CN207868889U - A kind of structure stator of impulse generator - Google Patents

Abstract

A structural stator of a pulse generator, which includes a stator winding, the stator winding includes a main armature winding, a secondary armature winding and an excitation winding, the stator winding is stacked and fixed on the stator yoke, and the stator yoke is fixed inside the generator casing , The main armature winding is a four-pole 120° phase with a single-phase connection structure. The utility model can solve the problem that when the existing generator operates in the pulse mode of the induction generator, the transient active and reactive power required by the load is relatively large, and neither the single winding nor the excitation winding can provide the required power in time. The voltage drop at the output terminal is an inevitable technical problem.

Description

A structural stator of a pulse generator

technical field

The utility model belongs to the field of electric power systems, in particular to a structural stator of a pulse generator.

Background technique

The stator structure of induction generator usually has single winding, double winding and other forms. When the single-winding stator induction generator is running with load, the air-gap flux will attenuate due to the demagnetization effect of the armature reaction. If the reactive capacity required by the load exceeds the reactive capacity that the generator system can provide, the winding The terminal voltage will drop or even oscillate close to zero. The induction generator in the form of double winding has two structures: one is that the pole pairs of the two sets of stator windings are not equal, and it is used when the doubly-fed motor is used for variable speed operation. The other is that the pole pairs of the two sets of stator windings are the same, one set of windings is used as a conventional armature winding, and the other set of windings is used as an excitation winding, which dynamically provides the system with corresponding reactive power following changes in the load's demand for reactive power. Reactive power compensation capacity. However, when the induction generator operates in pulse mode, the transient active and reactive power required by the load is large, and neither the single winding nor the excitation winding can provide the required power in time, so the voltage drop at the output terminal is inevitable. If the winding inductance, which is the internal resistance of the power supply, can be reduced when the load is discharged, then the required pulse current amplitude can still be obtained on the load.

Contents of the invention

The technical problem to be solved by the utility model is to provide a structural stator of a pulse generator, which can solve the problem that the transient active and reactive power required by the load is relatively large when the existing generator operates in the pulse mode of the induction generator. Neither the single winding nor the excitation winding can provide the required power in time, so the voltage drop at the output terminal is an inevitable technical problem.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A structural stator of a pulse generator, which includes a stator winding, the stator winding includes a main armature winding, a secondary armature winding and an excitation winding, the stator winding is stacked and fixed on the stator yoke, and the stator yoke is fixed inside the generator casing , The main armature winding is a four-pole 120° phase with a single-phase connection structure.

The aforementioned stator yoke is a glass fiber stator yoke.

Above-mentioned generator casing is steel casing.

A total of three sets of stator windings are included.

The above-mentioned excitation winding adopts a double-layer short-pitch structure, which is a four-pole 60° phase belt Y-shaped connection structure.

The above-mentioned secondary armature winding adopts a double-layer short-pitch structure, which is a four-pole 60° phase belt Y-shaped connection structure.

The coil phase distributions of the secondary armature winding and the field winding are consistent.

The above-mentioned main armature winding is a flat copper wire winding structure.

Both the inductance and the number of turns of the single-turn coil of the primary armature winding are smaller than those of the secondary armature winding.

The utility model has the following technical effects:

This patent designs a set of excitation control system for the stator of the pulse generator, so that it can dynamically follow the power demand to provide appropriate excitation power when the motor starts and runs in a steady state. The structure of the pulse generator stator and its excitation system design Fully considering the requirements of stator parameters under various working conditions of the motor, the designed three-winding form is conducive to the optimization of system efficiency. Although the volume occupied by the third winding is larger than that of ordinary double windings, the stator and rotor cores are omitted. , commutator and other components, the overall energy storage density has been improved, and the performance is stable and reliable, with great practical value.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the field winding and the secondary armature winding coil potential vector diagram in the utility model;

Fig. 3 is the potential vector diagram of main armature winding coil in the utility model;

Fig. 4 is a working principle diagram of the excitation system in the utility model.

Detailed ways

A structural stator of a pulse generator. The structural stator design of the pulse generator is shown in Figure 1. It is composed of three sets of stator windings: the main armature winding, the secondary armature winding and the excitation winding. Inductance, in addition to taking magnetic flux shielding measures, the motor is also designed as an air-core structure. The three sets of stator windings are directly stacked and fixed on the stator yoke made of non-magnetic glass fiber winding, and the stator yoke is bonded and fixed inside the steel casing with a certain conductivity. The excitation winding is arranged closest to the stator yoke. In order to increase the magnetomotive force of the motor’s starting excitation, the winding is designed as a double-layer short-pitch structure, with four-pole 60° phase and Y-shaped connection. In order to increase the excitation magnetomotive force, the secondary armature winding also adopts a double-layer short-pitch structure, which is also a four-pole 60° phase belt Y-shaped connection, and the coil phase distribution of the two windings is consistent. The main armature winding is made of flat copper wire. The inductance and number of turns of the single-turn coil are smaller than that of the secondary armature winding. In order to increase the discharge current amplitude, it is designed as a four-pole 120° phase belt single-phase connection. Three sets of winding induced electromotive force vectors are shown in Figure 2 and Figure 3.

With the above structure, when in use, the working principle of the new structure stator and its excitation system of the induction pulse generator is shown in Figure 4. Generally, when the induction motor self-excites and builds voltage, it needs residual magnetism in the rotor iron core, and the rotor is driven by the prime mover to generate initial alternating magnetic flux in the stator armature, thereby triggering the excitation process of self-excited oscillation. But for this solution, in order to reduce the output inductance, the air-core design is adopted, and there is no iron core on the rotor, which requires the system to provide an additional initial excitation potential for the stator winding. For this reason, the field winding and the secondary armature winding are arranged in a tightly coupled form. When the motor is started, the prime mover drags the rotor to start to accelerate, and the field winding is supplied with a field current with a constant amplitude. The steady-state magnetic field generated will not induce field magnetomotive force in the secondary armature winding, but can be induced in the metal shielding sleeve of the rotor. The eddy current is induced on the surface of the cylinder, and the frequency of the induced eddy current is proportional to the rotor speed at a certain moment. The alternating eddy current acts as the initial magnetic flux to excite the secondary armature winding to generate self-excited induced electromotive force, further self-excited oscillation through the process of positive feedback, and finally stabilizes at the frequency determined by the inductance parameter of the secondary armature winding and its parallel capacitance value. When the frequency of the induced electromotive force of the secondary armature winding is close to the stable value, the output current on the field winding is controlled, and the induced voltage of the primary and secondary armature windings reaches the rated value as a symbolic condition for the end of the control. The main armature winding is always in an open circuit state during the starting process of the motor, and does not participate in the process of self-excited oscillation.

Claims (9)

1. A structural stator of a pulse generator, which includes a stator winding, characterized in that: the stator winding includes a main armature winding (1), a secondary armature winding (2) and an excitation winding (3), and the stator windings are stacked The stator yoke (4) is fixed on the stator yoke (4), and the stator yoke (4) is fixed inside the generator casing (5). The main armature winding (1) is a four-pole 120° phase belt single-phase wiring structure. 2. The structural stator of the pulse generator according to claim 1, characterized in that: the stator yoke (4) is a glass fiber stator yoke. 3. The structural stator of the pulse generator according to claim 1, characterized in that: the generator casing (5) is a steel casing. 4. The structural stator of the pulse generator according to claim 1, characterized in that it comprises three sets of stator windings. 5. The structural stator of the pulse generator according to claim 4, characterized in that: the excitation winding (3) adopts a double-layer short-pitch structure, which is a four-pole 60° phase belt Y-shaped connection structure. 6. The structural stator of the pulse generator according to claim 4 or 5, characterized in that: the secondary armature winding (2) adopts a double-layer short-pitch structure, which is a four-pole 60° phase belt Y-shaped connection structure . 7. The structural stator of the pulse generator according to claim 6, characterized in that: the coil phase distribution of the secondary armature winding (2) and the field winding (3) are consistent. 8. The structural stator of a pulse generator according to claim 4, wherein the main armature winding is a flat copper wire winding structure. 9. The structural stator of the pulse generator according to claim 8, characterized in that: the inductance and the number of turns of the single-turn coil of the primary armature winding (1) are smaller than those of the secondary armature winding (2).