CN104065225A - Multi-phase energy storage generator - Google Patents

Abstract

The invention relates to a multi-phase energy storing generator. The multi-phase energy storing generator comprises a stator iron core and a rotor; the stator iron core is divided into a left section and a right section; a m armature winding is arranged in the stator iron core; an excitation winding that is an annular coil coils the stator iron core; an axis of the excitation winding is overlapped with the axis of a motor; the rotor is a salient pole structure with a solid iron core; the stator iron core and the rotor are both of vacuum sealing structures; when direct current flows through the excitation winding, and the rotor is static, space static flux density that is of different directions and alternates between the maximum value and the minimum value respectively appears in air gaps below the left section and the right section of the stator iron core due to different magnetic circuit and magnetic resistance; when the rotor rotates, the space static flux density rotates together with the rotor to generate pulsating magnetic flux induced electromotive force in the armature winding, so as to realize electromechanical energy conversion. The multi-phase energy storing generator has the energy conversion and storing functions and meets the electric energy supply system demand of the whole self power supply under an independent power supply mode.

Description

Multi-phase energy storage generator

technical field

The invention relates to a generator, in particular to a multi-phase energy storage generator.

Background technique

In the working mode powered by diesel generator set, after the diesel engine starts running, it will drive the intermediate frequency generator to generate 220V/400Hz three-phase AC, output 220V/400Hz/25kW three-phase four-wire AC, and output 24VDC/1.5kW DC and 220V/50Hz/8kW AC, a total of three auxiliary power supplies, providing all the auxiliary power for the entire vehicle system to work. The rest of the output of the three-phase intermediate frequency generator is mainly used for the variable frequency speed regulation drive of the drag motor, which drives the high voltage generator to rotate the generator to realize the high voltage output of the high voltage energy storage generator. The voltage from the high-voltage energy storage generator charges the energy storage capacitor through the high-voltage charger. The maximum charging voltage is 5kV, the charging frequency is 10Hz, the maximum charging power is about 2.5MW, and the maximum number of charging pulses in a single working cycle is 90. After the launch completes a working cycle, the speed of the high-voltage generator system driven by the unit will drop from 12,000 rpm at the beginning to about 6,000 rpm. During this period, the kinetic energy stored in the high-voltage energy storage generator is mainly converted into the output of the high-voltage generator. to complete multiple consecutive charges to the capacitor bank. After a launch cycle is completed, during the 25-30 minute launch interval when the laser transmitter must be cooled, the motor drives the high-voltage energy storage generator system to increase the speed of the high-voltage energy storage generator system from the reduced 6000 rpm to the initial 12000 rpm. Minutes (the ramp-up time is less than 2 minutes), ready for the next launch cycle. The core component of the self-contained power supply subsystem is the high-voltage energy storage generator, which is required by the system to have the functions of energy conversion and energy storage. Existing high-voltage generators are well satisfied with the function of energy conversion, but not easy to meet the function of energy storage, and for the power supply system of the entire self-contained power supply in the self-supply mode, the medium-frequency generator driven by a diesel engine The electrical energy generated by the motor meets the power supply of the drive motor-high-voltage energy storage generator system and the power electronic converter group. It not only requires the charging of the energy storage capacitor at 10Hz, but also meets other equipment in the vehicle-mounted solid structure power supply requirements.

Contents of the invention

The object of the present invention is to overcome the above-mentioned defects and provide a multi-phase energy storage generator which has energy conversion and energy storage functions and can meet the requirements of the electric energy supply system of the entire self-contained power supply in the autonomous power supply mode.

In order to achieve the above object, the multi-phase energy storage generator designed by the present invention includes a stator core and a rotor. The stator core is divided into left and right sections, an armature winding is arranged in the stator core, and an excitation winding is arranged on the stator core. The excitation winding is a circular coil, the axis of the excitation winding coincides with the axis of the motor, the rotor is a salient pole structure with a solid iron core, the stator core and the rotor are vacuum-sealed structures, assisted by vacuum mud, and vacuum pumped The inside of the stator core and the rotor is evacuated. When the excitation winding is supplied with direct current and the rotor is stationary, due to the difference in the reluctance of the magnetic circuit, the air gaps under the left and right stator cores will have the same direction and alternate between the maximum and minimum values. Variable spatial static magnetic density, when the rotor rotates, according to the principle of the minimum path of magnetic flux, the spatial static magnetic density rotates with the rotor, and the pulse vibration magnetic flux induced electromotive force is generated in the armature winding to realize electromechanical energy conversion.

The multi-phase energy storage generator designed by the present invention is the core component of the self-contained power supply subsystem, and the rotor of the high-voltage generator is a solid structure and is forged from alloy steel. Since the rotor has no windings and other additional equipment, it can rotate at high speed, with high reliability and high energy storage characteristics. The output frequency of the motor can directly match the charging pulse frequency. The system is small in size and light in weight.

The generator designed by the present invention is a special homopolar induction motor. The stator core of the motor is divided into two sections, the left and the right, and the armature winding is arranged in it. The connection method is the same as that of the conventional synchronous generator. The excitation winding of the motor is a circular coil, which is also placed on the stator, fixed in the middle of the left and right stator cores, and surrounds the motor rotor. Its axis coincides with the motor axis. There is no winding on the rotor, and it is a solid iron core structure, which can rotate at high speed. It belongs to the brushless excitation generator, which has the advantages of high power density and high efficiency, and is suitable for occasions with limited space volume and weight. The principle of power generation of the present invention: when the excitation winding is supplied with direct current and the rotor is stationary, due to the difference in the reluctance of the magnetic circuit, the direction will not change and the alternating current between the maximum and minimum values will be generated respectively in the air gaps under the left and right stator cores. The variable spatial static magnetic density. When the rotor rotates, the static magnetic density in this space will rotate together with the rotor, and the pulsating magnetic flux will be generated in the armature winding, and then the electric potential will be induced. The induction generator is a synchronous generator.

Energy storage principle of the present invention: the kinetic energy stored by the flywheel rotor , that is, the stored kinetic energy is proportional to the moment of inertia J of the flywheel rotor, and proportional to the square of the flywheel rotor speed. This motor combines the flywheel and the motor into one, and the other function of the motor rotor is the flywheel. The motor adopts a rotor without any winding, which can rotate at high speed and has high energy storage efficiency.

Description of drawings

Fig. 1 is a schematic diagram of a half-section structure of the present invention;

Fig. 2 is the three-dimensional structure of the present invention.

In the figure: 1-support; 2-stator core; 3-rotor; 4-armature winding; 5-excitation winding.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The multi-phase energy storage generator shown in Figure 1 includes a stator core 2 and a rotor 3 with the stator set on a bracket 1. The stator core 2 is divided into left and right sections, and an armature winding 4 is arranged inside the stator core 2. There is an excitation winding 5 on the iron core 2, the excitation winding 5 is a circular coil, the axis of the excitation winding 5 coincides with the axis of the motor, the rotor 3 is a salient pole structure of a solid iron core, and the stator core 2 and the rotor 3 are vacuum-sealed structures. With the help of vacuum mud, the inside of the stator core 2 and the rotor 3 is evacuated by a vacuum pump. When the excitation winding 5 is supplied with direct current and the rotor is stationary, due to the difference in the reluctance of the magnetic circuit, it will be generated in the air gaps under the left and right stator core 2 respectively. The direction is constant and the spatial static magnetic density alternates between the maximum and minimum values. When the rotor rotates, according to the principle of the minimum path of magnetic flux, the spatial static magnetic density rotates with the rotor, and the armature winding 4 generates pulse vibration Through the induced potential, the electromechanical energy conversion is realized.

The electromagnetic design parameters of the generator part are shown in the table below:

Rotor outer diameter 465 mm Number of motor pole pairs 8 rated frequency 1066.67 Hz Total motor length 450 mm Number of stator slots 96 Motor outer diameter 730 mm Rated excitation current 8.5A Excitation margin multiple 1.5 Maximum excitation current 12.8 A Excitation rated power 1234 W Excitation maximum power 2776 W

The high-speed bearings of the high-voltage energy storage generator adopt high-speed bearings. Through strict analysis and calculation, the ultra-precision hybrid ceramic bearings imported from Sweden SKF are used, and are equipped with special grease for high-speed bearings. The parameters are as follows:

1) Bearing load

Unilateral magnetic pull: 3.5kN

Rotor weight: 544.9kg

Motor speed: 6000-12000rpm

2) Bearing selection

Due to the high speed of the bearing, and the bearing will work in a strong constant magnetic field, it is recommended that the fixed end use a face-to-face paired high-precision angular contact ball hybrid ceramic bearing 71914 CD/HCP4A. It is 16000rpm, and the speed that can be achieved when paired is n=0.8*16000=12800rpm; the floating end uses high-precision single-row cylindrical roller hybrid ceramic bearing N 1014KTNHA/HC5SP, and the speed that can be achieved when lubricated by grease is 15000rpm.

The basic principle of high voltage energy storage generator is as follows:

a) Using the periodicity of laser work, when the laser is not emitting, the rotation speed of the motor rotor is increased; and the rotor is a large-mass, large-size rotating body (mechanical energy accumulator) with a large moment of inertia. The improvement of the speed will store a lot of kinetic energy, that is, the inertial energy storage is realized by high-speed rotation;

b) When the laser is emitted, the required power is greater than the stable power provided by the engine, and the speed of the high-speed rotor cannot be maintained; the rotational kinetic energy stored in the high-speed rotor will decrease, and the reduced kinetic energy can just make up for the lack of engine power; That is to say: rely on the release of the rotational kinetic energy (12000-8000 rpm) stored by the high-speed rotor + the stable power provided by the engine to maintain the power required for one emission cycle of the laser, so as to achieve the high peak power of the system with a smaller power engine needs;

c) Repeatedly, when the laser is not emitting, the rotation speed of the motor rotor is increased; when the laser is emitting, the rotational kinetic energy stored in the high-speed rotor is released again. This effectively solves the problem of volume and weight caused by energy storage. But the problem is: because the inertia of the rotating part is too large, the engine cannot directly drive the high-voltage motor. Such a large moment of inertia in a static state will suffocate the engine, that is to say, the engine cannot turn at all, so how to drive the high-voltage motor is very critical.

d) The high-speed rotation of the large inertia rotor and the dynamic balance problem caused by the large inertia rotor.

The role of the high-voltage energy storage generator in the entire self-contained power supply:

The rest of the output of the three-phase intermediate frequency generator is mainly used for the variable frequency speed regulation drive of the drag motor, which drives the high voltage generator to rotate the generator to realize the high voltage output of the high voltage energy storage generator. The voltage from the high-voltage energy storage generator charges the energy storage capacitor through the high-voltage charger. The maximum charging voltage is 5kV, the charging frequency is 10Hz, the maximum charging power is about 2.5MW, and the maximum number of charging pulses in a single working cycle is 90. After the launch completes a working cycle, the speed of the high-voltage generator system driven by the unit will drop from 12,000 rpm at the beginning to about 6,000 rpm. During this period, the kinetic energy stored in the high-voltage energy storage generator is mainly converted into the output of the high-voltage generator. to complete multiple consecutive charges to the capacitor bank. After a launch cycle is completed, during the 25-30 minute launch interval when the laser transmitter must be cooled, the motor drives the high-voltage energy storage generator system to increase the speed of the high-voltage energy storage generator system from the dropped 6000 rpm to the initial 12000 rpm. Minutes (the ramp-up time is less than 2 minutes), ready for the next launch cycle.

Claims (1)

1. a heterogeneous energy-reserving generator, comprise stator core and rotor, it is characterized in that: described stator core is divided into two sections of left and right, in described stator core, be furnished with armature winding, in stator core, be full of excitation winding, described excitation winding is a making toroidal coil, the axis of described excitation winding overlaps with electrical axis, described rotor is the salient-pole structure of solid core, stator core and rotor are vacuum seal structure, adopt vacuum mud auxiliary, stator core and internal rotor are vacuumized with vacuum pump, in the time of the logical direct current of excitation winding and stationary rotor, due to the difference of magnetic circuit reluctance, to produce respectively direction in can the air gap under the stator core of two sections of left and right constant, between maximin, the static magnetic in the space of alternation is close, in the time of rotor, according to magnetic flux minimal path principle, the close rotation together along with rotor of the static magnetic in space, in armature winding, produce pulsating flux of magnetic induction electromotive force, realize energy converting between mechanical.