JP2010064349A - Molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large-sized electromotive molding machine which is simple in structure, inexpensive, and easily operable. <P>SOLUTION: Multi-winding three-phase motors are used as first and second electric servomotors 13, 14 for injection. In accordance with each electric servomotor 13 or 14, servo-amplifiers 5A-5D and inverters 6A-6D of a number corresponding to the winding number of the motor are connected. One of the servo-amplifiers 5A-5D is made a master servo-amplifier, and the others are made slave servo-amplifiers. An encoder which detects its rotation direction and rotation quantity is provided in one electric servomotor for injection, and its output signal is supplied to each servo-amplifier 5A-5D. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molding machine such as an injection molding machine or a die-casting machine, and more particularly to a motor drive control device provided in a multi-motor type molding machine that drives one movable part using a plurality of electric servo motors.

  There are roughly two types of molding machines: hydraulically driven molding machines (hydraulic molding machines) and electrically driven molding machines (electrical molding machines). The interior is not contaminated with hydraulic oil, and more accurate position control and speed control are possible compared to hydraulic molding machines, so as a drive source for injection devices, mold opening and closing devices, extrusion devices, etc. that are movable parts Electric molding machines using electric servomotors are becoming popular.

  However, since there is a limit to the maximum torque that can be obtained with one electric servomotor, a large molding machine is equipped with multiple electric servomotors corresponding to one movable part, and each electric servomotor is driven synchronously. Thus, it has been proposed to obtain a necessary torque (see, for example, Patent Document 1).

A three-phase motor is generally used as an electric servomotor for a molding machine. If a single-turn three-phase motor with a large output is provided in the molding machine, the maximum withstand voltage of the inverter can be controlled. It is necessary to increase the maximum current and the control current such as a servo controller. In order to solve this problem, a multi-winding three-phase motor is used as an electric servo motor for a molding machine, and a three-phase inverter and a servo controller are connected to each three-phase winding, and each servo controller is connected to each other. A technique for controlling the drive currents supplied from the respective three-phase inverters to the respective three-phase windings to coincide with each other has also been conventionally proposed (see, for example, Patent Document 2).
JP 11-28751 A Japanese Patent No. 3661578

  However, the technique disclosed in Patent Document 1 is provided with a master servo amplifier corresponding to any one of two or more electric servo motors that drive the movable part of the molding machine, and is compatible with other electric servo motors. A slave servo amplifier is provided, and the master servo amplifier drives and controls one servo motor corresponding to the operation command signal output from the host motion controller, and outputs a torque command signal to the slave servo amplifier. The slave servo amplifier is configured to perform torque control on another corresponding electric servo motor based on the torque command signal output from the master servo amplifier. The drive amount is controlled by the rotation amount of two electric servo motors and the slave servo amplifier. Deviation is likely to occur between the other rotation of the electric servo motor which is. In order to correct this, the technique disclosed in Patent Document 1 connects the motor shafts of the respective electric servomotors and the rotation shafts of the movable parts that are rotationally driven by these electric servomotors with a belt. According to the configuration, the structure of the molding machine is complicated, the cost of the molding machine is increased, and the design of the movable part is difficult.

  On the other hand, since the technique disclosed in Patent Document 2 includes two servo amplifiers corresponding to one multi-turn three-phase motor, if this technique is applied, a large-output electric servo motor can be mounted. Thus, the electric molding machine can be further increased in size.

  However, the technique disclosed in Patent Document 2 is provided with two servo amplifiers corresponding to one multi-turn three-phase motor, and no technique is disclosed regarding providing a plurality of electric servo motors in one movable part. As such, it cannot be applied to a large molding machine that requires a large torque for driving the movable part.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a large-sized electric molding machine that has a simple structure and can be easily implemented at low cost.

  In order to achieve this object, according to the present invention, first, a plurality of multiple-turn three-phase servomotors, a position detector provided in one of the plurality of multiple-turn three-phase servomotors, A plurality of motion conversion mechanisms each having a rotating portion that is rotationally driven by a phase servo motor and a linear motion body that is moved forward and backward by the rotating portion, and wherein the rotating portion is directly connected to each of the plurality of multiple-turn three-phase servo motors; A motion controller for instructing the operation of the linear motion body, a master servo amplifier for driving one of the plurality of three-turn servo motors based on a drive command signal output from the motion controller, and the master servo amplifier A molding machine including a slave servo amplifier that drives another multiple-turn three-phase servomotor based on a synchronization control signal output from One master servo amplifier and one or more slave servo amplifiers are provided corresponding to one of the three-phase servo motors, and one to a plurality of slave servo amplifiers are provided corresponding to each of the other multiple-turn three-phase servo motors. The slave servo amplifier is provided, and the master servo amplifier and the slave servo amplifier perform feedback control on the plurality of three-turn servo motors using the output signal of the position detector as a feedback amount.

  According to this configuration, all the servo amplifiers are provided with a plurality of windings arranged to drive one movable part using an output signal of a position detector provided in one winding three-phase servomotor as a feedback amount. Since feedback control is performed on the three-phase servo motor, the rotation speed and the rotation amount of the plurality of multiple-turn three-phase servo motors can be synchronized with high accuracy. Therefore, it is not necessary to connect a plurality of multiple-turn three-phase servomotors and a rotating part of a movable part driven by the plurality of multiple-turn three-phase servomotors with a belt or the like. Each can be directly connected to the rotating part of the motion conversion mechanism corresponding to each of the multiple winding three-phase servo motors, and the cost of the electric molding machine can be reduced, and the configuration of the movable part can be simplified, The degree of design freedom can be increased. In addition, one master servo amplifier and one to a plurality of slave servo amplifiers are provided corresponding to one of a plurality of multi-turn three-phase servo motors, and each of the other multi-turn three-phase servo motors is provided. Since one to a plurality of slave servo amplifiers are provided, it is possible to mount a high-power, multiple-turn, three-phase servomotor, and to increase the size of the electric molding machine.

  Secondly, in the first molding machine, the present invention provides a ball screw mechanism comprising a screw shaft that is rotationally driven by the multi-turn three-phase servo motor and a nut body that is screwed to the motion converting mechanism. It was configured to use.

  According to this configuration, since a ball screw mechanism having excellent linearity of the linear motion body (nut body) is used as the motion conversion mechanism, position control of the injection device, mold opening / closing device, extrusion device and the like driven through the linear motion body and Speed control can be performed with high accuracy.

  Thirdly, according to the present invention, in the first molding machine, as the motion conversion mechanism, a first arm that is rotationally driven by the multi-turn three-phase servomotor and one end are rotatably coupled to the first arm. The other end of the crank mechanism is composed of a second arm rotatably coupled to the linear motion body.

  According to this configuration, since the crank mechanism that changes the torque acting on the linear motion body according to the rotation angle of the first arm is used as the motion conversion mechanism, the largest torque is exerted on the linear motion body in a process that requires the largest torque. By adjusting the initial position of the first arm so as to act, waste of the output torque of the multi-turn three-phase servomotor can be eliminated, and the multi-turn three-phase servomotor can be miniaturized. Further, since the crank mechanism is superior in dust resistance as compared with the ball screw mechanism, the crank mechanism is suitable for a die casting machine used in a work environment with a lot of dust, and can be a die casting machine that is easy to maintain and hardly breaks down.

  The molding machine of the present invention includes one master servo amplifier and one to a plurality of slave servo amplifiers corresponding to one of a plurality of multi-turn three-phase servo motors, and each of the other multi-turn three-phase servo motors. Correspondingly, one or a plurality of slave servo amplifiers are provided, and these master servo amplifiers and slave servo amplifiers have a plurality of output signals from a position detector provided in one of a plurality of multi-turn three-phase servo motors as feedback amounts. Since the feedback control for the multi-turn three-phase servo motor is performed, the plural multi-turn three-phase servo motors and the rotating part of the movable part driven by the plurality of multi-turn three-phase servo motors are connected by a belt or the like. This eliminates the need to reduce the cost of the electric molding machine and simplifies the configuration of the moving parts, increasing the degree of design freedom. It is possible. In addition, since a plurality of servo amplifiers are provided corresponding to each of the plurality of winding three-phase servo motors, it is possible to mount a plurality of winding three-phase servo motors with a large output, and to increase the size of the electric molding machine. it can.

  Hereinafter, an embodiment of a molding machine according to the present invention will be described with reference to FIGS. 1 to 5 by taking an injection molding machine as an example. 1 is a configuration diagram of an injection molding machine according to the embodiment, FIG. 2 is a configuration diagram of an injection apparatus according to the embodiment, and FIG. 3 is a diagram illustrating a winding structure of a double-winding three-phase servo motor according to the embodiment. 4 is a block diagram of the motor drive control device according to the embodiment, and FIG. 5 is a circuit diagram of the motor drive control device according to the embodiment.

  As shown in FIG. 1, the injection molding machine of this example includes an injection device 1, a mold clamping device 2, an extrusion device 3, and driving of each electric servo motor provided in each of these devices 1, 2, 3. A required number of servo amplifiers 5 for driving each electric servo motor provided in each of the devices 1, 2 and 3 based on a drive command signal output from the motion controller 4, A required number of inverters 6 connected to the output terminal of the servo amplifier 5 are provided.

  As shown in detail in FIG. 2, the injection device 1 includes a head stock 11 and a motor mounting plate 12 which are arranged on the base 7 to face each other with a predetermined interval, and a first mounted on the motor mounting plate 12. The second injection electric servomotors 13 and 14 and the first injection electric servomotor 13 and an encoder (position detector) 15 for detecting the rotation direction and the rotation amount of the first injection electric servomotor 13 are provided. And four connecting bars 16 spanned between the head stock 11 and the motor mounting plate 12, and a linear motion body that is guided by the connecting bar 16 and moves forward and backward between the head stock 11 and the motor mounting plate 12. 17, first and second ball screw mechanisms 18, 19 that convert the rotational motion of the first and second injection electric servomotors 13, 14 into the linear motion of the linear motion body 17, and the linear motion body 17. Servo motor 20 for metering, screw 21 having one end connected to servo motor 20 for metering, cylinder 22 for housing screw 21, injection nozzle 23 provided at the tip of cylinder 22, and cylinder 22 The hopper 24 is mainly composed of a raw material resin. The first and second ball screw mechanisms 18 and 19 are directly connected to the motor rotors of the first and second injection electric servomotors 13 and 14, respectively. 14 includes a screw shaft 25 that is rotationally driven by the screw 14, and a nut body 26 that is screwed to the screw shaft 25 and has one end fixed to the linear motion body 17. When the screw shafts 25 of the ball screw mechanisms 18 and 19 are directly connected to the motor rotors of the first and second injection electric servomotors 13 and 14 as described above, the injection electric servomotors 13 and 14 and the screws thereof are screwed together. Since the power transmission mechanism that connects the shaft 25 can be omitted, the injection device 1 and thus the molding machine can be reduced in size and cost.

  As the first and second injection electric servomotors 13 and 14, a multi-turn three-phase servomotor is used. This multi-winding three-phase servo motor is obtained by winding a plurality of U-phase, V-phase, and W-phase windings having a phase angle of 120 degrees with respect to each other. , V-phase and W-phase windings. FIG. 3 schematically shows the winding structure of a double-winding three-phase servomotor, which has windings U1, V1, W1 and windings U2, V2, W2.

  In the present embodiment, as the first and second injection electric servomotors 13 and 14, cylindrical motor housings 13a and 14a, and cylindrical motor stators housed in the motor housings 13a and 14a. 13b, 14b, motor coils 13c, 14c wound around the outer periphery of the motor stators 13b, 14b, cylindrical motor rotors 13d, 14d disposed rotatably in the motor stators 13b, 14b, A so-called built-in motor including motor magnets 13e and 14e attached to the outer surfaces of the motor rotors 13d and 14d is used. Since the built-in motor can arrange the screw shaft 25 as a driving member inside the motor rotors 13d and 14d, the configuration of the motor setting unit can be simplified, which is advantageous for downsizing of the injection molding machine. The gist of the present invention is not limited to the built-in motor, and other types of multi-turn three-phase servo motors can also be used.

  The molding machine according to the present embodiment is configured to advance the linear motion body 17 and the screw 21 by the driving force of the first and second injection electric servomotors 13 and 14, and the first and second injection electric motors. Since the screw shafts 25 of the ball screw mechanisms 18 and 19 are directly connected to the motor rotors of the servo motors 13 and 14, it is necessary to strictly control the drive thereof. In a large molding machine, it is necessary to increase the driving force of the first and second injection electric servomotors 13 and 14 in order to increase the injection speed and increase the injection pressure.

  For this reason, the molding machine according to the present embodiment, as shown in FIG. 4, for the first injection electric servomotor 13, a master servo having an input unit for the drive command signal S1 output from the motion controller 4. An amplifier 5A, a first inverter 6A connected to the output terminal of the master servo amplifier 5A, a first slave servo amplifier 5B having an input of a synchronization control signal S2 output from the master servo amplifier 5A, and a first slave servo And a second inverter 6B connected to the output terminal of the amplifier 5B. Further, for the second injection electric servo motor 14, the second slave servo amplifier 5C having an input portion for the synchronization control signal S2 output from the master servo amplifier 5A and the output terminals of the second slave servo amplifier 5C are provided. A third inverter 6C connected, a third slave servo amplifier 5D having an input of a synchronization control signal S2 output from the master servo amplifier 5A, and a fourth inverter connected to the output terminal of the third slave servo amplifier 5D 6D. In addition, the output signal S3 of the encoder 15 provided in the first injection electric servomotor 13 is input to the master servo amplifier 5A and the first to third slave servo amplifiers 5B to 5D, respectively.

  The master servo amplifier 5A and the first to third slave servo amplifiers 5B to 5D have the same configuration that operates with the same software, and are obtained from the first and second injection electric servomotors 13 and 14, respectively. The one having a control capability of half the maximum output to be used is used. If each servo amplifier 5A to 5D having a master / slave switching function is used, the parts can be shared, and the cost of the molding machine can be reduced.

  The first to fourth inverters 6A to 6D have the same configuration, and each includes a plurality of power transistors and diodes as shown in FIG. The first inverter 6A is connected to the windings U1, V1, and W1 of the first injection electric servomotor 13 that is a double-winding three-phase motor, and the second inverter 6B is connected to the first injection electric servomotor 13. Connected to windings U2, V2, W2. Similarly, although not shown, the third inverter 6C is connected to the windings U1, V1, W1 of the second injection electric servomotor 14 which is a double-winding three-phase motor, and the fourth inverter 6D The second injection electric servomotor 14 is connected to the windings U2, V2, W2. In addition, the code | symbols 8 and 9 in a figure have shown the current sensor, and each of these current sensors 8 and 9 is the motor drive current which flows into winding U1 and V1, and the motor drive current which flows into winding U2 and V2, respectively. And the detected value is output to the master servo amplifier 5A and the first slave servo amplifier 5B. The master servo amplifier 5A and the first slave servo amplifier 5B are based on the detection values of the current sensors 8 and 9 and the rotation speed and rotation amount of the first injection electric servomotor 13, and the first injection electric servo. The drive of the motor 13 is controlled. The driving of the second injection electric servomotor 14 is controlled in the same manner.

  In the injection apparatus 1 of this example, the master servo amplifier 5A and the first to third slave servo amplifiers 5B to 5D use the output signal S3 of one encoder 15 as a feedback amount, and the first and second electric servos for injection. Since the feedback control for the motors 13 and 14 is performed, the drive of the first injection electric servo motor 13 and the drive of the second injection electric servo motor 14 can be synchronized with high precision. 13 and 14 and the power transmission mechanism that connects the screw shaft 25 to each other can be omitted.

  As the measuring servo motor 20, it is not always necessary to use a multi-turn three-phase servo motor or a built-in motor, but if a multi-turn three-phase built-in motor is used, the motor for the molding machine can be shared. This is advantageous in reducing the cost of the injection molding machine.

  Hereinafter, the operation of the injection apparatus 1 according to the present embodiment will be described. When the measuring servo motor 20 is activated by a command from the motion controller 4, the screw 21 is driven to rotate integrally with the motor rotor, and the raw material resin is supplied from the hopper 24 into the cylinder 22. The raw material resin supplied into the cylinder 22 is plasticized and kneaded by a shearing force accompanying the rotation of the screw 21 and heat from a band heater (not shown) provided on the outer periphery of the cylinder 22, and sequentially toward the tip side of the cylinder 22. Be transported. As the amount of resin transferred to the tip side of the cylinder 22 increases, the back pressure acting on the screw 21 increases, so that the back pressure is detected by an appropriate sensor to be plasticized and kneaded. Resin can be weighed. When the motion controller 4 determines that the plasticized and kneaded resin has reached a predetermined amount, the motion controller 4 outputs a drive command signal to the master servo amplifier 5A, and the first and second injection electric servomotors 13 and 14 are output. Start up. Thereby, the screw shaft 25 of the ball screw mechanisms 18 and 19 is rotationally driven integrally with the motor rotors 13d and 14d, and the nut body 26 screwed to the screw shaft 25 and the linear motion body 17 fixed to the nut body 26 are provided. It advances and the plasticized and kneaded resin is injected from the injection nozzle 23 into the mold.

  In the above embodiment, the double-winding three-phase motor is used as the first and second injection electric servomotors 13 and 14, but the gist of the present invention is to use a multiple-winding three-phase motor. There are three-phase motors with more than three windings. In that case, the number of servo amplifiers 5 and inverters 6 corresponding to the number of windings of the three-phase motor are provided.

  Next, the mold clamping device 2 of the molding machine according to the embodiment will be described.

  As shown in FIG. 1, the mold clamping device 2 according to the embodiment includes a fixed die plate 31 and a tail stock 32 fixed on a base 7 of a molding machine so as to face each other at a predetermined interval. A plurality of tie bars 33 fixed to the plate 31 and the tail stock 32; a movable die plate 34 guided by the tie bars 33 to move back and forth between the fixed die plate 31 and the tail stock 32; and the tail stock 32 and the movable die A toggle link mechanism 35 for connecting the plate 34, a mold clamping electric servomotor 36 mounted on the tailstock 32, and a rotary movement of the mold clamping electric servomotor 36 is converted into a straight movement to form a toggle link mechanism 35. And a ball screw mechanism 37 for transmission. A fixed die 38 is mounted on the fixed die plate 31, and a movable die 39 is mounted on the movable die plate 34.

  The toggle link mechanism 35 has a B link 41 whose one end is rotatably connected to the tail stock 32, and one end is rotatably connected to the movable die plate 34, and the other end is the other link of the B link 41. A link 42 that is pin-coupled so as to rotate relative to the end side, a cross head 43 that receives the driving force of the mold clamping electric servo motor 36 via a ball screw mechanism 37, and one end that rotates to the cross head 43. It consists of a C link 44 that is movably pin-coupled and is pin-coupled so that the other end rotates relative to the intermediate portion of the B link 41. The toggle link mechanism 35 of this example is a link mechanism having a five-point pivot structure having an A link 42, a B link 41, and a C link 44, but the gist of the present invention is limited to this. However, it is of course possible to provide other types of toggle link mechanisms.

  In FIG. 1, only one mold clamping electric servo motor 36 and one ball screw mechanism 37 are displayed, but the first and second injection electric servo motors 13 and 14 and the first and second electric servo motors connected thereto are shown. Similar to the second ball screw mechanisms 18 and 19, two or more mold clamping electric servo motors 36 and ball screw mechanisms 37 are provided. In addition, any one of the plurality of mold clamping electric servo motors 36 includes an encoder for detecting rotation, and each mold clamping electric servo motor 36 has a number corresponding to the number of windings of the motor. A servo amplifier 5 and an inverter 6 are provided. In addition, the winding structure of the mold clamping electric servo motor 36, the connection structure between the mold clamping electric servo motor 36, the servo amplifier 5 and the inverter 6, the connection structure of the encoder to each servo amplifier 5, and the mold clamping electric servo Since the drive control method of the motor 36 is the same as that of the electric servomotors 13 and 14 for injection, the description thereof is omitted.

  Further, as the mold clamping electric servomotor 36, a built-in motor similar to the electric servomotors 13 and 14 for injection can be used. If it does in this way, since the motor for molding machines can be shared, cost reduction of a molding machine can be achieved.

  In the mold clamping apparatus 2 of this example, the master servo amplifier 5A and the first to third slave servo amplifiers 5B to 5D use the output signal of one encoder as a feedback amount to provide feedback to a plurality of mold clamping electric servo motors 36. Since the control is performed, the driving of the plurality of mold clamping electric servo motors 36 can be synchronized with high accuracy.

  Hereinafter, the operation of the mold clamping device 2 according to the present embodiment will be described. When the mold clamping electric servo motor 36 is driven and the cross head 43 is advanced toward the fixed die plate 31 via the ball screw mechanism 37, the A link 42 and the B link 41 extend in a straight line as shown in FIG. Thus, the movable die plate 43 advances to the fixed die plate 31 side, and the fixed side mold 38 and the movable side mold 39 are clamped. As a result, a required mold cavity 40 is formed between the fixed side mold 38 and the movable side mold 39, so that the molding material can be injected into the mold cavity 40 by the injection device 1. From this state, when the mold clamping electric servo motor 36 is driven and the cross head 43 is retracted to the tail stock 32 side via the ball screw mechanism 37, the A link 42 and the B link 41 are folded and the movable die is folded. The plate 43 is retracted toward the tail stock 32, and the fixed side mold 38 and the movable side mold 39 are opened. Thereby, it becomes possible to take out the molded product using the extrusion device 3 described later.

  Next, the extrusion device 3 of the molding machine according to the embodiment will be described.

  As shown in FIG. 1, the extrusion device 3 according to the embodiment includes an extrusion plate 51, a plurality of extrusion pins 52 implanted in the extrusion plate 51, and first and second driving sources of the extrusion plate 51. Electric servomotors 53 and 54 for extrusion, and first and second ball screw mechanisms for converting the rotational motions of the first and second electric servomotors 53 and 54 for extrusion into linear motion and transmitting them to the extrusion plate 51. 55, 56. The extrusion plate 51, the first and second extrusion electric servomotors 53 and 54, and the first and second ball screw mechanisms 55 and 56 are disposed on the back side of the movable die plate 34, and the extrusion pin 52 is a movable die. The plate 34 is disposed through the pin insertion hole 57 provided in the plate 34.

  As the first and second extrusion electric servomotors 53 and 54, a multi-turn three-phase motor is used as in the case of the first and second injection electric servomotors 13 and 14. One of the extrusion electric servomotors 53 and 54 is provided with an encoder for detecting rotation, and each of the extrusion electric servomotors 53 and 54 has a number of servos corresponding to the number of windings of the motor. An amplifier 5 and an inverter 6 are connected. In addition, the winding structure of the first and second extrusion electric servomotors 53 and 54, the connection structure between the first and second extrusion electric servomotors 53 and 54, the servo amplifier 5 and the inverter 6, and each servo amplifier The connection structure of the encoder to 5 and the drive control method of the first and second electric servomotors 53 and 54 for extrusion are the same as those of the electric servomotors 13 and 14 for injection, and the description thereof will be omitted.

  Further, as the first and second electric servomotors 53 and 54 for extrusion, built-in motors similar to the electric servomotors 13 and 14 for injection can be used. If it does in this way, since the motor for molding machines can be shared, cost reduction of a molding machine can be achieved.

  In the extrusion device 3 of this example, the master servo amplifier 5A and the first to third slave servo amplifiers 5B to 5D use the output signal of one encoder as a feedback amount, and the first and second electric servomotors for extrusion 53. , 54 is controlled, the drive of the first and second extrusion electric servomotors 53, 54 can be synchronized with high accuracy.

  Hereinafter, operation | movement of the extrusion apparatus 3 which concerns on this embodiment is demonstrated. After the mold is opened, the first and second extrusion electric servomotors 53 and 54 are driven, and the extrusion plate 51 and the extrusion pin 52 implanted in the first and second ball screw mechanisms 55 and 56 are provided. By advancing toward the fixed die plate 31 side, the molded product molded in the mold cavity 40 can be taken out.

  In the above embodiment, the injection device 1, the mold clamping device 2 and the extrusion device 3 are all provided with a plurality of multiple winding three-phase motors, but the gist of the present invention is not limited thereto. Any one of the injection device 1, the mold clamping device 2, and the extrusion device 3 may be provided with a plurality of multiple winding three-phase motors.

  In the above embodiment, each of the injection device 1, the mold clamping device 2, and the extrusion device 3 has a ball screw mechanism 18, 19, as a motion conversion mechanism that converts the rotational motion of the electric servo motor into the linear motion of the movable portion. 37, 55, and 56, the gist of the present invention is not limited to this. As shown in FIG. 6, the first arm 61 that is rotationally driven by the multi-turn three-phase servomotor 13 and one end Can be provided with a crank mechanism comprising a second arm 62 rotatably coupled to the first arm 61 and the other end rotatably coupled to the linear motion body 17.

It is a block diagram of the injection molding machine which concerns on embodiment. It is a block diagram of the injection device which concerns on embodiment. It is a figure which shows the winding structure of the double winding 3 phase servomotor which concerns on embodiment. It is a block diagram of the motor drive control device concerning an embodiment. It is a circuit diagram of the motor drive control device concerning an embodiment. It is a figure which shows the other example of the power conversion mechanism which concerns on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection device 2 Clamping device 3 Extrusion device 4 Motion controller 5A Master servo amplifier 5B-5D Slave servo amplifier 6A-6D Inverter 13,14 Electric servo motor for injection 15 Encoder (position detector)
17 Linear motion body 18, 19 Ball screw mechanism 36 Electric servo motor for mold clamping 43 Cross head (linear motion body)
51 Extrusion plate (linear motion body)
53,54 Electric servo motor for extrusion

Claims (3)

A plurality of multi-turn three-phase servomotors, a position detector provided in one of the plurality of multi-turn three-phase servomotors, a rotating unit driven to rotate by the multi-turn three-phase servomotor, and the rotating unit A plurality of motion conversion mechanisms each having a linear motion body that is moved forward and backward, and wherein the rotating portion is directly coupled to each of the plurality of multiple winding three-phase servo motors; a motion controller that instructs the operation of the linear motion body; A master servo amplifier that drives one of the plurality of multiple-turn three-phase servomotors based on a drive command signal output from the controller, and another multiple-turn 3 based on a synchronization control signal output from the master servo amplifier In a molding machine equipped with a slave servo amplifier that drives a phase servo motor,
One master servo amplifier and one to a plurality of slave servo amplifiers are provided corresponding to one of the plurality of multiple-turn three-phase servomotors, and each of the other multiple-turn three-phase servomotors. Comprising one or more slave servo amplifiers,
The molding machine, wherein the master servo amplifier and the slave servo amplifier perform feedback control on the plurality of three-turn servo motors using an output signal of the position detector as a feedback amount.   2. The molding according to claim 1, wherein a ball screw mechanism comprising a screw shaft that is rotationally driven by the multi-turn three-phase servomotor and a nut body that is screwed to the screw shaft is used as the motion conversion mechanism. Machine.   As the motion conversion mechanism, a first arm that is rotationally driven by the multi-turn three-phase servomotor, one end is rotatably coupled to the first arm, and the other end is rotatably coupled to the linear motion body. 2. The molding machine according to claim 1, wherein a crank mechanism including two arms is used.

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