JPH08182184A - Alternator - Google Patents

Abstract

(57) [Summary] [Constitution] The battery 2 is connected to the alternator 1 via the key switch 10 and the switch 3. The switch 3 includes a control coil 31 for controlling opening / closing of the switch 3. Also, alternator 1
Is composed of a field coil 4, a stator coil 5, a rectifying diode 6, a voltage regulator 7, a zero-phase current detecting iron core 8 and a detecting coil 81. A detection coil 81 is built in the zero-phase current detection iron core 8. The display unit 9 and the control coil 31 are electrically connected from the voltage regulator 7. The respective electric signals are the display command signal 91 and the control command signal 311. [Effect] It is possible to suppress the generation of sparks and prevent the sparks from igniting hydrogen generated from the battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting method for an alternator for a vehicle, and more particularly to an alternator structure suitable for detecting a leakage of a stator coil.

[0002]

2. Description of the Related Art In the prior art, there is no known example of detecting the electric leakage of the alternator as in the present invention, but as described in JP-A-4-156234, one phase of the three-phase stator winding is used for voltage adjustment. It was connected to the reactor, and the magnitude of the voltage generated by the stator or the frequency of the AC voltage was used to determine whether the alternator was normally generating power.

[0003]

The above-mentioned prior art has a problem in that it is impossible to detect abnormality in other windings because one phase voltage of the stator winding is detected.

An object of the present invention is to detect an abnormality of an alternator by taking in a three-phase generated current of each phase and detecting a zero-phase current at the time of failure.

[0005]

In order to achieve the above object, the present invention provides a secondary winding in the magnetic circuit iron core while penetrating the output coil of each phase of the alternator in the inner diameter of the closed magnetic circuit. Zero-phase current detection The iron core is designed to detect the zero-phase current that occurs during an abnormality.

[0006]

In the zero-phase current detecting iron core arranged inside the alternator, the generated current is unbalanced unless the magnitude of the voltage generated from the three-phase stator windings is the same. Due to this imbalance, an alternating magnetic flux is generated in the iron core penetrating the wires of each phase, and as a result, an AC voltage is generated in the detection coil which is the secondary winding wound around the iron core. It is possible to detect the leakage of the stator coil based on the magnitude of this AC voltage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows the overall configuration of the alternator of the present invention. First, the configuration will be described. Battery 2
The positive terminal of is connected to the B terminal 11 of the alternator 1 via the switch 3. Further, the positive terminal of the battery is connected via a key switch 10 to a voltage regulator 7 arranged inside the alternator. Switch 3 has
A control coil 31 for controlling opening / closing of the switch 3 is built in. Further, the alternator 1 is composed of a field coil 4, a stator coil 5, a rectifying diode 6, a voltage regulator 7, and a zero-phase current detecting iron core 8. The zero-phase current detection iron core 8 has a detection coil 81 wound around a ring-shaped iron core, and three-phase stator coils are collectively penetrated inside the ring. The display unit 9 and the control coil 31 are electrically connected from the voltage regulator 7.
The respective electric signals are the display command signal 91 and the control command signal 311. The negative terminal of the battery 2 is connected to the ground terminal 12 of the alternator 1.

Next, the operation will be described. When the key switch 10 is turned on, the battery voltage is applied to the voltage regulator 7. The voltage regulator 7 detects the value of this voltage and operates the control command signal 311 so that a current flows through the control coil 31 of the switch 3 to turn on the switch 3. Due to the operation, the battery voltage of the battery 2 becomes B of the alternator 1.
It is applied to the rectifying diode 6 via the terminal 11. Then, the voltage regulator 7 initially excites the field coil 4 and stands by so that the engine may be started at any time. When the engine is started, three-phase induced voltages are generated in the stator coil 5. These coils are full-wave rectified because they are connected to the rectifying diode 6, and a DC voltage is generated at the output of the rectifying diode. Then, this voltage is applied to the battery 2 to charge the battery. At this time, the voltage regulator controls the current flowing through the field coil 4 described above so that the voltage applied to the battery is approximately 14.3 volts.

In the present invention, since the zero-phase current detection described above is performed between the stator coil 5 and the rectifying diode 6, the zero-phase current detection iron core 8 is alternately magnetized with the magnetic flux for the generated current of each phase. . Since these stator coils 5 are three-phase windings and have a phase difference of 120 degrees as described above, the zero-phase current detection iron core 8 has three-phase alternating magnetic fluxes having a phase difference of 120 degrees. Intersect. Therefore, the magnetic fluxes thereof are canceled out in the iron core, and a voltage is not normally generated in the detection coil 81. Therefore, no voltage is applied to the voltage regulator 7 from the detection coil 81. Next, the stator coil 5
If a short circuit or a short circuit between coils occurs in one of the phases of the alternator (not shown), the balance of the voltage generated in the stator coil is lost. Therefore, an imbalance occurs in the magnetic flux alternating the zero-phase current detection iron core 8, and an AC voltage is generated in the detection coil 81. This AC voltage is amplified by an amplifier provided in the voltage regulator 7, and an abnormality is determined by detecting this value. Therefore, when an abnormality occurs, the voltage regulator 7 stops the energization of the field coil 4 and outputs the display command signal 91 to the display unit 9, and then the switch 3 arranged between the battery 2 and the alternator 1. The energization of the control coil 31 is stopped and the switch 3 is turned off. Therefore, the battery 2 and the alternator 1 are electrically disconnected, and the current is prevented from flowing from the battery to the alternator 1. This display command signal 91
Is a display urging the driver to send the car to a repair shop as soon as possible. Or, it is an instruction to avoid unnecessary use of lights, air conditioners, heat wires, etc. that consume electricity because electricity cannot be generated due to an abnormality in the alternator. This state is shown in the flow chart of FIG. In other words, the voltage regulator 7 detects the output signal of the zero-phase current detection iron core 8 with the detection coil 81, amplifies the value by the amplifier provided in the voltage regulator 7, and only the display command depending on the magnitude of the amplitude. Is executed or the energization of the field current is stopped and the display command is issued, and then the switch 3 is turned off.

As described above, the zero-phase current detection iron core 8 and the detection coil 8 which can detect the imbalance of the generated voltage inside the switch 3 and the alternator 1 are newly added to the conventional charging system.
By providing 1 to prevent leakage of the stator coil 5 and disconnection, etc., it is possible to suppress the generation of sparks in these parts and prevent the sparks from igniting hydrogen generated from the battery. There is an effect that can prevent danger such as.

[0011]

According to the present invention, by detecting the imbalance of the AC voltage of the alternator, it is possible to detect leakage, short circuit, disconnection, etc. of the stator coil.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an alternator charging system according to an embodiment of the present invention.

FIG. 2 is a flowchart of the operation of the voltage regulator.

[Explanation of symbols]

1 ... Alternator, 2 ... Battery, 3 ... Switch, 4 ...
Field coil, 5 ... Stator coil, 6 ... Rectifier diode, 7 ... Voltage regulator, 8 ... Zero-phase current detection iron core, 9 ...
Display unit, 10 ... key switch, 11 ... B terminal, 1
2 ... Ground terminal, 31 ... Control coil, 81 ... Detection coil, 91 ... Display command signal, 311 ... Control command signal.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keiichi Masuno 2520 Takaba, Hitachinaka City, Ibaraki Prefecture Hitachi Ltd. Automotive Equipment Division

Claims (2)

[Claims] 1. An alternator comprising: a stator coil for generating an AC output inside the alternator; a diode for rectifying the AC output voltage; and a voltage control circuit for controlling a generated output voltage. Of the output wire of each phase is configured so as to close the outer peripheral portion of the output wire for zero-phase current detection and a secondary winding wound around the iron core, the output signal of the secondary winding An alternator characterized by detecting abnormality of a stator coil. 2. The alternator according to claim 1, wherein the output signal of the secondary winding selects an operation function according to the magnitude of the amplitude of the signal.