JPH0829477A - Device for inspecting revolving electric machine for turbocharger - Google Patents

Abstract

PURPOSE:To inspect, according to abnormal current values, the windings of a revolving electric machine for a turbocharger by applying voltages to each of multiphase stator windings in sequence prior to operation of the revolving electric machine. CONSTITUTION:A current sensor 6 and a TrY are provided between the neutral point N of the star connection of the stator of the revolving electric machine and the (-) side of a battery 3, and a TrX bypassing a booster circuit 2 is mounted between an inverter 4 and the (+) side of the battery 3. A detected voltage from the current sensor 6 is input to a controller 5 which transmits base signals to each of the transistors of the inverter 4 corresponding to the winding of each phase of the stator, and an alarm device 7 is attached to the controller as an output. With the TrX and the TrY both turned on, a battery voltage is applied to each winding, and when the current value of the current sensor 6 is abnormal the alarm device 7 is actuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine for a turbocharger, which is installed on a rotary shaft of a turbocharger and checks the winding line of the rotary electric machine for electric / power generation operation, and for issuing a warning in case of abnormality. Inspection device.

[0002]

2. Description of the Related Art In recent years, a rotary electric machine for electric / electric power generation is attached to a rotary shaft of a turbocharger, which serves as a supercharging mechanism of an engine, and is electrically driven according to an operating state of the engine to assist the supercharging operation of the turbocharger. Alternatively, power generation is operated to recover exhaust energy as electric power for charging a battery.

Further, the coil wire of the rotary electric machine attached to such a turbocharger is apt to cause an accident such as a temperature rise due to the influence of exhaust gas and a short circuit due to high speed rotation.
Therefore, as a device for protecting an accident due to a short circuit of the winding wire of this type of rotary electric machine, a protection device for a rotary electric machine for turbo is filed in Japanese Patent Application No. 208946 of 1993.

[0004]

The protective device according to the above-mentioned application protects the rotating electric machine by controlling the disconnection of the line and the exhaust flow to the turbocharger based on the current value of the rotating electric machine during operation. However, especially in the case of a short-circuit accident, not only the winding wire of the rotating electric machine but also the inverter of the power supply source may be damaged. In particular, an inverter using a semiconductor device is likely to be instantly damaged by an excessive current.

The present invention is intended to solve such a conventional problem, and its purpose is to check the stator winding before the operation of the rotating electric machine, and not to operate the rotating electric machine when an abnormality is detected. , To provide an inspection device for a rotary electric machine for a turbocharger which warns a driver.

[0006]

In order to achieve the above-mentioned object, according to the present invention, there is provided a star-connected multiphase winding wire mounted on the rotary shaft of a turbocharger, and the AC power from the inverter is used. In the inspection device of the rotating electric machine for turbocharger for inspecting the winding line of the driven rotating electric machine, the current detecting means for measuring the electric current from the neutral point of the star-shaped connection and the multi-phase winding line Energizing means for energizing each of the winding wires by controlling the elements of the corresponding inverters, and inspection means for sequentially controlling these energizing means in accordance with the multiple phases and detecting an abnormality by the signal of the current detecting means. An inspection device for a rotary electric machine for a turbocharger is provided.

Further, according to the present invention, there is provided an inspection device for a rotary electric machine for a turbocharger, which prohibits the operation of the rotary electric machine when an abnormality is detected in the winding line of the rotary electric machine and warns the driver of the abnormality.

[0008]

[Operation] Before the rotating electric machine is operated, the transistors of the inverter corresponding to each of the stator windings are controlled to sequentially energize the battery voltage for each winding of each phase and check the current value from the neutral point. Therefore, due to the abnormal current value, a short circuit or disconnection accident of the winding wire of each phase can be detected, and the detection prohibits the operation of the rotating electric machine and issues a warning to the driver.

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of an inspection device for a rotary electric machine for a turbocharger according to the present invention.

Reference numeral 1 in the figure is a stator of a rotary electric machine, in which three-phase windings U, V, W of star-shaped connection are connected at a neutral point N.

Reference numeral 2 is a booster circuit which boosts the voltage of the electric power supplied from the battery 3 to a predetermined voltage by using, for example, a DC-DC converter, the output of which is the inverter 4
Is supplied to.

The inverter 4 is a transistor A (TrA)
~ Six power transistors of transistor F (TrF) and diodes for absorbing reverse pulse connected in parallel to each transistor are provided, and control signals are input from the controller 5 to the respective base circuits of TrA to TrF. It is wired as shown.

TrX is a transistor between the + side of the battery 3 and the inverter 4, and TrY is − of the battery 3.
A transistor between the side and the neutral point N of the stator 1 is controlled to open / close by a signal from the controller 5, and 6 is a current sensor serving as a current detecting means, which is the neutral point N when TrY is ON.
The detection signal is sent to the controller 5.

The controller 5 comprises a microcomputer, is provided with a central control unit, various memories, input / output circuits, etc., and controls each transistor on the basis of a program stored in the memory when checking the safety of the winding of the stator. The operation of the rotating electric machine and the control of the warning device 7 are performed.

Next, the operation of the present embodiment thus constructed will be described. FIG. 2 is a processing flow chart showing an example of the operation at the time of checking the winding line of the rotating electric machine in the present embodiment,
The operation of this embodiment will be described with reference to FIG.

First, in step 1 in FIG. 2, it is confirmed whether or not the power is turned on by turning on the key switch, and in step 2, TrX and TrY are turned on for checking before the operation of the rotating electric machine. . This is because when a high voltage is supplied to the winding line of the stator which is stopped via the booster circuit 2, a large current is passed and it is dangerous. Therefore, the booster circuit 2 is bypassed and each battery voltage of a low voltage is used. This is to check the bank line.

At step 3, TrB is turned on to pass a current through the winding line U of the stator 1, and the current value is measured by the current sensor 6 between the neutral point N and the negative side of the battery 3, and at step 5, Turn off TrB. Then, in step 6, it is checked whether or not this current value is normal, and if it is normal, the process proceeds to step 7. However, if it is an abnormal value, the process proceeds to step 13 to turn off TrX and TrY to operate the rotary electric machine. This is prohibited and the warning device 7 is activated to notify the driver (steps 14 and 15).

When the current value in step 6 is normal and the process proceeds to step 7, TrA is turned on to pass a current through the winding line V, and a current from the neutral point N to the battery 3 is detected by the current sensor 6. Read, turn off TrA in step 9. In step 10, the current value passing through the winding line V is checked, and if it is an abnormal value, the process proceeds to step 13 to turn off TrX and TrY, prohibit the operation of the rotating electric machine, and turn off the warning device 7 as in the above case. The operation is performed (steps 14 and 15).

If step 10 is normal, step 11
After that, turn on TrC to check the line W /
The OFF control and the current value check are performed according to the case of the above-mentioned check of the winding line U or the winding line V, and when the current value is normal, TrX and TrY are turned off and the control of the normal rotating electric machine is performed. (Steps 12, 16-19). During this time, if the current value check in step 17 is abnormal, the flow proceeds to step 13 to prohibit the operation of the rotating electric machine and activate the warning device 7.

As described above, in this embodiment, the battery voltage before boosting is applied to the winding wire of each phase before the operation of the rotating electric machine, and the passing current is checked for each phase to determine a short circuit, a disconnection, etc. In the case of an abnormality, the operation of the rotating electric machine is prohibited and the driver is warned.

[0021]

As described above, according to the present invention, the current detecting means for measuring the current from the neutral point of the star-shaped connection of the stator windings and the inverters corresponding to the respective three-phase windings are provided. An energizing means for turning on the transistor element to energize each winding wire is provided, and these energizing means are sequentially controlled before the rotation of the rotating electric machine to energize the winding wire to detect an abnormality by the energization value and rotate. Since the operation prohibition of the electric machine and the warning are issued, the state of the rotating electric machine can be understood, and the effect of preventing the destruction of the inverter and the like can be obtained.

Further, in the present invention, since the energizing means energizes the battery voltage before boosting in the boosting circuit when checking the winding line, an adverse effect on the winding line and the elements of the inverter due to an excessive current can be prevented.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an inspection device for a rotary electric machine for a turbocharger according to the present invention.

FIG. 2 is a process flow chart showing an example of the operation of the present embodiment.

[Explanation of symbols]

 1 Stator 2 Booster circuit 3 Battery 4 Inverter 5 Controller 6 Current sensor 7 Warning device

Claims (3)

[Claims] 1. An inspection of a rotary electric machine for a turbocharger, which comprises a polyphase winding wire connected to a rotating shaft of a turbocharger and connected in a star shape to inspect the winding wire of a rotating electric machine driven by AC power from an inverter. In the device, current detection means for measuring the current from the neutral point of the star-shaped connection, and energization for energizing each of the multiphase windings by controlling the closing of the elements of the inverter An inspection device for a turbocharger rotating electric machine, comprising: a means and an inspection means for sequentially controlling the energizing means in accordance with multiple phases to detect an abnormality by a signal from the current detection means. 2. The inspection apparatus for a rotary electric machine for a turbocharger according to claim 1, wherein the inspection means warns the operation prohibition and the abnormality of the rotary electric machine upon the above detection. 3. The inspection apparatus for a rotary electric machine for a turbocharger according to claim 1, wherein the energizing means applies a voltage lower than an applied voltage during operation of the rotary electric machine to the winding wire.