Control equipment for motor-driven lifting devices

Abstract

By using a microcomputer to control the on / off of a contactless switch device, a control board is made compatible with a three-phase AC motor and a single-phase AC motor and is reduced in size. When a three-phase AC motor (10) is to be used, lead wires (11-1 to 11-3) of the three-phase AC motor are connected to output terminals (Ut, Vt, Wt) of a control board (20). When a single-phase AC motor (50) is to be used, two supply terminals (Rt, St) of the control board are electrically connected together through a first connecting member (61), and one end of the first connecting member is defined as a single-phase AC power supply terminal (SP1). A second connecting member (62) is connected to the supply terminal (Tt), and one end of the second connecting member is defined as a single-phase AC power supply terminal (SP2). A main winding (51) of the single-phase AC motor (50) is connected to the output terminals (Ut, Wt), and an auxiliary winding (52) is connected to the output terminal (Vt) and the second connecting member (62).

Description

Technical Field

[0001] The present invention relates to a control apparatus for a motor-driven lifting device such as a chain block, a rope crane, etc., for lifting and lowering (hereinafter sometimes described as "lifting") a heavy object (hereinafter referred to as "load"). Background Art

[0002] Conventional motor-driven lifts are generally divided into two types: those that use a three-phase AC motor as the motor for lifting and lowering (raising and lowering) a load, and those that use a single-phase AC motor as such a motor. These two different types of motor-driven lifts utilize control boards with different configurations to form their control devices. Consequently, conventional motor-driven lift control devices utilize control boards with different configurations depending on whether the load-lifting motor is a three-phase motor or a single-phase motor. Consequently, control boards with different configurations must be prepared depending on whether the motor is a three-phase motor or a single-phase motor, resulting in increased costs. Furthermore, conventional motor-driven lift control devices encounter the problem of requiring control power supply circuits with different configurations depending on the power supply voltage.

[0003] Under such circumstances, Patent Document 1 discloses an apparatus (air conditioning apparatus) using a single-phase AC motor or a three-phase AC motor as a motor, the apparatus using a phase-controllable control board compatible with single-phase and three-phase AC motors, thereby allowing the single-phase or three-phase AC motor to be connected to the control board. The disclosed apparatus has a configuration in which, as shown in FIG. Figure 4 As shown in the figure, a three-phase solid-state relay 102, a three-phase power input connector 103, a single-phase power input connector 104, a three-phase power output connector 105, a single-phase power output connector 106 and an IC circuit 107 are arranged on the control board 101, and these components are connected to each other through pattern wiring 108.

[0004] References:

[0005] Patent Literature:

[0006] Patent Document 1: Japanese Patent Application Publication No. 08-317690 Summary of the Invention

[0007] Technical issues:

[0008] The device disclosed in Patent Document 1 uses only one of the three-phase current paths of the three-phase solid-state relay 102 to drive a single-phase AC motor, rather than being configured to use all three current paths of the three-phase solid-state relay for forward rotation (different from its current path for reverse rotation) to drive the single-phase AC motor. Therefore, when a single-phase AC motor is used, a portion of the contactless switching device of the three-phase solid-state relay is undesirably subjected to a heavy load. In addition, the device disclosed in Patent Document 1 is not a technology that takes into account the forward and reverse rotation of the AC motor and, therefore, cannot be used in devices that frequently perform load lifting operations, such as motor-driven lifting devices (i.e., devices that frequently perform forward and reverse operations of the AC motor to raise and lower the load).

[0009] The present invention has been developed in light of the above-described circumstances. An object of the present invention is to provide a motor-driven lifting device control device that is compatible with both three-phase and single-phase AC motors without requiring modification to the control board itself. Specifically, when a three-phase AC motor is used as a load lifting motor, the three-phase AC motor can be connected to the output side of the control board simply by connecting the former to the latter, and when a single-phase AC motor is used as a load lifting motor, the single-phase AC motor can be connected to the output side of the control board simply by using a simple connecting member for the control board.

[0010] Solution to the problem

[0011] In order to solve the above-mentioned problem, the present invention provides a motor-driven lifting device control device, which includes a control board (20) on which contactless switch devices (21-1 to 21-5) and a microcomputer (23) for implementing on-off control of the contactless switch devices are installed. The control board (20) has three supply terminals (Rt, St, Tt) on the input side, and three output terminals (Ut, Vt, Wt) corresponding to the supply terminals (Rt, St, Tt) on the output side. When a three-phase AC motor (10) is to be used, a three-phase AC power supply (100) is connected to the supply terminals (Rt, St, Tt), and the three-phase AC motor (10) is connected to the output terminals (Ut, Vt, Wt). The AC current to be supplied to the three-phase AC motor (10) is controlled by controlling the contactless switch devices (21-1 to 21-5) using the microcomputer (23). When the single-phase AC motor (50) is to be used, two of the three supply terminals (Rt, St, Tt) of the control board (20) are electrically connected together via a first connecting member (61) to form a single-phase AC power supply terminal (SP1) connected to one terminal of a single-phase AC power supply (200). A second connecting member (62) is connected to the remaining supply terminal (Tt) to form a single-phase AC power supply terminal (SP2) connected to the other terminal of the single-phase AC power supply. The single-phase AC power supply (200) is connected between the single-phase AC power supply terminals (SP1, SP2). A main winding current path is formed such that the AC current output from one of the output terminals (Ut, Vt) corresponding to the electrically connected supply terminals (Rt, St) and the output terminal (Wt) corresponding to the remaining supply terminal (Tt) is transmitted through the main winding (51) of the single-phase AC motor (50). An auxiliary winding current path is formed so that an AC current output from another output terminal (Vt) and a second connecting member (62) is transmitted through an auxiliary winding (52) of a single-phase AC motor (50). The AC current to be supplied to the main winding (51) and the auxiliary winding (52) is controlled by controlling contactless switching devices (21-1 to 21-5) using a microcomputer (23).

[0012] In addition, the present invention has the following features. In the above-mentioned motor-driven lifting device control device, when a three-phase AC motor (10) is used, the forward and reverse rotations of the three-phase AC motor (10) are implemented by switching two phases of the three-phase AC current by controlling the contactless switching devices (21-1 to 21-5) on and off, and when a single-phase AC motor (50) is used, the switching between the forward and reverse rotations of the single-phase AC motor (50) is implemented in the following manner, that is, the switching is implemented so that the phase of the main current flowing through the main winding (51) of the single-phase AC motor (50) is reversed by 180 degrees when the rotation is switched between the forward and reverse directions by controlling the contactless switching devices (21-1 to 21-5) on and off. It should be noted that the phase of the auxiliary current flowing through the auxiliary winding (52) does not change even when the rotation is switched between the forward and reverse directions.

[0013] In addition, the present invention has the following features. In the above-mentioned motor-driven lifting device control device, the main winding current path includes the main winding (51), the input side of the full-wave rectifier circuit (26), and the action coil (63c) of the motor start relay (63) connected in series, and also includes the excitation coil (27a) of the electromagnetic brake (27) connected to the output side of the full-wave rectifier circuit (26). The auxiliary winding current path includes the auxiliary winding (52), the phase-advancing capacitor (65), and the contacts (63a, 63b) of the motor start relay (63). The auxiliary winding, the phase-advancing capacitor, and the contacts of the motor start relay are connected in series so that the auxiliary winding current path can be controlled to be on and off by the motor start relay (63).

[0014] In addition, the present invention has the following features. In the above-mentioned motor-driven lifting device control device, the main winding current path includes a main winding (51) and an input side of a full-wave rectifier circuit (26) connected in series, and also includes an excitation coil (27a) of an electromagnetic brake (27) connected to the output side of the full-wave rectifier circuit (26). The auxiliary winding current path includes an auxiliary winding (52) and a phase-advancing capacitor (65), and the auxiliary winding and the phase-advancing capacitor are connected in series so that, according to the magnitude of the current flowing through the main winding current path of the single-phase AC motor, the current flowing through the auxiliary winding current path can be cut off by controlling the contactless switch device (21-2) by using a microcomputer (23) to turn on and off.

[0015] The present invention also has the following features: In the above-mentioned motor-driven lifting device control device, two of the pattern wirings (22-1, 22-2, 22-3) connected to the supply terminals (Rt, St, Tt) are provided with current sensors (28S, 28T), each having a different measurement range.

[0016] In addition, the present invention has the following features: In the above-mentioned motor-driven lifting device control device, a pattern wiring (22-3) for supplying current to a main winding (51) of a single-phase AC motor (50) is provided with a current sensor (28T) having a large measurement range, and a pattern wiring (22-2) for supplying current to an auxiliary winding (52) of the single-phase AC motor (50) is provided with a current sensor (28S) having a small measurement range.

[0017] In addition, the present invention has the following features. The above-mentioned motor-driven lifting device control device is provided with a control power supply circuit (24), and the control power supply circuit includes a single-phase voltage doubling circuit (40), and the single-phase voltage doubling circuit is supplied with the phase-to-phase voltage between two phases of the three-phase AC power supply (100) connected to the supply terminals (Rt, St, Tt) or the single-phase voltage of the single-phase AC power supply (200) connected to the single-phase AC power supply terminals (SP1, SP2) as input. The single-phase voltage doubling circuit (40) is configured so that: when a single-phase voltage is input thereto, the single-phase voltage doubling circuit (40) doubles the input voltage, thereby making the input voltage equal to the phase-to-phase voltage between two phases of the three-phase AC power supply, and thus making the control circuit block (25) including the microcomputer (23) and the control power supply circuit (24) compatible with three-phase and single-phase applications.

[0018] Advantages of the invention:

[0019] According to the present invention, when a three-phase AC motor (10) is used as a load lifting motor, the lead wires (11-1 to 11-3) of each phase winding of the three-phase AC motor (10) are simply connected to the output terminals (Ut, Vt, Wt) of the control board (20). When a single-phase AC motor (50) is used, the lead wires (66-1) of the main winding (51) of the single-phase AC motor and the lead wires (66-3) of the auxiliary winding (52) of the single-phase AC motor are simply connected to the two output terminals (Ut, Vt) of the control board (20). Therefore, the control board (20) as the main component of the motor-driven lifting device control device capable of using the three-phase AC motor (10) and the single-phase AC motor (50) can be provided at low cost, and the motor-driven lifting device control device itself can also be provided at low cost because the motor-driven lifting device control device is constructed by using the low-cost control board (60) as the main component.

[0020] Furthermore, a motor-driven lifting device control apparatus using a single-phase AC motor (50) can be constructed simply by adding a first connecting member (61) and a second connecting member (62) to a control board (20). Therefore, a motor-driven lifting device control apparatus using a single-phase AC motor (50) can be provided at low cost.

[0021] Furthermore, when a three-phase AC motor is used, switching between forward and reverse rotation is performed by switching the two phases by controlling the on / off control of contactless switching devices (21-1 to 21-5) provided between supply terminals (Rt, St, Tt) on the input side of the control board (20) and output terminals (Ut, Vt, Wt) on the output side of the control board (20), and when a single-phase AC motor is used, switching between forward and reverse rotation is performed by switching so that the phase of the current flowing through the main winding is reversed by 180 degrees (phase shifted by 180 degrees) by controlling the on / off control of the contactless switching devices (21-1 to 21-5). Therefore, forward and reverse rotation switching control can be performed simply by controlling the on / off control of the contactless switching devices.

[0022] In addition, when a three-phase AC motor (10) or a single-phase AC motor (50) is used as a load lifting motor, the current path including the contactless switching devices (21-1 to 21-5) is used approximately equally; therefore, the service life of the contactless switching devices, etc. can be extended.

[0023] In addition, when the current flowing through the main winding (51) reaches a predetermined value or after a predetermined time has passed (for example, when the rotation becomes stable) after the load raising or lowering operation of the single-phase AC motor (50) is started, the contactless switching device (21-2) is turned off to stop the current flowing through the auxiliary winding (52) thereafter, thereby eliminating the electric power consumed by the auxiliary winding (52) and the like and thus achieving energy saving. In addition, since energy saving can be achieved by turning off the contactless switching device (21-2) without requiring a motor starting relay, the cost can be reduced by an amount corresponding to the cost of the motor starting relay that would otherwise be required.

[0024] In addition, a control board (20) as a main component of a motor-driven lifting device control device capable of using a three-phase AC motor (10) and a single-phase AC motor (50) has a current sensor (28T) with a large measuring range provided on a pattern wiring (22-3) for supplying current to a main winding (51) of the single-phase AC motor (50), and also has a current sensor (28S) with a small measuring range provided on a pattern wiring (22-2) for supplying current to an auxiliary winding (52) of the single-phase AC motor (50), so that when the three-phase AC motor is controlled ( Figure 8 ), electric power is calculated mainly based on the measurement results made by a current sensor (28S) with a small measurement range suitable for measuring the current of a three-phase AC motor, and when a single-phase AC motor is to be controlled ( Figure 9 ), electric power is calculated mainly based on the measurement results made by a current sensor (28T) having a large measurement range and suitable for measuring the current of a single-phase AC motor. Therefore, the accuracy of detecting the motor load based on the electric power calculation result can be improved, and the detection circuit for detecting current and electric power can be made compatible with a three-phase AC motor with a small rated current (for example, voltage: 460V) and a single-phase AC motor with a large rated current (for example, voltage: 100V).

[0025] Furthermore, according to the present invention, the control power supply circuit (24) is provided with a single-phase voltage doubling circuit (40), which doubles the single-phase voltage, thereby enabling the control circuit block (25) including the microcomputer (23) and the control power supply circuit (24) to be compatible with a plurality of single-phase power supplies having mutually different single-phase voltages, and thus the number of its manufacturing models can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a diagram showing an example of a configuration in which a three-phase AC motor is connected to an output portion of a motor-driven lifting device control apparatus according to the present invention.

[0027] Figure 2 1 is a diagram showing an example of a configuration in which a single-phase AC motor is connected to an output portion of a motor-driven lifting device control apparatus according to the present invention.

[0028] Figure 3 1 is a diagram showing an example of a configuration in which a single-phase AC motor is connected to an output portion of a motor-driven lifting device control apparatus according to the present invention.

[0029] Figure 4 1 is a schematic diagram showing a circuit configuration of the air conditioning apparatus disclosed in Patent Document 1 described above.

[0030] Figure 5 is a simplified diagram illustrating a technique for making a control circuit block compatible with three-phase and single-phase applications by using a single-phase voltage doubler.

[0031] Figure 6 2 is a simplified diagram showing an example of a configuration of a voltage doubler circuit.

[0032] Figure 7 FIG. 1 is a simplified diagram showing a control flow of a control apparatus for a motor-driven lifting device according to the present invention.

[0033] Figure 8 1 is a diagram showing an example of a configuration in which a three-phase AC motor is connected to an output portion of a motor-driven lifting device control apparatus according to the present invention.

[0034] Figure 9 1 is a diagram showing an example of a configuration in which a single-phase AC motor is connected to an output portion of a motor-driven lifting device control apparatus according to the present invention. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present invention will be described in detail. Figure 1 This is a simplified diagram showing an example of the basic overall configuration of a motor-driven lift control device according to the present invention. Here, an example will be described in which a three-phase AC motor (in this example, a three-phase induction motor) 10 is used as the motor of a motor-driven lift for lifting and lowering a load. The motor-driven lift control device includes a control board 20, on which are mounted five contactless switch devices 21-1 to 21-5, which constitute a three-phase contactless device (solid-state relay SSR) 21. Contactless switch devices 21-1 to 21-3 rotate the three-phase AC motor 10 in the forward direction (i.e., the direction for lifting (raising) the load), while contactless switch devices 21-4, 21-2, and 21-5 (e.g., triacs, which are semiconductor switches) rotate the three-phase AC motor 10 in the reverse direction (i.e., the direction for lowering (lowering) the load).

[0036] The control board 20 is also provided with three supply terminals Rt, St, and Tt on its input side. These supply terminals are used to supply three-phase AC current from the three-phase AC power supply 100. The control board is also provided with three output terminals Ut, Vt, and Wt. These output terminals are used to output the three-phase AC current controlled by the control board 20 to the three-phase AC motor 10. A contactless switch device 21-1 is provided between the supply terminal Rt and the output terminal Ut via a pattern wiring 22-1. A contactless switch device 21-2 is provided between the supply terminal St and the output terminal Vt via a pattern wiring 22-2. A contactless switch device 21-3 is provided between the supply terminal Tt and the output terminal Wt via a pattern wiring 22-3. The contactless switch devices 21-1, 21-2, and 21-3 respectively form three current paths for supplying the three-phase AC current to the three-phase AC motor 10, generating a rotating magnetic field that rotates the rotor (not shown) of the three-phase AC motor 10 in the forward direction.

[0037] The contactless switch device 21-4 is provided between the supply terminal Rt and the output terminal Wt via a pattern wiring 22-4, and the contactless switch device 21-5 is provided between the supply terminal Tt and the output terminal Ut via a pattern wiring 22-5. The combination of the contactless switch device 21-4 and the pattern wiring 22-4, the combination of the contactless switch device 21-5 and the pattern wiring 22-5, and the combination of the contactless switch device 21-2 and the pattern wiring 22-2 respectively form the following three current paths for supplying the three-phase AC current to the three-phase AC motor 10 to generate a rotating magnetic field for rotating the rotor of the three-phase AC motor 10 in the reverse direction.

[0038] Furthermore, a current sensor (Hall IC) 28R is provided between the supply terminal Rt and the contactless switch device 21-1 to detect the R-phase current supplied to the windings of the three-phase AC motor 10 via the pattern wiring 22-1. A current sensor (Hall IC) 28T is provided between the supply terminal Tt and the contactless switch device 21-3 to detect the T-phase current supplied to the windings of the three-phase AC motor 10 via the pattern wiring 22-3. Furthermore, as shown in the figure, the current sensor 28R is provided at a position capable of also detecting the current passing through the contactless switch device 21-4, and the current sensor 28T is provided at a position capable of also detecting the current flowing through the contactless switch device 21-5.

[0039] Furthermore, a control circuit block 25 is mounted on the control board 20. The control circuit block includes a microcomputer 23 and a control power supply circuit 24. The AC voltage (phase-to-phase voltage) input between the two phases of the supply terminal St and the supply terminal Tt is supplied as an input to the control power supply circuit 24 via pattern wirings 22-6 and 22-7. Furthermore, the detection currents IR and IT detected by current sensors 28R and 28T are input to the microcomputer 23. Lead wires 11-1 and 11-2 connected to the windings of two of the three phases of the stator of the three-phase AC motor 10 are connected to the output terminals Ut and Vt of the control board 20, respectively. Lead wire 11-3 connected to the windings of the remaining phases of the stator of the three-phase AC motor 10 is connected to the output terminal Wt of the control board 20 via a full-wave rectifier circuit 26.

[0040] Reference numeral 27 denotes an electromagnetic brake. The electromagnetic brake 27 has an excitation coil 27a connected to the output of the full-wave rectifier circuit 26. The AC current from the output terminal Wt of the control board 20 is converted into DC current by the full-wave rectifier circuit 26 and supplied to the excitation coil 27a as brake current. Consequently, the electromagnetic brake 27 is released, and the rotor of the three-phase AC motor 10 becomes unconstrained. Typically, a three-phase AC motor 10 includes the full-wave rectifier circuit 26, the electromagnetic brake 27, and lead wires 11-1 to 11-3, all of which are combined into a single product after mechanical and electrical adjustments are made to ensure that each component performs its function. When the three-phase AC motor 10, prepared as a single product, is used as a load lifting motor, the motor-driven lifting device control device can be simply constructed by mechanically assembling the three-phase AC motor into the device and then connecting the lead wires 11-1, 11-2, and 11-3 of the three-phase AC motor 10 to the output terminals Ut, Vt, and Wt of the control board 20, respectively.

[0041] Reference numeral 30 denotes the operating unit of the motor-driven lifting device control device. Operating unit 30 includes an emergency button switch 31, a lift button switch 32, and a lower button switch 33. When, for example, lift button switch 32 of operating unit 30 is pressed while the three-phase AC power supply (commercial three-phase power supply) 100 is connected and power is supplied via supply terminals Rt, St, and Tt of control board 20, a lift signal is output to microcomputer 23. Microcomputer 23 then controls the contactless switches 21-1, 21-2, and 21-3 of three-phase contactless device (solid-state relay SSR) 21 to conduct, causing three-phase current to be supplied to each stator winding of three-phase AC motor 10. This three-phase current generates a rotating magnetic field that rotates the rotor of three-phase AC motor 10 in the load lifting direction. Simultaneously, a brake current is supplied to the excitation coil 27a of electromagnetic brake 27 via full-wave rectifier circuit 26, releasing electromagnetic brake 27. Thereby, the rotor of the three-phase AC motor 10 rotates in the load-lifting direction to lift (increase) the load.

[0042] When the load reaches the predetermined position, the pressing of the lift button switch 32 is stopped. Consequently, the lift signal to the microcomputer 23 is stopped, and through processing by the microcomputer 23, the contactless switching devices 21-1, 21-2, and 21-3 are opened (disconnected). Consequently, the current to the three-phase AC motor 10 is stopped. Simultaneously, the brake current to the excitation coil 27a of the electromagnetic brake 27 is stopped, and the electromagnetic brake 27 mechanically operates to stop (restrain) the rotor of the three-phase AC motor 10.

[0043] When the load reduction push button switch 33 of the operating unit 30 is pressed, a load reduction signal is output to the microcomputer 23, and the contactless switching devices 21-4, 21-2, and 21-5 of the three-phase contactless device 21 are controlled to be turned on through processing by the microcomputer 23, so that a three-phase current is supplied to the three-phase AC motor 10. This three-phase current generates a rotating magnetic field that rotates the rotor of the three-phase AC motor 10 in the load reduction direction. At the same time, a brake current is supplied to the excitation coil 27a of the electromagnetic brake 27 through the full-wave rectifier circuit 26, thereby releasing the electromagnetic brake 27. As a result, the rotor of the three-phase AC motor 10 rotates to reduce (lower) the load.

[0044] When the load reaches the predetermined position, the pressure on the lowering button switch 33 is stopped. Consequently, the lowering signal to the microcomputer 23 is stopped, and through processing by the microcomputer 23, the contactless switching devices 21-4, 21-2, and 21-5 are opened. Consequently, the current to the three-phase AC motor 10 is stopped. Simultaneously, the brake current to the excitation coil 27a of the electromagnetic brake 27 is stopped, and the electromagnetic brake 27 mechanically operates to stop (restrain) the rotor of the three-phase AC motor 10.

[0045] As described above, the control board 20 has a set of supply terminals Rt, St, and Tt and a set of output terminals Ut, Vt, and Wt, the set of supply terminals and the set of output terminals being provided at a pair of opposite side edges (input side and output side) of the control board, respectively, and two current paths are provided between the set of supply terminals Rt, St, and Tt and the set of output terminals Ut, Vt, and Wt: a boost current path for supplying a three-phase AC current for rotating the rotor of the three-phase AC motor 10 in a load-boosting direction (the boost current path includes the pattern wiring 22-1 and the contactless a combination of a switching device 21-1, a combination of a pattern wiring 22-2 and a contactless switching device 21-2, and a combination of a pattern wiring 22-3 and a contactless switching device 21-3); and a reduced current path for supplying a three-phase AC current for rotating the rotor of the three-phase AC motor 10 in a load reduction direction opposite to the load increase direction (the reduced current path includes a combination of a pattern wiring 22-4 and a contactless switching device 21-4, a combination of a pattern wiring 22-2 and a contactless switching device 21-2, and a combination of a pattern wiring 22-5 and a contactless switching device 21-5).

[0046] In the above description, an example has been described in which the lead wires 11-1, 11-2, and 11-3 from the respective phase windings of the three-phase AC motor 10 are connected to the output terminals Ut, Vt, and Wt of the control board 20 of the motor-driven lift device control device according to the present invention, and the rotor of the three-phase AC motor 10 is operated and controlled in the load-lifting direction or the load-lowering direction. The motor-driven lift device control device according to the present invention is configured so that a motor-driven lift device and a control device therefor can be constructed simply by connecting additional simple external wiring to a single-phase AC power supply and further connecting the lead wires from the single-phase AC motor to the output terminals Ut, Vt, and Wt on the output side of the control board 20 without modifying the control board 20 itself. The following is a detailed description of an example of a motor-driven lift device control device using a single-phase AC motor as the load-lifting motor.

[0047] Figure 2 1 is a diagram showing an example of a configuration structure of a motor-driven lifting device control device using a single-phase AC motor 50 (a single-phase induction motor in this example) as a load lifting motor. Figure 2 In the control panel 20, the control panel 20 itself has Figure 1The control board 20 of the motor-driven lift control device shown in FIG. Specifically, the control board 20 has three supply terminals, Rt, St, and Tt, on its input side, and three output terminals, Ut, Vt, and Wt, on its output side. A non-contact switch device 21-1 is provided between the supply terminal Rt and the output terminal Ut via a pattern wiring 22-1. A non-contact switch device 21-2 is provided between the supply terminal St and the output terminal Vt via a pattern wiring 22-2. A non-contact switch device 21-3 is provided between the supply terminal Tt and the output terminal Wt via a pattern wiring 22-3. Furthermore, a non-contact switch device 21-4 is provided between the supply terminal Rt and the output terminal Wt via a pattern wiring 22-4, and a non-contact switch device 21-5 is provided between the supply terminal Tt and the output terminal Ut via a pattern wiring 22-5.

[0048] exist Figure 2 In the example, two crossover wires (external wiring) 61 and 62 are added to the input side of the control board 20, where supply terminals Rt, St, and Tt are provided. First crossover wire 61 connects to supply terminal Rt and supply terminal St to electrically connect them (short-circuit them), and one end of crossover wire 61 is defined as single-phase AC power supply terminal SP1, which is connected to one terminal of single-phase AC power supply 200 (commercial single-phase power supply). Second crossover wire 62 connects to supply terminal Tt and contact 63b of motor starter relay 63 to electrically connect them (short-circuit them), and one end of crossover wire 62 is defined as single-phase supply terminal SP2, which is connected to the other terminal of single-phase AC power supply (commercial single-phase power supply) 200. Furthermore, contact 63a of motor starter relay 63 is connected to phase advance capacitor 65 via second crossover wire 62.

[0049] The single-phase AC motor 50 is provided on the output side of the control board 20, which is provided with output terminals Ut, Vt, and Wt. The single-phase AC motor 50 is configured to include a main winding 51 and an auxiliary winding 52. One end U of the main winding 51 is connected to the output terminal Ut of the control board 20 via a lead wire 66-1, and the other end V of the main winding 51 is connected to the midpoint of the full-wave rectifier circuit 26 via a lead wire 66-2. The output end of the full-wave rectifier circuit 26 is connected to one end of the excitation coil 27a of the electromagnetic brake 27. The other end of the excitation coil 27a is connected to the output terminal Wt of the control board 20 via the full-wave rectifier circuit 26 and the operating coil 63c of the motor starter relay 63. One end Y of the auxiliary winding 52 is connected to the output terminal Vt of the control board 20 via a lead wire 66-3, and the other end X of the auxiliary winding 52 is connected to one end of the phase-advancing capacitor 65 via a lead wire 66-4. As described above, the other end of the phase advancing capacitor 65 is connected to the supply terminal Tt via the crossover line 62 , the contacts 63 a and 63 b of the motor starting relay 63 , and the crossover line 62 .

[0050] Figure 2 The motor-driven lifting device control device shown in FIG further includes an operation unit 30 including an emergency button switch 31, a lifting button switch 32, a lowering button switch 33, etc., and also includes a control circuit block 25 including a microcomputer 23 and a control power supply circuit 24, which is in the same Figure 1 When the three-phase AC power supply 200 is connected between the single-phase AC power supply terminals SP1 and SP2 and is turned on, for example, the lift button switch 32 of the operating unit 30 is pressed, a lift signal is output to the microcomputer 23, and the non-contact switch devices 21-1, 21-2, and 21-3 are controlled to be turned on by processing of the microcomputer 23.

[0051] Therefore, the main current flows from the output terminal Ut of the control board 20 through the lead wire 66-1 and from one end U of the main winding 51 of the single-phase AC motor 50 through the other end V of the main winding 51, and further flows to the single-phase supply terminal SP2 and the action coil 63c of the motor start relay 63 via the full-wave rectifier circuit 26 connected to the excitation coil 27a of the electromagnetic brake 27 and further to the output terminal Wt of the control board 20, the pattern wiring 22-3, the contactless switch device 21-3 and the supply terminal Tt. Here, the current path including the main winding 51, the full-wave rectifier circuit 26, etc. will be referred to as the "main winding current path". The main winding 51, the full-wave rectifier circuit 26 and the action coil 63c of the motor start relay 63 only need to be connected in series, and therefore can also be connected in the same manner as described above. Figure 2 For example, the excitation coil 27 a of the electromagnetic brake 27 may be connected between the output terminal Ut and one end U of the main winding 51 .

[0052] In addition, the auxiliary current flows from the output terminal Vt of the control board 20 to the auxiliary winding 52 of the single-phase AC motor 50 through the lead wire 66-3, so as to flow from one end Y of the auxiliary winding 52 to the other end X. In addition, the auxiliary current flows to the single-phase supply terminal SP2 via the lead wire 66-4 and the phase-advancing capacitor 65, as well as via the crossover wire 62, the contacts 63a and 63b of the motor start relay 63, and the crossover wire 62. Here, the current path including the auxiliary winding 52, the phase-advancing capacitor 65, the contacts (36a, 36b) of the motor start relay 63, etc. will be referred to as the "auxiliary winding current path". The auxiliary winding 52, the phase-advancing capacitor 65, and the contacts (36a, 36b) of the motor start relay 63 only need to be connected in series, and therefore can also be connected in the same manner as described above. Figure 2 For example, a phase-advancing capacitor 65 for startup may be provided between the output terminal Vt and one end Y of the auxiliary winding 52 .

[0053] As described above, the main AC current flows from the control board 20 through the main winding current path to the main winding 51 of the single-phase AC motor 50, while the auxiliary AC current flows through the auxiliary winding current path via the phase-advancing capacitor 65 to the auxiliary winding 52. This creates a phase difference between the main and auxiliary AC currents, generating a rotating magnetic field in the stator of the single-phase AC motor 50. This rotating magnetic field causes the rotor 53 of the single-phase AC motor 50 to rotate in the forward direction, which is used to lift the load. Consequently, the rotor 53 rotates in the same direction as the rotating magnetic field. Consequently, the rotor 53 of the single-phase AC motor 50 begins to rotate in the direction specified by the microcomputer 23, thereby lifting the load. It should be noted that when the main AC current flowing through the main winding 51 becomes less than a predetermined current value, the motor start relay 63 is activated to open contacts 63a and 63b, thereby shutting off the auxiliary current flowing through the auxiliary winding current path. This eliminates the auxiliary current flowing through the auxiliary winding current path after the single-phase AC motor has started and reached a predetermined rotation speed, thereby achieving energy savings.

[0054] On the other hand, when the lowering button switch 33 of the operating unit 30 is pressed, the rotation direction of the rotating magnetic field generated in the stator of the single-phase AC motor 50 needs to be reversed relative to the load-raising direction described above. That is, the electrical connection between the output terminals Ut and Wt and the input terminals Rt and Tt needs to be switched so that the electrical connection is reversed between the case where the load is raised and the case where the load is lowered, so that the phase of the main current flowing through the main winding 51 of the single-phase AC motor 50 is reversed by 180 degrees (the phase is shifted by 180 degrees), while the phase of the auxiliary winding current flowing through the auxiliary winding 52 of the single-phase AC motor 50 remains the same (i.e., there is no phase change) regardless of whether the operation is raising or lowering. Here, for load increase, contactless switching devices 21-1, 21-3, and 21-2 are controlled to be on, and for load reduction, contactless switching devices 21-4, 21-5, and 21-2 are controlled to be on. This allows the phase of the main current flowing through the main winding 51 to reverse 180 degrees when switching from load increase to load reduction. Specifically, the switching is implemented as follows. When the lift button switch 32 is pressed, the microcomputer 23 processes the contactless switching devices 21-1 and 21-3 and 21-2, controlling the single-phase AC power supply terminal SP1 to be electrically connected to one end U of the main winding 51 via the contactless switching device 21-1, and the single-phase AC power supply terminal SP2 to be electrically connected to the other end V of the main winding 51 via the contactless switching device 21-3. When the lowering button switch 33 is pressed, the microcomputer 23 controls the contactless switching devices 21-4, 21-5, and 21-2 to be turned on, electrically connecting the single-phase AC power supply terminal SP2 to one end U of the main winding 51 via the contactless switching device 21-5, and electrically connecting the single-phase AC power supply terminal SP1 to the other end V of the main winding 51 via the contactless switching device 21-4. On the other hand, regarding the one end Y and the other end X of the auxiliary winding 52, when the raising button switch 32 or the lowering button switch 33 is pressed, the one end Y is electrically connected to the single-phase AC power supply terminal SP1 via the contactless switching device 21-2 and the first crossover line 61, and the other end X is electrically connected to the single-phase AC power supply terminal SP2 via the phase advancing capacitor 65, the contacts 63a and 63b of the motor starting relay 63, and the second crossover line 62.

[0055] It should be noted that, similarly, during load reduction operation, when the main AC current flowing through the main winding 51 becomes no greater than a predetermined current value, the motor start relay 63 is activated at a predetermined timing to open contacts 63a and 63b, thereby shutting off the auxiliary current flowing through the auxiliary winding current path described above. Therefore, during load reduction operation, when the auxiliary current flowing through the auxiliary winding current path becomes no greater than a predetermined current value, the auxiliary current is shut off. Therefore, after the single-phase AC motor has started and reached a predetermined rotation speed, no auxiliary current flows through the auxiliary winding current path, thereby achieving energy savings. While this article describes an example of using the motor start relay 63 to connect and disconnect the current flowing through the auxiliary winding 52, any other contactless or contactless switch capable of connecting and disconnecting the current flowing through the auxiliary winding 52 may also be used.

[0056] Figure 3 It is a simple diagram showing the Figure 2 Another configuration configuration example of a motor-driven lifting device control apparatus using a single-phase AC motor 50 as a load lifting motor in the same manner is shown. Figure 3 The motor driven lifting device control device shown in Figure 2 The control device shown in the figure differs in that Figure 3 The control device in the embodiment connects the other end V of the main winding 51 of the single-phase AC motor 50 directly to the output terminal Wt of the control board 20 via the full-wave rectifier circuit 26, the exciting coil 27a of the electromagnetic brake 27 and the full-wave rectifier circuit 26, without using the motor starting relay 63 (in Figure 2 In the embodiment, the other end V of the main winding 51 is connected to the output terminal Wt of the control board 20 via the action coil 63c of the motor start relay 63 after being drawn out from the full-wave rectifier circuit 26, and the other difference is that the other end X of the auxiliary winding 52 of the single-phase AC motor 50 is connected to the single-phase AC power supply terminal SP2 (at the same time as the output terminal SP2) via the phase advancing capacitor 65 and the crossover line (second external wiring) 62. Figure 2 In the embodiment, the other end X of the auxiliary winding 52 is connected to the single-phase AC power supply terminal SP2 via contacts 63a and 63b of a motor start relay 63 and a crossover line (second external wiring) 62 after being drawn out from the phase advancing capacitor.

[0057] exist Figure 3In the motor-driven lifting device control apparatus shown in , when, for example, the lift button switch 32 of the operating unit 30 is pressed, an on-signal is output from the microcomputer 23 of the control circuit block 25 to the contactless switch devices 21-1 and 21-2 of the control board 20, and a single-phase AC current is supplied from the output terminals Ut and Vt to the main winding 51 and the auxiliary winding 52 of the single-phase AC motor 50. Therefore, a phase difference corresponding to the electrostatic capacitance of the phase-advancing capacitor 65 is generated between the main current and the auxiliary current flowing through the main winding 51 and the auxiliary winding 52 of the single-phase AC motor 50, respectively, and a rotating magnetic field that causes the rotor 53 to rotate in the load lifting direction is generated in the stator of the single-phase AC motor 50. Therefore, the rotor 53 rotates in the direction of rotation of the rotating magnetic field. At this point, and in terms of switching between forward and reverse rotation of the single-phase AC motor 50, Figure 3 The motor driven lifting device control device shown in Figure 2 In this example, when the current value of the main current becomes no greater than a predetermined value, a disconnection signal is output from the microcomputer 23 to the contactless switch device 21-2 at a predetermined timing, and the contactless switch device 21-2 is disconnected. As a result, the auxiliary current flowing through the auxiliary winding 52 is cut off (at Figure 2 In the motor-driven lifting device control device shown in , when the value of the main current becomes not greater than a predetermined value, the motor start relay 63 is activated to open its contacts 63a and 63b, thereby cutting off the auxiliary current).

[0058] As mentioned above, Figure 3 The motor driven lifting device control device shown in Figure 2 The same as shown in is that the single-phase AC current from the output terminals Ut and Vt of the control board 20 flows through the main winding 51 and the auxiliary winding 52 of the single-phase AC motor 50, thereby causing a rotating magnetic field to be generated in the stator of the single-phase AC motor 50 and thus causing the rotor 53 of the single-phase AC motor 50 to rotate in the load raising or lowering direction. Figure 3 The motor driven lifting device control device shown in Figure 2 The similarities shown in are also that, after a predetermined time has passed since the single-phase AC motor 50 starts rotating in the load lifting or lowering direction (for example, when the rotation becomes stable), the contactless switching device 21-2 is disconnected by a command signal from the microcomputer 23, thereby stopping the current flowing through the auxiliary winding 52 of the single-phase AC motor 50 after the disconnection, and thus making it possible to eliminate the energy consumed in the auxiliary winding 52, etc. thereafter, and therefore advantages can also be expected from the perspective of energy saving. Figure 3 The construction cost of the motor-driven lifting device control apparatus shown in can be reduced by an amount corresponding to the cost of the motor starting relay 63 to be used originally.

[0059] When a three-phase AC motor is used as a load lifting motor used in a motor-driven lifting device, such as Figure 1 As shown in FIG, the interphase voltage (the voltage between the S phase and the T phase) of the three-phase AC power supply 100 is introduced into the control power supply circuit 24. When a single-phase AC motor is used as a load lifting motor used in a motor-driven lifting device, as shown in FIG. Figure 2 or Figure 3 As shown in FIG, the single-phase voltage of the single-phase AC power supply 200 is introduced into the control power supply circuit 24. Figure 5 As shown in FIG, a single-phase voltage of 115V / 230V (commercial single-phase AC power supply voltage) is doubled by the voltage multiplication circuit of the control power supply circuit 24, thereby generating a voltage having the same value as the phase-to-phase voltage of 230V / 460V (commercial three-phase AC power supply voltage) of the three-phase AC power supply 100. In addition, the alternating current (AC) 230V / 460V is converted into a direct current (DC) 325V / 650V by the control power supply circuit 24, thereby making the control circuit block 25 compatible with single-phase and three-phase AC motors.

[0060] Figure 6 : is a simplified diagram showing an example of the configuration structure of the voltage multiplier circuit 40 of the control power supply circuit 24. The voltage multiplier circuit 40 includes an input section 41, a single-phase power supply reversing switch 42, a single-phase AC-DC converter 43, a DC circuit 44 and an output section 45. The single-phase power supply reversing switch 42 has fixed contacts 42a and 42b and a switching element 42c. The single-phase AC-DC converter 43 has four diodes D1 to D4. The cathode of diode D1 is connected to the anode of diode D3, and the cathode of diode D2 is connected to the anode of diode D4. The anodes of diodes D1 and D2 are connected to the anode wiring P, and the cathodes of diodes D3 and D4 are connected to the cathode wiring N, thereby forming a diode bridge. The DC circuit 44 includes four capacitors C1 to C4 and two resistors R1 and R2. The opposite ends of the series circuit of capacitors C1 and C3 and the series circuit of capacitors C2 and C4 are connected to the anode wiring P and the cathode wiring N, respectively. Furthermore, opposite ends of the series circuit of resistors R1 and R2 are respectively connected to an anode wiring P and a cathode wiring N. One end of the anode wiring P is connected to a terminal 45 a of an output section 45 , and one end of the cathode wiring N is connected to a terminal 45 b of the output section 45 .

[0061] The input terminal 41a of the input unit 41 is connected to the diode D of the single-phase AC-DC converter 43. lThe input terminal 41b of the input unit 41 is connected between the diodes D2 and D3, and the input terminal 41b of the input unit 41 is connected to one end of the switching element 42c of the single-phase power supply reversing switch 42. The fixed contact 42a of the single-phase power supply reversing switch 42 is connected between the diodes D2 and D4 of the single-phase AC-DC converter 43, and the fixed contact 42b of the single-phase power supply reversing switch 42 is connected between the capacitors C1 and C2 of the DC circuit 44, between the capacitors C2 and C4 connected to the DC circuit, and between the resistors R1 and R2 connected to the DC circuit. In addition, the corresponding ends of the anode wiring P and cathode wiring N provided in common with the single-phase AC-DC converter 43 and the DC circuit 44 are connected to the terminals 45a and 45b of the output unit 45, respectively.

[0062] In the voltage multiplication circuit 40, the input terminals 41a and 41b of the input section 41 are connected to the Figures 1 to 3 The pattern wirings 22-2 and 22-3 supplying terminals St and Tt shown in the figure are branched to pattern wirings 22-6 and 22-7 connected thereto, and a DC voltage is output from terminals 45a and 45b of an output section 45 to a control power supply circuit 24 through a voltage multiplication circuit 40.

[0063] When the single-phase AC motor 50 is used and the control power circuit 24 has Figure 6 When the voltage multiplier circuit 40 is arranged as shown in FIG, and when the single-phase power supply voltage value is 115V, the switching element 42c of the single-phase power supply switching switch 42 is switched to the fixed contact 42b side. Therefore, the connection point of the smoothing capacitors C1 and C3 of the DC circuit 44, the connection point of the smoothing capacitors C2 and C4 of the DC circuit, and further the connection point of the resistors R1 and R2 of the DC circuit are connected to the input terminal 41b (single-phase AC power supply terminal SP2). Therefore, in Figure 2 and Figure 3 The single-phase AC power voltage of 115 V input between the single-phase AC power terminals SP1 and SP2 shown in the figure is converted into an AC voltage having the same value as the phase-to-phase voltage of 460 V of the three-phase AC power supply 100, and the AC voltage 460 is converted into a DC 325 V / 650 V by the control power circuit 24, thereby making the control circuit block 25 compatible with three-phase and single-phase applications.

[0064] As described above, the control circuit block 25 mounted on the control board 20 includes a microcomputer 23 and a control power supply circuit 24. The microcomputer 23 stores a program for controlling the on / off switching of each of the contactless switching devices 21-1 to 21-5 in accordance with the voltage input to the three-phase contactless device (three-phase solid-state relay SSR) 21. The microcomputer 23 monitors the AC voltage input to each of the contactless switching devices 21-1 to 21-5 of the three-phase contactless device 21, calls up a program corresponding to the input AC voltage, and executes each program to control the operation of the motor-driven lifting device.

[0065] Figure 7 2 is a simplified diagram showing a process flow for controlling the load lifting operation. Here, it is desirable that, for example, the control board 20 is provided with a DIP (dual in-line package) switch (although not shown) in advance to switch whether a three-phase AC motor or a single-phase AC motor is used as the motor for lifting and lowering the load, so that the mode change can be performed by operating the DIP switch to change the wiring to Figure 1 The status shown in Figure 2 or Figure 3 In the state shown in FIG, a load lifting motor using a three-phase motor or a single-phase motor is switched as the motor-driven lifting device.

[0066] First, as described above, the DIP switch is operated to set the power supply to three-phase or single-phase, and the power supply is turned on at step ST1. Next, at step ST2, it is determined whether the power supply is three-phase or single-phase. If the power supply is three-phase, the process proceeds to the three-phase processing flow at step ST10. If the power supply is single-phase, the process proceeds to the single-phase processing flow at step ST30.

[0067] In the three-phase processing flow at step ST10, first, at step ST11, the frequency is detected, and if the detected frequency is 50 Hz, the process proceeds to the 50 Hz processing flow at step ST12. If the detected frequency is 60 Hz, the process proceeds to the 60 Hz processing flow at step ST13. In the 50 Hz processing flow at step ST12, first, at step ST14, the voltage is detected, and if the detected voltage is 200 V (at Figure 5 If the detected voltage is 400 V (in Figure 5 460V in the process), the process proceeds to 400V at step ST16 (in Figure 5 In the 60Hz processing flow at step ST13, first, at step ST17, the voltage is detected. If the detected voltage is 200V (in Figure 5If the detected voltage is 400 V (in Figure 5 460 V in the example), the process proceeds to the 400 V processing flow at step ST19. After the processing of each of steps ST15, ST16, ST18, and ST19 ends, the process proceeds to step ST20, in which each related program is called to perform operation processing on the three-phase AC motor 10.

[0068] In the single-phase processing flow at step ST30, first, at step ST31, the frequency is detected, and if the detected frequency is 50 Hz, the process proceeds to the 50 Hz processing flow at step ST32. If the detected frequency is 60 Hz, the process proceeds to the 60 Hz processing flow at step ST33. In the 50 Hz processing flow at step ST32, first, at step ST34, the voltage is detected, and if the detected voltage is 115 V (at Figure 5 If the detected voltage is 115V, the process proceeds to the 115V process at step ST35. If the detected voltage is 230V, the process proceeds to the 230V process at step ST36. In the 60Hz process flow at step ST33, first, at step ST37, the voltage is detected, and if the detected voltage is 115V (in Figure 5 If the detected voltage is 230V (in Figure 5 230 V), the process proceeds to the 230 V process at step ST39. After the processing at each of steps ST35, ST36, ST38, and ST39 ends, the process proceeds to step ST40, in which each related program is called to perform operation processing on the single-phase AC motor 50.

[0069] As described above, the motor-driven lifting device control device using the three-phase AC motor 10 (see Figure 1 ) and a motor-driven lifting device control device using a single-phase AC motor 50 (see Figure 2 and Figure 3 ) is constructed by using a control board 20 compatible therewith. In the load lifting operation implemented by using the control device, it is necessary to measure the current and electric power supplied to each motor (three-phase AC motor 10 and single-phase AC motor 50). When the motor is the three-phase AC motor 10, as Figure 1As shown in FIG, an R-phase current flowing through the pattern wiring 22 - 1 and a T-phase current flowing through the pattern wiring 22 - 3 are measured by current sensors 28R and 28T, respectively, and the measured values are sent to the microcomputer 23 to calculate the current and electric power through processing by the microcomputer 23 .

[0070] When the motor is a single-phase AC motor 50, as Figure 2 and Figure 3 As shown in FIG, the main current flowing through the main winding 51 of the single-phase AC motor 50 is measured by the current sensor 28R, and the measured main current value is sent to the microcomputer 23 to calculate the main current through processing by the microcomputer 23. It should be noted here that when the rotation of the single-phase AC motor 50 becomes stable after a predetermined time has passed since the start of the single-phase AC motor, the auxiliary current of the single-phase AC motor 50 is cut off due to the opening of the contactless switching device 21-2; therefore, the auxiliary current flowing through the auxiliary winding 52 is generally not taken into account in the calculation of the electric power for calculating the load applied to the output shaft of the motor.

[0071] When the motor is a three-phase AC motor 10, a three-phase AC power supply 100 with a voltage of 200 to 230 V or 400 to 460 V is used. When the motor is a single-phase AC motor 50, a single-phase AC power supply 200 with a voltage of 115 V or 230 V is used. When the single-phase AC motor 50 is connected to the control board 20, the boost current (main current) flowing through the main winding 51 of the single-phase AC motor 50 also flows through the current sensors 28R and 28T used to measure the R-phase and T-phase boost currents IR and IT of the three-phase AC motor 10. Therefore, the measurement range of the current sensors 28R and 28T is determined based on the boost current (main current) flowing through the main winding 51 of the single-phase AC motor 50. However, the current value flowing through each phase of the three-phase AC motor 10 is no more than half of the boost current (main current) flowing through the main winding 51 of the single-phase AC motor 50, and is therefore not suitable for calculating the current value and electric power value of the three-phase AC motor 10. Furthermore, in order to accurately detect the current and electric power values of both motors using a microcomputer, technical issues such as circuit complexity must be addressed to make the control device compatible with both three-phase and single-phase applications in terms of size and cost. Furthermore, the auxiliary current flowing through the auxiliary winding 52 of the single-phase AC motor 50 cannot be detected.

[0072] Figure 8 This is a diagram showing an example of the basic overall configuration structure of a motor-driven lifting device control device developed to solve the above-mentioned problems, which shows an example of using a three-phase AC motor 10 as a motor. This motor-driven lifting device control device is different from the following aspects. Figure 1The motor-driven lifting device control device shown in . The current sensor 28R provided on the pattern wiring 22-1 for supplying the R-phase current to the stator of the three-phase AC motor 10 of the control board 20 is removed; instead, a current sensor (Hall IC) 28S is provided on the pattern wiring 22-2 for supplying the S-phase current to the stator of the three-phase AC motor 10. In addition, the upper limit value of the current measurement range of the current sensor 28S is set based on the S-phase current flowing through the three-phase AC motor 10 (7A), and the upper limit value of the current measurement range of the current sensor (Hall IC) 28T is set based on the S-phase current flowing through the later-described Figure 9 is set based on the current of the main winding of the single-phase AC motor shown in FIG (15A). Therefore, by using two current sensors 28S and 28T having different upper limits for the current measurement range, the control board can be improved to be optimized for and compatible with both three-phase AC motors and single-phase AC motors. It should be noted that the withstand current value of current sensor 28S, which has a narrow measurement range selected based on the current value flowing through three-phase AC motor 10, is set to sufficiently exceed the maximum value of the current flowing through auxiliary winding 52 of single-phase AC motor 50.

[0073] Figure 9 This is a diagram showing an example of the basic overall configuration structure of a motor-driven lift control device developed to solve the above-mentioned problems, which shows an example of using a single-phase AC motor 50 as the motor. This motor-driven lift control device is different from the Figure 3 The motor-driven lifting device control device shown in FIG. The current sensor 28R provided on the pattern wiring 22-1 for supplying current to the main winding 51 of the single-phase AC motor 50 of the control board 20 is removed; instead, the current sensor 28S is provided on the pattern wiring 22-2 for supplying current to the auxiliary winding 52 of the single-phase AC motor 50 (this arrangement structure is the same as that of FIG. Figure 8 The arrangement structure of the control panel 20 of the motor-driven lifting device control device shown in FIG is the same). In addition, the upper limit value of the current measurement range of the current sensor 28S is based on the current flowing through the above-described Figure 8, the upper limit value of the current measurement range of the current sensor 28T provided on the pattern wiring 22-3 for supplying current to the main winding 51 of the single-phase AC motor 50 is set to (15A) based on the current flowing through the main winding 51 of the single-phase AC motor 50. That is, the detection (measurement) of the current and electric power of the single-phase AC motor 50 is improved by using two current sensors 28S and 28T with different current measurement ranges together. By improving the current detection accuracy as described above, the circuit of the single-phase AC motor (including the control board 20) can be made compatible with the three-phase AC motor, despite the fact that the single-phase AC motor has a rated current value that is not less than twice the rated current value of the three-phase AC motor.

[0074] Generally, in a single-phase AC motor, current is supplied to the main winding and the auxiliary winding while the motor is starting, and when the motor reaches a predetermined speed, the current to the auxiliary winding is cut off; therefore, the current flowing through the main winding is important in current and electric power detection (measurement). Figure 9 In the motor-driven lifting device control device arranged as shown in , the auxiliary current flowing through the auxiliary winding 52 is supplied only when the single-phase AC motor 50 is primarily started to perform a load lifting operation, and when the rotation speed reaches a predetermined rotation speed, the non-contact switch device 21-2 is opened under the control of the microcomputer 23, and the auxiliary current flowing through the auxiliary winding 52 is cut off. Therefore, even if the measurement result of the current sensor 28S exceeds the set maximum value, as long as the measured current value is within the tolerance current value range of the current sensor 28S, its influence is small. Figure 9 In the motor-driven lifting device control device shown in , the detection upper limit value of the current sensor 28S for detecting the auxiliary current flowing through the auxiliary winding 52 of the single-phase AC motor 50 is set to 7A. The current sensor 28S cannot accurately measure the current value flowing through the auxiliary winding 52 at startup, but can be used to detect the open phase of the auxiliary winding, etc. As described above, the motor-driven lifting device control device using a three-phase AC motor requires two current sensors to accurately detect the current and electric power. In this regard, by using a current sensor 28S with a narrow measurement range of 7A upper limit value selected based on the current flowing through the three-phase AC motor and a current sensor 28T with a wide current measurement range of 15A upper limit value selected based on the current flowing through the single-phase AC motor, as shown in Figure 8 and Figure 9As shown in FIG, the electric power detection (measurement) accuracy is improved compared to using two current sensors with a current measurement range of an upper limit value of 15 A to measure a current value not greater than one-fifth of the measurement range. Alternatively, the electric power value of the three-phase AC motor 10 may be calculated based solely on the output result of the current sensor 28S.

[0075] In addition, here, since the motor-driven lifting device control device ( Figure 8 ) and a motor-driven lifting device control device using a single-phase AC motor 50 ( Figure 9 ) are provided with current sensors 28S and 28T with different measuring ranges, and the current detection accuracy is improved, thereby enabling the detection circuit including the control board 20 for detecting current and electric power to be compatible with three-phase AC motors with small rated current (for example, 460V) and single-phase motors with large rated current (for example, 100V).

[0076] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment but can be modified in various ways without departing from the scope of the claims and the technical ideas indicated in the specification and the drawings.

[0077] For example, although Figure 8 and Figure 9 Although two current sensors 28S and 28T are provided on the control board 20 shown in FIG, the following arrangement may be employed. A current sensor 28R (not shown) having the same current measurement range as the current sensor 28S suitable for measuring the current value of the three-phase AC motor 10 may be provided on the common pattern wiring 22-1 that electrically connects the supply terminal Rt and the contactless switch devices 21-1 and 21-4 to calculate the electric power of the three-phase AC motor 10. This arrangement also allows accurate calculation of the electric power value.

[0078] Furthermore, three current sensors each having a different current measurement range may be provided as current sensors 28R, 28S, and 28T. This improves the accuracy of electric power calculation to a level not achievable with two different measurement ranges, and also allows the electric power of an AC motor having different current ranges to be measured.

[0079] In addition, the arrangement structure can also enable the output voltage of the three-phase AC power supply 100 or the single-phase AC power supply 200 to be phase-controlled through a contactless switching device (21-1 to 21-5) such as a three-terminal bidirectional thyristor (bidirectional thyristor), thereby making it possible to unify the type of the three-phase AC motor 10 or the single-phase AC motor 50 according to the voltage specifications or to increase the voltage range of the AC power supply suitable for the three-phase AC motor 10 or the single-phase AC motor 50.

[0080] Reference Signs List

[0081] 10: Three-phase AC motor

[0082] 11-1 to 11-3: Lead wires

[0083] 20: Control Panel

[0084] 21: Three-phase contactless device (solid-state relay SSR)

[0085] 21-1 to 21-5: Contactless switch devices

[0086] 22-1 to 22-7: Pattern wiring

[0087] 23: Microcomputer

[0088] 24: Control power circuit

[0089] 25: Control circuit block

[0090] 26: Full-wave rectifier circuit

[0091] 27: Electromagnetic brake

[0092] 27a: Excitation coil

[0093] 28R: Current sensor

[0094] 28S: Current sensor

[0095] 28T: Current sensor

[0096] 30: Operation unit

[0097] 31: Emergency button switch

[0098] 32: Lift button switch

[0099] 33: Lower button switch

[0100] 40: Voltage doubler circuit

[0101] 41: Input

[0102] 42: Single-phase power switching switch

[0103] 43: Single-phase AC-DC converter

[0104] 44: DC Circuit

[0105] 45: Output

[0106] 50: Single-phase AC motor (single-phase induction motor)

[0107] 51: Main winding

[0108] 52: Auxiliary winding

[0109] 53: Rotor

[0110] 61: Crossover line (first external wiring)

[0111] 62: Crossover line (second external wiring)

[0112] 63: Motor start relay

[0113] 65: Phase-advancing capacitor

[0114] 66-1 to 66-4: Lead wires

[0115] 100: Three-phase AC power supply

[0116] 200: Single-phase AC power supply

[0117] SP1: Single-phase AC power terminal

[0118] SP2: Single-phase AC power terminal

[0119] Rt: Supply terminal

[0120] St: Supply terminal

[0121] Tt: Supply terminal

[0122] Ut: output terminal

[0123] Vt: output terminal

[0124] Wt: output terminal

Claims

1. A motor-driven lifting device control device, characterized in that include: A control panel (20) is mounted with contactless switch devices (21-1 to 21-5) and a microcomputer (23) for controlling the on / off switching of the contactless switch devices. The control panel (20) has three supply terminals (Rt, St, Tt) on its input side, and three output terminals (Ut, Vt, Wt) corresponding to the supply terminals (Rt, St, Tt) on its output side. wherein, when a three-phase AC motor (10) is to be used, a three-phase AC power source (100) is connected to the supply terminals (Rt, St, Tt), and the three-phase AC motor (10) is connected to the output terminals (Ut, Vt, Wt), and the AC current to be supplied to the three-phase AC motor (10) is controlled by controlling the contactless switching devices (21-1 to 21-5) using a microcomputer (23); When the single-phase AC motor (50) is to be used, two supply terminals (Rt, St) of the three supply terminals (Rt, St, Tt) of the control board (20) are electrically connected together by a first connecting member (61) to form a single-phase AC power supply terminal (SP1) connected to one terminal of the single-phase AC power supply (200), and a second connecting member (62) is connected to the remaining supply terminal (Tt) to form a single-phase AC power supply terminal (SP2) connected to the other terminal of the single-phase AC power supply; A single-phase AC power supply (200) is connected between the single-phase AC power supply terminals (SP1, SP2); A main winding current path is formed such that an AC current outputted from a first output terminal (Ut) and an output terminal (Wt) corresponding to the remaining supply terminals (Tt) among output terminals (Ut, Vt) corresponding to the electrically connected supply terminals (Rt, St) is transferred through a main winding (51) of a single-phase AC motor (50), wherein the first output terminal and the output terminals corresponding to the remaining supply terminals are configured to be able to exchange phases; and An auxiliary winding current path is formed so that an AC current output from a second output terminal (Vt) among output terminals (Ut, Vt) corresponding to supply terminals (Rt, St) electrically connected together and the second connecting member (62) is transmitted through an auxiliary winding (52) of a single-phase AC motor (50), and the AC current to be supplied to the main winding (51) and the auxiliary winding (52) is controlled by controlling the contactless switching devices (21-1 to 21-5) using a microcomputer (23).

2. The motor-driven lifting device control device according to claim 1, wherein: When the three-phase AC motor (10) is used, switching between forward and reverse rotation of the three-phase AC motor (10) is implemented by switching two phases of the three-phase AC current by controlling the contactless switching devices (21-1 to 21-5) on and off; and When a single-phase AC motor (50) is used, switching between forward and reverse rotation of the single-phase AC motor (50) is implemented in the following manner, that is, switching is implemented so that by performing on-off control on the contactless switching devices (21-1 to 21-5), when the rotation is switched between forward and reverse, the phase of the main current flowing through the main winding (51) of the single-phase AC motor (50) is reversed by 180 degrees.

3. The motor-driven lifting device control device according to claim 1, wherein: The main winding current path includes a main winding (51), an input side of a full-wave rectifier circuit (26), and an actuating coil (63c) of a motor starter relay (63) connected in series, and also includes an exciting coil (27a) of an electromagnetic brake (27) connected to an output side of the full-wave rectifier circuit (26); The auxiliary winding current path includes an auxiliary winding (52), a phase-advancing capacitor (65), and contacts (63a, 63b) of a motor start relay (63) connected in series; The auxiliary winding current path can be controlled to be on or off by the motor starting relay (63).

4. The motor-driven lifting device control device according to claim 1, wherein: The main winding current path includes a main winding (51) and an input side of a full-wave rectifier circuit (26) connected in series, and also includes an excitation coil (27a) of an electromagnetic brake (27) connected to an output side of the full-wave rectifier circuit (26); The auxiliary winding current path includes an auxiliary winding (52) and a phase-advancing capacitor (65). The auxiliary winding and the phase-advancing capacitor are connected in series so that, according to the magnitude of the current flowing through the main winding current path of the single-phase AC motor, the current flowing through the auxiliary winding current path can be cut off by controlling the on / off of a contactless switch device (21-2) using a microcomputer (23).

5. The motor-driven lifting device control device according to any one of claims 1 to 4, wherein: Two pattern wirings (22-2, 22-3) among pattern wirings (22-1, 22-2, 22-3) respectively connected to supply terminals (Rt, St, Tt) are provided with current sensors (28S, 28T) having different measurement ranges.

6. The motor-driven lifting device control device according to claim 1, wherein: A pattern wiring (22-3) for supplying current to a main winding (51) of a single-phase AC motor (50) is provided with a current sensor (28T) having a large measuring range, and a pattern wiring (22-2) for supplying current to an auxiliary winding (52) of the single-phase AC motor (50) is provided with a current sensor (28S) having a small measuring range.

7. The motor-driven lifting device control device as described in any one of claims 1 to 4 and 6 is provided with a control power supply circuit (24), which includes a single-phase voltage doubling circuit (40), and the single-phase voltage doubling circuit is supplied with the phase-to-phase voltage between two phases of the three-phase AC power supply (100) connected to the supply terminals (Rt, St, Tt) or the single-phase voltage of the single-phase AC power supply (200) connected to the single-phase AC power supply terminals (SP1, SP2) as input, and the single-phase voltage doubling circuit (40) is configured so that when the single-phase voltage is input thereto, the single-phase voltage doubling circuit (40) doubles the input voltage, thereby making the input voltage equal to the phase-to-phase voltage between two phases in the three-phase AC power supply, and thus making the control circuit block (25) including the microcomputer (23) and the control power supply circuit (24) compatible with three-phase and single-phase applications.

8. The motor-driven lifting device control device as described in claim 5 is provided with a control power supply circuit (24), which includes a single-phase voltage doubling circuit (40), and the single-phase voltage doubling circuit is supplied with the phase-to-phase voltage between two phases of the three-phase AC power supply (100) connected to the supply terminals (Rt, St, Tt) or the single-phase voltage of the single-phase AC power supply (200) connected to the single-phase AC power supply terminals (SP1, SP2) as input, and the single-phase voltage doubling circuit (40) is configured so that when the single-phase voltage is input thereto, the single-phase voltage doubling circuit (40) doubles the input voltage, thereby making the input voltage equal to the phase-to-phase voltage between two phases in the three-phase AC power supply, and thus making the control circuit block (25) including the microcomputer (23) and the control power supply circuit (24) compatible with three-phase and single-phase applications.

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