WO2016024319A1

WO2016024319A1 - Vehicle braking system, rotating electrical machine, and vehicle

Info

Publication number: WO2016024319A1
Application number: PCT/JP2014/071198
Authority: WO
Inventors: 野中　剛; 隆明石井; 大戸　基道; 森本　進也; 荘平大賀
Original assignee: 株式会社安川電機
Priority date: 2014-08-11
Filing date: 2014-08-11
Publication date: 2016-02-18

Abstract

[Problem] To simplify the configuration and controls for a vehicle braking system or the like. [Solution] Provided is a vehicle braking system 100 installed in a vehicle C that is provided with a function for traveling using a rotating electrical machine 1, wherein in order to provide a parking brake function to the rotating electrical machine 1, the vehicle braking system includes: a variable field mechanism 50 that changes the field magnetic flux of the rotating electrical machine 1; a controller 52 that controls the variable field mechanism 50; and an operation member 51 that is operated to turn the parking brake function of the rotating electrical machine 1 ON or OFF.

Description

Vehicle brake system, rotating electrical machine, vehicle

The disclosed embodiment relates to a vehicle brake system, a rotating electrical machine, and a vehicle.

Patent Document 1 describes a brake device that is mounted on a hybrid vehicle and includes a regenerative brake mechanism, a hydraulic brake mechanism, and a parking brake.

JP 2013-193606 A

In the above prior art, since three types of brake systems are mounted on the vehicle, there is a problem that the configuration becomes complicated and the control for using them becomes complicated.

The present invention has been made in view of such problems, and an object thereof is to provide a vehicle brake system, a rotating electrical machine, and a vehicle that can simplify the configuration and control.

In order to solve the above-described problem, according to one aspect of the present invention, there is provided a vehicle brake system mounted on a vehicle having a function of traveling using a rotating electrical machine, and the rotating electrical machine has a parking brake function. A vehicle brake system having means and an operation member operated to turn on or off the parking brake function of the rotating electric machine is applied.

Further, according to another aspect of the present invention, a rotating electrical machine used for the vehicle brake system is applied.

Further, according to still another aspect of the present invention, a vehicle including the vehicle brake system is applied.

According to the present invention, the configuration and control of the vehicle brake system can be simplified.

It is explanatory drawing which represents notionally an example of a structure of the parking brake system which concerns on 1st Embodiment. It is an axial direction sectional view showing an example of composition of a rotary electric machine used for a parking brake system. FIG. 3 is a cross-sectional view of the rotating electrical machine taken along a line AA in FIG. 2. It is a perspective view showing an example of the structure of a shaft, a slider, and a hub. It is a perspective view showing an example of operation of a rotor when strengthening field magnetic flux. It is a perspective view showing an example of operation of a rotor when field magnetic flux is weakened. It is a graph showing an example of the relationship between the angular position of a rotation direction when a cogging torque of a rotor becomes the maximum, and a cogging torque ratio. It is a graph showing an example of the relationship between the angular position of a rotation direction when a cogging torque of a rotor becomes the minimum, and a cogging torque ratio. It is a perspective view showing an example of the state of the magnetic pole part of a rotor when the cogging torque of a rotor becomes the maximum. It is a perspective view showing an example of the state of the magnetic pole part of a rotor when the cogging torque of a rotor becomes the minimum. It is an axial direction sectional view showing typically an example of composition at the time of vehicles running of a rotating electrical machine concerning a 2nd embodiment. It is an axial sectional view showing typically an example of composition at the time of vehicles stopping and parking of a rotating electrical machine concerning a 2nd embodiment. It is a perspective view showing an example of composition of a brake board. It is a perspective view showing an example of composition of a counter load side plate. It is an axial direction sectional view showing typically an example of composition of a rotary electric machine concerning a 3rd embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the following, for convenience of description of the configuration of the rotating electrical machine and the like, directions such as up, down, left, and right may be used as appropriate, but the positional relationship of each configuration of the rotating electrical machine and the like is not limited.

<1. First Embodiment>
(1-1. Configuration of parking brake system)
An example of the configuration of the parking brake system 100 according to the first embodiment will be conceptually described with reference to FIG. As shown in FIG. 1, a parking brake system 100 (an example of a vehicle brake system) is mounted on a vehicle C. The vehicle C has a function of traveling using the rotating electrical machine 1 and is, for example, an electric vehicle (EV) or a hybrid vehicle (HEV). The parking brake system 100 includes a rotating electrical machine 1 having a parking brake function, and an operation member 51 that is operated to turn on or off the parking brake function of the rotating electrical machine 1. In FIG. 1, a lever is illustrated as an example of the operation member 51, but another member such as a pedal or a switch may be used. In FIG. 1, illustration of a brake system other than the parking brake is omitted.

The parking brake system 100 also includes a variable field mechanism 50 that varies the field magnetic flux of the rotating electrical machine 1 and a controller 52. The controller 52 outputs a control signal to the control motor 55 of the variable field mechanism 50 according to the operation of the operation member 51 to control the field magnetic flux of the rotating electrical machine 1. More specifically, the controller 52 controls the variable field mechanism 50 so that the field magnetic flux of the rotating electrical machine 1 is maximized when the operation member 51 is operated to turn on the parking brake function. The rotating electrical machine 1 exhibits a parking brake function by a variable field mechanism 50 and a controller 52 that controls the variable field mechanism 50. That is, in the present embodiment, the variable field mechanism 50 and the controller 52 correspond to an example of “means for giving the rotating electrical machine a parking brake function”.

(1-2. Configuration of rotating electrical machine)
An example of the configuration of the rotating electrical machine 1 used in the parking brake system 100 will be described with reference to FIGS. 2 and 3. The rotating electrical machine 1 is a variable field type rotating electrical machine capable of changing a field magnetic flux.

As shown in FIGS. 2 and 3, the rotating electrical machine 1 includes an annular stator 2, a shaft 34 disposed concentrically on the radially inner side of the stator 2, and a rotor 3 provided on the shaft 34. .

The stator 2 is, for example, an annular stator core 13 provided on the inner peripheral surface of a substantially cylindrical frame 17 and having a plurality of teeth portions 13a in the circumferential direction, and a plurality of stators mounted on the plurality of teeth portions 13a. A winding 12 is provided. The stator core 13 includes a slot 13b (corresponding to an example of a winding gap) that is opened radially inward between adjacent tooth portions 13a. Both sides in the circumferential direction of the stator winding 12 attached to the tooth portion 13a are accommodated in slots 13b on both sides of the tooth portion 13a. The stator iron core 13 is fastened to the load side bracket 16 by a stator fastening bolt 14. On the non-load side (left side in FIG. 2) of the stator core 13, a connection part 21 for connecting the winding start and end terminals of the stator winding 12 is arranged.

The load side bracket 16 and the frame 17 are provided with a load side bearing 18 and an anti-load side bearing 19, respectively. The shaft 34 is rotatably supported by the load side bearing 18 and the anti-load side bearing 19.

In this specification, the “load side” refers to the direction in which a load is attached to the rotating electrical machine 1, that is, the direction in which the shaft 34 protrudes (right side in FIG. 2) in this example. The direction opposite to the load side, that is, the direction in which the gear wheel 23 and the like are arranged with respect to the rotating electrical machine 1 in this example (left side in FIG. 2) is indicated.

The frame 17 is fixed to the load side bracket 16 by the frame fastening bolt 11 inserted from the non-load side. A sensor magnet 20 is attached to the anti-load side plate 33 provided on the anti-load side of the rotor 3, and a position detection unit 25 for detecting the rotational position of the rotor 3 by the sensor magnet 20 is provided inside the frame 17. It is done.

In FIG. 3 and the like, the case where the rotating electrical machine 1 has 10 poles and 12 slots is shown as an example, but the slot combination of the rotating electrical machine 1 is not limited to this.

(1-3. Configuration of rotor)
An example of the configuration of the rotor 3 will be described with reference to FIGS. 2, 3, 5A, and 5B. In this example, the rotor 3 is divided into three in the axial direction. That is, the rotor 3 includes one movable rotor 47 disposed in the center in the axial direction, a fixed rotor 46 disposed on the load side of the movable rotor 47, and a fixed rotor 48 disposed on the non-load side. Have. Note that the number of divisions of the rotor 3 is not limited to 3, but may be, for example, 5 divisions. However, for the sake of explanation, the case of 3 divisions will be described as an example.

As shown in FIG. 3, the movable rotor 47 includes a rotor core 38 disposed with a magnetic gap between the stator 2 and a plurality of permanent magnets 39 provided on the rotor core 38. The plurality of permanent magnets 39 is a mode in which two permanent magnets 39 in which the same magnetic poles of N poles or S poles face each other form a V-shaped pair projecting radially inward when viewed from the axial direction. Opposing magnetic poles of the same polarity are alternately arranged in the circumferential direction and arranged inside the rotor core 38. As a result, N pole and S pole magnetic pole portions 47 a having different polarities alternately in the circumferential direction are formed on the outer periphery of the movable rotor 47.

Since the rotor core 38 is provided on the outer surface of the shaft 34 via the hub 32 and the slider 37, the movable rotor 47 can rotate relative to the fixed

rotors

46 and 48. Details of the variable field mechanism 50 including a drive mechanism for relatively rotating the movable rotor 47 will be described later.

The fixed

rotors

46 and 48 have the same configuration as the movable rotor 47. As shown in FIGS. 5A and 5B, the fixed

rotors

46 and 48 include a rotor core 38 and the same number of permanent magnets 39 as the permanent magnets 39 of the movable rotor 47. The permanent magnet 39 is arranged in the same manner as the movable rotor 47, and N and S pole portions 46a and 48a having different polarities in the circumferential direction are formed on the outer circumferences of the fixed

rotors

46 and 48, respectively. .

An annular load side plate 31 and an anti load side plate 33 are fixed to the load side and the anti load side of the rotor 3, respectively. The fixed

rotors

46, 48 are fixed to the load side plate 31 and the anti-load side plate 33 by the bolts 35, so that the shaft 34 passes through the load side plate 31 and the anti-load side plate 33. Fixed to.

(1-4. Configuration of variable field mechanism)
An example of the configuration of the variable field mechanism 50 will be described with reference to FIGS. 2, 3, and 4. As described above, the rotor core 38 of the movable rotor 47 is attached to the shaft 34 via the hub 32 and the slider 37. The variable field mechanism 50 includes the hub 32, the slider 37, and the like. As shown in FIG. 4, the shaft 34 is formed with a square spline portion 34 a along the axial direction on the outer peripheral surface near the anti-load side (oblique left lower side in FIG. 4). Moreover, the groove part 34b of the radial direction both sides which the both ends of the pin 36 which penetrated the slider 37 penetrates is formed between square-shaped spline parts 34a. The groove part 34b is provided in the shape of a long hole from the substantially central part in the axial direction of the square spline part 34a to the vicinity of the end part on the load side (oblique upper right side in FIG. 4).

In the slider 37, a square spline portion 37a is formed along the axial direction on the inner peripheral surface, and the pin 36 penetrates in the radial direction. The slider 37 is mounted on the outer periphery of the shaft 34, and the square spline portion 37 a is engaged with the square spline portion 34 a of the shaft 34. The slider 37 can move in the axial direction within the range of the groove 34b with respect to the shaft 34 by the movement of the pin 36 in the axial direction. A torsion spline portion 37 b inclined in the circumferential direction is formed on the outer peripheral surface of the slider 37.

The movable rotor 47 is mounted on the outer peripheral surface of the hub 32. On the inner peripheral surface of the hub 32, a torsion spline portion 32a inclined in the same direction as the torsion spline portion 37b of the slider 37 is provided. The torsion spline portion 32 a engages with the torsion spline portion 37 b of the slider 37. The hub 32 rotates by a predetermined amount in the circumferential direction by the movement of the slider 37 by a predetermined amount in the axial direction. An uneven portion 32 b is provided on the outer peripheral surface of the hub 32. The uneven portion 32 b engages with an uneven portion 38 a (see FIG. 3) provided on the inner peripheral surface of the rotor core 38 of the movable rotor 47. The rotor core 38 and the hub 32 of the movable rotor 47 are fixed by shrink fitting, for example. The movable rotor 47 rotates a predetermined amount in the circumferential direction integrally with the hub 32 by a predetermined amount of movement of the slider 37 in the axial direction.

As shown in FIG. 2, the central portion of the pin 36 is attached to a pin holder 28 installed in the shaft 34 so as to be movable in the axial direction. The pin holder 28 is attached to the load side end portion of the feed male screw 42 via the movable bearing 40. The movable bearing 40 is, for example, a pair of angular bearings, and is arranged so that the axial support directions face each other. The movable bearing 40 is held by a bearing holder 44 fixed to the load side end of the feed male screw 42 by a bolt 45. The opposite end of the feed male screw 42 is engaged with the feed screw 43.

A fixed bearing 41 is mounted between the feed screw 43 and the shaft 34. The fixed bearing 41 is fixed to the feed screw 43 by the nut 29. The fixed bearing 41 is a pair of angular bearings, for example, and is arranged so that the axial support directions face each other. For example, a hexagonal hole 42 a is formed at the end of the feed male screw 42 on the side opposite to the load.

As shown in FIG. 2, the variable field mechanism 50 includes a gear wheel 23 having a shaft portion 23a inserted into a hole 42a of a feed male screw 42, a worm shaft 27 meshing with the gear wheel 23, a worm A control motor 55 (see FIG. 1) having a shaft 27 attached to the output shaft is provided. The gear wheel 23 is rotatably supported by the bearing 26 with respect to the feed screw 43. The gear wheel 23, the bearing 26, the worm shaft 27, and the like are covered with a cover 24 attached to the non-load side of the frame 17.

The variable field mechanism 50 operates as follows. When the control motor 55 rotates the worm shaft 27, the gear wheel 23 rotates and the feed male screw 42 moves in the axial direction with respect to the feed screw 43. The feed male screw 42 moves the pin 36 and the pin holder 28 in the axial direction while being blocked from the rotation of the shaft 34 by the movable bearing 40 attached to the end portion on the load side. The pin 36 moves the slider 37 outside the shaft 34 in the axial direction. Since the slider 37 is engaged with the hub 32 by the

torsion spline portions

37b and 32a, when the slider 37 moves in the axial direction, the hub 32 and the movable rotor 47 fixed thereto are two fixed rotations fixed to the shaft 34. It rotates with respect to the

children

46 and 48.

(1-5. Change in rotor field magnetic flux)
Changes in the field magnetic flux of the rotor 3 will be described with reference to FIGS. 5A and 5B. As shown in FIG. 5A, when the movable rotor 47 rotates in one direction of rotation, that is, in the direction in which the movable rotor 47 and the fixed

rotors

46 and 48 come closer to each other with the same polarity, the magnetic pole parts 46a, 47a and 48a. As the magnetic fluxes of each other strengthen, the field magnetic flux increases.

On the other hand, as shown in FIG. 5B, when the movable rotor 47 rotates in the other direction of rotation, that is, in the direction in which the magnetic pole parts of the same polarity of the movable rotor 47 and the fixed

rotors

46 and 48 move away from each other, the magnetic pole parts 46a and 47a. , 48a cancel each other and the field magnetic flux decreases.

Thus, by rotating the movable rotor 47 by the control motor 55, the field magnetic flux strength of the rotor 3 can be changed as shown in FIGS. 5A and 5B.

(1-6. Parking brake function by cogging torque)
The rotating electrical machine 1 functions as a motor when the vehicle C is accelerated, etc., and also functions as a generator when the vehicle is decelerated, and generates braking force of the vehicle C while regenerating electric power. This regenerative braking force decreases as the speed of the vehicle C decreases, and does not occur in a stopped state. In the present embodiment, when the vehicle C is stopped, the rotation of the rotor 3 is prevented using the cogging torque that acts on the magnetic pole portion of the rotor 3 of the rotating electrical machine 1, and the parking brake function is exhibited. This will be described in detail with reference to FIGS. 6A and 6B and FIGS. 7A and 7B.

As shown in FIG. 3 and the like, in the rotating electrical machine 1 having, for example, 10 poles and 12 slots (the number of poles of the rotor 3 is 10 and the number of slots of the stator 2 is 12), in principle, during one rotation of the rotor 3 60 cycles of cogging torque are generated. In the rotating electrical machine 1 of the present embodiment, cogging torque generated in the magnetic pole portion 47a of the central movable rotor 47 and cogging torque generated in the magnetic pole portions 46a and 48a of the fixed

rotors

46 and 48 on both sides are separately generated. The magnitude of the cogging torque can be adjusted by relatively rotating the magnetic pole part 47a and the magnetic pole parts 46a and 48a by the variable field mechanism 50.

6A and 6B show the relationship between the angular position of the rotor 3 in the rotational direction and the cogging torque. 6A and 6B, the “cogging torque ratio” on the vertical axis represents the ratio of the cogging torque when the maximum value of the cogging torque of the magnetic pole portion 47a of the central movable rotor 47 is 1. In addition, “center” indicated by a broken line in the figure is the cogging torque of the movable rotor 47, “both sides” indicated by a thin solid line is a combination of cogging torques of the fixed

rotors

46 and 48, and “synthesis” indicated by a thick solid line is the movable rotor. The cogging torque of the rotor 3 as a whole obtained by combining the cogging torque of 47 and the cogging torque of the fixed

rotors

46 and 48 is shown.

FIG. 6A shows the cogging torque when the rotor 3 is in the state shown in FIG. 7A. That is, as shown in FIG. 7A, the magnetic pole portion 47a of the movable rotor 47 and the magnetic pole portions 46a and 48a of the fixed

rotors

46 and 48, each having the same polarity, are aligned in the axial direction (the relative rotation angle is approximately 0 degrees). ). The cogging torque of the magnetic pole portion 47a of the central movable rotor 47 and the cogging torque of the magnetic pole portions 46a and 48a of the fixed

rotors

46 and 48 on both sides have substantially the same amplitude with a rotation angle of approximately 6 ° as one cycle. It changes like a sine wave. Therefore, in the state shown in FIG. 7A, the cogging torque of the magnetic pole portion 47a and the cogging torque of the magnetic pole portions 46a and 48a are strengthened, and the cogging torque obtained by combining the movable rotor 47 and the fixed

rotors

46 and 48 is the maximum. Become. In addition, electromagnetic design is performed on each magnetic pole portion 47a, 46a, 48a of the rotating electrical machine 1 so that the maximum cogging torque becomes the cogging torque necessary for locking the vehicle C.

On the other hand, FIG. 6B shows the cogging torque when the rotor 3 is in the state shown in FIG. 7B. That is, as shown in FIG. 7B, the relative rotation angle between the magnetic pole portion 47a of the movable rotor 47 and the magnetic pole portions 46a and 48a of the fixed

rotors

46 and 48, each having the same polarity, is approximately 3 degrees. In this state, the cogging torque of the magnetic pole part 47a and the cogging torque of the magnetic pole parts 46a and 48a are out of phase by a half period, so the cogging torques cancel each other. Accordingly, the cogging torque obtained by combining the movable rotor 47 and the fixed

rotors

46 and 48 is minimized.

Therefore, when the operation member 51 is operated to turn on the parking brake function when the vehicle C is stopped or parked, the controller 52 outputs a control signal to the control motor 55 of the variable field mechanism 50 to output the rotor. By setting 3 to the state shown in FIG. 7A, the rotation of the rotor 3 can be prevented and the rotating electrical machine 1 can be almost locked. On the other hand, when the operation member 51 is operated so as to turn off the parking brake function when the vehicle C starts, the controller 52 outputs a control signal to the control motor 55 of the variable field mechanism 50 to rotate the rotor 3. By setting the state of FIG. 7B, the cogging torque can be minimized and the vehicle C can be started easily. During traveling of the vehicle C, the field magnetic flux is varied by the variable field mechanism 50 in accordance with the traveling state. However, since the rotor 3 is rotating, the cogging torque is applied regardless of the magnitude of the cogging torque. It will not be.

(1-7. Effects of First Embodiment)
As described above, the parking brake system 100 according to the first embodiment includes the rotating electrical machine 1 and means for giving the rotating electrical machine 1 a parking brake function. In the vehicle C, the rotating electrical machine 1 is used as a motor at the time of acceleration in normal traveling, and is used as a generator that performs regenerative braking at the time of deceleration. Moreover, the parking brake function with which the rotary electric machine 1 is provided at the time of a stop and parking is used. Thus, when the rotating electrical machine 1 has the parking brake function, a single brake system in which a plurality of brake systems (regenerative brake and parking brake) are integrated can be constructed. Thereby, compared with the case where a some brake system is mounted separately, a structure can be simplified and the control becomes easy. Further, since the system configuration is simplified, the mounting property on the vehicle is improved and the cost can be reduced.

In the present embodiment, in particular, the parking brake system 100 includes an operation member 51 that is operated to turn on or off the parking brake function of the rotating electrical machine 1, and means for causing the rotating electrical machine 1 to have a parking brake function is provided. And a variable field mechanism 50 and a controller 52. As a result, the cogging torque of the rotating electrical machine 1 can be maximized to make the rotating electrical machine 1 almost in a locked state. Therefore, the rotary electric machine 1 can be provided with a parking brake function without using a hydraulic mechanism or a friction mechanism. In addition, by making the rotating electrical machine 1 a variable field type, it is possible to obtain a strong acceleration / deceleration torque by adjusting the field magnetic flux so as to increase during rapid acceleration / deceleration. As described above, the field magnetic flux can be adjusted to an optimum value according to the traveling state, so that it is possible to travel while obtaining high efficiency.

Further, particularly in the present embodiment, the rotating electrical machine 1 has a stator core 13 in which a slot 13b in which the stator winding 12 is accommodated opens toward the radially inner side. Thus, by making the stator iron core 13 into a so-called open slot structure, the cogging torque when the parking brake is on can be increased, and the lock function of the rotating electrical machine 1 can be enhanced.

(1-8. Modification of First Embodiment)
In the above, the field magnetic flux is made variable by partially rotating the rotor 3 divided in the axial direction by the variable field mechanism 50. However, the variable field changing the field magnetic flux of the rotating electrical machine 1 is changed. The magnetic mechanism is not limited to this. For example, the field magnetic flux may be varied by partially rotating the rotor divided in the radial direction. Further, for example, the rotor may include a rotor winding, and the field magnetic flux may be varied by changing the current.

<2. Second Embodiment>
In the first embodiment, the field magnetic flux of the rotating electrical machine 1 is varied and the cogging torque of the rotor 3 is used to give the rotating electrical machine 1 a parking brake function. It is good also as a structure which brakes and gives the rotary electric machine 1A the parking brake function. The second embodiment will be described with reference to FIGS. 8, 9, 10A, and 10B.

(2-1. Configuration of rotating electrical machine)
The parking brake system 100 according to the second embodiment includes the operation member 51 described above and the rotating electrical machine 1A. As shown in FIGS. 8 and 9, the rotating electrical machine 1 A includes a load side plate 31 A and an anti-load side plate 33 A (corresponding to an example of a side plate) that fix the rotor 3 to the shaft 34. The rotating electrical machine 1A is in contact with the anti-load side plate 33A and applies a braking force to the rotor 3, and a drive for moving the braking plate 61 back and forth with respect to the rotor 3 according to the operation of the operation member 51. A device 60 is provided.

FIG. 10A shows an example of the structure of the brake plate 61, and FIG. 10B shows an example of the structure of the anti-load side plate 33A. As shown in FIG. 10B, a plurality of through-holes 33a (corresponding to an example of recesses) penetrating in the axial direction are formed in the anti-load side plate 33A at regular intervals along the circumferential direction. In addition, it is good also as a recessed part instead of setting it as a through-hole. As shown in FIG. 10A, the brake plate 61 is, for example, an annular plate member made of a magnetic material (for example, iron). A plurality of support shafts 64 are provided along the circumferential direction on the outer peripheral portion of the surface of the brake plate 61 on the side opposite to the load. On the load side surface of the brake plate 61, for example, a protrusion 64a that can be engaged with the through hole 33a of the anti-load side plate 33A is provided at a position corresponding to the support shaft 64. The support shaft 64 and the protrusion 64a may be used as a single member, and the brake plate 61 may be penetrated. Alternatively, the brake plate 61 may be integrally formed by casting or the like as a shape including the support shaft 64 and the protrusion 64a. Good. The brake plate 61 is movable in the axial direction while being prevented from moving in the rotational direction by inserting the support shaft 64 into the hole 17 a provided in the frame 17.

The driving device 60 includes a spring 62, an electromagnet 63, and the like. The spring 62 is attached to the support shaft 64 and provided between the frame 17 and the brake plate 61, and biases the brake plate 61 in the axial direction toward the rotor 3. The electromagnet 63 is attached to the inner peripheral side of the hole 17a of the frame 17, for example. The electromagnet 63 is excited by passing a current through the coil 63 a and attracts the braking plate 61 against the urging force of the spring 62. The power supply to the coil 63a is controlled by, for example, the controller 52 in accordance with the operation of the operation member 51 (see FIG. 1). Note that power supply to the coil 63a may be controlled by a control device different from the controller 52.

For example, when the operation member 51 is operated to turn on the parking brake function when the vehicle C is stopped or parked, the power supply to the coil 63a is cut off, and the brake plate 61 is moved by the spring 62 as shown in FIG. It is pressed against the anti-load side plate 33A. As a result, the brake plate 61 applies a frictional force to the anti-load side plate 33A, and the protrusions 64a of the brake plate 61 fit into the through holes 33a of the anti-load side plate 33A, and the rotation of the rotating electrical machine 1 is locked. The On the other hand, for example, when the operation member 51 is operated to turn off the parking brake function when the vehicle C starts, power is supplied to the coil 63a, and the brake plate 61 is moved by the electromagnet 63 as shown in FIG. It is adsorbed and separated from the anti-load side plate 33A. Thereby, the braking plate 61 does not hinder the rotation of the anti-load side plate 33A, and the braking of the rotating electrical machine 1 is released.

As described above, the rotating electrical machine 1 A exhibits the parking brake function by the anti-load side plate 33 A, the brake plate 61, and the drive device 60. That is, in the second embodiment, the anti-load side plate 33A, the braking plate 61, and the driving device 60 correspond to an example of “means for giving the rotating electrical machine a parking brake function”.

(2-2. Effect of Second Embodiment)
As described above, according to the second embodiment, a rotating electrical machine having a parking brake function can be realized with a simple configuration in which the rotating electrical machine 1A is provided with the anti-load side plate 33A, the braking plate 61, and the driving device 60. Further, since the brake plate 61 is made of a magnetic material, the magnetic attraction force of the rotor 3 can be used when pressing the brake plate 61 against the anti-load side plate 33A. Thereby, the structure of the drive device 60 can be simplified.

(2-3. Modification of Second Embodiment)
The braking plate 61 may be an annular plate having no protrusion 64a, and the braking force may be applied to the rotor 3 by a frictional force caused by simple contact with the anti-load side plate 33A.

Further, the driving device 60 that moves the braking plate 61 forward and backward with respect to the rotor 3 is not limited to the above-described spring 62 and electromagnet 63. For example, it is good also as a drive device using a control motor etc. like 3rd Embodiment mentioned later.

In the second embodiment, the brake plate 61 and the like are provided on the anti-load side plate 33A side. However, the brake plate 61 and the like may be provided on the load side plate 31A side, and the load side plate 31A and the anti load side may be provided. A brake plate 61 or the like may be provided for both of the plates 33A.

In the second embodiment, a mechanism for changing the field magnetic flux of the rotating electrical machine 1A may be provided, such as the variable field mechanism 50 of the first embodiment described above. Thereby, it becomes possible to use together the structure of 2nd Embodiment and the brake using the above-mentioned cogging torque, and can further improve a parking brake function.

<3. Third Embodiment>
In the third embodiment, another example in which the rotor 3 is mechanically braked to give the rotating electrical machine 1B a parking brake function will be described. A third embodiment will be described with reference to FIG.

(3-1. Configuration of rotating electrical machine)
The parking brake system 100 according to the third embodiment includes the operation member 51 described above and the rotating electrical machine 1B. As shown in FIG. 11, the rotating electrical machine 1 B includes a load side plate 31 B and an anti-load side plate 33 B (corresponding to an example of a side plate) that fix the rotor 3 to the shaft 34. The rotating electrical machine 1B is in contact with the anti-load side plate 33B and applies a braking force to the rotor 3, and a drive for moving the braking plate 71 forward and backward with respect to the rotor 3 according to the operation of the operation member 51. A device 70 is provided.

The brake plate 71 is, for example, an arc-shaped or fan-shaped plate member, and is made of a nonmagnetic material (for example, aluminum). The brake plate 71 may be made of a magnetic material (for example, iron). The brake plate 71 has a friction material 71a that is pressed against the anti-load side plate 33B on the load side surface when contacting the anti-load side plate 33B.

The driving device 70 includes a feed screw 72 provided on the frame 17, a feed male screw 73 that supports the outer peripheral side of the brake plate 71 and meshed with the feed screw 72, and a feed male screw 73 as a rotation shaft. A feed gear 74, a worm gear 75 meshing with the feed gear 74, and a control motor 56 to which the worm gear 75 is attached. The driving device 70 is provided between the shaft portion 76 that supports the inner peripheral side of the brake plate 71 and protrudes from the frame 17, and a collar portion 76 a provided at an end portion of the shaft portion 76 and the frame 17. And a spring 77.

When the vehicle is stopped and parked, if the operation member 51 is operated so as to turn on the parking brake function, the drive device 70 operates as follows. That is, when the control motor 56 is operated to rotate the worm gear 75, the feed gear 74 is rotated, the feed male screw 73 is moved to the load side with respect to the feed screw 72, and the brake plate 71 is moved to the anti-load side plate 33. Move towards Thereby, the friction material 71a is pressed against the anti-load side plate 33, and the rotor 3 is braked by the frictional force. On the other hand, for example, when the operation member 51 is operated so as to turn off the parking brake function when the vehicle C starts, the control motor 56 is opened, and the braking plate 71 is moved against the anti-load side plate 33B by the urging force of the spring 77. And the braking of the rotor 3 is released. When the parking brake function is turned off, the control motor 56 rotates the worm gear 75 and the feed gear 74 in the opposite direction to the on state, and the feed male screw 73 is moved to the opposite load side with respect to the feed screw 72. You may let them. The control motor 56 is controlled by, for example, the controller 52 in accordance with the operation of the operation member 51 (see FIG. 1). Note that the control motor 56 may be controlled by a control device different from the controller 52.

As described above, the rotating electrical machine 1 B exhibits the parking brake function by the anti-load side plate 33 B, the brake plate 71, and the drive device 70. That is, in the third embodiment, the anti-load side plate 33B, the brake plate 71, and the drive device 70 correspond to an example of “means for giving the rotating electrical machine a parking brake function”.

(3-2. Effects of Third Embodiment)
According to the third embodiment, since the pressing force of the brake plate 71 can be adjusted to an arbitrary magnitude using the control motor 56, not only the parking brake function but also the brake function used when the vehicle C is decelerated, etc. The provided rotating electrical machine can be realized. Further, since the brake plate 71 is made of a nonmagnetic material (aluminum or the like), an eddy current can be generated in the brake plate 71 in a state of being separated from the rotor 3 to generate a braking force. As a result, for example, the braking force by the eddy current can be used as an auxiliary force for the regenerative brake at the time of sudden deceleration or the like. When the brake plate 71 is made of a magnetic material, the magnetic attraction force of the rotor 3 can be used when the brake plate 71 is pressed against the anti-load side plate 33B, so that the configuration of the drive device 70 can be simplified.

(3-3. Modification of Third Embodiment)
The braking plate 61 may be an annular plate having no protrusion 64a, and the braking force may be applied to the rotor 3 by a frictional force caused by simple contact with the anti-load side plate 33A.

Further, the drive device 70 for moving the brake plate 61 forward and backward with respect to the rotor 3 is not limited to the device using the above-described control motor or the like. For example, it is good also as a drive device using an electromagnet, a spring, etc. like the above-mentioned 2nd Embodiment.

In the third embodiment, the brake plate 71 and the like are provided on the anti-load side plate 33B side. However, the brake plate 71 and the like may be provided on the load side plate 31B side, and the load side plate 31B and the anti load side may be provided. A brake plate 71 or the like may be provided for both of the plates 33B.

In the third embodiment, a mechanism for changing the field magnetic flux of the rotating electrical machine 1A may be provided, such as the variable field mechanism 50 of the first embodiment described above. Thereby, it becomes possible to use the structure of 3rd Embodiment and the brake using the above-mentioned cogging torque together, and can further improve a parking brake function.

In addition to those already described above, the methods according to the above embodiments may be used in appropriate combination.

In addition, although not illustrated one by one, each of the above-described embodiments is implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 1A Rotating electrical machine 1B Rotating electrical machine 3 Rotor 12 Stator winding 13 Stator core 13b Slot (an example of a gap for winding)
33A Anti-load side plate (an example of a side plate, an example of means for providing a parking brake function)
33B Anti-load side plate (an example of a side plate, an example of means for providing a parking brake function)
33a Through hole (an example of a recess)
34 Shaft 50 Variable field mechanism (an example of means for providing a parking brake function)
51 Operation member 52 Controller (an example of means for providing a parking brake function)
60 Drive device (an example of means for providing a parking brake function)
61 Brake plate (an example of means for providing a parking brake function)
64a protrusion 70 driving device (an example of means for providing a parking brake function)
71 Control board (an example of means for providing a parking brake function)
71a Friction material 100 Parking brake system (an example of a vehicle brake system)
C vehicle

Claims

A vehicle brake system mounted on a vehicle having a function of traveling using a rotating electric machine,
The rotating electrical machine;
Means for giving the rotating electrical machine a parking brake function;
A vehicle brake system characterized by comprising:
An operation member operated to turn on or off the parking brake function of the rotating electrical machine;
Means for giving the rotating electrical machine a parking brake function is as follows.
A variable field mechanism for varying the field magnetic flux of the rotating electrical machine;
And a controller that controls the variable field mechanism so as to maximize the field magnetic flux of the rotating electrical machine when the operation member is operated to turn on the parking brake function. The vehicle brake system according to claim 1.
The rotating electric machine is
The vehicular brake system according to claim 1 or 2, wherein a winding gap in which the stator winding is accommodated has a stator core that is opened radially inward.
An operation member operated to turn on or off the parking brake function of the rotating electrical machine;
Means for giving the rotating electrical machine a parking brake function is as follows.
A side plate disposed on at least one axial end of the rotor of the rotating electrical machine, and fixing the rotor to a shaft;
A braking plate arranged to be movable in the axial direction and configured to apply a braking force in contact with the side plate;
A drive device configured to move the brake plate forward and backward with respect to the rotor in response to an operation of the operation member;
The vehicle brake system according to any one of claims 1 to 3, further comprising:
The side plate has a recess,
The braking plate is
The vehicle brake system according to claim 4, further comprising a protrusion that fits into the concave portion when contacting the side plate.
The braking plate is
The vehicle brake system according to claim 4, further comprising a friction material that is pressed against the side plate when contacting the side plate.
A rotating electrical machine used in the vehicle brake system according to any one of claims 1 to 6.
A vehicle comprising the vehicle brake system according to any one of claims 1 to 6.