Controlled asynchronous machine

FIELD: electricity.

SUBSTANCE: in electrical machine the second armature winding is made combined and located in stator slots of the main magnet core; it is equipped with capacitor bank. Second inductor winding is also combines, multi-phase, short-circuited; it is located in stator slots of the main magnet core. The first winding of rotor is connected to toroidal windings of auxiliary magnet core of the rotor; the first winding of stator is connected to output of frequency converter which converts electric energy of current frequency of the second armature winding to required value of control frequency and delivers it to stator winding of the main magnet core in order to create excitation current and rotating electromagnetic field with this control frequency. Control frequency is set at the output so that frequency of output current is permanent notwithstanding frequency of drive rotation.

EFFECT: reducing weight and overall dimensions and improving cooling and ventilation systems.

2 dwg

 

The invention relates to an adjustable electrical machines AC and can be used as a controlled generator or electric industrial applications. Known adjustable asynchronous machine, RF patent №2069440 C1, 6 H02K 17/30 1996, the Drawback of such electrical machines is a narrow control range. This technical solution adopted for the similar. Technical solution most closely related to the present invention described in the patent "adjustable Asynchronous machine, patent RU 2380813 on 27.01.2010, taken as a prototype.

Asynchronous adjustable electric machine adopted for the prototype, contains the main magnetic circuit of the stator and rotor slots and the first windings of alternating current connected to the toroidal windings of the alternating current of the first additional magnetic core, the second armature winding on the stator and the windings of the coil on the rotor, a second magnetic circuit unit of the frequency Converter connecting the first and second stator winding. The prototype has the following disadvantages: - the complexity of the system of ventilation and cooling, as the main magnetic core with windings placed between the two end additional magnetic circuits; - increased axial length of the machine and the rotor, which leads to a significant reduction CR is the critical shaft speed of the machine.

The purpose of the invention to improve cooling and ventilation while reducing the axial length of the machine. This goal is achieved by the fact that unlike the prototype of the second armature winding is made combined, placed in the slots of the stator main magnetic circuit and provided with a capacitor, the second winding of the inductor is made of a combined, multi-phase, squirrel-cage and placed in the slots of the rotor core of the magnetic circuit.

Distinctive features of the proposed invention are: the execution of the second armature winding combined, placed in the slots of the stator main magnetic circuit and provided with a capacitor, the execution of the second winding of the inductor is combined, polyphase, squirrel-cage, and placed the slots of the rotor core of the magnetic circuit.

The proposal meets the criterion of "significant differences"because of the known list information of the established normative document (paragraph 2 of the Rules drafting, filing and examination of applications for patent for an invention), technical solution with signs, like stated, is not found.

1 shows a structural diagram of an asynchronous adjustable machine figure 2 - cross section AA.

Asynchronous adjustable machine includes a main magnetic circuit of the stator 1 with the first winding of the AC 2 and Deuteronomy is the second armature winding 3, the main magnetic circuit of the rotor slots 4 with the first winding AC 5 and the second polyphase, squirrel-cage winding 6, an additional magnetic core 7 with toroidal windings 8 on the rotor and the additional magnetic core 9 with toroidal windings 10 and output terminals 11 on the stator, capacitor 12, the unit of the frequency Converter 13. The first winding 5 of the rotor is connected with toroidal windings 8 additional magnetic core 7. The first stator coil 2 is connected to the output unit of the frequency Converter 13. The second armature winding 3 is connected to the input of the frequency Converter 13 and is connected to the capacitor 12.

The device operates as follows. When using the adjustable machine as a generator of stable frequency output current when changing the frequency of rotation of the drive turbine, the turbine drives a generator rotor. The second rotor winding is made short, and the second armature winding 3 is connected to the capacitor 12, and therefore in the winding 3 navedatsa EMF and the input of the frequency Converter 13 will receive the AC voltage. The frequency Converter 13 converts the electric power frequency current of the second armature winding 3 in the desired value of the control frequency fyand submits it to the stator winding 2 of the main magnetic circuit and n is th current flows in the excitation frequency "f y".

Under the action of the excitation current in the main magnet 1 generates a rotating electromagnetic field of frequency fy". This electromagnetic field can rotate relative to the rotor counter or under. In this case, the electromagnetic field generates in the first winding 2 of a rotor of the electric power frequency current according to the expression:

where

p1the number of pairs of poles of the first winding AC

ntthe rotational speed of the drive turbine.

The value of the frequency control sets the output of the Converter such that regardless of the current value of the turbine speed "nt" frequency output current "fn" had a constant value. Since the first winding of the main magnetic circuit is tightly connected to the secondary of the toroidal windings 8 additional magnetic circuit 7, the primary toroidal windings will be transformed current of the same frequency fn"=const and fed through the generator output terminals 11 to the electricity consumer.

The advantages of the proposed solution compared to the prototype are to reduce the size of the machinery while improving cooling and ventilation.

Asynchronous adjustable machine that contains the core is infoprod of stator and rotor slots and the first windings of the alternating current, additional magnetic core with toroidal windings of the alternating current on the rotor and the stator output terminals, a second armature winding on the stator and a second winding of the inductor on the rotor, with the unit of the frequency Converter connecting the first and second stator winding, characterized in that the second armature winding is made combined, placed in the slots of the stator main magnetic circuit and provided with a capacitor, the second winding of the inductor is made of a combined, multi-phase, squirrel-cage and placed in the slots of the rotor core of the magnetic circuit.



 

Same patents:

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FIELD: electricity.

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Magnetic reducer // 2483419

FIELD: electricity.

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FIELD: electricity.

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FIELD: electricity.

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2 cl, 6 dwg

FIELD: electric engineering.

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1 dwg

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5 cl, 3 dwg

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Magnetic reducer // 2369955

FIELD: electric engineering.

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3 dwg

FIELD: electrical engineering.

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EFFECT: improvement of energy response and reliability of propulsion-transformer unit with simultaneous extension of its application area.

4 cl, 4 dwg

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