Synchronous motor-generator set

FIELD: using three-phase synchronous machines for power generation.

SUBSTANCE: proposed motor-generator set has three-phase synchronous motor and three-phase synchronous generator both mounted on common shaft excited by permanent magnets. Motor and generator rotors and stators are salient-pole components. Stator poles carry stator windings. Motor and generator stator poles measure 120 electrical degrees along rotor outer circumference. Motor and stator field permanent magnets are disposed on rotor backs between its poles. Flat compensating permanent magnets installed in center of generator rotor poles are disposed in panes crossing generator axis.

EFFECT: enhanced economic efficiency of power generation.

1 cl, 4 dwg

 

The invention involves using a three-phase synchronous machines of special design with excitation from permanent magnets BUT 2 21/27.

It is now widely known design of three-phase synchronous machines (motors and generators), including with excitation from permanent magnets.

The design of such synchronous machines are described, for example, in the book Men “Electric machinery and transformers”, part II, Moscow, publishing house of the Higher school”, 1976

Design description synchronous machine with excitation from permanent magnets can be taken as a prototype synchronous machines proposed in the present invention.

The disadvantage of the existing synchronous machines is that the magnetic flux generated by the permanent magnet poles of the rotor crosses the conductors of the stator winding placed in the slots of the inner surface of the stator. This generated electric power of the generator is equal to the required mechanical power applied to the generator rotor (without taking into account energy losses in the stator and mechanical energy losses in the rotor).

Similarly, the mechanical power developed by the engine is equal to the power consumed by the motor from the power source (without energy loss).

Therefore the efficiency of the existing synchronous machines, making the s for prototypes, always less than one.

The technical result, which directed the present invention is to provide a three-phase electric machines (motor and generator) with efficiency, larger units combined on the same shaft in the machine, allowing the generation of electricity without wasting any energy.

The device is a synchronous motor-generator (SDG) consists of a three-phase synchronous motor (DCT) and the three-phase synchronous generator (TSG), which is on the same shaft, placed in the General case.

Engine and generator are made with salient poles of the stator and rotor windings of the stator (OS), is wound around the stator poles.

The stator is composed of the stator poles (PS) and “back” of the stator (SS)made from electrical steel sheet.

The rotor, consisting of poles of the rotor (PR) and the back of the rotor (CF), is made of solid electrical steel.

In the back of the rotor are placed permanent magnet excitation (CEM).

In the center of the poles of the rotor of the generator is additionally placed flat small thickness compensating permanent magnets (PMC), located in the plane containing the axis of the generator.

The design of the engines DCT is the small thickness of the permanent magnet excitation (2hRAP).

Long is a of the stator poles along the inner surface of the stator (l PS) is 60 electrical degrees; the length of rotor poles along the outer surface of the rotor (lCR) is 120 electrical degrees.

The number of stator poles (mC) multiple of three and is equal to mC=3P, where P is the number of pairs of poles in the machine. The number of rotor poles (mP) is equal to: mP=2P.

All parts of the magnetic circuits of the motor and generator are “unsaturated”, which allows to take into account the magnetic resistance of only the permanent magnets and the air gap.

Schematic cross-section DCT and TSG shown in figure 1 and 2 respectively.

When applying to the stator winding of the synchronous motor three-phase voltage to the motor when the rotor to synchronous speed produces a rotating magnetic field of the stator. The magnitude of the magnetic flux of the stator fCis determined by the magnetizing force of the windings of the stator iWOCand the magnetic resistance of the air gap (R) and permanent magnet excitation (RMPMV)

where i is the effective value of the current in OS []

WOC- the number of turns of the OS

hCEMthe thickness of the permanent magnet excitation, per pole [m],

SPS- cross section of the pole stator [m2],

δ - thickness of air is on clearance [m].

Permanent magnet excitation (CEM) of rotor poles create poles of the stator magnetic flux of the rotor fPequal to

where

In0- the residual value of the induction CEM [T].

The total flux in the stator poles is equal to the geometric sum of flows.

Developed by the engine torque is equal to:

where θ - the angle between the axes of the threadin electrical degrees,

k - coefficient depending on engine parameters.

Due to the low value of Rthe value ofbig enough with negligible amount of current in the stator winding and, consequently, with a small amount of power consumed from the power source.

This ensures high efficiency of DCT.

The power generated by the generator WGequal to:

where mC- the number of stator poles,

- the voltage on the stator winding,

- the effective value of the electromotive force generated in the OS

FCMOUTH·SPS[WB] - the value of the magnetic flux of the rotor pole stator,

- induction created by CEM in the air gap.

Thanks to compensate for the magnetizing force generated by the currents of the windings of the stator with the compensation of permanent magnets, the magnetic flux of the stator fWithit is small, and therefore, the brake torque of the generator is determined mainly by the no-load losses, which provides increased efficiency of the generator. Compensation NMS generated by currents in the operating system are illustrated in figure 3, which shows linear “scan” of rotor poles and stator path of magnetic flux from the permanent magnet excitation (CEM) and from NMS stator currents (iOSif no compensation of permanent magnets (PMC) at different positions of the poles of the rotor relative to the stator poles.

The path of magnetic flux of the rotor shown in solid lines; the path of magnetic flux stator - dotted lines. Arrows V shows the direction of movement of rotor poles. The arrows “e” shows the direction of the NMS in the stator poles generated by the currents in the windings of the stator.

Figure 1 shows the schematic cross-section of the DCT with the number of pairs of poles P=4.

In figure 1 the following notation:

1 - “back” of the stator (SS)

2 - pole stator (PS)

3 - stator winding (OS)

4 - pole rotor (cont'd)

5 - “back” mouth is RA (WED)

6 - permanent magnet excitation (CEM)

The arrows indicate the direction NMS CEM.

Figure 2 presents a schematic cross-section of TSG with the number of pairs of poles P=4.

In figure 2 the following notation:

1 - “back” of the stator (SS)

2 - pole stator (PS)

3 - stator winding (OS)

4 - pole rotor (cont'd)

5 - “back” of the rotor (WED)

6 - permanent magnet excitation (CEM)

7 - permanent magnets compensation (PMC)

The arrows indicate the direction NMS CEM and PMC.

Figure 3 presents linear “scan” of rotor poles and stator and the path of magnetic fluxes of the rotor and stator at different positions of the poles of the rotor relative to the stator poles.

The arrows indicate the direction of magnetic flux and NMS CEM and PMC.

Figure 4 shows a structural diagram of the Autonomous power plant (NPP).

Figure 4 the following notation:

D - engine

G - generator

AI - Autonomous inverter

AB - battery

MPR-U - microprocessor control

ZU - charger

Synchronous motor generator (SDG) is intended for use in independent power plant (NPP) to supply customers with three-phase or single-phase alternating current or for power users, DC (after rectification).

The structural scheme And Is From the one shown in figure 4. The initial start of the engine (E) and maintaining the required speed is at its power from the battery (AB) using a three-phase pulse width modulation (AI) at the appropriate frequency and voltage three-phase voltage to the motor windings.

In the process, SDG battery is maintained in a fully charged state by the charging device (MD).

The process of manufacturing SDG is almost the same technology and applied materials from manufacturer serial synchronous machines with permanent magnets and can be implemented on a conventional electric machinery enterprises.

In SDG can be used widely used in electrical engineering, the permanent magnets of NdFeB with a residual induction of In0=1,2 T, the coercive force HWith=12 kOe, and the magnetization J=Be 955,000 A/m

The device is a synchronous motor-generator consisting of located on the same shaft three-phase synchronous motor and three-phase synchronous generator, which is made with excitation from permanent magnets, characterized in that the rotor and the stator of the motor and generator have expressed pole stator winding wound around the stator poles in the motor and generator dimensions of stator poles along in the morning the circumference of the stator 60 electrical degrees, and the size of rotor poles along the outer circumference of the rotor are 120 electrical degrees, the permanent magnet excitation in the engine and the generator is placed in the backside of the rotor between its poles, center poles of the rotor of the generator are flat compensation permanent magnets placed in planes passing through the axis of the generator.



 

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