JP2008029173A - Eddy current reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eddy current reduction gear in which external power supply can be reduced. <P>SOLUTION: An eddy current reduction gear 1 comprising a conductor rotor 31 provided on a rotary shaft 2, a brake side annular body 7 provided on the radial outside of the conductor rotor 31, and a permanent magnet 8 provided on the brake side annular body 7 is further provided with a non magnetic body rotor 32 arranged in the rotary shaft 2, a plurality of pole pieces 33 provided on the nonmagnetic body rotor 32, a yoke 4 provided on the radial inside of the nonmagnetic body rotor 32, a plurality of permanent magnets 41 provided on the yoke 4, a power generation side annular body 5 provided on the opposite side of the yoke 4, a plurality of cores 51 and conductive coils 52 provided in the power generation side annular body 5, and a means 9 for switching the conductive coil 52 of the power generation side annular body 5 between a brake mode for connecting it electrically with the conductive coil 82 of the electromagnet 8 in the brake side annular body 7 and a nonbrake mode for interrupting the conductive coil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an eddy current reduction device that can brake a rotating shaft with an eddy current and can generate power by the rotation of the rotating shaft.

  Conventionally, an eddy current brake (eddy current reduction device) using an eddy current is known.

  As shown in FIG. 11, the eddy current brake uses a braking force 135 generated by the interaction between the eddy current 133 generated by the mutual movement of the magnet 131 and the conductor (rotor) 132 and the magnetic field 134 from the magnet 131. Thus, the conductor 132 is decelerated. Here, the magnet 131 for generating the magnetic field 134 includes a permanent magnet and an electromagnet (see Patent Document 1).

  For example, in an electromagnet retarder, braking / non-braking of the retarder is switched by switching energization / non-energization to the electromagnet.

JP 2002-291224 A

  However, in order to obtain a large braking force, an electromagnet retarder requires a large current to flow through an electromagnet coil. Therefore, when an electromagnet retarder is mounted on a vehicle, it is necessary to increase battery capacity and power generation capacity. There was a problem of becoming.

  Accordingly, an object of the present invention is to provide an eddy current reduction device that can solve the above-described problems and can reduce power supply from the outside.

  In order to achieve the above object, the present invention provides a ring-shaped conductor rotor made of a conductor provided concentrically on a rotating shaft, and is positioned on the inside or outside in the radial direction of the conductor rotor so that the fixed side An electromagnet composed of a ring-shaped brake-side annular body provided on the core, a plurality of iron cores provided at intervals along the circumferential direction on the brake-side annular body, and conductive coils wound around the iron cores An eddy current reduction device comprising: a ring-shaped non-magnetic member made of a non-magnetic material provided on the rotating shaft concentrically with the rotating shaft and arranged in the axial direction with respect to the conductive rotor. A non-magnetic rotor, a plurality of pole pieces made of a magnetic material provided at intervals along the circumferential direction, and a radially inner side or outer side of the non-magnetic rotor on the fixed side. The provided ring-shaped yoke and its A plurality of permanent magnets provided on the yoke such that N poles and S poles alternate along the circumferential direction and each magnetic pole faces the nonmagnetic rotor, and the nonmagnetic rotor with respect to the yoke A power generation-side annular body provided on the fixed side, which is positioned on the opposite side in the radial direction, with a predetermined interval along the circumferential direction between the power-generation-side annular body and the non-magnetic rotor. A braking mode for electrically connecting a plurality of iron cores provided opposite to each other, conductive coils wound around these iron cores, and a conductive coil of the power generation side annular body to a conductive coil of the braking side annular body And a switching means for switching between the non-braking mode for cutting off the connection of the conductive coils.

  Preferably, the conductor rotor and the non-magnetic rotor are integrally formed by joining in the axial direction.

  In order to achieve the above object, the present invention provides a disk-shaped rotor provided concentrically on a rotating shaft, a conductor portion provided along the circumferential direction of the rotor, and an axial direction relative to the rotor. A plurality of iron cores arranged on the fixed side and arranged on the fixed side, spaced apart from each other along the circumferential direction of the stator and facing the conductor portion of the rotor, and wound around these iron cores An eddy current reduction device comprising an electromagnet composed of a conductive coil, and a magnetic body provided at intervals along the circumferential direction on the radially inner side or outer side of the conductor portion of the rotor A plurality of pole pieces, a non-magnetic body portion provided between adjacent pole pieces, and a distance from the stator along the circumferential direction, and facing the pole piece of the rotor. A plurality of power generation cores, a power generation conductive coil wound around these power generation cores, and a yoke provided on the fixed side, positioned on the opposite side in the axial direction across the rotor with respect to the stator A plurality of permanent magnets provided on the yoke so that N poles and S poles alternate along the circumferential direction, with each magnetic pole facing the pole piece of the rotor, and the power generating conductive coil. Switching means for switching between a braking mode in which the electromagnet is electrically connected to the conductive coil and a non-braking mode in which the conductive coil is disconnected is provided.

  According to the present invention, an excellent effect that power supply from the outside can be reduced is exhibited.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[First embodiment]
The eddy current reduction device (retarder) of this embodiment is applied to, for example, an auxiliary brake of a vehicle, and applies a braking force to an output shaft (rotary shaft) of the transmission.

  First, the schematic structure of the eddy current reduction device according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1 and FIG. 2, the eddy current reduction device 1 includes a rotating shaft 2 (see FIG. 5), a ring-shaped conductor rotor 31 provided concentrically on the rotating shaft 2, and its conductivity. A ring-shaped braking-side annular body 7 provided on the stationary side and positioned on the outer side in the radial direction of the body rotor 31; and a ring-shaped non-magnetic rotor 32 provided side by side in the axial direction with respect to the conductor rotor 31; The ring-shaped yoke 4 provided on the fixed side and positioned on the radially inner side of the non-magnetic rotor 32, and the power generation-side annular body 5 provided on the radially outer side of the yoke 4 and the non-magnetic rotor 32 And switching means 9 for switching between the braking mode and the non-braking mode.

  As shown in FIGS. 3 and 4, in the present embodiment, the conductor rotor 31 and the nonmagnetic rotor 32 are integrally formed by joining in the axial direction to form an integral rotor 3. That is, the rotor 3 includes a highly conductive portion 31 (conductive rotor) made of a highly conductive material (regardless of magnetic and nonmagnetic) and a nonmagnetic portion made of a nonmagnetic material (whether nonmetallic or metal). 32 (nonmagnetic rotor) and a composite material joined together.

  The rotor 3 has a cylindrical shape extending in the axial direction of the rotary shaft 2 and is concentrically attached to the rotary shaft 2 by a support material (for example, a spoke-shaped support material) not shown.

  As a good conductive material (conductor) constituting the good conductor portion 31, a material having strength that can withstand rotation and low electrical resistance so that eddy currents are easily generated, such as copper, aluminum, Low carbon steel can be considered.

  As the non-magnetic material (non-magnetic material) constituting the non-magnetic body portion 32, a material having strength that can withstand rotation and high electrical resistance that does not easily generate eddy current is used. For example, stainless steel or brass is used. Conceivable.

  The non-magnetic body portion 32 is provided with a plurality of pole pieces 33 made of a magnetic material (magnetic body) (for example, iron).

  Specifically, the pole pieces 33 are embedded in the nonmagnetic body portion 32 at regular intervals in the circumferential direction and exposed from the outer peripheral surface and the inner peripheral surface of the nonmagnetic body portion 32. In the present embodiment, the same number of pole pieces 33 of the nonmagnetic body portion 32 as the permanent magnets 41 of the yoke 4 (and the coil cores 51 of the power generation side annular body 5) which will be described later are provided. Between the pole pieces 33, a magnetic shielding part 34 made of a nonmagnetic material constituting the nonmagnetic part 32 itself is located.

  The magnetic material of the pole piece 33 is preferably a material having a high magnetic permeability so that the magnetic flux of the permanent magnet 41 of the yoke 4 passes through the coil core 51 of the power generation-side annular body 5 as much as possible, and electric so that eddy currents are not easily generated. A material having high resistance (such as an insulator or a semiconductor) is preferable. For example, as the magnetic material of the pole piece 33, a laminated steel plate can be considered.

  The brake-side annular body 7 is attached concentrically to the rotating shaft 2 and attached to a case (not shown). The braking-side annular body 7 of the present embodiment is formed to have substantially the same diameter as the power generation-side annular body 5 and is made of a magnetic material.

  The brake-side annular body is provided with a plurality of electromagnets 8 at intervals along the circumferential direction.

  As shown in FIG. 5, the electromagnet 8 includes a plurality of coil cores 81 provided at predetermined intervals along the circumferential direction on the brake-side annular body 7, and conductive coils wound around the coil cores 81 ( (Hereinafter referred to as a retarder coil) 82.

  The coil iron cores 81 are formed at equal intervals along the inner peripheral surface of the braking-side annular body 7 and project radially inward from the inner peripheral surface. The retarder coil 82 is formed by winding an electric wire around each coil core 81. Each retarder coil 82 is connected to a connection line 91 of the switching means 9 described later.

  Electric power is supplied to the electromagnet 8 configured as described above so that N poles and S poles are alternated along the circumferential direction when energized.

  Returning to FIGS. 1 and 2, the ring-shaped yoke 4 is attached to a case (not shown) concentrically with the rotating shaft 2. The yoke 4 of this embodiment is supported so as to be movable along the axial direction of the rotary shaft 2 by a yoke support member 61 (see FIG. 6) described later. The yoke 4 is made of a magnetic material.

  The yoke 4 is provided with a plurality of permanent magnets 41 such that N poles and S poles alternate along the circumferential direction, with each magnetic pole facing the inner peripheral surface of the rotor 3.

  Specifically, the permanent magnet 41 is equidistant from the yoke 4 so that one of the magnetic poles protrudes radially outward (rotor 3 side) and the other magnetic pole contacts the outer peripheral surface of the yoke 4. It is attached.

  The power generation-side annular body 5 is positioned concentrically with the rotating shaft 2 and attached to a case (not shown). The power generation side annular body 5 is made of a magnetic material.

  The power generation-side annular body 5 includes a plurality of coil iron cores 51 (iron cores) at predetermined intervals along the circumferential direction, and conductive coils (hereinafter referred to as power generation coils) 52 wound around the coil iron cores 51. Provided.

  Specifically, the coil iron core 51 is formed at equal intervals along the inner peripheral surface of the power generation-side annular body 5 and protrudes radially inward from the inner peripheral surface. In the present embodiment, the same number of coil cores 51 as the permanent magnets 41 of the yoke 4 are provided, and are arranged at circumferential positions corresponding to the permanent magnets 41.

  The power generating coil 52 is formed by winding all the coil cores 51 with a single electric wire, for example, and the power generating coil 52 is connected to a vehicle battery or the like.

  In the present embodiment, yoke moving means 6 for reciprocating the yoke 4 along the axial direction of the rotary shaft 2 is provided.

  The yoke moving means 6 is attached to one end of the yoke 4 in the axial direction, and is extendable and contractible in the axial direction. The yoke support 61 is slidably in contact with the inner peripheral surface of the yoke 4 and supports the yoke 4 so as to be movable in the axial direction. An air cylinder (not shown).

  The yoke moving means 6 expands and contracts the air cylinder to reciprocate the yoke 4 along the axial direction (left and right direction in FIGS. 1 and 2), so that the permanent magnet 41 of the yoke 4 is connected to the rotor 3. A power generation position (braking position) opposed to the inner peripheral surface of the non-magnetic body portion 32 and a non-power generation position (non-braking position) separated from the entire rotor 3 in the axial direction (to the right of the rotor 3 in FIG. 1). Switch with.

  The switching means 9 includes a connection line (electric circuit) 91 that electrically connects the power generation coil 52 of the power generation side annular body 5 to the retarder coil 82 of the braking side annular body 7, and the amount of current flowing through the connection line 91. A current adjusting device 92 for adjusting. The connection line 91 is connected to a battery or the like in order to collect surplus power.

  In the present embodiment, the good conductor portion 31 of the rotor 3 and the electromagnet 8 of the braking side annular body 7 constitute a braking portion (left side in FIG. 1) that applies a deceleration force to the rotating shaft 2, and the permanent magnet 41 of the yoke 4. The non-magnetic part 32 of the rotor 3 and the power generation coil 52 and the coil core 51 of the power generation side annular body 5 constitute a power generation part (right side in FIG. 1).

  Next, the operation of the eddy current reduction device 1 of this embodiment will be described.

  The eddy current reduction device 1 of the present embodiment generates power by the non-magnetic body portion 32 of the rotor 3 and the power generation coil 52 and the coil core 51 of the power generation side annular body 5 during braking, and the generated power is used. This is supplied to the electromagnet 8 of the brake-side annular body 7 via the switching means 9, and the eddy current is generated in the good conductor portion 31 by the magnetic flux of the electromagnet 8 to decelerate the rotation of the rotating shaft 2.

  First, the eddy current reduction device 1 during braking will be described with reference to FIG.

  When the rotating shaft 2 rotates during braking, the magnetic flux passing through the coil core 51 of the power generation-side annular body 5 increases or decreases, and an electromotive force is generated in the power generation coil 52 to generate power.

  More specifically, as shown in FIG. 1, when the yoke 4 is arranged at the power generation position by the yoke moving means 6, the permanent magnet 41 of the yoke 4 is made of the non-magnetic body portion 32 (and the power generation side annular body 5). Located on the inner peripheral side, each magnetic pole faces the inner peripheral surface (the pole piece 33 and the magnetic shielding part 34) of the non-magnetic member 32.

  As shown in FIG. 6, when the pole piece 33 of the rotor 3 is positioned at the same circumferential position as the annular coil core 51 and the permanent magnet 41 of the yoke 4, the pole piece 33 from the N pole of the permanent magnet 41, A magnetic circuit C <b> 2 that passes through the coil iron core 51 and reaches the S pole of the yoke 4, the adjacent coil iron core 51, the pole piece 33, and the permanent magnet 41 is formed. At this time, the magnetic flux passing through the coil iron core 51 is maximized.

  When the rotor 3 rotates from the position shown in FIG. 6, the amount of magnetic flux passing through the coil core 51 through the pole piece 33 gradually decreases.

  As shown in FIG. 7, when the magnetic shielding part 34 of the rotor 3 is located at the same circumferential position as the annular magnet core 51 and the permanent magnet 41 of the yoke 4, the permanent magnet 41 is caused by the magnetic shielding part 34. From the N pole of the permanent magnet 41 to the S pole of the adjacent permanent magnet 41 through the pole piece 33 is formed. At this time, the magnetic flux passing through the coil iron core 51 is minimum (almost 0).

  When the rotor 3 rotates from the position shown in FIG. 7, the amount of magnetic flux that passes through the coil core 51 through the pole piece 33 gradually increases.

  As described above, in this embodiment, when the rotor 3 rotates, the magnetic flux passing through the coil core 51 increases or decreases, so that an electromotive force is generated in the power generation coil 52 and power generation is performed.

  Next, based on FIG. 8, the relationship between the rotation angle of the rotating shaft 2 (rotor 3), the voltage of the power generating coil 52, and the magnetic flux in the coil iron core 51 will be described.

  As an example, FIG. 8 shows a magnetic flux (indicated by a broken line M in FIG. 8) and an electromotive force (voltage) (voltage in FIG. 8) in the coil core 51 due to the rotation angle of the rotor 3 in the eddy current reduction device 1 having 12 poles. , Indicated by a solid line E). Here, the rotation angle when the pole piece 33 is located at the same circumferential position as the coil core 51 and the permanent magnet 41 is 0 degree, and shows up to 60 degrees.

  As shown in FIG. 8, at the rotation angles 0, 30 and 60 degrees (indicated by reference sign H in FIG. 8) where the pole piece 33 is located at the same circumferential position as the coil core 51 and the permanent magnet 41, the coil core 51. The magnetic flux inside becomes the maximum.

  On the other hand, at the rotation angle of 15 and 45 degrees (indicated by symbol L in FIG. 8) where the pole piece 33 is located at the intermediate position of the pole (permanent magnet 41), the magnetic flux in the coil core 51 is minimized.

  As described above, the magnetic flux in the coil iron core 51 changes depending on the rotation angle of the rotor 3, and an electromotive force corresponding to the amount of change is generated in the power generating coil 52 to generate power.

  The alternating current generated in the power generation coil 52 of the power generation side annular body 5 is rectified into a series current (DC current) by a diode in the current adjusting device 92 of the switching means 9 and supplied to the retarder coil 82. (Braking mode).

  As a result, as shown in FIG. 5, the electromagnet 8 of the braking-side annular body 7 is energized, and a magnetic circuit C <b> 1 is formed between the electromagnet 8 and the good conductor portion 31 of the rotor 3.

  Due to the magnetic flux of the magnetic circuit C1 and the rotation of the good conductor portion 31, an eddy current is generated in the good conductor portion 31, and the rotating shaft 2 is rotated in the good conductor portion 31 by the eddy current and the magnetic circuit C1. A braking force that decelerates is applied.

  In the present embodiment, the current adjusting device 92 controls the braking force applied to the rotor 3 by adjusting the amount of current supplied to the electromagnet 8. For example, when a large braking force is not required, the amount of current to the electromagnet 8 is reduced by the current adjusting device 92 of the switching means 9.

  Next, the eddy current reduction device 1 during non-braking will be described.

  At the time of non-braking, the connection line 91 of the switching means 9 is opened by a switch or the like, and the supply of electric power to the electromagnet 8 is cut off (non-braking mode). Therefore, no eddy current is generated in the good conductor portion 31 of the rotor 3, and no braking force is applied to the rotating shaft 2.

  Further, when the connection line 91 is opened, the power generation in the power generation coil 52 of the power generation side annular body 5 is stopped. In the present embodiment, the yoke 4 is further positioned at the non-power generation position in order to prevent the generation of drag torque.

  Thus, in this embodiment, it becomes possible to obtain a braking force with the electromagnet type retarder 80, without supplying electric power from the outside.

  Further, when a large braking force is not required, the power generated on the power generation unit side can be stored in a battery or the like, so that it can be used as a braking regeneration device.

  In addition, unlike the ordinary generator, the power generation unit of the eddy current reduction device 1 according to the present embodiment generates power without rotating the permanent magnet 41. Therefore, the permanent magnet 41 (power generation side annular body 5) is rotated. The structure can be easily configured to reduce the magnetic flux entering the coil iron core 51 by moving it in the axial direction of 2 and away from the coil iron core 51, thereby reducing cogging torque and loss when power generation is not required.

[Second Embodiment]
Next, a second embodiment will be described based on FIGS. 9 and 10. The present embodiment is different from the first embodiment in that the power generation unit and the braking unit are arranged side by side in the radial direction, and is otherwise the same as the first embodiment. Accordingly, the same elements as those in the first embodiment are designated by the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIGS. 9 and 10, the eddy current reduction device 10 according to the present embodiment includes a disk-shaped rotor 130 concentrically provided on the rotary shaft 2, and is fixed side by side in the axial direction with respect to the rotor 130. A ring-shaped stator 150 provided on the side, and a yoke 140 provided on the fixed side with the rotor 130 interposed between the stator 150 and the fixed side, and switching between a braking mode and a non-braking mode Switching means 9 for the purpose.

  The rotor 130 includes a rotor main body 131 fixed to the rotating shaft 2 and a ring-shaped conductor portion 31 (hereinafter referred to as a good conductor portion) provided along the circumferential direction on the outer peripheral portion of the rotor main body 131. Is done.

  The rotor body 131 has an insertion hole 132 through which the rotation shaft 2 is inserted at the center, and the rotor 130 is fixed to the rotation shaft 2 by fitting the rotation shaft 2 into the insertion hole 132.

  The rotor body 131 is provided with a plurality of pole pieces 33 made of a magnetic material (magnetic material) at predetermined intervals (equal intervals in the example in the figure) along the circumferential direction. A non-magnetic part (magnetic shielding part) 34 (see FIG. 10) is provided between each of them.

  The pole piece 33 is positioned on the radially inner side of the good conductor portion 31 and is exposed from both axial sides of the rotor body 131 and embedded in the rotor body 131. In the present embodiment, the pole pieces 33 are provided in the same number as the permanent magnets 41 (and the power generating cores 51 of the stator 150) of the yoke 140 described later.

  The stator 150 has a ring shape in which a through hole 151 through which the rotating shaft 2 passes is formed at the center, and has substantially the same outer diameter as the rotor 130 (good conductor portion 31).

  A plurality of electromagnets 8 are provided on the outer peripheral portion of the stator 150 at a predetermined interval (equal intervals in the illustrated example) in the circumferential direction. And a power generating conductive coil 52 wound around the power generating core 51 (hereinafter referred to as a power generating coil).

  The electromagnet 8 includes an iron core 81 (hereinafter referred to as a coil iron core) formed on an opposing surface (right side surface in FIG. 9) of the rotor 150 in the stator 150, and a conductive coil 82 (hereinafter referred to as a coil iron core) wound around the coil iron core 81. , Called a retarder coil). The coil iron core 81 protrudes from the stator 150 toward the rotor 130, and the tip thereof faces the good conductive portion 31 of the rotor 130.

  Electric power is supplied to the electromagnet 8 configured as described above so that N poles and S poles are alternated along the circumferential direction when energized.

  Similarly to the coil core 81 of the electromagnet 8, the power generation iron core 51 is formed at equal intervals in the circumferential direction, protrudes from the stator 150 toward the rotor 130, and the tip thereof faces the pole piece 33 of the rotor 130.

  In the present embodiment, the same number of coil cores 81 and power generation cores 51 of the electromagnet 8 are formed at the same circumferential position. The retarder coil 82 and the power generating coil 52 are electrically connected via a connection line 91 of the switching means 9.

  The yoke 140 has a ring shape in which a through hole 141 through which the rotary shaft 2 passes is formed at the center.

  A plurality of permanent magnets 41 are provided on the outer peripheral portion of the yoke 140 at predetermined intervals (equal intervals in the illustrated example) along the circumferential direction. The number of permanent magnets 41 of the present embodiment is the same as the number of pole pieces 33 of the rotor 130 (and the power generation core 51 of the stator 150).

  The permanent magnets 41 are provided such that one magnetic pole faces the pole piece 33 of the rotor 130 and the opposing magnetic poles alternate between the N pole and the S pole along the circumferential direction.

  In the present embodiment, yoke moving means (not shown) is provided for reciprocating the yoke 140 in the axial direction and between the power generation position close to the rotor 130 and the non-power generation position spaced apart from the yoke 140. It is done. As the yoke moving means, for example, a cylinder that can be expanded and contracted in the axial direction is conceivable.

  Also in the present embodiment, as in the first embodiment described above, during braking, the magnetic flux passing through the power generation core 51 increases and decreases due to the rotation of the rotating shaft 2, and an electromotive force is generated in the power generation coil 52. The electric power is supplied to the retarder coil 81, and a braking force by eddy current is applied to the rotating shaft 2. On the other hand, at the time of non-braking, the yoke 140 is separated from the rotor 130, and loss such as cogging torque is reduced.

  Thus, also in this embodiment, the same effect as the first embodiment can be obtained.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications and application examples can be considered.

  For example, in the first embodiment described above, the power generation side annular body 5 and the brake side annular body 7 are arranged on the outer peripheral side in the radial direction with respect to the rotor 3, and the yoke 4 is arranged on the inner peripheral side. 5 and the arrangement of the brake-side annular body 7 and the yoke 4 may be reversed on the inner and outer periphery.

  In the second embodiment, the braking portion is disposed on the outer peripheral side and the power generation unit is disposed on the inner peripheral side. However, the inner and outer peripheries may be reversed.

FIG. 1 is a cross-sectional view of an eddy current reduction device according to an embodiment of the present invention. FIG. 2 is a perspective view of the eddy current reduction device of the present embodiment. FIG. 3 is a perspective view of the rotor of the present embodiment. FIG. 4 is a view taken in the direction of the arrow IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 shows a state in which the rotor has rotated a predetermined angle from FIG. FIG. 8 is a diagram for explaining the relationship between the rotation angle of the rotor, the magnetic flux in the iron core, and the voltage of the coil. FIG. 9 is a cross-sectional view of an eddy current reduction device according to another embodiment. 10 is a view taken in the direction of the arrow X in FIG. FIG. 11 is a diagram for explaining a braking force due to an eddy current.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Eddy current reduction device 2 Rotating shaft 4 Yoke 5 Power generation side annular body 7 Braking side annular body 8 Electromagnet 9 Switching means 31 Conductor rotor 32 Nonmagnetic rotor 33 Pole piece 41 Permanent magnet 51 Iron core (core for power generation)
52 Conductive coil (Power generation coil)

Claims (3)

A ring-shaped conductor rotor made of a conductor concentrically provided on the rotating shaft, and a ring-shaped brake-side annular body provided on the fixed side, positioned on the inside or outside in the radial direction of the conductor rotor And an eddy current reduction device comprising a plurality of iron cores provided at intervals along the circumferential direction on the braking-side annular body and an electromagnet composed of conductive coils wound around these iron cores. A ring-shaped non-magnetic rotor made of a non-magnetic material provided on the rotating shaft concentrically with the rotating shaft and arranged in the axial direction with respect to the conductor rotor, and surrounding the non-magnetic rotor. A plurality of pole pieces made of a magnetic material provided at intervals along the direction;
A ring-shaped yoke provided on the fixed side and positioned on the inside or outside in the radial direction of the non-magnetic rotor, and N poles and S poles are alternately arranged along the circumferential direction of the yoke. A plurality of permanent magnets provided to face the non-magnetic rotor,
A power generation side annular body provided on the fixed side and positioned on the opposite side in the radial direction across the nonmagnetic rotor with respect to the yoke, and a predetermined interval along the circumferential direction of the power generation side annular body A plurality of iron cores provided to be spaced apart and opposed to the nonmagnetic rotor, and conductive coils wound around the iron cores;
And a switching means for switching between a braking mode for electrically connecting the conductive coil of the power generation side annular body to the conductive coil of the braking side annular body and a non-braking mode for disconnecting the connection of the conductive coils. An eddy current reduction device characterized by that.   The eddy current reduction device according to claim 1, wherein the conductor rotor and the nonmagnetic rotor are integrally formed by joining in an axial direction. A disc-shaped rotor concentrically provided on the rotating shaft, a conductor portion provided along the circumferential direction of the rotor, and a ring-like shape provided on the fixed side in the axial direction with respect to the rotor. An electromagnet composed of a stator, a plurality of iron cores provided on the stator so as to face the conductor portion of the rotor at intervals along the circumferential direction, and conductive coils wound around the iron cores; An eddy current reduction device comprising:
A plurality of pole pieces made of a magnetic material provided at intervals along the circumferential direction on the radially inner side or outer side of the conductor portion in the rotor, and a non-magnetic material provided between adjacent pole pieces. And
A plurality of power generation cores provided on the stator in a circumferential direction at intervals and facing the pole pieces of the rotor, and power generation conductive coils wound around the power generation cores,
A yoke provided on the fixed side that is positioned on the opposite side in the axial direction across the rotor with respect to the stator, and N poles and S poles are alternately arranged along the circumferential direction of the yoke, and A plurality of permanent magnets provided with the magnetic poles facing the pole piece of the rotor;
And switching means for switching between a braking mode for electrically connecting the power generating conductive coil to the conductive coil of the electromagnet and a non-braking mode for disconnecting the connection of the conductive coils. Eddy current reduction device.

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