RU2525847C2 - Synchronous generator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electrical engineering. The proposed synchronous generator is designed for power characteristics of up to 1.5 kW/kg, higher efficiency factor of up to 95%, output voltage of 220/380 V and output frequency of f = 700 Hz. Separation of generating windings along the shaft in each section in the proposed generator makes it possible to increase the number of poles in the stator and the rotor. The proposed synchronous generator comprises a salient-pole stator with anchor winding and a rotor with poles that alternate in direction of the magnetic field. At the same time according to the first version of realisation the generator comprises N-sections arranged along the shaft, in each of which there is its section of the rotor and the stator with the anchor winding, each winding of the section covers all poles of the stator of its section, the rotor of each section is displaced relative to the adjacent one by 1/N period of alternation of the magnetic poles of the rotor. According to the second version of realisation, in the proposed synchronous generator the active sections of the anchor winding laid in slots between poles are made of steel plates, ends of which are connected by separate wires with ends of the plates of the adjacent slot in a mirror-like-symmetric manner relative to the pole between them.

EFFECT: increased output capacity of a synchronous generator with preservation of its dimensions.

2 cl, 3 dwg

Description

The invention relates to electrical engineering. Synchronous type generators are known where current is generated by rotating the rotor magnetic field. A rotor usually has two or four magnetic poles. The stator and rotor are clearly polar.

To obtain a three-phase current, the windings of such generators are shifted from each other in a circle through 120 °. This makes it impossible to increase the number of generator poles operating simultaneously. The windings of the generators are made of copper, which reduces the magnetic conductivity of the stator (patent No. 2170487 Russia).

The purpose of the invention is to increase the output power of the generator without changing the size.

This goal is achieved by the fact that one stator winding covers all pairs of poles of one of the stator sectors, due to which they all simultaneously participate in generation. There is the possibility of increasing the number of poles and, as a consequence, the growth of the emf due to the increase in the total length of the emf-forming sections of the winding and the growth of ΔФ / Δt, where ΔФ is the change in the magnetic field for Δt is the time of rotation of the rotor through the angle Δφ (10 ° for figure 2). In order to prevent the demagnetization of the rotor during rotation of a multi-pole rotor with multidirectional magnetic flux while passing the poles past the emf-forming sections of the stator winding, it is proposed to make these sections from enameled iron plates. These plates will be connected to the circuit of one winding. To eliminate eddy currents, the ends of the plates of the neighboring emf-forming sections are interconnected: the nearest with the near, the far with the far - that is, mirror symmetrically relative to the pole between them (figure 3). To obtain a three-phase current, the work of the three above-described rotor sections, shifted from each other by 1/3 of the alternating period of the magnetic poles of the rotor, is necessary. The winding can be loop, as in the description, parallel - any, it is important that when the rotor rotates, the emf will be induced immediately in the entire winding of each section. The number of sections (N) can be any. The rotor may be of hard magnetic material, with an excitation winding.

Figure 1 shows a longitudinal section of the generator, where 1 - stator sections, 2 - three rotor sections, offset from each other by 1/3 of the angle between the poles of the rotor with the same direction of the magnetic field.

Figure 2 is a section across the axis of the generator, where 1 is the stator, 2 is the rotor, 3 is the rotor winding (shown without fixing elements), 21 is the output shaft. Count poles - 18, stroke - 10 - rotation of the rotor, in which the magnetic flux through the armature winding drops to zero.

Figure 3 shows the interconnection of the emf-forming sections of the winding 31, made of iron plates, wires 32.

Claims (2)

1. A synchronous generator containing an explicit pole stator with an anchor winding, a rotor with alternating poles in the direction of the magnetic field, characterized in that:
the generator consists of N-sections located along the shaft, each of which has its own section of the rotor and stator with an anchor winding, each winding of the section covers all the poles of the stator of its section, the rotor of each section is shifted relative to the alternating period of the magnetic poles of the rotor . 2. A synchronous generator of N-phase current, comprising an explicit pole stator with an armature winding, a rotor with poles alternating in the direction of the magnetic field, characterized in that:
the active sections of the anchor winding, laid in the grooves between the poles, are made of iron plates, the ends of which are connected by separate wires to the ends of the plates of the adjacent groove mirror symmetrically relative to the pole between them.

Images