JPH06327227A - Electromagnetic retarder - Google Patents

Abstract

PURPOSE:To prevent drop of brightness of a lamp due to voltage drop during the running at the night by mounting a rotor to a rotating body and a stator to a bracket to supply the generated power of the stator to a plurality of electromagnets through a commutator. CONSTITUTION:A bracket 1 is composed of a cylindrical circumferential wall portion 11 which is larger in diameter than an internal circumferential wall portion 33 of a rotating body 3 and a ring shaped bottom portion 12 formed at an aperture end portion of such cylindrical circumferential wall portion 11 and an electromagnet 2 is provided projected, in the plural number, in the same pitch at the external circumferential surface of the circumferential wall portion 11 of the bracket 1 and is also provided opposed to the internal circumfetential portion 31 of the rotating body 3 keeping a certain gap therebetween. Moreover, a rotor 4 is formed of a permanent magnet and is attached to an internal bottom portion 34 of the rotating body 34. A stator 5 is formed of a stator core 51 and a stator coil 52 and is provided opposed to the rotor at the bottom portion 12 of the bracket 1. As a result, a current is not supplied to a coil formed of an electromagnet from a battery and brightness of lamp is not dropped even the electromagnetic retarder is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic retarder having a dedicated power supply device.

[0002]

2. Description of the Related Art In an electromagnetic retarder, a plurality of electromagnets are arranged on the outer peripheral surface of a bracket of a non-rotating body, and a rotating body, which is a ferromagnetic body, is arranged outside the plurality of electromagnets with a gap therebetween. The magnetic flux generated by is cut by the rotating body to obtain a braking force by the eddy current generated in the rotating body. Then, a current is supplied from the battery to the coil forming the electromagnet.

[0003]

In this prior art, since the coil is connected to the battery, which is the only power source in the vehicle, if the electromagnetic retarder is used during night driving, the brightness of the lamp will be momentarily decreased due to the voltage drop. May decrease. In this case, there is a problem that the driver may feel anxious and nervous, and may hinder safe driving.

The present invention has been made for the purpose of solving the problems of the prior art.

[0005]

[Means for Solving the Problems] Means for solving the above problems will be described below with reference to FIGS. According to the present invention, a plurality of electromagnets 2 are arranged on the outer peripheral surface of a non-rotating body bracket 1, a rotating body 3 which is a ferromagnetic body is arranged outside the plurality of electromagnets 2 with a gap, and a rotor 4 is attached to the rotating body 3. The stator 5 is attached to the bracket 1, and the electric power generated by the stator 5 is supplied to the plurality of electromagnets 2 through the rectifier.

[0006]

With the above-described structure, no current is supplied from the battery to the coil forming the electromagnet 2.

[0007]

1 and 2 show an embodiment of the present invention. 1 and 2, 1 is a non-rotating body bracket,
2 is an electromagnet, 3 is a rotating body that is a ferromagnetic body, 4 is a rotor,
5 is a stator.

The rotating body 3 has a cylindrical outer peripheral wall portion 31 and a ring-shaped outer bottom surface portion 3 formed at an opening end of the outer peripheral wall portion 31.
2 and the outer peripheral wall portion 31 formed on the inner peripheral portion of the outer bottom surface portion 32.
And a ring-shaped inner bottom surface portion 34 formed in an intermediate portion of the inner peripheral wall portion 33. On the outer peripheral surface of the outer peripheral wall portion 31, a plurality of thin plate ring-shaped fins 6 are provided at the same pitch.

The bracket 1 includes an inner peripheral wall portion 33 of the rotating body 3.
It is composed of a cylindrical peripheral wall portion 11 having a larger diameter and a ring-shaped bottom surface portion 12 formed at the open end of the peripheral wall portion 11.

A plurality of electromagnets 2 are projected on the outer peripheral surface of the peripheral wall portion 11 of the bracket 1 at the same pitch and face the inner peripheral surface of the outer peripheral wall portion 31 of the rotating body 3 with a gap. The electromagnet 2 is composed of a core 21 and a coil 22.

The rotor 4 is composed of a permanent magnet and is attached to the inner bottom surface portion 34 of the rotating body 3. Stator 5
Is composed of a stator core 51 and a stator coil 52, and is attached to the bottom surface portion 12 of the bracket 1 so as to face the rotor 4. Three sets of stator coils 52 are wound around the stator core 51, and when the rotor 4 rotates,
Three-phase alternating current occurs. This is converted into a direct current through a rectifying device (not shown) attached to the bracket 1, and is supplied only to the coil 22 of the electromagnet 2 through a switch or the like.

In the above, the rotor 4 and the stator 5 are the rotating body 3
In the case where the rotor 4 is attached to the inner bottom surface portion 34 of the rotor 1 and the bottom surface portion 12 of the bracket 1, the rotor 4 is attached to the inner peripheral surface of the inner peripheral wall portion 33 of the rotating body 3 as shown in FIGS. 5 may be attached to the outer peripheral surface of the cylindrical inner peripheral wall portion 13 protruding from the bottom surface portion 12 of the bracket 1 to the inner bottom surface portion 34 side of the rotating body 3 so as to face the rotor 4.

[0013]

As described above, the present invention is
A plurality of electromagnets are arranged on the outer peripheral surface of the bracket of the non-rotating body, a rotating body that is a ferromagnetic body is arranged outside the plurality of electromagnets with a gap, a rotor is attached to the rotating body, and a stator is attached to the bracket. It is mounted, and the generated electric power of the stator is supplied through the rectifiers of the plurality of electromagnets. Therefore, no current is supplied from the battery to the coil that constitutes the electromagnet, and the brightness of the lamp does not decrease even when the electromagnetic retarder is used during nighttime driving. Therefore, according to the present invention, it is possible to obtain the effect of eliminating the anxiety and tension associated with the decrease in brightness, and eliminating the fear of hindering safe driving.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a one-side omitted view seen from the XX direction in FIG.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a one side omitted view seen from the YY direction of FIG.

[Explanation of symbols]

 1 bracket 2 electromagnet 3 rotating body 4 rotor 5 stator

Claims (3)

[Claims] 1. A plurality of electromagnets are arranged on an outer peripheral surface of a bracket of a non-rotating body, a rotating body that is a ferromagnetic body is arranged outside the plurality of electromagnets with a gap, and a rotor is attached to the rotating body. An electromagnetic retarder in which a stator is attached to the bracket and electric power generated by the stator is supplied to the plurality of electromagnets via a rectifier. 2. The electromagnetic retarder according to claim 1, wherein the rotor is attached to an inner bottom surface of the rotating body, and the stator is attached to the bottom surface of the bracket so as to face the rotor. 3. A rotor is attached to an inner peripheral surface of an inner peripheral wall portion of the rotating body, and a cylindrical shape is provided so as to project from a bottom surface portion of the bracket toward an inner bottom surface portion of the rotating body. The electromagnetic retarder according to claim 1, wherein a stator is attached to the outer peripheral surface of the inner peripheral wall portion so as to face the rotor.