JPH05243755A - Controller for driving servo motor - Google Patents

Abstract

PURPOSE:To perform size reduction and simplification of construction for a servo motor driving controller applicable to industrial robots, machine tools, etc. CONSTITUTION:A heat sink 11 is provided with fitting holes 11a for box inside installation, and three intelligent power modules 12-14 in which switching elements comprising an inverter and driving circuits for the elements are incorporated are fixed on the heat sink 11 and control signal wires thereof and a drive wire for a servo motor are formed on a printed board 16. Further three current detectors 17-19 are fixed on the board 16 and capacitors 26-28 for noise prevention are connected with the inverter power supply terminals of the modules 12-14 by means of tab terminals 20-25 on the parts mounting surface of the board 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive controller for a servo motor used in industrial robots, machine tools and the like.

[0002]

2. Description of the Related Art A conventional servomotor drive controller generally uses a power module (a module containing a switching element forming an inverter). Hereinafter, the configuration of a conventional servo motor drive control device in which control devices for three servo motors are integrated will be described with reference to FIGS. 4, 5, and 6.

FIG. 4 is a layout view of a conventional servo motor drive control device, FIG. 5 is a sectional view of the conventional servo motor drive control device, and FIG. 6 is a circuit of a conventional servo motor drive control device. It is a figure.

In FIG. 4, reference numeral 1 is a heat sink, and the heat sink 1 has first, second, third power modules 2, 3, 4 and first, second, and second power detection means for detecting currents of respective servo motors. The current detectors 5, 6 and 7 of 3 are fixed.

As shown in FIG. 5, a plastic frame 8 is fixed to the heat sink 1, and a first printed circuit board 9 and a second printed circuit board 10 are fixed to the plastic frame 8. On the first printed circuit board 9, the power lines of the first to third power modules 2 to 4 and the first to third power modules 2 to 4 are connected.
The power lines of the third current detectors 5 to 7 are formed.
On the other hand, the second printed circuit board 10 has
Signal lines of modules 2 to 4 and first to third current detectors 5
7 to 7 signal lines are formed, and the first to third signal lines are formed.
The drive circuits (not shown) of the switching elements that form the inverters of the power modules 2 to 4 are mounted. It should be noted that the plastic frame 8 has a mounting hole 8a used for installing the drive control device in the housing.
Is being processed.

[0006]

However, in the servo motor drive control device having the above-mentioned conventional structure,
The area of the printed circuit board 10 occupied by the drive circuit of the switching element that constitutes the inverter of the module is large, and if the printed circuit boards 9 and 10 are made one, the mounting area of the servo motor drive control device becomes large and the size can be reduced. There wasn't.

SUMMARY OF THE INVENTION The present invention solves the above problems, and an object of the present invention is to provide a drive control device for a servo motor, which can be downsized and its structure can be simplified.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a servomotor for n units (n is an integer of 2 or more).
Is a controller for driving a servo motor that is integrated with a controller, and a heat sink having a mounting hole for installing the drive controller inside a housing, and a switching element fixed to the heat sink and forming an inverter. N intelligent power modules including therein and a drive circuit of the switching element, a printed circuit board on which control signal lines of these intelligent power modules and power lines to the servomotor are formed, and the printed matter N current detectors for detecting the current of the servomotor fixed to the component mounting surface of the board, and power supply terminals of the inverters of the n intelligent power modules, which are arranged on the component mounting surface of the printed circuit board. Connected to the tab terminal and the noise prevention coil attached to the tab terminal. It is that a capacitor.

[0009]

With the above structure, since the intelligent power module incorporating the switching element forming the inverter and the drive circuit for the switching element is used, the size and the structure can be simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a servo motor drive control device according to an embodiment of the present invention, FIG. 2 is a plan view showing the arrangement of the servo motor drive control device, and FIG.
FIG. 3 is a circuit diagram of a drive control device for the servo motor.

In FIG. 2, 11 is a heat sink, which is a mounting hole used for installing the drive control device in the housing.
11a is processed and formed. In this heat sink 11,
Switching elements 12a, 13a, 14 forming an inverter
a (see FIG. 3) and switching element drive circuit 12
The first, second, and third intelligent power modules 12, 13, 14 including b, 13b, 14b are fixed.

As shown in FIG. 1, the heat sink 11 includes
One printed circuit board 16 is fixed via a spacer 15. The printed circuit board 16 has first, second and third current detectors 17, 18 and 19 for detecting the current of each servo motor fixed to its component mounting surface, and also has first to third parts.
The control signals of the intelligent power modules 12 to 14 and the first to third current detectors 17 to 19 and the power line to the servo motor are formed. Tab terminals on the positive and negative power terminals of the inverter of each intelligent power module 12-14
20 to 25 are connected, and these tab terminals 20 to 25 are arranged on the component mounting surface of the printed board 16. Then, noise preventing capacitors 26, 27, 28 are connected between the respective tab terminals 20, 21, 22, 23, 24, 25.

As in the above-mentioned structure, the conventional structure requires a plastic frame having a complicated shape to fix the printed circuit board, but in this embodiment, the printed circuit board 16 is supported only by the spacer. Therefore, it is possible to configure an inexpensive and simple structure drive servomotor control device.

Further, in the prior art, a plastic frame having a complicated shape was required, but in this embodiment, since the mounting hole 11a was formed directly in the heat sink 11, the plastic frame became unnecessary.

In addition, in the prior art, the current detector was fixed to the heat sink, so that a large area on the heat sink was required, but in the present embodiment, the current detectors 17 to 19 are arranged on the printed circuit board 16. By fixing the heat sink 11 to the component mounting surface, the area of the heat sink 11 can be reduced, and the drive controller can be downsized.

Further, in the prior art, 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 this embodiment, the switching elements 12a to 14a are required.
By using the intelligent power modules 12-14 having the built-in drive circuits 12b-14b, it is not necessary to separately provide a drive circuit for the switching element that constitutes the inverter, and one printed circuit board 16
In addition, it is possible to form a control signal and a power line to the servo motor, and it is possible to downsize the drive control device.

By using the tab terminals 20 to 25, which electrically connect all the power supply terminals of the inverters of the intelligent power modules 12 to 14, it is easy to support a model having a large current capacity.

[0018]

As described above, according to the present invention,
By using the intelligent power module that contains the switching element that constitutes the inverter and the drive circuit of the switching element, and by fixing the current detector to the component mounting surface of the printed circuit board,
It is possible to reduce the size of the control device for driving the servo motor and simplify the structure. Also, by using tab terminals that electrically connect all the power terminals of the intelligent power module inverter, it is easy to support models with large current capacity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a servo motor drive control device according to an embodiment of the present invention, in which FIG.
FIG. 3B is a sectional view taken along line A-A, and FIG. 2B is a sectional view taken along line B-B in FIG.

FIG. 2 is a plan view showing an arrangement state of a drive control device for the servo motor seen from the line C-C in FIG. 1.

FIG. 3 is a circuit diagram of a drive control device for the servo motor.

FIG. 4 is a plan view showing an arrangement state (a state in which the first and second printed circuit boards are removed) of a conventional servo motor drive control device.

FIG. 5 is a cross-sectional view of a conventional servomotor drive control device.

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

[Explanation of symbols]

 11 Heat sink 11a Mounting hole 12, 13, 14 Intelligent power module 12a-14a Switching element 12b-14b Drive circuit 15 Spacer 16 Printed circuit board 17, 18, 19 Current detector 20-25 Tab terminals 26, 27, 28 Capacitor

Claims (1)

[Claims] 1. A controller for driving a servo motor in which controllers for n servo motors (n is an integer of 2 or more) are integrated, and mounting holes for installing the drive controller in a housing are provided. N intelligent power modules, which have a processed heat sink, a switching element fixed to the heat sink, which constitutes an inverter, and a drive circuit for the switching element, and control signal lines of these intelligent power modules A printed circuit board on which a power line to the servo motor is formed, n current detectors for detecting the current of the servo motor fixed to the component mounting surface of the printed circuit board, and a component mounting surface of the printed circuit board. Tab ends arranged and connected to power terminals of the inverters of the n intelligent power modules A drive control device for a servo motor, comprising a child and a noise prevention capacitor attached to the tab terminal.