JP2002354749A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce tooth hammering noises caused by backlash between an inner gear and a planet gear in the power generating operation. SOLUTION: In the power generating operation by a rotating electric machine, continuous tooth surface separation by the inner gear 19 and the planet gear 15 is prevented to reduce the tooth hammering noises by continuously supplying power to the field coil 21 of an electromagnetic clutch to the extent the contact/ separate surface 22 of electromagnetic clutch driving body and the electromagnetic clutch follower 23 are not connected each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine capable of operating a motor and a generator.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing a conventional rotary electric machine. In FIG. 2, a rotary electric machine having a structure of a winding type synchronous machine will be described as an example. In addition, what has structures, such as a permanent magnet type synchronous machine, a reluctance type synchronous machine, a cage type induction machine, and a winding type induction machine, may be sufficient. In the drawing, reference numeral 51 denotes a pulley which is installed at one end so as to be able to transmit bidirectional power to the engine; 52, a rotor shaft to which the pulley 51 is fixed; 53, a rotor core fixed to the rotor shaft 52; Are field windings wound around the rotor core 53. The rotor shaft 52, the rotor core 53,
The field winding 54 forms a rotor. Numeral 55 denotes a stator core arranged opposite to the rotor, and 56 denotes a multi-phase stator winding wound around the stator core 55. The stator is constituted by the stator core 55 and the stator winding 56. Have been.

[0005] 57 and 58 are a pair of bearings for supporting the rotor, 59 is a bracket for supporting the stator, 60 is a slip ring for supplying current to the field winding 54, and 61 is a slip ring. A pair of brushes 62 slidingly in contact with the ring 60
And 63, a brush holder for accommodating them.

Next, the operation will be described. When an exciting current is supplied to the field winding 54 via the brush 61 and the slip ring 60, a magnetic flux is generated in the rotor core 53. During operation of the motor, in this state, a rotating force is generated in the rotor by supplying a multi-phase AC current to the multi-phase stator winding 56. At the same time, by energizing the electromagnetic clutch field coil 64 and attracting the electromagnetic clutch follower 65 to the electromagnetic clutch main body contact / separation surface 66, the internal gear 67 in the planetary gear mechanism is fixed.

Therefore, the rotational force generated by the rotor is transmitted from the rotor to a sun gear 68, a planetary gear 69, a carrier 70, a pulley 51, and a belt wound around the pulley 51 (a poly V belt as a rotational force transmitting means). , A toothed belt, a chain or the like may be used).
As described above, by having the speed reduction mechanism inside, the electric motor can be rotated at a high speed, and the pulley 51 as the output unit can generate a rotational force proportional to the reduction ratio.

In this case, the one-way clutch drive 71 is
The one-way clutch follower 72 idles. When power is supplied to the electric load by the generator operation, the brush 61,
An exciting current is supplied to the field winding 54 via the slip ring 60, and a rotational force is transmitted to the rotor by the pulley 51 while a magnetic flux is generated in the rotor core 53.

After the motor operation is completed, the energization of the electromagnetic clutch field coil 64 is cut off, and the internal gear 67 and the yoke 73 become free, so that they rotate at the same rotation speed as that of the pulley 51. Since the rotor also rotates, electric power is generated in the multi-phase stator winding 56. in this case,
The one-way clutch driving body 71 and the driven body 72 are connected.

[0008]

Since the conventional rotating electric machine is configured as described above, during the power generation operation,
As described above, the torque is not applied to the internal gear 67 and the yoke 73, and the yoke 73 is free. Therefore, the internal gear 67 and the yoke 73 are driven by the pulley 51 formed integrally with the carrier 70 having the planetary gear shaft 74 and rotate together. At this time, rattling noise is generated due to backlash existing between the internal gear 67 and the planetary gear 69. Since the vehicle engine is operated in a cycle of intake → compression → explosion → exhaust, there is a torque ripple (rotational fluctuation) due to the explosion, and the engine rotation speed is not constant and the acceleration / deceleration is constantly repeated. There is a problem that the rattling noise is more remarkably generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the rattle noise by preventing continuous separation of the tooth surfaces of the internal gear and the planetary gear. And

[0010]

According to a first aspect of the present invention, there is provided a rotating electric machine comprising: a pulley installed at one end thereof so as to be able to transmit bidirectional power to an engine; a rotor shaft to which the pulley is fixed;
A rotor fixed to the rotor shaft, a stator disposed opposite to the rotor, a sun gear formed on the rotor shaft, a planetary gear meshed with the sun gear, and meshed with the planetary gear; An electromagnetic clutch having an internal gear and a driving body and a driven body, a field coil disposed in the electromagnetic clutch, and a one-way clutch formed on a rotor shaft. During the power generating operation of the rotating electric machine, a current is continuously supplied to the field coil within a range in which the driving body and the driven body of the electromagnetic clutch are not joined.

A rotary electric machine according to a second aspect of the present invention employs a rotary electric machine for a vehicle for the purpose of starting an engine by a motor operation and supplying electric power to a vehicle electric load by a generator operation. It is.

According to a third aspect of the present invention, there is provided a rotating electric machine in which a current is continuously supplied to a field coil only when an engine is idling.

A rotating electric machine according to a fourth aspect of the present invention continuously supplies a current to the field coil only when the rotation speed of the engine changes.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a rotating electric machine according to Embodiment 1 of the present invention. In the present embodiment, a rotating electric machine having a structure of a winding type synchronous machine will be described as an example. It may have a structure such as a reluctance type synchronous machine, a cage type induction machine, and a winding type induction machine. In the drawing, reference numeral 1 denotes a pulley which is installed at one end so as to be capable of bidirectional power transmission with an engine, 2 denotes a rotor shaft to which the pulley 1 is fixed, 3
Is a rotor core fixed to the rotor shaft 2, and 4 is a field winding wound around the rotor core 3. The rotor shaft 2, the rotor core 3, the field winding 4 constitutes a rotor. Reference numeral 5 denotes a stator core arranged opposite to the rotor, and reference numeral 6 denotes a multi-phase stator winding wound around the stator core 5. The stator is constituted by the stator core 5 and the stator winding 6. Have been.

7, 8 are a pair of bearings for supporting the rotor, 9 is a bracket for supporting the stator,
10 is a slip ring for supplying a current to the field winding 4, 11 is a pair of brushes slidingly contacting the slip ring 10, 12 is a spring for pressing the brush 11 against the slip ring 10, and 13 is a brush holder containing these. It is.

Reference numeral 14 denotes a sun gear in the planetary gear mechanism provided on the rotor shaft 2, reference numeral 15 denotes a planetary gear meshing with the sun gear 14, reference numeral 16 denotes a planetary gear shaft, and reference numeral 17 denotes a bearing for supporting the planetary gear 15. , 18 are U-shaped cross-sections, 19 is an internal gear which is a part of the planetary gear mechanism formed in the yoke 18, 20 is an electromagnetic clutch main body, and 21 is arranged to be wrapped in the yoke 18. A field coil 22 of the electromagnetic clutch to be driven, a contact / separation surface 22 of an electromagnetic clutch driving body constituting a part of the electromagnetic clutch body, and an electromagnetic force 23 attracted to the contact / separation surface 22 by energizing the field coil 21. A clutch follower, 24 is a spring for returning the electromagnetic clutch follower 23, and 25 is a screw for fixing the electromagnetic clutch.

Reference numeral 26 denotes a screw for fixing a spring 24 for returning the electromagnetic clutch follower 23,
27 is a bearing for supporting the yoke 18, 28 and 29 are respective spacers, 30 is a bracket, 31 is an oil seal for preventing oil from leaking, and 32 is a rotor shaft 2
A one-way clutch follower capable of transmitting one-way rotational force, 33 is a one-way clutch driver, 34 is a one-way clutch cam portion, 35 is a one-way clutch fixing nut,
35 is a nut for fixing the one-way clutch, 36 is a bearing for supporting the one-way clutch wedge portion, 37 is a power transmission means for the engine such as the pulley 1 and the like, and a carrier constituting the one-way clutch driving body 33, 38 is Fixing means for fixing the pulley 1 and the carrier 37, 39 is a portion configured to be able to engage the sun gear 14 provided on the rotor shaft 2 and the one-way clutch follower 32, and 40 is a component for fixing each component. It is a fixing means for carrying out.

Next, the operation will be described. When an exciting current is supplied to the field winding 4 via the brush 11 and the slip ring 10, a magnetic flux is generated in the rotor core 3. During operation of the motor, in this state, a multi-phase AC current is supplied to the multi-phase stator winding 6 to generate a torque in the rotor. At the same time, the electromagnetic clutch field coil 21 is energized,
The electromagnetic clutch follower 23 is moved to the electromagnetic clutch body contact / separation surface 22.
To the internal gear 1 in the planetary gear mechanism.
9 is fixed.

Therefore, the rotational force generated by the rotor is transmitted from the rotor to the sun gear 14, the planetary gear 15, the carrier 37, the pulley 1, and the belt wound around the pulley 1 (poly-V belt as a means for transmitting the rotational force). Power may be transmitted to the load via a toothed belt or a chain. As described above, by having the speed reduction mechanism inside, the electric motor can be rotated at high speed, and the pulley 1 as the output portion can generate a rotational force proportional to the speed reduction ratio.

In this case, the one-way clutch driving body 33 is
The idling operation is performed on the one-way clutch follower 32. When power is supplied to the electric load by the operation of the generator, the brush 11,
An exciting current is supplied to the field winding 4 via the slip ring 10, and a rotational force is transmitted to the rotor by the pulley 1 while a magnetic flux is generated in the rotor core 3.

After the operation of the motor is completed, the energization of the electromagnetic clutch field coil 21 is cut off, and the internal gear 19 and the yoke 18 become free, so that they rotate at the same rotation speed as the pulley 1. Since the rotor also rotates, electric power is generated in the multi-phase stator winding 6. In this case, the one-way clutch driving body 33 and the driven body 32 are connected. In the present invention, during the power generation operation, a field current is continuously supplied to the field coil 21 of the electromagnetic clutch within a range in which the contact / separation surface 22 of the electromagnetic clutch driver and the electromagnetic clutch follower 23 are not joined.

That is, the electromagnetic clutch is opened (when OFF)
In this state, power is transmitted from the engine via the pulley 1 to the rotor, and power is generated in the multi-phase stator winding 6 wound around the stator core 5. At this time, the internal gear 19 formed in the yoke 18 does not contribute to torque transmission and is in a free state, so that the carrier 3 having the planetary gear shaft 16 is free.
The gear 7 rotates together with the pulley 1 having an integral structure, and rattling noise due to backlash existing between the internal gear 19 and the planetary gear 15 is generated.

In this case, the field coil 2 of the electromagnetic clutch
First, the movement of the yoke 18 having the internal gear 19 is regulated by utilizing the electromagnetic attraction generated by the continuous application of the field current, thereby preventing the continuous separation of the tooth surface between the internal gear 19 and the planetary gear 15. By doing so, the rattling noise can be reduced. Since the electromagnetic clutch follower 23 is supported by the spring 24, if the electromagnetic attraction force is Fm, and the spring force (threshold) required for joining the electromagnetic clutch is F, Fm <Fm in this operation. A field current that satisfies F will flow.

Further, as the rotating electric machine as described above, a rotating electric machine for a vehicle for the purpose of starting the engine by the operation of a motor and supplying electric power to a vehicle electric load by the operation of a generator can be employed.

Embodiment 2 The structure of the rotating electric machine itself is shown in FIG.
However, in the present embodiment,
A period in which a field current is continuously supplied to the field coil 21 of the electromagnetic clutch is characterized in that the engine is only operated during IDL (idling) operation. The torque ripple of the engine is greatest during IDL operation.
Since there is no generation of wind noise and the like, the rattling noise is particularly conspicuous, so that the significance of flowing a field current to the field coil 21 is significant. . Furthermore, by limiting the energizing period to only the IDL period, the amount of electric power taken out of the vehicle is reduced, so that the charge / discharge balance is improved and the amount of heat generated by energizing the field coil 21 is reduced. The resulting insulation life is extended.

Embodiment 3 The structure of the rotating electric machine itself is shown in FIG.
However, in the present embodiment,
The period in which the field current is continuously applied to the field coil 21 of the electromagnetic clutch is a case where the engine rotation speed changes, such as during acceleration or deceleration. During acceleration / deceleration, pulley 1
The internal gear 19 and the planetary gear 1
Since a shocking force acts between the five, the generated rattling noise also increases. In addition, since the amount of power taken out of the vehicle is reduced by limiting the energization period, the charge / discharge balance is improved, and the amount of heat generated by energization of the field coil 21 is reduced. Is extended.

[0027]

According to the rotating electric machine according to the first aspect of the present invention, a pulley installed at one end so as to be able to transmit bidirectional power to the engine, a rotor shaft to which the pulley is fixed, and this rotor shaft , A stator disposed opposite to the rotor, a sun gear formed on the rotor shaft, a planetary gear meshing with the sun gear, and an internal gear meshing with the planetary gear. An electromagnetic clutch having a driving body and a driven body, a field coil disposed in the electromagnetic clutch, and a one-way clutch formed on a rotor shaft. During the power generation operation, the current is continuously supplied to the field coil within a range in which the driving body and the driven body of the electromagnetic clutch are not joined, so that rattling noise can be reduced.

According to the rotating electric machine according to a second aspect of the present invention, as the rotating electric machine, starting of the engine by the operation of the electric motor;
Since the vehicular rotating electric machine is used to supply electric power to the vehicular electric load by the operation of the generator, noise can be effectively reduced during operation of the vehicle.

According to the rotating electric machine according to the third aspect of the present invention, current is continuously supplied to the field coil only when the engine is idling, so that the power consumption is reduced and the charge / discharge balance is improved. At the same time, the amount of heat generated by energizing the field coil is reduced, and thermal degradation can be prevented.

According to the rotating electric machine of the fourth aspect of the present invention, current is continuously supplied to the field coil only when the rotational speed of the engine changes, so that the power consumption is reduced and the charge / discharge balance is reduced. And the amount of heat generated by energization of the field coil is reduced, and thermal degradation can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rotating electric machine according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view illustrating a conventional rotating electric machine.

[Explanation of symbols]

1 pulley, 2 rotor shaft, 14 sun gear, 15 planetary gear, 19 internal gear, 21 field coil, 23 electromagnetic clutch follower.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J057 AA01 GA01 GE18 5H590 AA06 CA07 CA23 CC01 CC18 CC24 GA05 5H607 AA04 BB01 BB02 BB14 CC01 CC03 DD01 DD02 DD03 DD17 EE04 EE05 EE28 EE33 EE36 FF22 FF24

Claims (4)

[Claims] 1. A pulley installed at one end so as to be capable of bidirectional power transmission with an engine, a rotor shaft to which the pulley is fixed,
A rotor fixed to the rotor shaft, a stator arranged opposite to the rotor, a sun gear formed on the rotor shaft, a planetary gear meshing with the sun gear, and a planetary gear A rotating electric machine including an electromagnetic clutch having an internal gear meshed with the driving body and the driven body, a field coil disposed in the electromagnetic clutch, and a one-way clutch formed on the rotor shaft; A rotating electric machine characterized by continuously supplying a current to the field coil within a range in which a driving body and a driven body of the electromagnetic clutch are not joined during a power generating operation of the rotating electric machine. 2. The rotating electric machine according to claim 1, wherein the rotating electric machine employs a rotating electric machine for a vehicle for the purpose of starting an engine by an operation of a motor and supplying electric power to a load of the vehicle electric machine by an operation of a generator. Electric machine. 3. The rotating electric machine according to claim 1, wherein a current is continuously supplied to the field coil only during an idling operation of the engine. 4. The rotating electric machine according to claim 1, wherein a current is continuously supplied to the field coil only when the rotation speed of the engine changes.