JPH0652294B2 - Recognition method for coil energizing circuits for linear motors - Google Patents

Description

TECHNICAL FIELD The present invention relates to a failure diagnosis system for a coil for a linear motor.

[Problems to be Solved by Prior Art and Invention]

Heretofore, no actual example of failure diagnosis of a current-carrying circuit of a linear motor coil has been published.

In the underground power cable system, there is an example in which a penetration type current transformer is inserted into the cross-bonded ground wire to detect an accident.
It is not possible to apply the same method to a current-carrying circuit to which a coil for a linear motor, which has only a semi-conductive external shield, is connected to perform self-detection.

It is an object of the present invention to invent a system capable of constantly performing a failure diagnosis of a coil energizing circuit for a linear motor during operation, and to utilize it for maintenance of a coil system of a linear motor car.

[Means and Actions for Solving Problems]

According to the present invention, since the failure of the energizing circuit of the coil for the linear motor is diagnosed, the penetration type current transformer (C
The cable placement technology for T) was adopted as an original method. That is, the two metal-shielded energizing cables for supplying power to the linear motor coil are collectively penetrated into the through-type current transformer, and the two metal shields are provided on the linear motor coil side with respect to the through-type current transformer. Any of the metal shielding sheaths of the energized cables with a ground is grounded, so that the penetration current transformer (CT) is large due to the energization current supplied to the coil for the linear motor through the two energized cables with a metal shield for energization. It balances the output so that it does not appear, and when a cable fails, the balance is lost so that an accident can be detected through the through current transformer.

〔Example〕

FIG. 1 shows the configuration of a failure detection circuit for a failure diagnosis method for a coil energizing circuit for a linear motor according to an embodiment of the present invention.

The linear motor coil 1 has a semi-conductive outer shield 2, and its power supply terminals (input / output terminals) 3 and 3 are terminated with two power cables 7 and 7, respectively. The two current-carrying cables 7, 7 are composed of a cable conductor 3, an insulator 5, and a metal shielding sheath 6, respectively. Then, these are collectively inserted into the through current transformer (CT) 8. The energizing cables 7 and 7 ground any metal shielding sheaths 6 and 6 on the side of the linear motor coil 1 with respect to the penetrating position of the penetration type current transformer (CT) 8 by grounding wires 9 and 9.

The energizing current of the linear motor coil 1 is canceled by the input and the output and does not appear in the through type current transformer 8. However, in FIG. 1, the energizing cables 7 and 7 are through type current transformers (CT). When dielectric breakdown occurs below 8, a current flows into the metal shielding sheaths 6 and 6 and flows into the ground through the installation lines 9 and 9. The current flowing in this way is caught by the through-type current transformer 8 and becomes the output of the through-type current transformer 8. If this output is detected and transmitted, failure detection can be performed.

In addition, even if both power cables 7 and 7 break down at the same time,
The currents flowing through the respective metal shielding sheaths 6 and 6 are in the same direction, and therefore can be detected. At this time, the output of the through-type current transformer 8 becomes larger than the failure of one current-carrying cable, which further facilitates failure detection.

〔The invention's effect〕

As described above, according to the failure diagnosis method of the linear motor coil energization circuit of the present invention, it is possible to provide the first system capable of diagnosing the failure of the linear motor coil energization circuit.

Since the system can be constantly diagnosed during operation, it enables completely unmanned maintenance of the linear motor coil energization circuit system.

By using this application of the same applicant together with the method of diagnosing the coil for linear motor applied on the same day, it is possible to unmanned the maintenance of the entire ground coil system of the ground primary linear motor car.

It is a great feature that the detection circuit and the determination circuit can be shared by the linear motor coil diagnosis through-type current transformer and the energization circuit diagnosis through-type current transformer.

[Brief description of drawings]

FIG. 1 is a diagram showing a detection device of an energization cable penetration system to which the method for diagnosing a failure of a coil energization circuit for a linear motor of the present invention is applied. In the reference numeral, 1 is a coil for a linear motor, 2 is a semi-conductive outer shield, 3 is a power supply terminal, 4 is a cable conductor, 5 is an insulator of the cable, 6 is a metal shielding sheath of the cable, 7 is a conducting cable, and 8 is Through-type current transformer (CT), 9 is a ground wire.

Claims (1)

[Claims] 1. A power supply 2 for supplying power to a coil (1) for a linear motor.
Two metal-shielded energizing cables (7, 7) are collectively passed through the through-type current transformer (8), and two metal-shielded energizing currents are provided on the linear motor coil side of the through-type current transformer. Fault diagnosis of the coil energizing circuit for the linear motor in which any metal shielding sheath (6, 6) of the cable is grounded, and the output generated in the penetration type current transformer is judged when the energizing circuit fails to detect an accident. Law.