at a predetermined interval. A plurality of hook members 40a, 40a,... That can be hooked from above the connecting pipes 8b, 8b of the sliding portion 8 are fixed to the supports 40, 40. The hook members 40a, 40a,... Have holes 8d, 8d,... Provided in the connecting pipes 8b, 8b and the holes 40b used for fixing the nut members 8e, 8e,. 40b,... Are formed, and the base frame 36 is configured.
The table 37 is a plate material that is placed so as to cover the frame body 38 of the base frame 36 from above, and the width in the front-rear direction is substantially equal to the frame body 38, and the width in the left-right direction is greater than that of the frame body 38. The size is protruding.
And the table 37 is comprised by arrange | positioning the table 37 to the base frame 36, and fixing with a screw member (illustration omitted).

The table portion 7 configured as described above is first hooked on the connecting pipes 8b and 8b of the sliding portion 8, and the hole portions of the hook members 40a and 40a provided in the support tools 40 and 40 of the table portion 7 are used. Are aligned with the holes 8d, 8d,... And nut members 8e, 8e,... Provided in the connecting pipes 8b, 8b of the sliding portion 8. , ... are screwed. Then, the holes 42a, 39a provided on the sliding pipes 8a, 8a of the sliding portion 8 are aligned with the holes 42a, 39a provided in the fixing plates 39, 39 of the table portion 7, and the bolts 42, 42 are attached. The table portion 7 is fixed to the sliding portion 8 by screwing. Therefore, the table part 7 moves up and down integrally with the sliding part 8.
In addition, the sliding part 8 and the table part 7 in Example 1 are members which correspond to the action | operation part act | operated by the above-mentioned motor 2 in the elevator 5 for wheelchairs.

  Next, the motor control circuit 18 provided in the control BOX 19 for operating the wheelchair elevator 5 configured as described above includes a main power switch 43, an up switch 44, a down switch 45, and a plurality of electromagnetic relays. It is a relay sequence circuit mainly composed of X4, X5, X6, X7, X8, timer T2, capacitors C3, C4, and the motor 11 used as a drive source. Hereinafter, the connection relationship will be described based on the sequence operation of the motor control circuit 18, and the movement of the wheelchair elevator 5 will be described.

  First, when the main power switch 43 is turned on, the electromagnetic relay X6 is excited and the contact a of the electromagnetic relay X6 is turned on. As a result, when the raising switch 44 or the lowering switch 45 is turned on, the motor 11 is operated to rotate the shaft screw 15 and enter a standby state in which the table unit 7 can be raised and lowered.

Next, to raise the table section 7, when the raising switch 44 is turned on while the lowering switch 45 is off, the electromagnetic relay X4 is energized via the contact b of the electromagnetic relay X5, and the electromagnetic relay X4 is excited. Is done. When the electromagnetic relay X4 is excited, the contact a of the electromagnetic relay X4 is turned on and the contact b is turned off. When the contact b of the electromagnetic relay X4 is turned off, the lowering switch 45 and the electromagnetic relay X5 are electrically disconnected from the motor control circuit 18. When the contact a of the electromagnetic relay X4 is turned on, the electromagnetic relay X7 is excited, the contact a of the electromagnetic relay X7 is turned on, the brake B of the motor 11 is energized via the rectifier Rf, and the brake B is released. At the same time, the timer T2 is energized and the timer T2 starts counting. At the same time, the capacitors C3 and C4 connected in parallel between the contact a of the electromagnetic relay X4 and the double winding 11a of the motor 11 are energized, and the double winding 11a of the motor 11 is energized. The main winding 11b is energized. The capacitor C4 is energized through the b contacts of the electromagnetic relays X5 and X8. And the motor 11 is started in the direction which raises the table part 7 by supplying with electricity to the main winding 11b and the multiple winding 11a of the motor 11. FIG. When the motor 11 is activated, the shaft screw 15 of the drive unit 9 is rotated, and the table unit 7 is raised by the screwed relationship between the female screw cylinder 8 </ b> C provided in the sliding unit 8 and the shaft screw 15. At this time, the sliding portion 8 is supported by the pair of masts 6 d and 6 d of the base frame 6, so that the table portion 7 is raised without the sliding portion 8 being rotated together with the shaft screw 15. At this time, the capacitance of the capacitor C3 is a capacitance that causes the motor 11 to perform a rated operation. The capacitance of the capacitor C4 is optimally such that the starting torque of the motor 11 by the capacitors C3 and C4 is substantially equal to the rated torque in the operation of the motor 11 by the capacitor C3. Note that it is important to select the capacitance of the capacitor C4 so that the current value supplied to the motor 11 by the capacitors C3 and C4 does not exceed the allowable current value of the motor 11.
As a result, a current that is greater than or equal to the rated current value of the motor 11 and less than or equal to the allowable current value is energized from the capacitors C3 and C4 that are connected in parallel. Increased high torque operation.
Therefore, the torque shortage when starting the motor 11 in the direction in which the table portion 7 is raised can be resolved, and a large load formed by the load on the table portion 7 and the sliding portion 8 and the user and the wheelchair hinders the operation of the motor 11. Even when the table portion 7 acting as described above is raised, the motor 11 can be started smoothly and the table portion 7 can be raised smoothly.

The timer T2 is used as an on-delay timer, and when the count of the timer T2 is completed, the contact a of the timer T2 is turned on and the electromagnetic relay X8 is excited. Thereby, the b contact of the electromagnetic relay X8 connected between the a contact of the electromagnetic relay X4 and the capacitor C4 is turned off, and the power transmission to the capacitor C4 is stopped. Therefore, after the timer T2 has been counted, the motor 11 is shifted to the operation using only the capacitor C3 and raises the table unit 7.
At this time, the count time of the timer T2 is the time from when the motor 11 is started in the high torque operation of the motor 11 to when the motor 11 is operated by the capacitor C3 until reaching the rotation speed indicating a desired torque value ( In effect, it is more than a few seconds of commas). As a result, during the operation of the motor 11 using only the capacitor C3, the motor 11 is energized with a current not less than the rated current value of the motor 11 and not more than the allowable current value only during a time period when the torque is low, and the motor 11 is operated at a high torque. Therefore, the torque shortage at the time of starting of the motor 11 can be compensated. Further, when the operation state of the motor 11 is switched from the high torque operation state to the operation state using the capacitor C3, the motor 11 does not run out of torque.

  Further, in order to stop the ascent of the table unit 7, the hand is removed from the ascending switch 44, and the ascending switch 44 is turned off. When the raising switch 44 is turned off, power transmission to the electromagnetic relay X4 is stopped, and the contact “a” of the electromagnetic relay X4 is turned off. When the contact a of the electromagnetic relay X4 is turned off, power transmission to the motor 11 and the timer T2 is stopped, power transmission to the electromagnetic relay X7 is stopped, the contact a of the electromagnetic relay X7 is turned off, and the motor 11 The brake B is activated. Therefore, the motor 11 stops. When the motor 11 is stopped, the rotation of the shaft screw 15 provided in the drive unit 9 is stopped, and the rise of the table unit 7 is stopped. At the same time, the contact b of the electromagnetic relay X4 is turned on, and the motor control circuit 18 is returned to the state before the motor 11 is operated.

Next, in order to lower the table unit 7, the lowering switch 45 is turned on in the state where the uppering switch 44 is off. When the lowering switch 45 is turned on, the electromagnetic relay X5 is energized via the b contact of the electromagnetic relay X4, and the electromagnetic relay X5 is excited. When the electromagnetic relay X5 is excited, the contact a of the electromagnetic relay X5 is turned on and the contact b is turned off. When the contact b of the electromagnetic relay X5 is turned off, the ascending switch 44, the electromagnetic relay X4, and the capacitor C4 are electrically disconnected from the motor control circuit 18. When the contact a of the electromagnetic relay X5 is turned on, the electromagnetic relay X7 is excited, the contact a of the electromagnetic relay X7 is turned on, the brake B of the motor 11 is energized via the rectifier Rf, and the brake B is released. Is done. At the same time, the main winding 11b of the motor 11 is energized through the capacitor C3 and the multi-winding 11a is energized, and the motor 11 is activated in the direction of lowering the table portion 7 only by the capacitor C3 from the activation. . When the motor 11 is started, the shaft screw 15 of the drive unit 9 is rotated in the direction opposite to that when the table unit 7 is lifted, and the female screw cylinder 8 c provided in the sliding unit 8 and the shaft screw 15 are screwed together. Thus, the table unit 7 is lowered.
At this time, the motor 11 is operated only by the capacitor C3 from the time of start-up, and is not used with the sliding portion 8 and the table portion 7 by not performing the high torque operation of the motor 11 as when the table portion 7 is raised. The table 7 can be prevented from suddenly starting even when the table 7 is lowered in a direction in which the load of the person and the wheelchair is combined to promote the operation of the motor 11, and the table 7 can be started smoothly. Can be made.

  Next, in order to stop the lowering of the table unit 7, the hand is removed from the lowering switch 45, and the lowering switch 45 is turned off. When the lowering switch 45 is turned off, power transmission to the electromagnetic relay X5 is stopped, and the contact “a” of the electromagnetic relay X5 is turned off. When the contact a of the electromagnetic relay X5 is turned off, the power transmission to the motor 11 is stopped, the power transmission to the electromagnetic relay X7 is stopped, the contact a of the electromagnetic relay X7 is turned off, and the brake B of the motor 11 is stopped. Is activated. Therefore, the motor 11 stops. When the motor 11 is stopped, the rotation of the shaft screw 15 provided in the drive unit 9 is stopped, and the lowering of the table unit 7 is stopped. At the same time, the contact b of the electromagnetic relay X5 is turned on, and the motor control circuit 18 is returned to the state before the motor 11 is operated.

  Next, the capacitance of the motor 11 and the capacitances of the capacitors C3 and C4 in the first embodiment are the same as the capacitance of the motor 2 and the capacitances of the capacitors C1 and C2 exemplified in the description of the motor control circuit 1 described above. Then, the motor 11 according to the first embodiment moves as shown in FIGS. Therefore, the motor 11 operates in the same manner as the motor 2 described above and exhibits the same effect.

  That is, the motor control circuit 18 is a circuit in which a brake B release circuit built in the motor 11 is incorporated in the motor control circuit 1 described above.

In the first embodiment, the timer T2 is used as an on-delay timer, but a motor control circuit that performs the same control as the motor control circuit 18 by using it as an off-delay timer may be configured. Although not shown, in this case, the b contact of the timer T2 may be connected instead of the b contact of the electromagnetic relay X8. According to this, the electromagnetic relay X8 can be removed, and the connection space of the motor control circuit 18 can be reduced.
In the first embodiment, the b-contact of the electromagnetic relay X5 is connected between the raising switch 44 and the electromagnetic relay X4. However, the same control as that of the motor control circuit 18 is performed even if the wiring is changed as follows. A motor control circuit can be configured. Although not shown, the b contact of the electromagnetic relay X5 and the ascending switch 44 may be exchanged for connection, or the b contact of the electromagnetic relay X5 and the electromagnetic relay X4 may be exchanged for connection. Further, the raising switch 44 and the electromagnetic relay X4 may be switched and connected. Similarly, in the connection between the lower switch 45 and the b-contact of the electromagnetic relay X4 and the electromagnetic relay X5, and in the connection between the b-contact of the electromagnetic relays X5 and X8 and the capacitor C4, they may be replaced and connected.
Further, in the first embodiment, the table unit 7 is moved up and down in a desired direction by the ascending switch 44 or the descending switch 45. Although not shown, the selection for selecting the moving direction of the table unit 7 is performed. You may make it raise / lower the table part 7 to a desired direction by selecting the raising / lowering direction with a switch, and turning on the switch which operates the motor 11. FIG. Alternatively, each time the switch for operating the motor 11 is turned on, the ascending / descending direction of the table unit 7 is switched, and the table unit 7 may be moved up and down.
Depending on the capacity and type of power supply, the contact capacity and type of electromagnetic relays and timers, or whether the electromagnetic relays and timers are for direct current or alternating current, contacts such as transformers, rectifiers and other electromagnetic relays can be used. Thus, it is possible to configure a control circuit that performs the same function as the motor control circuit 18 of the first embodiment.

Therefore, when the motor control circuit 18 is provided in the wheelchair elevator 5 as in the first embodiment, when the motor 11 is started in the direction in which the table portion 7 is raised, the capacitor C3 is only used for the count time of the timer T2. , C4 is applied to the motor 11 with a current that is greater than or equal to the rated current value of the motor 11 and less than or equal to the allowable current value, and the motor 11 is operated at high torque. Then, after the timer T2 has been counted, the motor 11 can be operated only by the capacitor C3 to compensate for the start-up torque shortage of the motor 11. Therefore, by performing the high torque operation only for the count time of the timer T2, the power consumption of the motor 11 can be suppressed as compared with the case where the high torque operation is always performed while the table portion 7 is raised, and the motor 11 The generation of heat, vibration and sound can be suppressed. As a result, the motor 11 can be made difficult to break, and the anxiety and discomfort of the user with respect to the wheelchair elevator 5 due to vibrations and sounds emitted from the motor 11 of the wheelchair elevator 5 using the motor 11 as a drive source can be suppressed. Can do.
Further, by supplementing the starting torque of the motor 11, it is not necessary to select a motor having a large starting torque, and the rated torque is a large load that is a combination of the sliding portion 8 and the table portion 7 and the loads of the user and the wheelchair. It becomes possible to select the motor 11 that shows the torque value required for operation, so that the cost of the motor 11 can be reduced and the installation space for the motor 11 can be reduced.
Furthermore, when starting the motor 11 in the direction in which the table portion 7 is lowered, the motor 11 is operated only by the capacitor C3 from the time of starting, so that the motor 11 is started in the direction in which the table portion 7 is raised. The motor 11 can be started with a starting torque different from the starting torque. Therefore, when the required starting torque of the motor 11 varies depending on the ascending / descending direction of the table unit 7, the high torque operation of the motor 11 and the operation using only the capacitor C3 are selectively used according to the ascending / descending direction of the table unit 7. It is possible to prevent the part 7 from starting or from starting suddenly, and the table part 7 can be started smoothly.
Then, the count time of the timer T2 is set to be not less than the time from when the motor 11 is started to when the motor 11 is operated by the capacitor C3 until reaching the rotation speed indicating a desired torque value in the high torque operation of the motor 11. Yes. When the count time of the timer T2 is set in this way, the motor 11 surely has a torque equal to or greater than the desired torque value even when the operation state of the motor 11 is shifted from the high torque operation state to the operation state using only the capacitor C3. become. Therefore, the motor 11 does not run out of torque when the driving state is shifted, and the motor 11 can be prevented from being stopped or stopped. Therefore, the lifting / lowering operation of the table unit 7 can be maintained, and the user's wheelchair can be maintained. Anxiety and discomfort with the elevator 5 can be suppressed.

  Next, as a second embodiment, a motor control circuit 46 that performs the same control as the motor control circuit 18 provided in the wheelchair elevator 5 of the first embodiment and that can be provided in the wheelchair elevator 5 is described below. The control circuit 46 will be described below based on the drawings, assuming that the wheelchair elevator 5 of the first embodiment is provided. FIG. 10 is a relay sequence diagram showing the motor control circuit.

  The motor control circuit 46 includes a main power switch 47, an up switch 48, a down switch 49, a plurality of electromagnetic relays X9, X10, X11, X12, X13, a timer T3, capacitors C5 and C6, and a drive source. It is a relay sequence circuit mainly comprised from the said motor 11 used as.

  First, when the main power switch 47 is turned on, the electromagnetic relay X11 is excited and the contact a of the electromagnetic relay X11 is turned on. As a result, when the raising switch 48 or the lowering switch 49 is turned on, the motor 11 is operated to rotate the shaft screw 15 of the drive unit 9, and the table unit 7 enters a standby state in which the table unit 7 can be raised and lowered.

Next, to raise the table unit 7, when the raising switch 48 is turned on while the lowering switch 49 is off, the electromagnetic relay X9 is energized via the contact b of the electromagnetic relay X10. Excited. When the electromagnetic relay X9 is excited, the contact a of the electromagnetic relay X9 is turned on and the contact b is turned off. When the contact b of the electromagnetic relay X9 is turned off, the lowering switch 49 and the electromagnetic relay X10 are electrically disconnected from the motor control circuit 46. When the contact a of the electromagnetic relay X9 is turned on, the electromagnetic relay X13 is excited, the contact a of the electromagnetic relay X13 is turned on, the brake B of the motor 11 is energized via the rectifier Rf, and the brake B is released. At the same time, the timer T3 is energized and the timer T3 starts counting. At the same time, the capacitor C6 is energized from the a-contact of the electromagnetic relay X9 via the b-contact of the electromagnetic relay X12, energized to the compound winding 11a of the motor 11, and energized to the main winding 11b of the motor 11. And the motor 11 is started in the direction which raises the table part 7 by supplying with electricity to the main winding 11b and the multiple winding 11a of the motor 11. FIG. By starting the motor 11, the table unit 7 is raised. At this time, the capacitor C6 is optimally operated with the starting torque substantially equal to the rated torque when the motor 11 is operated by the capacitor C5 that causes the motor 11 to perform the rated operation. Note that it is important to select the capacitance of the capacitor C6 so that the current value supplied to the motor 11 by the capacitor C6 does not exceed the allowable current value of the motor 11.
As a result, a current that is greater than or equal to the rated current value of the motor 11 and less than or equal to the allowable current value is energized from the capacitor C6, and the motor 11 performs high-torque operation in which the starting torque is higher than the starting torque in the rated operation of the motor 11. Is done.
Therefore, the torque shortage when starting the motor 11 in the direction in which the table portion 7 is raised can be resolved, and a large load formed by the load on the table portion 7 and the sliding portion 8 and the user and the wheelchair hinders the operation of the motor 11. Even when the table portion 7 acting as described above is raised, the motor 11 can be started smoothly and the table portion 7 can be raised smoothly.

The timer T3 is used as an on-delay timer. When the count of the timer T3 is completed, the contact a of the timer T3 is turned on and the electromagnetic relay X12 is excited. As a result, the b-contact of the electromagnetic relay X12 connected between the a-contact of the electromagnetic relay X9 and the capacitor C6 is turned off, and power transmission to the capacitor C6 is stopped. At the same time, the contact a of the electromagnetic relay X12 is turned on, and the capacitor C5 is energized through the contact a to energize the compound winding 11a of the motor 11. Therefore, after the timer T3 count is completed, the motor 11 is shifted to the operation using only the capacitor C5 and raises the table unit 7.
At this time, the count time of the timer T3 is the time (from the time when the motor 11 is started to the time when the motor 11 is operated by the capacitor C5 until reaching the number of revolutions indicating a desired torque value in the high torque operation of the motor 11). In effect, it is more than a few seconds of commas). As a result, during the operation of the motor 11 using only the capacitor C5, the motor 11 is energized with a current not less than the rated current value of the motor 11 and not more than the allowable current value only during a time period when the torque is low, thereby causing the motor 11 to operate at high torque. And the torque shortage at the time of starting of the motor 11 can be compensated. Further, when the operation state of the motor 11 is switched from the high torque operation state to the operation state using the capacitor C3, the motor 11 does not run out of torque.

  Further, in order to stop the ascent of the table unit 7, the hand is removed from the ascending switch 48, and the ascending switch 48 is turned off. When the raising switch 48 is turned off, power transmission to the electromagnetic relay X9 is stopped, and the contact a of the electromagnetic relay X9 is turned off. When the contact a of the electromagnetic relay X9 is turned off, power transmission to the motor 11 and the timer T3 is stopped, and power transmission to the electromagnetic relay X13 is stopped, and the contact a of the electromagnetic relay X13 is turned off. The brake B is activated. Therefore, the motor 11 stops. When the motor 11 is stopped, the rotation of the shaft screw 15 provided in the driving unit 9 is stopped, and the ascent of the table unit 7 is stopped. At the same time, the contact b of the electromagnetic relay X9 is turned on, and the motor control circuit 46 is returned to the state before the motor 11 is operated.

Next, to lower the table portion 7, when the lowering switch 49 is turned on while the ascending switch 48 is off, the electromagnetic relay X10 is energized via the contact b of the electromagnetic relay X9. Excited. When the electromagnetic relay X10 is excited, the contact a of the electromagnetic relay X10 is turned on and the contact b is turned off. When the contact b of the electromagnetic relay X10 is turned off, the lift switch 48 and the electromagnetic relay X9 are electrically disconnected from the motor control circuit 46. When the contact a of the electromagnetic relay X10 is turned on, the electromagnetic relay X13 is excited, the contact a of the electromagnetic relay X13 is turned on, the brake B of the motor 11 is energized via the rectifier Rf, and the brake B is released. At the same time, the main winding 11b of the motor 11 is energized. At the same time, the electromagnetic relay X12 is energized, the contact a of the electromagnetic relay X12 is turned on, and the contact b is turned off. When the b-contact of the electromagnetic relay X12 is turned off, the capacitor C6 is electrically disconnected from the motor control circuit 46, and when the a-contact of the electromagnetic relay X12 is turned on, the main of the motor 11 is connected via the capacitor C5. The winding 11b is energized. By energizing the main winding 11b and the multiple winding 11a of the motor 11, the motor 11 is activated in the direction of lowering the table portion 7 only by the capacitor C5 from the time of activation. When the motor 11 is activated, the shaft screw 15 of the driving unit 9 is rotated in the direction opposite to that when the table unit 7 is raised, and the table unit 7 is lowered.
At this time, the motor 11 is operated only by the capacitor C5 from the time of startup, and is not used with the sliding portion 8 and the table portion 7 by not performing the high torque operation of the motor 11 as when the table portion 7 is raised. The table 7 can be prevented from suddenly starting even when the table 7 is lowered in a direction in which the load of the person and the wheelchair is combined to promote the operation of the motor 11, and the table 7 can be started smoothly. it can.

  Next, in order to stop the lowering of the table unit 7, the hand is removed from the lowering switch 49 and the lowering switch 49 is turned off. When the lowering switch 49 is turned off, power transmission to the electromagnetic relay X10 is stopped, and the contact a of the electromagnetic relay X10 is turned off. When the contact a of the electromagnetic relay X10 is turned off, the power transmission to the motor 11 is stopped, the power transmission to the electromagnetic relay X13 is stopped, the contact a of the electromagnetic relay X13 is turned off, and the brake B of the motor 11 is stopped. Is activated. Therefore, the motor 11 stops. When the motor 11 is stopped, the rotation of the shaft screw 15 of the drive unit 9 is stopped, and the lowering of the table unit 7 is stopped. At the same time, the contact b of the electromagnetic relay X10 is turned on, and the motor control circuit 46 is returned to the state before the motor 11 is operated.

  Therefore, the motor control circuit 46 can control the motor 11 in the same manner as the motor control circuit 18 of the first embodiment described above, and exhibits the same effect.

  Even if the timer T3 of the motor control circuit 46 is used as an off-delay timer, a motor control circuit having the same function as the motor control circuit 46 can be configured. Although not shown, in this case, the a contact and the b contact of the electromagnetic relay X12 connected between the a contact of the electromagnetic relay X9 and each of the capacitors C5 and C6 are switched and connected to transmit power to the electromagnetic relay X12. For this purpose, the contact a of the electromagnetic relay X10 may be removed.

Although not shown, capacitors C5 and C6 connected between the a contact of the electromagnetic relay X9 of the motor control circuit 46 and the double winding 11a of the motor 11 and the a contact and b contact of the electromagnetic relay X12. Is rearranged as follows, a motor control circuit having the same function as the motor control circuit 46 can be configured.
In this case, the capacitors C5 and C6 are connected in series between the contact a of the electromagnetic relay X9 and the double winding 11a of the motor 11, and from the contact a of the electromagnetic relay X9 to the capacitor C6, the capacitor C5, and the double winding 11a of the motor 11. Connect to. Then, the contact a of the electromagnetic relay X12 is connected between the capacitor C6 and the capacitor C5. Next, it branches from between the contact a of the electromagnetic relay X12 and the capacitor C6, and is connected to the compound winding 11a of the motor 11 through the contact b of the electromagnetic relay X12. The capacitance of the capacitor C6 in this case is a capacitance that causes the motor 11 to generate a torque required at the time of startup. The capacitance of the capacitor C5 is connected in series with the capacitor C6, so that the combined capacitance of the capacitors C5 and C6 is the same as the capacitance of the capacitor that causes the motor 11 to perform rated operation. It is. It is important to select the capacitance of the capacitor C6 that allows the motor 11 to pass a current that does not exceed the allowable current value of the motor 11.
That is, when the motor 11 is operated only by the capacitor C6 during high torque operation, and when the motor 11 is to be rated, the motor control circuit that enables the rated operation of the motor 11 by connecting the capacitors C5 and C6 in series. It is.

  The motor control circuit described above illustrates the connection relationship when the timer T3 is used as an on-delay timer. However, the motor control circuit that performs the same function is configured by using the timer T3 as an off-delay timer. You can also. Although not shown, in this case, the electromagnetic relay X10 for transmitting power to the electromagnetic relay X12 by switching the a contact and the b contact of the electromagnetic relay X12 from the connection state of the motor control circuit described above. It is sufficient to remove the contact a.

The relay sequence figure which shows a motor control circuit. The torque curve figure in the rated operation of a motor. The torque curve figure in the high torque driving | operation which raised the starting torque of the motor. The whole front view which shows the elevator for wheelchairs. Example 1 The whole left view which shows the elevator for wheelchairs. Example 1 Explanatory drawing which shows the structure state of the elevator for wheelchairs. Example 1 The principal part sectional view showing a drive part. Example 1 The principal part sectional drawing which shows a driven part. Example 1 The relay sequence figure which shows a motor control circuit. Example 1 The relay sequence figure which shows a motor control circuit. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor control circuit 2 Motor 11 Motor 18 Motor control circuit 46 Motor control circuit C1 Capacitor C2 Capacitor C3 Capacitor C4 Capacitor C5 Capacitor C6 Capacitor T1 Timer T2 Timer T3 Timer

Claims (2)

  In the motor control circuit of a device equipped with a capacitor induction motor used as a drive source, when starting the motor in the forward rotation direction, the capacitance of the capacitor is set to the motor only during the time counted by the timer from the start of the motor. The motor's starting torque is higher than the starting torque in the rated operation of the motor by energizing the motor with a current that is higher than the rated current value of the motor and lower than the allowable current value. When the motor is operated and the count is completed, the motor is operated as the capacitance of the capacitor that causes the motor to operate at the rated capacitance. When starting the motor in the reverse rotation direction, the capacitor is started from the start of the motor. Capacitor capacitance that allows the motor to operate at rated capacitance Motor control circuit for the motor is operated, and wherein the changing the motor starting torque by the rotation direction of the motor as a.   The timer count time is set to the desired value when the motor is operated as the capacitance of the capacitor that causes the motor to operate at the rated capacitance from the start of the motor in high torque operation with increased motor start torque. 2. The motor control circuit according to claim 1, wherein the motor control circuit is set to be equal to or longer than a time required to reach a rotational speed indicating a torque value.

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