JPH03251731A - Positioning device of unbalance - Google Patents

Abstract

PURPOSE:To reduce the rate of occurrence of a fault by using a three-phase induction motor for a drive source which rotates a test body when the unbalance of the test body is positioned, and by driving it at a low speed enabling execution of positioning while detecting a rotational position. CONSTITUTION:Switches S1 and S2 being turned ON, a high-speed DC output is inputted to an inverter 5 and thereby a three-phase induction motor is rotated at a high speed to execute measurement of unbalance. When the measurement is ended, the switch S2 is turned OFF with the switch S2 left ON, and a switch S3 is turned ON. Thereby the motor is rotated at a low speed and positioning is made so that the position of unbalance of a test body 1 comes to a position 12 of modification by a modifying device such as a drill. When phase detection by a control circuit 9 turns to show zero on the occasion, a positioning completion signal is outputted, the switches S1 and S3 are turned OFF, a brake 6 is driven by a switch S4 being turned ON, and thereby the motor 2 is braked. According to this constitution, a circuit construction is simplified and wirings are lessened in comparison with the case wherein a servomotor is used, and the rate of occurrence of a fault can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an unbalance positioning method for positioning a rotating body to an unbalanced position when correcting an unbalance of a rotating body, etc. measured in a dynamic balance test. Regarding equipment.

[Prior art] A device that positions the unbalanced position of a rotating body whose unbalance has been measured in a dynamic balance test to a corrected position uses a servo motor as a drive source, and sends a positioning signal to the servo. Positioning is performed manually by controlling the rotation angle.

[Problems to be Solved by the Invention] When a servo motor is used as a positioning means, there is a problem that the drive circuit of the servo motor is complicated and requires many wirings, and the rate of failure is high. Another problem was that the servo motor itself was expensive and the manufacturing cost was high.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

That is, the unbalanced positioning device according to the present invention has the following features:
An unbalance positioning device that positions an unbalanced position of a test object measured by an unbalance measuring means to a predetermined correction position, the device includes a DC power source with a variable output voltage, and a DC input voltage that changes the output voltage of the DC power source. an inverter that converts the current into variable frequency three-phase alternating current; a three-phase induction motor that is driven by the output of the inverter and serves as a drive source for rotating the test specimen; and an encoder that detects the rotation angle of the three-phase induction motor. The controller includes a controller that determines that the unbalanced position of the test object has been positioned at the corrected position based on the output signal of the encoder, and outputs a positioning completion signal to turn off the power supply to the inverter of the DC power source. It is characterized by

[Operation] A three-phase induction motor operated at low speed by three-phase alternating current supplied by an inverter drives the unbalance positioning device of the test specimen. The rotation angle of this three-phase induction motor is detected by an encoder, and a signal is output when positioning is completed to stop the motor.

[Example] Fig. 1 is a block diagram showing the configuration of an unbalance positioning device that is an example of the present invention. It is rotated using the induction motor 2 as a driving source, and unbalance measurement and positioning to a correcting position of the unbalance position are performed. The three-phase induction motor 2 is driven by an inverter 5 as a variable frequency, variable voltage source, which converts the high-speed DC output and low-speed DC output output from the servo amplifier 3 provided on the DC power supply side into three-phase AC at an arbitrary frequency. be done.

A connection circuit that supplies DC power from the servo amplifier 3 to the inverter 5 is provided with a main switch Sl and changeover switches S2 and S3 that switch between high-speed DC output and low-speed output. The three-phase induction motor 2 is also provided with a brake 6 that is driven by a separate AC power source, and a switch S4 is provided in the power supply connection path of the brake, and the brake is activated by turning on the switch S4. It operates to brake the motor 2. These switches S1, S2, Ss
, S4 are opened and closed by command signals from a control circuit 9, which will be described later.

The three-phase induction motor 2 is further provided with an encoder 8 to detect the rotational position of the motor. The rotational position detection signal from the encoder is sent to the unbalance measurement circuit 1 of the testing machine main body.
It is input to the control circuit 9 together with the unbalance position detection signal from 0, and the phase difference between the two is detected.

In the device configured as described above, the switch Sl,
Unbalance measurement is performed by turning on S2 and inputting a high-speed DC output to the inverter 5 to rotate the three-phase induction motor at high speed. When the measurement is completed, leave switch S on, turn off switch S2, and turn on switch S3.
The specimen 1 is rotated at a low speed and positioned so that the unbalanced position of the test specimen 1 comes to a correction position 12 using a correction means such as a drill.

When the phase difference detected by the control circuit 9 becomes zero, a positioning completion signal is output, and the main switch S is activated.

and changeover switch S3 is turned off,
Switch S4 is turned on, brake 6 is driven,
A brake is applied to the three-phase induction motor 2.

As described above, the apparatus according to the embodiment of the present invention uses a three-phase induction motor as the drive source for rotating the test object during unbalance positioning of the test object, and drives the test object at a low speed that allows positioning while detecting the rotational position. It is configured like this, so
Compared to the case of using a servo motor, the circuit configuration is simpler and requires less wiring, and the failure rate can be reduced.

Further, since the device can be constructed without using an expensive servo motor, the manufacturing cost of the device can be reduced.

[Effects of the Invention] As is clear from the above description, according to the unbalanced positioning device according to the present invention, the circuit configuration of the drive source is simplified and the number of connected wirings is reduced, so that the failure rate due to poor connections etc. is reduced. It has become possible to reduce the amount of carbon dioxide, and it has also become possible to manufacture it at a low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1... Test object 2... Three-phase induction motor 3 ・
...Servo amplifier (DC power supply) 5-...Inverter 8...Encoder 9...Control circuit S1~
S4...Switch

Claims (1)

[Claims] (1) An unbalance positioning device that positions the unbalanced position of a test specimen measured by an unbalance measuring means to a predetermined correction position, which includes a DC power source with a variable output voltage and a variable output voltage. an inverter that converts DC input voltage into variable frequency three-phase AC;
A three-phase induction motor is driven by the output of the inverter and serves as a drive source for rotating the test object, an encoder detects the rotation angle of the three-phase induction motor, and an unbalanced position of the test object is determined by the output signal of the encoder. It determines that it has been positioned at the corrected position, outputs a positioning completion signal, and turns off the power supply to the inverter of the DC power supply.
An unbalance positioning device characterized by comprising: a controller for controlling F.