CN214177010U - Brushless excitation generator adopting three-phase alternating current armature winding exciter stator - Google Patents
Brushless excitation generator adopting three-phase alternating current armature winding exciter stator Download PDFInfo
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- CN214177010U CN214177010U CN202120178061.2U CN202120178061U CN214177010U CN 214177010 U CN214177010 U CN 214177010U CN 202120178061 U CN202120178061 U CN 202120178061U CN 214177010 U CN214177010 U CN 214177010U
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Abstract
The utility model discloses an adopt brushless excitation generator of three-phase alternating current armature winding exciter stator, including the exciter, all inlayed three-phase alternating current winding on the stator of exciter and the rotor, and the three-phase alternating current winding on the exciter stator is connected with the three-phase alternating current winding electricity on the generator stator and is formed stator alternating current rotating magnetic field, and the exciter rotor is rotatory with the opposite direction of stator alternating current rotating magnetic field. The utility model discloses a change the excitation mode for the generator of this exciter need not to be equipped with automatic voltage regulator, can maintain unloaded to full-load output voltage, and steady state voltage regulation rate can reach within 5%, can bear 5 times rated current's motor starting current when starting asynchronous motor, and will keep generator output voltage to be rated voltage's 65% or higher under starting the transient state condition, the asynchronous motor load that this exciter's design is particularly suitable for the area to carry and starts.
Description
Technical Field
The utility model belongs to the technical field of the generator, concretely design an adopt brushless excitation generator of three-phase alternating current armature winding exciter stator.
Background
The brushless excitation generator is composed of a main generator stator, a three-phase AC winding exciter stator, a rotary three-phase armature type exciter rotor coaxial with the main generator rotor, and a rectifying device fixed on a rotary rectifying disc coaxial with the main generator rotor. The working principle is that AC voltage and current are provided for the exciting winding of the exciter on the stator to generate a rotating exciting magnetic field, the three-phase winding of the rotor armature of the exciter generates AC power, and the AC power is rectified and then supplied to the rotor exciting winding of the main generator, so that the main generator induces the required AC power in the three-phase winding of the stator.
The existing conventional exciter is usually provided with a direct current winding embedded on a stator core of the exciter, a three-phase alternating current winding embedded on a rotor core, a stator coil is utilized to generate a magnetic field with fixed polarity through direct current, when the rotor rotates, a coil on the rotor cuts a magnetic line of force of the magnetic field with fixed polarity generated by the stator coil to generate induction voltage, and the excitation mode needs to be additionally provided with an external automatic voltage regulator to detect and correct output voltage, so that the structure is complex.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model discloses an aim at provides an adopt brushless excitation generator of three-phase alternating current armature winding exciter stator, and this brushless generator need not to be equipped with automatic voltage regulator in addition, realizes simple structure, improves the current bearing rate.
The utility model discloses a following technical scheme realizes:
the brushless excitation generator adopting the three-phase alternating current armature winding exciter stator comprises an exciter and is characterized in that three-phase alternating current windings consisting of three-phase alternating current coils are embedded on the exciter stator and a rotor, the three-phase alternating current windings on the exciter stator are electrically connected with the three-phase alternating current windings on the generator stator to generate an exciter stator alternating current rotating magnetic field, and the exciter rotor rotates in a direction opposite to the stator alternating current rotating magnetic field.
Further, each alternating current coil on the exciter stator is two independent windings which are respectively a parallel winding and a series winding.
Further, the parallel winding is connected with a three-phase winding of a main stator of the generator in parallel; the series winding is connected with the three-phase winding of the generator stator in series.
Further, a three-phase ac winding on the exciter stator is formed by the primary coil, and a three-phase ac winding on the exciter rotor is formed by the secondary coil.
Further, the parallel winding and the series winding on the exciter rotor and the exciter stator jointly induce a voltage which is rectified by a three-phase full-wave rotating rectifier into a direct current output which is used as the field current of the generator and directly input into the rotor field winding.
Further, U1, V1, W1 of U phase, V phase and W phase of the three-phase alternating current winding in the generator stator are external lead terminals.
Further, U4-U5, V4-V5, W4-W5 of the U phase, V phase and W phase of the three-phase alternating current winding in the exciter stator are external lead terminals.
The utility model discloses a change the excitation mode for the generator of this exciter need not to be equipped with automatic voltage regulator, can maintain unloaded to full-load output voltage, and steady state voltage regulation rate can reach within 5%, can bear 5 times rated current's motor starting current when starting asynchronous motor, and will keep generator output voltage to be rated voltage's 65% or higher under starting the transient state condition, the asynchronous motor load that this exciter's design is particularly suitable for the area to carry and starts. In addition, the generator can bear fault current with the same intensity, so that when the fault is eliminated, an additional excitation supporting system is not needed.
Drawings
Fig. 1 is a wiring diagram of the excitation structure of the present invention, wherein a is a wiring diagram of the excitation structure of the generator stator, and b is a wiring diagram of the excitation structure of the exciter stator;
FIG. 2 is a schematic view of the exciter of the present invention;
in the figure, 1-exciter, 2-exciter stator, 3-exciter rotor, 4-primary coil, 5-secondary coil.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings for better understanding of the technical solution.
As shown in fig. 1-2, the present invention relates to a brushless exciter generator using a three-phase ac armature winding exciter stator, wherein the exciter stator and the rotor both use three-phase ac armature windings, and three-phase ac windings composed of three-phase ac coils are respectively embedded on the stator and the rotor core, and there is no dc current having a magnetic field with fixed polarity, and the exciter essentially is a primary winding and a secondary winding of a rotating current, frequency converter (transformer). The exciter stator winding is communicated with a three-phase alternating current winding of a generator stator, so that a three-phase alternating current flows through an exciter stator coil, a rotating magnetic field is generated in the clockwise direction or the anticlockwise direction, an exciter rotor rotates in the direction opposite to the magnetic field of the exciter stator, a rotating magnetic field magnetic line generated by the alternating current flowing through the three-phase coil of the exciter stator is cut, three-phase induction voltage is generated in the three-phase coil of the exciter rotor, and then the three-phase induction voltage is rectified into direct current output through a three-phase bridge rectifier and supplied to a generator rotor excitation coil to generate a main magnetic field.
In the technical scheme, the direction of an alternating-current rotating magnetic field of an exciter stator and the rotating direction of an exciter rotor must be opposite, otherwise, a winding of the exciter rotor does not cut a magnetic line of force, and no induction voltage is generated, which is similar to that of an asynchronous induction motor in that the rotor torque is not generated at the synchronous rotating speed. In order to enable the generator to have compound excitation characteristics and improve the voltage regulation rate and other performances of the generator, each phase coil of an exciter stator is designed into two independent windings: a parallel winding and a series winding. The parallel exciter winding is connected with the three-phase winding of the generator stator in parallel to provide a magnetic field required by no-load excitation. The exciter stator series winding is connected with the generator stator winding in series, and the series winding flows through all load current and has the function of providing load composite excitation characteristics.
The three-phase exciter rotor is used as the secondary of an integrated rotary current transformer, the voltage is induced according to a certain proportion with the sum of the currents flowing in a parallel winding and a series winding of an exciter stator, the induced voltage is rectified into direct current output through a three-phase full-wave rotary rectifier, and the direct current output is directly input into a rotor field winding as the exciting current of a generator.
The generator using the exciter can maintain the output voltage from no load to full load without an automatic voltage regulator, the steady state voltage regulation rate can reach +/-5%, the generator can bear 5 times of the starting current of the motor when starting the asynchronous motor, the starting current is about twice of the starting current of the brushless generator with the conventional exciter and the automatic voltage regulator, the output voltage of the generator can be kept to be 65% or higher of the rated voltage under the starting transient condition, and the exciter is particularly suitable for the load of the asynchronous motor which is started with load. In addition, the generator can bear the same intensity of fault current, so that when the fault is eliminated, an additional excitation support system is not needed, for example, an exciter stator current is increased, a series voltage is boosted or an automatic voltage regulator is used like a conventional brushless generator.
Due to the design characteristics of the exciter, i.e. no external automatic voltage regulator is needed to detect and correct the output voltage, the generator will produce a voltage-frequency proportional characteristic of V/f as a function of the speed of rotation. This V/f characteristic will cause the load motor to follow the change in generator speed without stalling when the generator speed changes. This function of the generator can be used to control the speed of the load motor, typically by varying the speed of the generator prime mover, without the need for a frequency converter.
In the 400V internal connection diagram in fig. 1, a U3 interface of the generator stator and a U3 interface of the exciter stator, a V3 interface of the generator electronics and a V3 interface of the exciter stator, and a W3 interface of the generator electronics and a W3 interface of the exciter stator respectively form a series winding; a U2 interface of generator electronics and a U2 interface of an exciter stator, a V2 interface of generator electronics and a V2 interface of the exciter stator, and a W2 interface of the generator electronics and a W2 interface of the exciter stator respectively form parallel windings; in the 400V external lead diagram, U1, V1, and W1 of the U phase, V phase, and W phase of the three-phase ac winding in the generator stator are external lead terminals, and U4-U5, V4-V5, and W4-W5 of the U phase, V phase, and W phase of the three-phase ac winding in the exciter stator are external lead terminals.
Claims (7)
1. A brushless excitation generator adopting a three-phase alternating current armature winding exciter stator comprises an exciter (1) and is characterized in that a three-phase alternating current winding consisting of three-phase alternating current coils is embedded in both an exciter stator (2) and an exciter rotor (3) of the exciter (1), the three-phase alternating current winding on the exciter stator (2) is electrically connected with the three-phase alternating current winding on the generator stator to generate an exciter stator alternating current rotating magnetic field, and the exciter rotor (3) rotates in a direction opposite to the stator alternating current rotating magnetic field.
2. A brushless exciter generator using a three-phase ac armature winding exciter stator according to claim 1, characterised in that each ac winding on the exciter stator (2) is provided with two separate windings, a parallel winding and a series winding.
3. A brushless excitation generator employing a three-phase ac armature winding exciter stator according to claim 2, wherein the parallel windings are connected in parallel with the generator main stator three-phase windings; the series winding is connected with the three-phase winding of the generator stator in series.
4. A brushless exciter generator using a three-phase ac armature winding exciter stator according to claim 1, characterised in that the three-phase ac winding on the exciter stator (2) is formed by the primary winding (4) and the three-phase ac winding on the exciter rotor (3) is formed by the secondary winding (5).
5. A brushless exciter generator using a three phase ac armature winding exciter stator according to claim 2, characterised in that the exciter rotor (3) in combination with the parallel and series windings on the exciter stator (2) induces a voltage which is rectified by a three phase full wave rotating rectifier into a dc output for direct input to the rotor field windings as the generator's field current.
6. A brushless exciter generator using a three-phase ac armature winding exciter stator according to claim 1, wherein U1, V1, W1 of U phase, V phase and W phase of the three-phase ac winding in the generator stator are external lead terminals.
7. A brushless exciter generator using a three-phase ac armature winding exciter stator according to claim 1, characterised in that U4-U5, V4-V5, W4-W5 of the U phase, V phase and W phase of the three-phase ac winding in the exciter stator (2) are external lead terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178061.2U CN214177010U (en) | 2021-01-22 | 2021-01-22 | Brushless excitation generator adopting three-phase alternating current armature winding exciter stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178061.2U CN214177010U (en) | 2021-01-22 | 2021-01-22 | Brushless excitation generator adopting three-phase alternating current armature winding exciter stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214177010U true CN214177010U (en) | 2021-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120178061.2U Active CN214177010U (en) | 2021-01-22 | 2021-01-22 | Brushless excitation generator adopting three-phase alternating current armature winding exciter stator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214177010U (en) |
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2021
- 2021-01-22 CN CN202120178061.2U patent/CN214177010U/en active Active
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