JPS58159647A - Generator - Google Patents

Abstract

PURPOSE:To obtain sufficient cooling air in a low speed range by rotatably mounting a cooling fan having an inductive squirrel-cage element on a rotational shaft, and mounting an inductor connected to a 3-phase armature coils to a stationary frame and having the prescribed number of poles. CONSTITUTION:3-phase armature coils 1b are mounted on a stationary frame 2, a rotor 5 opposed to the stator 1 is mounted on the shaft 3 supported rotatably to the frame 2, and a cooling fan 7 is rotatably mounted through a bearing 10 on the shaft 3. An inductive element 14 of an electromagnetic yoke having a squirrel-cage conductor 14a is mounted on the inside of the fan 7, and an inductor 13 of electromagnetic yoke having 3-phase exciting coils 13a connected to the phases of the 3-phase armature coils 1b and less number of poles than that of the rotor 5 is mounted on the outside of the frame 2 opposed to the element 14. In this manner, the rotation of the fan 7 can be increased faster than the rotation of the shaft 3 in the low speed range.

Description

[Detailed Description of the Invention] The invention relates to a generator used in a vehicle generator, etc. For example, in a blood car, this dual-purpose generator is driven by an engine and supplies the generated power to a battery or a load. It is provided. Fig. 1 shows an example of a conventional vehicle generator, in which 1 is a three-phase armature winding wound around a solid leg core 1a and an iron core 1a attached to a bracket (fixed frame) 2 having a ventilation hole 2af. 3 is a rotary shaft rotatably supported by the bracket 2 via a bearing 4; 5 is a rotor core 5a attached to the rotor shaft 3; and a field winding attached thereto. 5b, the rotor 5 has a plurality of magnetic poles and is connected to the stator 1 through a minute interval in the radial direction.
to face. 6 (a pulley fixed to the rotating shaft 3; 7 a cooling fan fixed to the rotating shaft 3 integrally with the pulley 6;
8 is a voltage regulator that keeps the output voltage of the armature winding 1b constant; 9 is a voltage regulator for alternating current output t induced in the armature winding 1b; 1. It is a vessel.

In the dual-purpose generator with the above configuration, when the engine starts, the rotating shaft 3 rotates through the sheath IJ6'i, which rotates the rotor 5, which induces a butterfly three-phase AC voltage in the armature winding lb. be done. 1itIt for this AC voltage,
It is rectified by the regulator 9 and maintained at a constant value by the pressure regulator, and is supplied to the pantry or load without any distortion. On the other hand, the cooling fan 7 also rotates around the rotating shaft 3 and R1, and the cooling air 7 flows through the inside of the generator through the ventilation hole 2a' to completely cool the generator. The housing is stiffer than the rotating connection of the cooling fan 7, and in the region where the engine rotation speed is low (the rotation speed of the cooling fan 7 is also low, there is sufficient cooling air), and the generator is able to handle the temperature rise. Therefore, it was not possible to downsize the generator.Therefore, we considered reducing the rotation ratio of the generator to the engine speed.
%, but in this case, the number of cooling air leaves increases in the low speed range, but in addition, the rotation speed of the cooling fan 7 becomes excessive in the series-〇, and the noise becomes louder. occured.

Is this because of the drawbacks mentioned above? A vehicle generator shown in FIG. 2 has been proposed as a conventional device to solve this problem.

In this example, the cooling fan 7 is rotatably supported via a bearing 10, and an inductor 11 of an electromagnetic joint made of a permanent magnet is mounted on the outer surface I!8i of the cooling fan 7.
Double &5 in a circumferential manner so that adjacent magnetic poles have different polarities! Individually installed, on the inner surface 1lll of the father 1-reel 6, the inductor 12i of the electromagnetic joint made of a magnetic plate has a minute spacing from the inductor 11 in the direction of use.
Install them so that they are facing each other. In this case, the inductor 11 completely forms a rotating magnetic field with respect to the induced element 12, and as a result, the inductor 11 and the broken #j element 12 are electromagnetically coupled to form the entire electromagnetic joint.

Therefore, when the pulley 6 rotates from the rotation VC of the en-fan, F's, the cooling fan 7 follows the pulley 6, and as the rotation speed increases by -F, the wind pressure applied to the cooling fan 7 gradually increases. ↑, - The torque of the magnetic viscosity and the torque due to the wind pressure match 7 R9 [Dehen] The fan 7 rotates at a constant speed. In this way, since the cooling fan 7 does not exceed a certain rotational speed, it is possible to completely reduce the noise in the high speed range of the engine, but in the low speed range of the engine, it is possible to completely reduce the noise.
It is impossible to obtain the same WLi′ as the one with C, and the cooling effect of light cannot be obtained. Also, inductor 11? The permanent magnets formed had to be quite large in order to obtain the magnetic field necessary for electromagnetic joints, and electromagnetic joints became larger.

The present invention has been made in order to eliminate all of the above-mentioned drawbacks of the conventional technology, and its object is to provide a generator that can provide sufficient cooling air even at low speeds and reduce noise during bi-serial operation. purpose.

The following is a dual use version 1 according to the present invention! An embodiment of the machine will be explained with reference to all the drawings. In Figures 3 to 5, 7 is a cooling fan rotatably supported via a co-rotating @3VC bearing 10'fc;
13 is an inductor of a plurality of electromagnetic joints fixed to the outside of the bracket 2 in a circumferential manner, and the inductor 13 and τ are electrical pre-winding@
A three-phase excitation winding 15a connected to each phase of lb is wound. The number of poles of the inductor 13 is made smaller than the number of poles of the rotor 5. Reference numeral 14 denotes a temporary inductor of a cage-shaped electromagnetic joint that is attached to the circular surface of the cooling fan 7 so as to be aligned with the inductor 13 in the radial direction with a minute gap 111. The conductor portion 14a is composed of the iron core portion 14b.

Further, 15 is a battery, and 16 is a switch. Other configurations are similar to FIG. 1 and 1bI.

The vehicle generator of this embodiment is configured as described above, and when the pulley 6 rotates due to the rotation of the ennon, the rotor 5
rotates, and a three-phase alternating current is generated in the armature winding 1b. The synchronous speed Nl matches the rotational speed of the rotor 5, and the rotor 5
When the number of poles is kP+, the synchronous frequency fli is given by the following equation.

f[Hz] ... (1) 20 Also, since the three-phase excitation winding 13a is connected to each phase of the electric machine pre-winding +1i91b, its synchronous frequency is f[Hz'
:l, and if the number of poles of the inductor 13 is R2 and the synchronous speed is N, then f-Gokarisha [Hz] 120° (2). Therefore, from the formula fil, f2i, P, -5P, N, ... (a+
The following relationship is obtained. That is, for example, if the number of poles of stator 1 is 12
Assuming that the total number of poles and the number of poles of the inductor 13 is 4, the rotating magnetic field generated in the inductor 13 rotates at a synchronous speed that is three times the rotation speed of the rotor 50, and as a result, the inductor 14 generates the full torque. Rotate. In the low speed range of the Ennon, that is, the low speed range of the generator, the torque of the cooling fan 7 due to wind pressure is small, so although there is some slippage, the cooling fan 7 rotates at approximately the same speed as the synchronous speed of the inductor 13, and the rotation of the rotor 5. It rotates at about three times the rotational speed. For this reason, an air volume approximately three times greater than that of the conventional system can be obtained. Furthermore, when the rotational speed of the rotor 5 increases and the rotational speed of the cooling fan 7 increases, the wind pressure received by the cooling fan 7 increases, and when the torque due to the wind pressure matches the torque of the induced element 14, the rotational speed of the cooling fan 7 increases. becomes constant. Therefore, even if the rotor 5 rotates at the fourth speed, the noise of the cooling fan will not exceed one foot. Further, by making the inductor 14 cage-shaped, the electromagnetic joint can be made compact and efficient.

In the above embodiment T, the inductor 14 is attached to the cooling fan 7, but the cooling fan 7 and the conductor portion 1 of the inductor 14 are
4ai aluminum or the like, and the iron core portion 14bi may be attached to this. Further, the present invention can be applied to generators other than those for vehicles.

As described above, in the generator of the present invention, the cooling fan is rotatably attached to the rotor, and the three-phase excitation windings are firmly connected to each phase of the armature winding. An inductor with a small number of poles is installed, and a cage-shaped rust-conducting inductor is attached to the cooling fan, and the rotating magnetic field of the inductor is a multiple of the ratio of the number of poles between the rotor and the inductor, and rotates faster than the inductor. Rotate. Therefore, in the low speed range of the generator, the cooling fan rotates several times faster than the generator, providing a large amount of cooling and increasing the cooling effect, making it possible to downsize the generator and increase output. . Furthermore, in the case of a high-speed generator, the rotational speed of the cooling fan does not exceed a certain value due to the torque caused by the wind EEE, so noise can also be suppressed to below the normal level. Further, the rotation speed of the cooling fan can be freely selected by changing the rotation speed and the ratio of the number of poles of the inductor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional vehicle generator, FIG. 2 is a sectional view of another conventional vehicle generator, and FIGS. 3 and 4 are sectional views of a blood and meat generator Km according to the present invention. That l-11!
The sectional view and FIG. 5 are electrical connection diagrams of the vehicle generator according to the present invention. DESCRIPTION OF SYMBOLS 1... Stator, 1b... Armature winding, 2... Bracket, 3... Rotating shaft, 5... Rotor, 5b... Field winding. 7...Cooling fan, 13...Inductor, 13a A three-phase excitation winding, 14...Induced element. Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 2 2) Figure 3

Claims (1)

[Claims] (1) A stator that is attached to a fixed frame and has an electric pre-winding at that generates an AC output, a rotating shaft that is rotatably supported by the fixed frame, and a stator that is attached to the rotating shaft opposite to the stator and has a field A rotor having windings, a cooling fan rotatably supported on a rotating shaft, and E-phase excitation windings attached to a fixed frame and connected to each phase of the armature winding, respectively. A generator characterized by having an inductor of an electromagnetic joint with a small number of poles and an inductor of an electromagnetic joint mounted opposite to the inductor on a cooling fan.