JPH1169879A - AC servo driver unit - Google Patents

Abstract

(57) Abstract: Provided is an AC servo driver unit suitable for use in any of three-phase and single-phase AC input. SOLUTION: A converter 3 for rectifying a three-phase AC voltage input and outputting a DC voltage, an inverter 5 for converting the DC voltage into an AC voltage and applying the same to an AC servomotor, a terminal P for supplying a DC voltage from the outside, A converter unit comprising a combination of an AC servo driver 12 having N and a converter 11 for rectifying a single-phase AC voltage input and outputting a DC voltage to terminals P and N of the AC servo driver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC servo driver, and more particularly to an AC servo driver unit which can be used for a three-phase or single-phase AC power supply.

[0002]

2. Description of the Related Art Conventionally, in an AC servo driver supporting 200 V, a rectifier can be designed to be smaller when a three-phase AC voltage is input than when a single-phase AC voltage is input. This is because three-phase AC voltage input is more than single-phase AC voltage input.
This is because the rectification characteristics are good and the capacitor for smoothing the rectified DC voltage can be reduced in size. Therefore, when designing an AC servo driver, a three-phase AC voltage input specification may be used in consideration of miniaturization.

[0003] However, in Europe and the like, since a 200 V power supply is supplied in a single phase, a three-phase AC input type AC servo driver cannot be used with normal specifications. When a three-phase input type AC servo driver is used with a single-phase input, there are problems such as poor rectification characteristics, insufficient output to the motor, and an increase in the ripple current of the DC voltage smoothing capacitor, resulting in deterioration. That's why.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an AC servo driver unit which is suitable for use in any of three-phase and single-phase AC inputs in view of the above-mentioned problems of the prior art.

[0005]

In order to solve the above-mentioned problems, an AC servo driver unit according to the present invention rectifies a three-phase AC voltage input and outputs a DC voltage, and converts the DC voltage into an AC voltage to convert the AC voltage into an AC voltage. An inverter applied to the servomotor, an AC servo driver having an input terminal for supplying a DC voltage from outside, and a converter unit for rectifying a single-phase AC voltage input and outputting a DC voltage to an input terminal of the AC servo driver. Consisting of a combination of
Thus, a DC voltage input terminal is provided in the three-phase AC input type AC servo driver, and the DC voltage output of the separately prepared single-phase input converter unit is input to the DC voltage input terminal of the AC servo driver, thereby achieving a simple operation. The use of the AC servo driver in the phase power supply can be facilitated.

Further, the AC servo driver unit of the present invention comprises a converter for rectifying a three-phase AC voltage input and outputting a DC voltage, an inverter for converting the DC voltage to an AC voltage and applying the same to an AC servomotor, An AC servo driver having a terminal for outputting to the outside, a DC voltage terminal for receiving a DC voltage from the AC servo driver, charging current limiting means for limiting a charging current from the DC voltage terminal to a capacitor, and a capacitor charging voltage And a capacitor unit having a means for bypassing the charging current limiting means by a detection output. Thus, a DC voltage output terminal is provided on the three-phase AC input type AC servo driver, a capacitor unit is connected to the DC voltage output terminal, and only two phases of the three-phase AC voltage input of the AC servo driver are input. Thus, the use of the AC servo driver in the single-phase power supply can be facilitated.

[0007] The AC servo driver unit of the present invention comprises:
According to the specifications of the power supply (single-phase, three-phase), it is characterized by using the AC servo driver alone (for three-phase) or combining and using the AC servo driver and the converter unit or capacitor unit (for single-phase).

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.
FIG. 3 is a configuration circuit diagram of a servo driver unit.

As shown in FIG. 1, a converter 3 rectifies three-phase AC voltage inputs R, S, and T and outputs a DC voltage. The DC voltage is converted to an AC voltage and applied to an AC servomotor. Inverter 5, an AC servo driver 12 having input terminals P and N for supplying a DC voltage from the outside, and rectifying a single-phase AC voltage input and outputting a DC voltage to the input terminals P and N of the AC servo driver. In combination with the converter 11 that performs the operation.

In this AC servo driver unit, when a three-phase AC voltage is input, the AC servo driver 12
Only a single unit is used, and a three-phase AC voltage is input from its input terminals R, S, and T to drive as usual.

When the power supply is a single-phase AC voltage, the converter unit 11 is used in combination with the AC servo driver 12. By inputting a single-phase AC voltage to the input terminals R and T of the converter unit 11 and connecting the DC voltage output terminals P and N to the DC voltage input terminals P and N of the AC servo driver 12, power is supplied to the AC servo driver 12. Can be supplied.

FIG. 2 shows a second embodiment of the present invention.
FIG. 3 is a configuration circuit diagram of a servo driver unit.

As shown in FIG. 1, a plurality of AC servo drivers 16 ₁ , 1
6 ₂ ... in parallel, converter unit 1
5, a plurality of AC servo drivers 16
₁ , 16 ₂ ... Can be connected.

FIG. 3 shows a third embodiment of the present invention.
FIG. 3 is a configuration circuit diagram of a servo driver unit.

As shown in FIG. 1, a converter 3 rectifies a three-phase AC voltage input and outputs a DC voltage.
3. An inverter 35 for converting the DC voltage to an AC voltage and applying the AC voltage to an AC servomotor, and an AC servo driver 3 having terminals P and N for outputting the DC voltage to the outside.
1, DC voltage terminals P and N for receiving a DC voltage from the AC servo driver, and a capacitor C from the DC voltage terminals.
And a voltage detecting unit 3 for detecting that the capacitor charging voltage has reached a predetermined voltage value.
7. Relay 3 to bypass the electric resistance by the detection output
6 in combination with a capacitor unit 32 having the same.

In this AC servo driver unit, the AC servo driver 31 is used alone and driven by inputting a three-phase AC voltage from the input terminals R, S and T as usual.

When the power supply is a single-phase AC voltage, the capacitor unit 32 is used in combination with the AC servo driver 31. By inputting a single-phase AC voltage to the input terminals R and T of the converter unit 11 and connecting the DC voltage output terminals P and N to the DC voltage input terminals P and N of the AC servo driver 12, power is supplied to the AC servo driver 12. Can be supplied.

A capacitor unit 32 is connected to the DC power supply terminals P and N of the AC servo driver 31.
Limit the charging current to the capacitor C. Voltage detector 37
Detects that the charging voltage of the capacitor C has reached a predetermined voltage value. When the charging voltage reaches the predetermined voltage value, the relay 36 for bypassing the charging current is turned on, and the limiting resistor R is short-circuited. Thereby, the smoothing capacitor 34
In addition to the above, a smoothing capacitor is added to the AC servo driver 31, so that the rectification characteristics are improved and the AC servo driver 31 can be used even during single-phase input.

[0020]

As described above, according to the present invention, 3
Phase-input AC servo driver can be used with a single-phase power supply. There is no need to design a 3-phase input AC servo driver or a single-phase input AC servo driver as compared with the conventional model, and the lineup of AC servo drivers is simple. become.

[Brief description of the drawings]

FIG. 1 is a configuration circuit diagram of an AC servo driver unit according to a first embodiment of the present invention;

FIG. 2 is a configuration circuit diagram of an AC servo driver unit according to a second embodiment of the present invention;

FIG. 3 is a configuration circuit diagram of an AC servo driver unit according to a third embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectifier 2, 4 Smoothing capacitor 3 Converter 5 Inverter 11 Converter unit 12 AC servo driver 15 Converter unit 16 AC servo driver 21 Rectifier 22, 24 Smoothing capacitor 23 Converter 25 Inverter 31 AC servo driver 32 Capacitor unit 33 Converter 34 Smoothing capacitor 35 Inverter 36 Relay 37 Voltage detector

Claims (3)

[Claims] 1. A converter that rectifies a three-phase AC voltage input and outputs a DC voltage, and converts the DC voltage into an AC voltage and
An AC servo driver having an inverter applied to a C servomotor and an input terminal for supplying a DC voltage from outside; and a converter unit for rectifying a single-phase AC voltage input and outputting a DC voltage to an input terminal of the AC servo driver. AC servo driver unit consisting of a combination of 2. An AC servo driver unit, wherein a plurality of AC servo drivers are connected in parallel to a DC voltage output terminal of the converter unit according to claim 1. 3. A converter that rectifies a three-phase AC voltage input and outputs a DC voltage, and converts the DC voltage into an AC voltage and
An AC servo driver having an inverter applied to the C servomotor, a terminal for outputting the DC voltage to the outside, a DC voltage terminal receiving the DC voltage from the AC servo driver, and charging the capacitor from the DC voltage terminal AC comprising a combination of charging current limiting means for limiting current, voltage detecting means for detecting that a capacitor charging voltage has reached a predetermined voltage value, and a capacitor unit having means for bypassing charging current limiting means by a detection output. Servo driver unit.