JPH07123732A - Drive controller for servomotor - Google Patents

Abstract

PURPOSE:To reduce the size and simplify the structure of a drive controller which drives a servomotor in accordance with commands from a numerical controller, etc., as compared with the conventional example by using intelligent power modules for the controller. CONSTITUTION:The conducting path of a bridge diode module 3 for power supply, control signal path and conducting path of a intelligent power module 4 for regenerating power, control signal paths of two intelligent power modules 5 and 6 for inverter, and power line to a servomotor are formed on a printed board 7. In addition, current detectors 8-11, an electrolytic capacitor for power supply to the inverter, and noise preventing capacitors 13 and 14 connected to the power source of the inverter are fixed on the parts mounting surface of the board 7. Since the intelligent power modules are used, the control signal lines and power line to the servomotor can be formed on the surface of one printed board 7 and the size of this controller can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a servo motor used in machine tools, industrial robots, etc., and particularly, it uses an intelligent power module for downsizing and simplification of structure. And a controller for driving a servo motor.

[0002]

2. Description of the Related Art A conventional servo motor drive control device generally uses a power module (a module containing a switching element forming an inverter). The configuration will be described below with reference to FIGS.
Will be described with reference to. FIG. 4 is a layout view of a conventional servo motor drive control device, FIG. 5 is a sectional view of FIG. 4, and FIG. 6 is a circuit diagram of a conventional servo motor drive control device.

In FIG. 4, 20 is a heat sink, and 21
Is a first power module fixed to the heat sink 20, 22 is a second power module fixed to the heat sink 20, and 23 is a bridge for power supply of the inverter.
Diode module, 24 is a regenerative discharge resistor, 2
5 is a plastic frame for fixing the heat sink 20 and the regenerative discharge resistor 24, and 26 is a mounting hole used for installing the drive control device of the servo motor in the housing.

In FIG. 5, reference numeral 27 denotes a first conductive path of the power supply bridge diode module 23 and a first power line to the servomotor of the first power module 21 and the second power module 22. Printed circuit boards, 2
Reference numerals 8 to 31 denote current detectors for detecting the current of the servo motor fixed to the component mounting surface of the first printed board 27, and 32.
Is an electrolytic capacitor for power supply of the inverter fixed to the component mounting surface of the first printed board 27, and 33 and 34 are noise prevention connected to the power supply of the inverter fixed to the component mounting surface of the first printed board 27, respectively. Capacitors for
35 is the first power module 21 and the second power module 21
It is the second printed circuit board on which the signal lines of the module 22 and the current detectors 28 to 31 are formed. A first printed circuit board 27 and a second printed circuit board 35 are fixed to the plastic frame 25, and a mounting hole 26 used for installing the drive control device in the housing is processed. Also, the first and second power modules 2
As shown in FIG. 6, the drive circuits for driving the switching elements forming the inverter are not built in the reference numerals 1 and 22, and the drive circuits are mounted on the second printed circuit board 35.

[0005]

In the above-mentioned conventional example, the area on the printed circuit board occupied by the drive circuit for driving the switching elements constituting the inverter of the power module is large, and if one printed circuit board is used, The installation area of the servo motor drive control device was large, and it was not possible to reduce the size. Further, a regenerative discharge resistor having a large wattage is required to suppress the temperature rise of the drive control device.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and particularly provides a drive control device for a servo motor which uses an intelligent power module to reduce the size and simplify the structure. That is the purpose.

[0007]

In order to achieve the above object, the present invention provides a drive control device for driving a servo motor according to a command from a numerical control device or the like, for installing the drive control device for the servo motor in a housing. , A bridge diode module for the power supply of the inverter fixed to the heat sink, an intelligent power module for power regeneration fixed to the heat sink (a switching element and its A module containing a drive circuit of a switching element), intelligent power modules for a plurality of inverters fixed to the heat sink, conductive paths of the bridge diode module for power supply, and the intelligent power module for power regeneration of Of the control signal line, the conductive path, the control signal line of the intelligent power modules for the plurality of inverters, and the power line to the servo motor, and the servo motor fixed to the component mounting surface of the printed circuit board. A current detector for detecting a current, an electrolytic capacitor for power supply of the inverter fixed to the component mounting surface of the printed circuit board, and a noise prevention connected to the power supply of the inverter fixed to the component mounting surface of the printed circuit board. And a capacitor.

[0008]

With the above configuration, the use of the intelligent power module having the switching element and the drive circuit of the switching element which form the inverter makes it possible to eliminate the area occupied by the drive circuit on the printed circuit board. Even if there is only one board, the control signal line and the power line to the servo motor can be formed at the same time, which facilitates miniaturization. Further, in order to fix the printed circuit board, it is not necessary to use a plastic frame having a complicated shape as in the conventional case, and it is possible to configure with only a spacer having a simple structure, which can be inexpensive. Further, the regenerative discharge resistor is unnecessary, and the temperature rise of the drive control device can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of one embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS.

FIG. 1 is a layout view of a servo motor drive controller according to the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a circuit diagram of the servo motor drive controller of the present invention.

In FIG. 1, reference numeral 1 denotes a mounting hole 2 used for installing a drive control device for a servo motor in a housing.
Is processed into a heat sink, 3 is a bridge diode module for inverter power supply fixed to the heat sink 1, and 4 is an intelligent power module for power regeneration fixed to the heat sink 1 (as shown in FIG. Modules with built-in switching elements and drive circuits for the switching elements), 5
Is a first intelligent power module for an inverter fixed to the heat sink 1 (a module including a switching element forming a bridge and a drive circuit for the switching element as shown in FIG. 3), 6
Is an intelligent power module for the second inverter fixed to the heat sink 1.

In FIG. 2, reference numeral 7 is a conductive path of the power supply bridge diode module 3, a control signal line of the intelligent power module 4 for power regeneration, a conductive path, and two intelligent power modules 5 for inverters. A printed circuit board on which a control signal line 6 and a power line to the servo motor are formed, 8 to 11 are current detectors for detecting the current of the servo motor fixed to the component mounting surface of the printed circuit board 7, and 12 is the printed circuit board 7. The electrolytic capacitors for power supply of the inverter fixed to the component mounting surface, 13 and 14 are respectively capacitors for preventing noise connected to the power supply of the inverter fixed to the component mounting surface of the printed circuit board 7, and 15 is the printed circuit board 7. Is a spacer for fixing to the heat sink 1.

As described above, conventionally, a plastic frame having a complicated shape was required to fix the printed circuit board, but in the present invention, it is inexpensive and can be constituted only by a spacer having a simple structure. Further, in the conventional example, a plastic frame having a complicated shape is required to secure the mounting hole used for installing the drive control device in the housing, but in the present invention, the drive control device is attached to the heat sink. By machining the mounting holes used for installation inside the enclosure, the plastic frame became unnecessary.

Further, in the conventional example, a large area on the printed circuit board occupied by the drive circuit of the switching element constituting the inverter of the power module was required, but in the present invention, the intelligent power module is used. It becomes unnecessary to mount the drive circuit of the switching element forming the inverter on the printed circuit board, and the control signal line and the power line to the servo motor can be formed with one printed circuit board, and the size can be reduced.

Further, since the regenerative discharge resistor is unnecessary, the temperature rise of the drive control device can be reduced.

[0016]

As described above, according to the present invention, the intelligent power module is used in the drive control device for driving the servo motor according to the command from the numerical control device or the like, so that the size and structure are smaller than the conventional one. It has an excellent effect that simplification can be achieved.

[Brief description of drawings]

FIG. 1 is a layout view of a servo motor drive control device according to an embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a circuit diagram of a servo motor drive controller according to an embodiment of the present invention.

FIG. 4 is a layout diagram of a servo motor drive control device in a conventional example.

5 is a sectional view of FIG.

FIG. 6 is a circuit diagram of a servo motor drive control device in a conventional example.

[Explanation of symbols]

1 heat sink 2 mounting hole 3 bridge power supply diode diode module for inverter 4 intelligent power module for power regeneration 5 intelligent power module for first inverter 6 intelligent power module for second inverter 7 printed circuit board 8 -11 Current detector 12 Electrolytic capacitor for inverter power supply 13, 14 Noise prevention capacitor 15 Spacer

Claims (1)

[Claims] 1. A heat sink having a mounting hole for mounting a drive control device for a servo motor in a housing, a bridge diode module for an inverter power source fixed to the heat sink, and a heat sink fixed to the heat sink. Intelligent power for power regeneration
A module and intelligent power modules for a plurality of inverters fixed to the heat sink,
Conductive path of the bridge diode module for power supply, control signal line and conductive path of the intelligent power module for power regeneration, control signal line of intelligent power modules for the plurality of inverters, and power line to servomotor A printed circuit board formed with, a current detector for detecting the current of the servomotor fixed to the component mounting surface of the printed circuit board, an electrolytic capacitor for the power supply of the inverter fixed to the component mounting surface of the printed circuit board, A controller for driving a servo motor, comprising: a noise-preventing capacitor connected to a power source of an inverter fixed to a component mounting surface of the printed circuit board.