JPS62119411A - Signal detector for coil - Google Patents

Abstract

PURPOSE:To maintain a contact reliability, by making an electrical signal for preventing poor contact overlap on a signal from a coil for a contactor connected to a coil to allow defective conduction due to insulating material attached to the connector to be neglected. CONSTITUTION:As a magnet 1 turns, a signal current generated by a coil 2 is inputted into a signal input unit 4 and the rotation of the magnet is detected. At this point, a current in which the said signal current is combined with a current run from a voltage source 6 flows through a connector 3. Therefore, even when the current induced in the coil 2 is small, a relatively large amount of current flows to the connector 3. This can help avoid the effect due to any defective conduction caused by the attachment of insulating object in the connector 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal detection device for a coil, and particularly to a signal detection device for a coil used in a near conditioner or the like.

[Conventional technology]

FIG. 2 shows a conventional coil signal detection device.

Such a signal detection device is, for example, disclosed in Japanese Patent Publication No. 58-1804.
It is used as a compressor rotation speed detection device as seen in Publication No. 2. Specifically, a signal detection device of this type is used to detect the rotation of a magnet 1, and for this purpose it comprises a coil 2 positioned to be magnetically coupled to the magnet 1; It has connectors 3 connected to both ends of this coil 2. Furthermore, a signal input device (
For example, a device that converts a minute signal into a signal of 1 or 0. ) 4 is attached to the connector 3 so as to be connectable and disconnectable, and a resistor 5 is connected in parallel to the signal input device 4.

In this configuration, when the magnet 1 rotates, a change is caused in the magnetic flux by the magnet 1, and an induced electromotive force is generated in the coil 2 due to the change in the magnetic flux.

The induced current generated by the induced electromotive force becomes a signal current that causes the rotation of the magnet 1, and is transmitted from the coil 2 via the connector 3 to the signal input device 4, where it is detected.

[Problem that the invention seeks to solve]

However, due to adhesion of insulating material etc., connector 3 and coil 2
If the contact between the coil 2 and the coil 2 becomes poor, it becomes difficult for the signal current from the coil 2 to flow to the signal input device 4. In particular, poor contact is likely to occur when the signal current is small. As a result of poor contact,
An error occurs between the signal current and the rotation of the magnet, and the rotation of the magnet? Accurate detection becomes impossible.

Also.

It is usually difficult to detect poor contact in connectors.

[Means for solving problems]

The coil signal detection device of the present invention includes a coil having a pair of terminals, a connector connected to the pair of terminals, and a connector connected to and disconnectable from the coil, and detects a signal from the coil. In the coil signal detection device having a signal input device, the coil signal detection device includes a power source for applying all contact failure prevention electric signals to the connector so as to be superimposed on the signal from the coil.

Remaining days below 〔Example〕 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the coil signal detection device of the present invention, which, like the conventional signal detection device shown in FIG. used in combination with The illustrated signal detection device has a configuration in which a series circuit of a resistor 5 and a voltage source 6 is connected in parallel with a signal input device 4. In this configuration, when the magnet 1 rotates, a current that is a combination of the signal current generated by the coil 2 and the current flowing by the voltage source 6 flows through the connector 3. This means that even if the current induced in the coil 2 is small, a relatively large amount of current flows through the connector 3, and even if a conduction failure occurs due to insulation adhering to the connector 3, this conduction failure will cause the current to flow through the connector 3. impact can be avoided. here.

The current that flows due to the connection of the voltage source 6 is called a contact failure prevention current. To give a specific example, although it differs depending on the type of connector, if all 5V voltage sources 6 are used as the voltage source 6 and a current of 1 mA flows, conduction failure due to the connector 3 can be prevented. It goes without saying that a current source may be used instead of the voltage source 6.

〔Effect of the invention〕

With the above configuration, the current value at the connector is the sum of the signal current generated in the coil due to the rotation of the magnet and the current from the voltage source, which is higher than when no stain pressure source is provided. Therefore, the effects of the present invention are that conduction defects caused by insulating substances adhering to the connector can be ignored, contact reliability can be maintained, and the present invention is economically extremely inexpensive without using expensive connectors. You can do it.

[Brief explanation of drawings]

FIG. 1 shows a signal detection device of the present invention, and FIG. 2 shows a diagram of a conventional signal detection device. DESCRIPTION OF SYMBOLS 1... Magnet, 2... Coil, 3... Connector, 4... Signal input device, 5... Resistor, 6... Voltage source. Figure 1

Claims (1)

[Claims] 1. A coil having a pair of terminals, a connector connected to the pair of terminals, and a signal input device that is connectable to and disconnectable from the connector and detects a signal from the coil. 2. A signal detection device for a coil, characterized in that the connector has a power source that applies an electric signal for preventing conduction failure so as to be superimposed on a signal from the coil.