JPH0268909A - Inspection of rotary transformer - Google Patents

Abstract

PURPOSE:To perform continuity and polarity inspections simultaneously and contrive the high efficiency of an inspection and prevent an erroneous inspection by transmitting signals inputted from a rotary transformer for signal input to a transformer to be inspected, thereby discriminating output signals. CONSTITUTION:A rotary transformer to be inspected 8 has a plurality of channels and a rotary transformer for signal input 1 having the same number of channels that the rotary transformer 8 has is mounted. Coils 5 and 6 of each channel of the above transformer 1 are connected in parallel and coils 12 and 13 of each channel of the above transformer 8 are connected in series. Signals inputted from the transformer 1 are transmitted to the transformer 8 and then, output signals of the transformer 8 are discriminated to inspect the polarity and continuity of the coils 12 and 13 of the transformer 8. For example, the announcing circuit 17 of a buzzer and the like is connected to the terminal 15 of a terminal plate 14 in the transformer 8 through a switching circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for inspecting a rotary transformer used in a video tape recorder, a digital audio tape recorder, etc.

(Prior art) Conventional continuity and polarity tests for this type of rotary transformer include measuring direct current resistance and inductance using a measuring instrument;
Or by visual inspection.

(Problems to be Solved by the Invention) In the conventional measurement method using a measuring instrument, reading the numerical value and determining pass/fail is complicated, and in the visual polarity inspection, the coil attachment surface of the rotary transformer and the coil lead wire solder connection are difficult. The position of the terminal part is on the opposite side, and it is difficult to check the position of the solder connection terminal part while visually tracing the coil lead wire (in addition, continuity testing and polarity testing are separate processes). Therefore, there is a problem that the inspection time is long, and there is a risk of misidentification due to the complexity, especially in multi-channel transformers.

The present invention has been made in view of the above-mentioned problems, and provides a rotary transformer testing method that can simultaneously perform a continuity test and a polarity test of a rotary transformer, improve testing efficiency, and prevent testing errors. .

[Structure of the invention]

(Problems to be Solved by the Invention) The rotary transformer inspection method of the present invention includes a signal input rotary transformer having the same number of channels as the rotary transformer to be inspected having a plurality of channels, and the signal input rotary transformer has a plurality of channels. The coils of each channel of the transformer are connected in parallel, and the coils of each channel of the rotary transformer to be tested are connected in series, and the signal input from the signal input 〇-tally transformer is transmitted to the rotary transformer to be tested. The present invention is characterized in that the output signal of the rotary transformer to be tested is identified and the polarity and continuity of the coil of the rotary transformer to be tested are tested.

(Function) In the rotary transformer inspection method of the present invention, a signal input rotary transformer and a rotary transformer to be inspected form a circuit for transmitting signals, and after setting this state,
A signal is input from the oscillator to the coil of the signal input rotary transformer, and the signal is transmitted from the signal input rotary transformer to the rotary transformer to be tested. In other words, a signal is transmitted from the coil of the signal input rotary transformer to each corresponding coil of the rotary transformer under test, an output is generated in the coil of the rotary transformer under test, and this signal output is used to control the coil of the rotary transformer under test. Determine polarity and continuity.

(Example) Next, a method according to an embodiment of the present invention will be explained.

Reference numeral 1 denotes a rotary transformer for signal input, which includes an annular ferrite core 2 and a concentric annular groove 3 formed on one surface of the ferrite core 2 to match the number of channels.
It consists of a coil 5° and 6 windings. And the coil 5.6 of this signal input rotary transformer 1
are connected in parallel, and this coil 5.6 is connected to the output of the oscillator 7.

8 is a rotary transformer to be inspected, which includes a ferrite core 9 and a coil 12.13 wound around a concentric annular groove 10.11 formed on one surface of the ferrite core 9.
A terminal plate 14 is provided on the other surface of the rotary transformer 8 to be inspected, and the coils 12 and 13 of the rotary transformer 8 to be inspected are connected in series via the terminal plate 14.

A switching circuit 16 is connected to the terminal 15 of the terminal plate 14 of the 0-tally transformer 8 to be inspected. A notification circuit 17 such as a buzzer is connected to the output terminal of the switching circuit 16, and the notification circuit 11 is set to operate when a signal input of a certain level or higher is input from the switching circuit 16.

For inspection, the coils 12 and 13 of the rotary transformer to be inspected 8 are wound around the surface of the rotary transformer 1 for signal input where the coils 5 and 6 are wound, and the coils 12 and 13 of the rotary transformer 8 to be inspected are placed opposite to each other with an appropriate gap. The transformer 1 and the rotary transformer 8 to be tested form a circuit for transmitting signals.

After this state is set, when a signal is input from the oscillator 7 to the coil 5.6 of the signal input rotary transformer 1, the signal is transmitted from the signal input rotary transformer 1 to the rotary transformer 8 to be inspected. That is,
Signals are transmitted from the coil 5 of the rotary transformer 1 for signal input to the coil 12 of the rotary transformer 8 to be tested, and from the coil 6 of the rotary transformer 1 for signal input to the coil 13 of the rotary transformer 8 to be tested. An output EO1 is generated in the coil 12, and an output EO2 is generated in the coil 13, and the turns ratio of the coil 5.6 of the signal input rotary transformer 1 and the coil 12.13 of the rotary transformer 8 to be inspected is constant, and EO1 is generated.
=EO2 roars.

And the coils 12 and 13 of the rotary transformer 8 to be inspected
are connected in series, and under normal conditions, the output EO1 and the output EO2 have the same phase, and the combined output becomes EO=EO1+EO2=2EO1.

When this combined output Eo=2EO1 is applied to the switching circuit 16, the switching circuit 16 operates, causing the notification circuit 17 to operate, and the notification circuit 17 performs a notification operation.

In addition, if there is an error in polarity, for example, if the coil 12 of the rotary transformer 8 to be inspected has a polarity opposite to normal, the combined output EO will be E O = E 01 - E 02 =
0, which is below the switching level at which the switching circuit 16 operates, so the switching circuit 16 is not operated, and therefore the notification circuit 17 is also not operated.

In addition, if a disconnection occurs in either one of the coils 12 or 13 of the rotary transformer 8 to be inspected, the combined output E
0 becomes EO=0, and the notification circuit 17 is similarly not operated.

In this way, the coil 12 of the rotary transformer 8 to be inspected.
13 is normal, the notification circuit 17 is not operated and it is possible to easily determine whether the rotary transformer 8 to be inspected passes or fails.

In the above embodiment, the notification circuit 17 is activated when the polarity of the rotary transformer 8 to be inspected is normal, but the notification circuit 17 may be activated when an abnormality occurs.

Next, a method for a multi-channel, eg, 6-channel type embodiment will be described with reference to FIG.

The coils 21.22.23.24.25.26 of each channel of the rotary transformer 20 for signal input are the first and second coils 21.22, and the third and fourth coils 23.
, 24, the fifth and sixth coils 25, 26 are connected in parallel, respectively, and the first and second coils 21, 2
The input terminal of the second coil 23.24 is connected to the output terminal of the first oscillator 27, and the input terminal of the fourth coil 23.24 is connected to the output terminal of the second oscillator 28.
The input ends of the fifth and sixth coils 25,26 are connected to the output end of the third oscillator 29, respectively.

Further, the coils 31, 32, 33, 34, 35, 36 of each channel of the rotary transformer 30 to be inspected are connected in series via a terminal board.

The rotary transformer 30 to be inspected corresponds to the first and second coils 21.22, the third and fourth coils 23.24, and the fifth and sixth coils 25.26 of the signal input rotary transformer 20, respectively. The first and second coils 31, 32, the third and fourth coils 3
3.34, one of each of the fifth and sixth coils 35, 36, e.g. the second, fourth and sixth coils 32
．． 34 and 36 are connected in series with opposite polarity.

Further, an oscilloscope 37 is connected to the output end of the terminal board of the rotary transformer 30 to be inspected.

Next, the operation of this embodiment will be explained.

The rotary transformer 30 to be inspected is opposed to the rotary transformer 20 for signal input to form a circuit for transmitting signals, and the first oscillator 27 is connected to the first and second coils 21 and 22 of the rotary transformer 20 for signal input. frequency f1
When an input signal of An output of EO2 is generated. Further, the third t'3 and fourth coil 23 of the rotary transformer 20 for signal input from the second oscillator 28
．． 24, the signal is transmitted from the signal input rotary transformer 20 to the third and fourth coils 33, 34 of the rotary transformer 30 to be inspected. 4 coil 3
4, the output of EO4 is generated. Furthermore, the third oscillator 2
9 to the fifth and sixth coils 25 and 26 of the rotary transformer 20 for signal input, the input signal of frequency f3 is input from the rotary transformer 20 for signal input to the fifth and sixth coils 35 of the rotary transformer 30 to be inspected.
．． The signal is transmitted to the fifth coil 35, and the signal is transmitted to the fifth coil 35.
, an output of EO6 is generated in the sixth coil 3B. Then, each coil 21, 22, 23, 24, 25, 26 of the rotary transformer 20 for signal input and each coil 31, 32, 33, 34, 35, 3 of the rotary transformer 30 to be inspected.
Since the number of turns of 6 is constant, EO1=EO2, E 03
= E 04, EO5=EO6.

During normal operation, the first rotary transformer 30 to be inspected is
and the output EO1 and output EO of the second coil 31.32
2 is a signal of frequency f1, one of which has the opposite polarity, and the combined output Eft of the first and second coils 31 and 32 becomes E f1 = E Ol - E 02 = 0, and similarly The output EO3 and the output EO4 of the third and fourth coils 33 and 34 are at the frequency f2.
One of the signals has opposite polarity, and the combined output Ef2 of the third and fourth coils 33, 34 is E T2 = E 03-
E 04-0, and the output EO of the fifth and sixth coils 35 and 36 of the rotary transformer 30 to be inspected.
5 and the output EO6 are signals of frequency f3, one of which has opposite polarity, and the combined output E of the fifth and sixth coils 35 and 36.
f3 becomes E f3 = E 05 - E 06 = 0.

Therefore, the total output of the rotary transformer 30 to be inspected is EO
becomes E O = E f1 + E f2 + E f3 = 0.

Therefore, the waveform on the oscilloscope 37 is displayed as a horizontal line.

Furthermore, if the polarity of the rotary transformer 30 to be inspected is incorrect, for example, the polarity of the second coil 32 is opposite to normal, the combined output Ef1 of the first and second coils 31.32 will be Ef1=EO1+EO2=2EO1, and the oscilloscope As for the waveform on 31, the signal waveform of frequency f1 is displayed in a large size.

In addition, each coil 31, 3 of the rotary transformer 30 to be inspected
2.33.34.35.36, if one coil is disconnected, the input circuit of the oscilloscope 37 will open,
The induced noise greatly disturbs the oscilloscope 370 waveform.

In this way, by monitoring the waveform with the oscilloscope 37, it is possible to easily determine whether the rotary transformer 30 to be inspected is acceptable or not.

In the explanation of the above embodiment, the input signals of the oscillators 27, 28, 29 are fl, f2. f3 is the composite output E
This is to facilitate the determination of the O waveform.

Next, the method of Haku's embodiment will be explained with reference to FIG.

The coils 5 and 6 of each channel of the signal input rotary transformer 1 are connected in parallel, and the input terminals of the coils 5 and 6 are connected to the output terminal of the oscillator 7.

And the coil 5 of this signal input rotary transformer 1
．． The coils 12 and 13 of the rotary transformer 8 to be inspected corresponding to 6 are connected in series with mutually opposite polarities.

Also, one output end of the terminal board of the 0-tally transformer 8 to be inspected is connected to the oscilloscope 31 via a DC blocking capacitor 38, and the other output end is connected to an alarm circuit 17 such as a buzzer via the switching circuit 1G. has been done.

In the figure, 39 is a DC power supply, 40.41 is a voltage dividing resistor, and 42
is a bypass capacitor.

In the method of this embodiment, the continuity of the coils 12 and 13 of the rotary transformer 8 to be inspected can be detected by the notification circuit 17 with the same effect as in the previous embodiment, and the oscilloscope 37
The polarity pass/fail can be detected from the waveform displayed.

Furthermore, the inspection determination in each of the above embodiments is not limited to the sound generated by the notification circuit 17 such as a buzzer or the waveform monitoring of the oscilloscope 37, but may be performed by various means such as blinking a lamp or measuring the output signal with a voltmeter. be able to.

(Effects of the Invention) According to the present invention, the polarity and conduction state of the coil of the 0-tally transformer to be tested can be easily determined by simply using a signal input rotary transformer having the same number of channels as the rotary transformer to be tested. It is possible to perform inspection and judgment, and also to simultaneously inspect the polarity and conduction state, and it is possible to improve the quality and reduce the cost by significantly shortening the inspection time in manufacturing rotary transformers.

[Brief explanation of the drawing]

FIG. 1 is a front view of a 0-tally transformer to be inspected by the rotary transformer inspection method of the present invention, FIG. 2 is a front view of a signal input 0-tally transformer used in the rotary transformer inspection method of the present invention, and FIG. The figure is an explanatory diagram showing one embodiment of the rotary transformer inspection method of the present invention, FIG. 4 is a circuit diagram of the same as above, and Amushima 5 and 6 are respectively seven examples of the rotary transformer inspection method of the present invention. FIG. 2 is a circuit diagram showing an example. 1.20...Rotary transformer for signal input, 5, 6
, 21.22.23.24.25.26... Coil of rotary transformer for signal input, 8.30... Rotary transformer to be inspected, 12.13.31.32.34.3
5゜36... Coil of the rotary transformer to be inspected.

Claims (1)

[Claims] (1) A rotary transformer for signal input having the same number of channels as the rotary transformer to be tested which has a plurality of channels, the coils of each channel of the rotary transformer for signal input being connected in parallel, and the rotary transformer to be tested has a plurality of channels. The coils of each channel are connected in series, the signal input from the signal input rotary transformer is transmitted to the rotary transformer to be tested, the output signal of the rotary transformer to be tested is identified, and the coil of the rotary transformer to be tested is identified. A rotary transformer inspection method characterized by inspecting the polarity and continuity of the rotary transformer.