JPH01501497A - Starting device for turbine engines operated by inverters - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] A total of 11 turbine engines with 21 inverters. This invention applies to turbine engines such as those used in aircraft. Existing starting systems for engines, especially generators associated with turbine engines. The invention relates to a starting device that makes parts virtually available.

Power generation and dispatch For example, a turbine engine used in an aircraft can be started in one of a variety of ways. One typical starting method is to connect the engine to the turbine engine in a driving relationship. air turbines can be used. When you want to start a turbine engine, pressurization from the auxiliary power unit (APU) until the engine is brought to self-sustaining speed. Supply air to the turbine engine to drive it.

The difficulty with this solution is that the air turbine is permanently connected to the turbine engine. That is. Its presence therefore adds weight to the aircraft and reduces its useful load. . Additionally, the presence of an air turbine is often associated with the turbine engine housing. While this may increase the frontal area and thus increase aerodynamic drag, Reduces aircraft efficiency.

Electric starters are also used. Justifying the use of one or more turbine engines Most aircraft of sufficient size and capacity to Since a relatively high power generator is required, the generator is in engine start mode. It is operated as a medium electric motor and thus drives the turbine engine to self-sustaining speed. There were a number of suggestions that could be used to of a generator when used as an electric motor Power is provided by the APU or by an already rotating turbine in multi-engine aircraft. - Can be supplied from the engine's power generator.

This type of electrical device has been quite successful in its intended purpose. However, many In the case of and run the constant speed drive in reverse direction during engine start mode or shall be provided with a mechanical device for bypassing electrical equipment; this generally requires an extra mechanical part, and this mechanical part has a fairly robust structure due to the various forces. must be constructed, thus adding weight to the aircraft. If such The parts are located at the front of the engine housing leading to increased aerodynamic drag. It can even increase the area.

There are other types of generators used in aircraft, such as on so-called VSCFSCs.

On the VSCFSC is a variable speed constant frequency inverter device. such a device It is desirable to provide means for the generator in such equipment to is alternately used as a starter to start the associated turbine engine. obtain. This invention is intended to result in a device with minimal weight and minimal loss of efficiency. It is something to be achieved.

i ratio to 11 The main purpose of this invention is to use it with turbine engines such as those used in aircraft. The object of the present invention is to provide a new and improved starter-generator for use. a little more To explain in detail, the purpose of this invention is to reduce the weight and weight required to exhibit starting performance. power generation using variable speed constant frequency inverters in a manner that minimizes efficiency and efficiency losses. The purpose of the present invention is to provide a device for use in electrical equipment.

An exemplary embodiment of the invention includes a brushless generator coupled to a turbine. Achieving the aforementioned objectives with a power generator having at least one multi-phase output winding do.

Power can be induced in the output winding by the magnetic field generated in the main field winding energized by the exciter. Ru. Contains two diodes for each phase and also includes a full-wave rectifier connected to the bridge. be caught.

The bridge is connected to the output winding and provides a DC output for use in the device. It looks like this. According to this invention, the generator is constructed by using a plurality of semiconductor devices. It is used as an AC synchronous starting motor for turbines, and the semiconductor element is die-cut. One for each diode and in shunt relationship with the corresponding diode in the bridge. It has a connected conductive path. Inverter controllers are control voltages for semiconductor devices. Select the semiconductor device so that it is connected to the pole and the semiconductor device operates as an inverter. to operate. for selectively applying a DC signal to the bridge as opposed to the output winding. The device is completed by providing means for this purpose.

As a result, an additional The hardware used is nothing more than a semiconductor device and its controller.

In a highly preferred embodiment, the semiconductor element is a transistor and the conductive path is an emitter. It is a conductive path between the collector and the collector, and the control electrode is the base.

The invention provides an AC signal and on the side opposite the output winding, i.e. a DC A variable speed one connected to the bridge on the same side as a means for selectively applying signals. Discusses the use of the aforementioned components in equipment that further includes a constant frequency inverter. .

Other objects and advantages will become apparent from the following description of the accompanying drawings.

[L to Ii Figure 1 shows an aircraft turbine engine that utilizes a variable speed constant frequency inverter. Schematic diagram of an existing power generation set operated by a turbine engine such as a be.

Figure 2 shows how the rectifier bridge seen in the prior art is converted to an inverter to generate the device. Examples of parts added by this invention so that they can be used for starting in addition to electricity 2 is a schematic circuit diagram similar to FIG. 1.

Follow-US JU bill! ” [Friend] A typical conventional power generation system using a variable speed constant frequency inverter is shown in Figure 1. is shown. This means that the present invention provides a device that has engine starting performance. will be explained in detail with regard to serving.

The device shown in Figure 1 uses a wound field wide-band brushless generator of conventional construction. 1, the generator includes one or more generator output windings 10, as is well known in the art. Two such windings are provided, each wired in a three-phase star, as shown in The windings mounted on the generator rotor and designated by the symbol 12 are often “Power is induced in the winding 10 as a result of a rotating field called main field 2. The field produces a rotating magnetic field, which is generated by the electric power supplied by the exciter 14. Re, excitation! 14 is conventionally energized by a permanent magnet generator tlfi (PMG) 16. It will be done. All of these components form part of the brushless generator and are part of the generator motor. is driven by a turbine engine 18 coupled to the generator rotor when operated at It can be done.

Conventionally, each branch of each winding 10 is connected to a junction 20 between two diodes 22. It is. Therefore, when the device is operated as a generator, the output winding 10 There are two diodes 22 for each phase provided. The diode 22 is connected to the pole shown in the figure. connected at the same time and consisting of three branches 24, 26 and 28 (one for each phase) form a bridge. These branches 24, 26 and 28 are connected in parallel and The side of each diode 22 far from the connection point 22 is connected to a light source. lines 30 and 32, and these lines 30 and 32 are connected to conventional variable speed constant A frequency inverter 34 is connected. Brushless power generation as shown in Figure 1 If the machine comprises two or more windings 10, they are constructed in the same manner as described above. A separate bridge 36 is provided for each winding, the bridge 36 being connected to lines 30 and 38. is connected to the inverter by. Condensers used for conventional purposes A server 40 interconnects lines 30 and 32 and lines 30 and 38 thereto.

As a result of the above explanation, when the turbine is operated, the brushless generator is not operated. It has a frequency output that varies depending on the speed of the turbine 18. Changing frequency output The power is rectified to direct current by the bridge circuit and inverter 34 as described above. is supplied as input to The inverter is conventionally controlled and operated and When used in aircraft, the output line 42. outputs 3-phase 115V, 400Hz AC output. 44 and 46.

I: B Power generation as shown in FIG. 1 and provided with engine starting performance according to the present invention An embodiment of the device is shown in FIG. If the same parts are used, the same number shall be used. number is used. Moreover, for the sake of simplicity, the parts that are common to the conventional device already explained are I won't explain it again.

According to the invention, a semiconductor device such as transistor 48 is provided in each bridge branch 2. 4. is placed in shunt relationship with each diode 22 in each of 26 and 28. vinegar That is, transistor 48 is connected in parallel with each diode, and in each bridge There are as many transistors 48 as there are diodes 22. With such a configuration , the conductive path between the collector and emitter of each transistor 48 is connected to the corresponding diode 22. It is parallel to At the same time, the control electrode or base of each transistor 48 is The control line 50 is connected to the control line 50. Control line 50 is a conventional electronic inverter. - Connected to the controller 52. Conventional operation of the controller 52 causes the The transistor 48 is operated as in the inverter 34 and the diode 22 consumes the stored energy when the corresponding transistor 48 is turned off. Acts as a flywheel diode to

When you want to start the turbine 18, the brushless generator acts as an AC synchronous motor. The alternating current is passed through the winding 10 from the bridge when operating as an inverter. supplied to DC power to the bridge is provided by a switch that can be selectively activated from the power supply 60. via switch 62 to lines 30, 32 and 38. inside this connection Any filter 64 may be used if desired.

The power source 60 may be an auxiliary power unit or an already rotating power source in a multi-engine aircraft. Along with lines 30, 32 and 38 of the generator set associated with other turbines 18 It is also possible to use the output as shown below.

Those skilled in the art will appreciate that the inverter formed using transistor 48 and diode 22 It is recognized that the computer circuit does not provide particularly "clean" AC power. death However, so that a brushless generator can operate as an AC motor, it is It is more than suitable for energizing the wire 10. The most important thing is to start the engine Performance is to be imparted to the equipment with minimal weight addition, and for this it is necessary to All that is required is the addition of transistor 48 and controller 52.

When the starter is operating, it bypasses all alternating current components of the generator, thus preventing the starter from operating. It will also be appreciated that there is no degradation of the AC power obtained from the generator.

Brushless to operate as an electric motor using the inverter performance of Arinomaki Since AC power can be supplied to the generator, it can be used together with an inverter and is clean. A large number of electrical appliances, including capacitors that provide power, but are cut short in terms of power efficiency. Components may be avoided to maximize operating efficiency of the device.

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Claims (3)

[Claims] 1. A magnetic field generated in a main field coupled to an aircraft turbine and energized by an exciter. a brushless camera having at least one multi-phase output winding in which power can be induced by for each phase, interconnected in a bridge connected to said winding. a full-wave rectifier with two diodes and said winding for supplying an alternating current signal; and a variable speed constant frequency inverter connected to said bridge on the opposite side of the line. , in the power generation device of the turbine or the like, The generator may be used as an AC synchronous starting motor for the turbine. and a plurality of transistors, one for each diode; each connected in shunt relationship with the corresponding diode in said bridge. having a conductive path between the collector and the collector; such that the transistor and the diode can operate as an inverter; connected to the base of the transistor for selectively driving the transistor; an inverter controller, means for selectively applying a DC signal to the bridge on the opposite side of the winding; A power generation device characterized by: 2. A magnetic field generated in a main field coupled to an aircraft turbine and energized by an exciter. a brushless camera having at least one multi-phase output winding in which power can be induced by connected to the winding to provide a DC output for use in the generator set; with two diodes for each phase interconnected in a bridge suitable for a full wave rectifier; , The generating pole may be used as an AC synchronous starting motor for the turbine. and a plurality of transistors, one for each diode; each connected in shunt relationship with the corresponding diode in said bridge. having a conductive path between the collector and the collector; such that the transistor and the diode can operate as an inverter; connected to the base of the transistor for selectively driving the transistor; an inverter controller, means for selectively applying a DC signal to the bridge on the opposite side of the winding; A power generation device characterized by: 3. A magnetic field generated in the main field coupled to an aircraft turpin and energized by an exciter. a brushless camera having at least one multi-phase output winding in which power can be induced by for each phase, interconnected in a bridge connected to said winding. a full-wave rectifier with two diodes and said winding for supplying an alternating current signal; and a variable speed constant frequency inverter connected to said bridge on the opposite side of the line. , in the power generation device of the turbine or its analogue, The generator may be used as an AC synchronous starting motor for the turbine. and a plurality of semiconductor elements, one for each diode, the conductive paths, each connected in shunt relationship with a corresponding diode in said bridge; and The semiconductor element and the diode can operate as an inverter. connected to each control electrode of the semiconductor element to selectively operate the semiconductor element; an inverter controller for connecting the DC signal to the bridge on the opposite side of the winding. means for selectively applying the A power generation device characterized by: