Motor control device and wire winding device

Abstract

This invention provides a motor control device and a wire winding device that enable users to control the rotation speed of a motor simply by connecting a simple configuration to an inverter. [Solution] The motor control device 1A includes an operation device 16 that transmits a signal whose voltage changes according to the tilt of an analog stick; a computer 17 that has multiple output pins that output signals of the same voltage and changes the output pin that outputs a signal according to the voltage of the signal from the operation device 16; a voltage adjustment circuit 15 to which each output pin of the computer 17 is connected and which adjusts the voltage of the signal output from the output pins to output different voltages according to the output pin that output the signal; and an inverter 12 to which the voltage adjustment circuit 15 is connected and which changes the frequency of the AC current supplied to the motor 4 when it receives a signal whose voltage has been adjusted by the voltage adjustment circuit 15.

Description

Technical Field

[0001] The present invention relates to a motor control device and a wire winding device.

Background Art

[0002] A wire winding device is used for winding a wire installed on a utility pole. Some wire winding devices are configured to rotate a drum manually using a hydraulic lever to wind the wire, and the operation of the hydraulic lever places a burden on the operator. To solve such problems, a wire winding device has been developed in which a motor is attached to the drum and the motor is controlled by an inverter. For example, Patent Document 1 discloses a reel winder capable of rotating a reel corresponding to a drum by controlling a motor with an inverter and winding a wire around the reel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the reel winder of Patent Document 1, the rotational torque of the motor required is calculated based on the tension of the wire wound around the reel and the winding body diameter of the wire wound around the reel, and the inverter is controlled. However, the reel winder of Patent Document 1 does not have a means for adjusting the rotational speed of the motor as desired by the user, and cannot meet the desire to timely adjust the rotational speed of the drum according to the state of the wire observed by the user. Such a problem exists not only when controlling the motor of a wire winding device but also when controlling the motor of other devices.

[0005] This invention was made based on the above background, and aims to provide a motor control device and a wire winding device that enable the user to control the rotation speed of the motor simply by connecting a simple configuration to the inverter. [Means for solving the problem]

[0006] To achieve the above objective, the motor control device according to the present invention is An operating device that transmits a signal whose voltage changes according to the tilt of the analog stick, A computer having multiple output pins that output signals of the same voltage, and changing the output pins that output signals according to the voltage of the signal from the operating device, Each output pin of the computer is connected to a voltage adjustment circuit that adjusts the voltage of the signal output from the output pin so as to output a different voltage depending on the output pin that outputs the signal. The aforementioned voltage adjustment circuit is connected, and an inverter that changes the frequency of the AC current supplied to the motor when it receives a signal with the voltage adjusted by the aforementioned voltage adjustment circuit, It is equipped with. [Effects of the Invention]

[0007] According to the present invention, a motor control device and a wire winding device can be provided that enable the user to control the rotational speed of the motor simply by connecting a simple configuration to the inverter. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram shows the configuration of a wire winding device according to an embodiment of the present invention. [Figure 2] This figure shows the configuration of a motor control device according to an embodiment of the present invention. [Figure 3] This is a circuit diagram showing the circuit configuration of a motor control device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0009] Hereinafter, a motor control device and a wire winding device according to embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are denoted by the same reference numerals.

[0010] The wire winding device according to this embodiment is a device that winds a wire onto a drum by rotating the drum with a motor. A motor control device is connected to the motor, and the rotation speed of the motor is adjusted by changing the frequency of the alternating current supplied to the motor from the inverter of the motor control device. The motor control device is a device that, when the user tilts the analog stick of the operating device, supplies a signal (frequency setting signal) with a voltage changed according to the tilt to the primary side of the inverter, thereby changing the frequency of the alternating current supplied to the motor from the secondary side of the inverter. The operating device is, for example, a game controller equipped with an analog stick.

[0011] The specific mechanism for supplying frequency setting signals to the inverter is as follows: First, when the user tilts the analog stick of the control device from its initial position, the control signal (analog signal), whose voltage changes according to the tilt of the analog stick, is converted into a digital signal by an AD converter and supplied to the computer. The computer is equipped with GPIO (General Purpose Input Output) pins that can output signals of the same voltage, and the computer's memory stores a program that changes the output pin that outputs the signal according to the voltage of the analog signal from the analog stick. In addition, a voltage adjustment circuit that outputs a signal of a different voltage according to the output pin that output the signal is connected to each output pin, and this voltage adjustment circuit is connected to the primary side of the inverter. As a result, when the user changes the tilt of the analog stick of the control device, the voltage of the signal input to the primary side of the inverter changes. The above describes the mechanism for supplying frequency setting signals to the inverter.

[0012] Next, with reference to Figure 1, the configuration of the wire winding device 1 according to the embodiment will be described. The electric wire winding device 1 comprises a track 2, a drum 3 mounted on the track 2 and capable of winding electric wire C, a motor 4 capable of rotating the drum 3 while mounted on the track 2, and a motor control device 1A electrically connected to the motor 4 and controlling the rotation of the motor 4.

[0013] The drum 3 comprises a cylindrical rotating body and a pair of discs attached to both sides of the rotating body to guide the electric wire C to be wound up. The rotating body of the drum 3 is provided with a rotating shaft, which is rotatably supported by a support installed on the loading platform of the truck 2.

[0014] Motor 4 is, for example, a three-phase induction motor driven by three-phase alternating current. A spur gear is provided on the rotating shaft of motor 4, and the rotation of motor 4 is transmitted to drum 3 by meshing this spur gear with a spur gear provided on the rotating shaft of drum 3.

[0015] Next, the configuration of the motor control device 1A according to the embodiment will be described with reference to Figures 2 and 3. As shown in Figure 2, the motor control device 1A comprises a generator 11, an inverter 12, a transformer 13, a plurality of relays 14a and 14b, a voltage regulation circuit 15, an operating device 16, and a computer 17. All components of the motor control device 1A except the operating device 16 are mounted on track 2. The operating device 16 is connected to the computer 17 via wireless communication, such as short-range wireless communication. Therefore, the motor control device 1A can be remotely controlled using the operating device 16.

[0016] The motor 4 controlled by the motor control device 1A is supplied with a three-phase 200V AC current as motor drive power from the inverter 12. The motor 4 is equipped with a brake drive unit, and a single-phase 100V AC current is supplied to the brake drive unit from the transformer 13 as brake drive power.

[0017] The generator 11 is electrically connected to an inverter 12, a transformer 13, and a computer 17 via cables respectively. The inverter 12 is electrically connected to a plurality of relays 14a and a voltage adjustment circuit 15 via cables respectively. The transformer 13 is electrically connected to a relay 14b via a cable. The computer 17 is electrically connected to each of the relays 14a, 14b, and the voltage adjustment circuit 15 via a cable.

[0018] The generator 11 is an example of an AC power supply that supplies an alternating current to the inverter 12, the transformer 13, and the computer 17. The generator 11 supplies, for example, a single-phase 100V alternating current.

[0019] The inverter 12 is a device that controls the rotational speed of the motor 4 by controlling the frequency of the alternating current supplied to the motor 4. The inverter 12 converts the current from the generator 11 input on the primary side into a direct current, and performs pulse width modulation (PWM) control on the converted direct current to output an alternating current with an adjusted frequency from the secondary side. In the inverter 12, for example, a single-phase 100V alternating current received from the generator 11 is boosted to three-phase 200V.

[0020] In the inverter 12, an external operation mode in which the operation is controlled by a signal from the outside is selected as the operation mode. As shown in FIG. 3, a control signal interface 12a and a frequency setting signal interface 12b are provided on the primary side of the inverter 12. The output terminals of the four relays 14a are electrically connected to the input terminals of the control signal interface 12a respectively, and a control signal is supplied from the output terminals of each relay 14a. Each input terminal of the control signal interface 12a corresponds to forward rotation start (STF), reverse rotation start (STR), low-speed rotation (RL), and high-speed rotation (RW) respectively. The control signal interface 12a is provided with a contact input common (SD) terminal, and the SD terminal is connected to each relay 14a via a common line.

[0021] The control signals are voltage signals that are switched on and off by each relay 14a. When the primary side of the inverter 12 receives the control signals, the secondary side of the inverter 12 outputs an AC current whose frequency is adjusted to cause the motor 4 to perform either forward rotation, reverse rotation, high-speed rotation, or low-speed rotation. The motor 4 should first perform either forward rotation or reverse rotation, and then either high-speed rotation or low-speed rotation. This allows the motor 4 to operate in four patterns: forward rotation + low speed, forward rotation + high speed, reverse rotation + low speed, and reverse rotation + high speed.

[0022] Furthermore, a voltage adjustment circuit 15 is connected to the input terminal of the frequency setting signal interface 12b via a cable, and the aforementioned frequency setting signal is input from the voltage adjustment circuit 15. The frequency setting signal interface 12b is provided with a common (COM) terminal, and the COM terminal is connected to the ground (GND) pin of the computer 17 via a common wire.

[0023] The frequency setting signal is an analog voltage signal whose voltage changes according to the target rotational speed of the motor 4. The voltage of the frequency setting signal is adjusted by tilting the analog stick of the control device 16. When the primary side of the inverter 12 receives the frequency setting signal, the secondary side of the inverter 12 supplies an AC current to the motor 4 with a frequency changed according to the voltage of the frequency setting signal. This allows the rotational speed of the motor 4 to be changed in a timely manner using the analog stick of the control device 16.

[0024] The transformer 13 is a device that changes the voltage of the alternating current from the generator 11. The transformer 13 is electrically connected to the brake drive unit of the motor 4, and when it receives a brake signal from the relay 14b (described later), it supplies the brake drive unit with an alternating current that has been boosted from a single-phase 100V alternating current to a single-phase 200V alternating current.

[0025] Relays 14a and 14b are components that open and close electrical circuits, such as electromagnetic relays. An electromagnetic relay comprises a coil that generates a magnetic force when a DC current is input, and a switch that turns on the electrical circuit when a magnetic force is generated in the coil.

[0026] When relay 14a receives a signal from the output pin of the computer 17's GPIO, it turns on the electrical circuit connecting the computer 17 and the inverter 12. The input terminal of each relay 14a is connected to the power pin of the computer 17's GPIO, and the output terminal of each relay 14a is connected to the input terminal of the inverter 12's control signal interface 12a. The control terminal of each relay 14a is connected to the output pin of the computer 17's GPIO. When each relay 14a receives a signal from one of the computer 17's output pins, it supplies the signal from the computer 17's power pin to the input terminal of the inverter 12's control signal interface 12a, causing the inverter 12 to execute the function assigned to it.

[0027] When relay 14b receives a signal from the output pin of the computer 17's GPIO, it turns on the electrical circuit connecting the computer 17 and the transformer 13. The input terminal of each relay 14b is connected to the power pin of the computer 17's GPIO, and the output terminal of each relay 14b is connected to the input terminal of the transformer 13. The control terminal of each relay 14b is connected to the output pin of the computer 17's GPIO. When each relay 14b receives a signal from one of the computer 17's output pins, it supplies the signal from the computer 17's power pin to the input terminal of the transformer 13, thereby outputting a single-phase 200V AC current and causing the motor 4 to lose power. This allows the motor 4 to be stopped even if the inverter 12 continues to issue an operation command to the motor 4.

[0028] The voltage adjustment circuit 15 is a circuit that adjusts the voltage of the signals received from each output pin of the computer 17's GPIO to a different voltage. The voltage adjustment circuit 15 is provided with five rows of resistors 15a to 15e, each consisting of a different number of resistors R connected in series. One end of each row of resistors 15a to 15e is connected to an output pin via a cable, and the other end of each row of resistors 15a to 15e is connected to the GPIO's GND pin via a cable.

[0029] Each row of resistors 15a to 15e is connected to the input terminal of the frequency setting signal interface 12b via a cable. In row 15a, since there is only one resistor R, the cable connecting to the input terminal of the frequency setting signal interface 12b is connected to the same side as the GPIO's GND pin. In each row of resistors 15b to 15e, the cable connecting to the input terminal of the frequency setting signal interface 12b is connected between two adjacent resistors R, forming a wired OR. This allows the voltage to be divided from the voltage of the signal output from each output pin of the GPIO based on the voltage division rule.

[0030] The voltages taken from each resistor row 15a to 15e of the voltage adjustment circuit 15 are all input to the input terminal of the frequency setting signal interface 12b of the inverter 12. Since the voltage of the frequency setting signal output by each resistor row 15a to 15e is different, when the output pin of the GPIO that outputs the signal changes, the voltage of the frequency setting signal output from the voltage adjustment circuit 15 also changes. In the example in Figure 3, five resistor rows 15a to 15e are provided, and the circuit is configured to take voltage divisions from each, so that five frequency setting signals with different voltages can be taken. This makes it possible to change the frequency of the AC current supplied from the inverter 12 to the motor 4 in five steps.

[0031] Returning to Figure 2, the operating device 16 comprises four rotation control buttons, an emergency stop button, and an analog stick. The four rotation control buttons are a forward rotation start button, a reverse rotation start button, a high-speed rotation button, and a low-speed rotation button. When each button is pressed, a digital signal corresponding to the button is sent to the computer 17. The analog stick is equipped with a variable resistor that changes its resistance value depending on its tilt, and when the analog stick is tilted from its initial position, it sends an analog signal with a voltage corresponding to the tilt to the computer 17.

[0032] Computer 17 is, for example, a single-board computer. A single-board computer is a small computer in which input / output interfaces, memory, and a processor are mounted on a single circuit board. The various parts of computer 17 are interconnected via an internal bus (not shown). For computer 17, for example, a Raspberry Pi may be used.

[0033] The input / output interface (I / O interface) exchanges signals with external devices. For example, the I / O interface includes a communication antenna for wireless communication with external devices. It also includes a GPIO (General Purpose Identification) pin for exchanging signals with external devices via a cable. The pins that make up the GPIO include a power pin, a ground (GND) pin, and an output pin. The power pin outputs a constant voltage signal (e.g., DC 5V) that supplies power to relays 14a and 14b. The GND pin is for grounding electronic components.

[0034] The output pins output a constant voltage signal (e.g., DC 3.3V) with a lower voltage than the signal output from the power pins, which controls the operation of the inverter 12 and transformer 13. Four output pins are used for forward starting, reverse starting, high-speed rotation, and low-speed rotation; five are used to change the frequency of the inverter 12's output voltage according to the analog voltage from the operating device 16; and one is used to turn relay 14b on and off.

[0035] Memory, for example, includes RAM (Random Access Memory) and ROM (Read Only Memory), and stores programs and various data executed by the processor, as well as functioning as work memory for the processor to execute processes.

[0036] The processor, for example, includes a CPU (Central Processing Unit) and controls various parts of the computer 17. The processor executes a program stored in memory to control the inverter 12 based on the operation signals of the operation device 16. Specifically, when it receives a digital signal (operation signal) from each button of the operation device 16, it outputs a signal from the GPIO output pin corresponding to each button and turns on one of the relays 14a or 14b connected to that output pin. Also, when it receives a digital signal obtained by converting an analog signal (operation signal) with a voltage change based on the tilt of the analog stick from the operation device 16 using an AD converter, it changes the output pin that outputs the signal according to that voltage. The above describes the configuration of the motor control device 1A.

[0037] Next, we will explain the process of winding up an electric wire using the electric wire winding device 1 according to the embodiment. Hereinafter, we will assume that one end of the electric wire C has been removed from the utility pole and set in the drum 3.

[0038] First, the generator 11 of the motor control device 1A starts generating power, and the inverter 12, transformer 13, and computer 17 are started.

[0039] Next, the user operates the control device 16 to adjust the rotation speed and direction of the motor 4. Specifically, when the user first presses the forward start button or reverse start button on the control device 16, the output pins in the GPIO of the computer 17 corresponding to the forward start or reverse start output a signal, turning on the relay 14a and supplying a control signal to the inverter 12. As a result, the motor 4 starts rotating in either the forward or reverse direction and continues to rotate at a constant rotation speed.

[0040] Subsequently, to adjust the rotation speed of motor 4 to a low or high speed, the user operates the low-speed or high-speed button on the control device 16. When motor 4 has started rotating forward or backward, pressing the low-speed or high-speed button on the control device 16 causes the output pins corresponding to low speed or high speed in the GPIO of computer 17 to output a signal, turning on relay 14a and supplying a control signal to inverter 12. As a result, the rotation speed of motor 4 changes to either a low or high speed.

[0041] To adjust the rotation speed of motor 4 in multiple stages, the user operates the analog stick on the control device 16. When motor 4 has started rotating forward or backward, the user operates the analog stick, and an analog signal with a voltage corresponding to the tilt of the analog stick is output. This signal is converted to a digital signal by an AD converter and then transmitted to the computer 17. The computer 17 executes a program stored in memory and outputs a signal from an output pin selected according to the voltage of the digital signal. The voltage adjustment circuit 15 extracts a voltage divider corresponding to the output pin that outputs the signal, and the frequency setting signal with the voltage adjusted in this way is supplied to the input terminal of the frequency setting signal interface 12b of the inverter 12. This allows the rotation speed of motor 4 to be adjusted in five stages using the analog stick. Note that when the analog stick is returned to its initial position, no analog signal is output from the control device 16, and motor 4 stops rotating. Therefore, to keep motor 4 rotating, the user must continue to tilt the analog stick.

[0042] To perform an emergency stop on motor 4, the emergency stop button on the control device 16 is pressed. This causes the output pin corresponding to the emergency stop on the computer 17's GPIO to output a signal, turning on relay 14b and supplying a brake signal to transformer 13. Transformer 13 then supplies single-phase 200V AC current to the brake drive unit of motor 4, causing motor 4 to lose power and perform an emergency stop. The above is the procedure for winding up electrical wires.

[0043] As described above, the motor control device 1A according to the embodiment includes an operation device 16 that transmits a signal whose voltage changes according to the tilt of an analog stick, a computer 17 that has multiple output pins that output signals of the same voltage and changes the output pin that outputs a signal according to the voltage of the signal from the operation device 16, a voltage adjustment circuit 15 to which each output pin of the computer 17 is connected and which adjusts the voltage of the signal output from the output pins to output different voltages according to the output pin that output the signal, and an inverter 12 to which the voltage adjustment circuit 15 is connected and which changes the frequency of the AC current supplied to the motor 4 when it receives a signal whose voltage has been adjusted by the voltage adjustment circuit 15.Therefore, by simply adding the voltage adjustment circuit 15, the operation device 16 and the computer 17 to the inverter 12, the rotation speed of the motor 4 can be controlled, and one person can perform wire winding work.In addition, remote operation by the user can be realized by wireless communication between the operation device 16 and the computer 17.

[0044] The present invention is not limited to the embodiments described above, and the following modifications are also possible.

[0045] (modified version) In the above embodiment, a generator 11 was used as the AC power source, but the present invention is not limited thereto. For example, a battery may be used as the AC power source.

[0046] In the above embodiment, power was supplied to the computer 17 from the generator 11, but the present invention is not limited to this. A power source other than the generator 11, for example, a power source built into the computer 17, may be used.

[0047] In the above embodiment, the power supply voltage was supplied to the relays 14a and 14b from the computer 17, but the present invention is not limited to this. The power supply voltage may be supplied to the relays 14a and 14b from a power source other than the computer 17.

[0048] In the above embodiment, the inverter 12 and transformer 13 and the computer 17 were connected via relays 14a and 14b, but the present invention is not limited to this. Depending on the type of computer 17, relays 14a and 14b may be omitted and the inverter 12 and transformer 13 may be connected directly.

[0049] In the above embodiment, the analog signal supplied from the operating device 16 was converted into a digital signal by an AD converter, but the present invention is not limited to this. For example, the computer 17 may be provided with a function to convert the analog signal into a digital signal.

[0050] In the above embodiment, the operating device 16 output an analog signal whose voltage was changed according to the tilt of the analog stick, but the present invention is not limited to this. For example, the operating device 16 may output a digital signal whose voltage was changed according to the tilt of the analog stick.

[0051] In the above embodiment, each row of resistors 15a to 15e was arranged on a separate board from the single-board computer's circuit board, but the present invention is not limited to this. For example, each row of resistors 15a to 15e may be arranged on the single-board computer's circuit board.

[0052] In the above embodiment, there were five rows of resistors 15a to 15e in the voltage adjustment circuit 15, but the present invention is not limited to this. For example, if it is desired to adjust the rotation speed of the motor 4 in six or more steps, the number of rows of resistors in the voltage adjustment circuit 15 may be increased to six or more.

[0053] In the above embodiment, the voltage of the signal from the output pin was adjusted by a series of resistors 15a to 15e, but the present invention is not limited to this. For example, the voltage of the signal from the output pin may be adjusted using a capacitor, or by combining an AD converter and a DA converter.

[0054] In the above embodiment, the grounding terminals of relays 14a and 14b and the resistor rows 15a to 15e were grounded by being connected to the GND pin of the computer 17, but the present invention is not limited to this. Other means other than the GND pin of the computer 17 may be used for grounding.

[0055] In the above embodiment, the drum 3, motor 4, and motor control device 1A were mounted on the truck 2, but the present invention is not limited to this. These may also be mounted on other vehicles, such as a towed vehicle.

[0056] The embodiments described above are illustrative, and the present invention is not limited thereto. Various embodiments are possible without departing from the spirit of the invention as described in the claims. The components described in the embodiments and modifications can be freely combined. Furthermore, inventions equivalent to the invention described in the claims are also included in the present invention. [Explanation of symbols]

[0057] 1. Wire winding device 3 Drums 4 motors 1A Motor Control Unit 12 Inverters 15 Voltage Regulating Circuit 16 Operating Devices 17 Computer C Electric wire R resistor

Claims

1. An operating device that transmits a signal whose voltage changes according to the tilt of the analog stick, A computer having multiple output pins that output signals of the same voltage, and changing the output pins that output signals according to the voltage of the signal from the operating device, Each output pin of the computer is connected to a voltage adjustment circuit that adjusts the voltage of the signal output from the output pin so as to output a different voltage depending on the output pin that outputs the signal. The aforementioned voltage adjustment circuit is connected, and an inverter that changes the frequency of the AC current supplied to the motor when it receives a signal with the voltage adjusted by the aforementioned voltage adjustment circuit, A motor control device equipped with the following features.

2. The voltage adjustment circuit is provided with multiple rows of resistors, each row of resistors connected in series, and a voltage divider is extracted from the signal input from the output pin to the end of the row of resistors. The motor control device according to claim 1.

3. One end of the row of resistors is connected to the output pin of the computer, and the other end of the row of resistors is connected to the ground pin of the computer. The input terminal of the inverter is connected between two adjacent resistors in the row of resistors. The motor control device according to claim 2.

4. A motor control device according to any one of claims 1 to 3, A motor connected to the inverter of the motor control device and driven by the alternating current supplied from the inverter, A drum connected to the motor so as to transmit rotation from the motor, and capable of winding up an electric wire as the motor rotates, A wire winding device equipped with [a specific feature].

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