GB2479898A - Electric motor having an annular brake disc and two braking devices - Google Patents

Electric motor having an annular brake disc and two braking devices Download PDF

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Publication number
GB2479898A
GB2479898A GB201007060A GB201007060A GB2479898A GB 2479898 A GB2479898 A GB 2479898A GB 201007060 A GB201007060 A GB 201007060A GB 201007060 A GB201007060 A GB 201007060A GB 2479898 A GB2479898 A GB 2479898A
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GB
United Kingdom
Prior art keywords
brake
rotor
electric motor
stator
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB201007060A
Other versions
GB201007060D0 (en
GB2479898B (en
Inventor
Alexander Fraser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protean Electric Ltd
Original Assignee
Protean Electric Ltd
Protean Holdings Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Protean Electric Ltd, Protean Holdings Corp filed Critical Protean Electric Ltd
Priority to GB201007060A priority Critical patent/GB2479898B/en
Publication of GB201007060D0 publication Critical patent/GB201007060D0/en
Publication of GB2479898A publication Critical patent/GB2479898A/en
Application granted granted Critical
Publication of GB2479898B publication Critical patent/GB2479898B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/065—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/58—Combined or convertible systems
    • B60T13/585—Combined or convertible systems comprising friction brakes and retarders
    • B60T13/586—Combined or convertible systems comprising friction brakes and retarders the retarders being of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/005—Brakes straddling an annular brake disc radially internally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0066—Brakes having more than one actuator on the same side of the disc
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0075—Constructional features of axially engaged brakes
    • F16D2055/0083—Constructional features of axially engaged brakes with brake actuator located radially inside of an annular rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

An electric motor for mounting within a wheel of a vehicle, the electric motor comprising a rotor 220, 221, a stator 230, 231, an annular braking disc 260 and a first and second brake device 270. The rotor is mounted to the stator with means to allow rotation of the rotor with respect to the stator and the first and second brake devices 270, preferably brake calipers, are operable to inhibit rotation of the rotor with respect to the stator by applying a braking force at preferably substantially diametrically opposite positions on the annular disc 260. The first and second brake devices may be sliding calipers and may be hydraulically or electromechanically actuated.

Description

AN ELECTRIC MOTOR BRAKE SYSTEM
The present invention relates to a brake system, in particular a brake system for an in-wheel electric motor.
With increased interest being placed in environmentally friendly vehicles there has, perhaps unsurprisingly, been a corresponding increase in interest in the use of electric vehicles.
Electric vehicles typically use an electric motor to provide both drive for the vehicle and regenerative braking for stopping the vehicle. To effect regenerative braking, rotary motion of drive wheels connected to an electric motor is converted into electric energy, which involves consumption of kinetic energy that provides a braking force to the drive wheels.
However, the forces required for emergency braking of a road vehicle are typically far greater than those required for longitudinal acceleration. For example, emergency braking of a road car can typically result in deceleration of up to approximately 1G, which is normally limited by the grip between the car's tyres and the road. However, it is rare for a driver of a road car to require more than O.5G longitudinal acceleration.
Consequently, an electric motor that is optimised for providing drive for a vehicle may not be capable of providing sufficient regenerative braking that is typically required for emergency braking. As a result, an electric vehicle will typically include an additional braking system to supplement the regenerative braking provided by an electric motor used to drive the vehicle.
Although most commercially available electric vehicles utilise a central electric motor that is used to drive two or more of the vehicles wheels, an alternative solution that is gaining increased popularity utilises in-wheel electric motors, where individual electric motors are used to drive the respective wheels of a vehicle.
However, the use of in-wheel electric motors can restrict the available space for locating a mechanical braking system.
One solution to this problem has been the introduction of a disc brake attached to an external surface of an in-wheel electric motor rotor, with a brake calliper attached to a stationary part of the vehicle to which the in-wheel electric motor is attached. However, this solution can result in large radial forces being applied to the rotor, which can cause distortion of the rotor under braking.
It is desirable to improve this situation.
In accordance with an aspect of the present invention there is provided an electric motor according to the accompanying claims.
This provides the advantage of allowing a mechanical braking system to be mounted to an in-wheel electric motor.
Additionally, the use of two brake callipers, which are arranged to provide brake forces at substantially diametrically opposite points on a brake disc, allows brake forces applied to the brake disc to be balanced, thereby reducing the radial distortion forces placed upon the electric motor's rotor.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 illustrates an exploded view of a motor according to an embodiment of the present invention; Figure 2 illustrates an exploded view of the motor of Figure 1 from an alternative angle; Figure 3 illustrates a cross sectional view of braking assembly according to an embodiment of the present invention; Figure 4 is of a graph illustrating the relationship between different calliper separation angles for a dual brake calliper arrangement and the reduction in radial force on a brake disc.
The embodiment of the invention described is an electric motor for use in a wheel of a vehicle having a brake system.
For the purpose of illustration the motor is of the type having a set of coils being part of the stator for attachment to a vehicle, radially surrounded by a rotor carrying a set of magnets for attachment to a wheel. For the avoidance of doubt the invention is applicable to an arrangement having the rotor centrally mounted within radially surrounding coils.
The physical arrangement of the embodying assembly is best understood with respect to Figures 1 and 2. The assembly can be described as a motor with built in electronics and bearing, or could also be described as a hub motor or hub drive as it is built to accommodate a separate wheel.
Referring first to Figure 1, the assembly comprises a stator comprising a rear portion 230 forming a first part of the housing of the assembly, and a heat sink and drive arrangement 231 comprising multiple coils and electronics to drive the coils as well as a heat sink. The coil drive arrangement 231 is fixed to the rear portion 230 to form the stator which may then be fixed to a vehicle and does not rotate during use. The coils themselves are formed on tooth laminations which together with the drive arrangement 231 and rear portion 230 form the stator.
Although not shown, also mounted to the stator are a plurality of capacitor circuit boards for providing capacitance between the electric motor and the voltage supply to reduce voltage line drop and rise and to reduce current ripple.
A rotor comprises a front portion 220 and a cylindrical portion 221 forming a cover, which substantially surrounds the stator. The rotor includes a plurality of magnets 242 arranged around the inside of the cylindrical portion 221.
The magnets are thus in close proximity to the coils on the assembly 231 so that magnetic fields generated by the coils in the assembly 231 generate a force on the magnets 242 arranged around the inside of the cylindrical portion 221 of the rotor, thereby causing the rotor to rotate.
Additionally, the rotor includes a support ring 250 on which is mounted an annular brake disc 260, which forms part of a brake system. Preferably, the support ring 250 is mounted to the rotor housing once the rotor housing has been attached to the stator. Preferably, the annular brake disc 260 is fixed to the support ring 250 in a manner to allow for radial expansion (i.e. a floating disc), for example by using mounting slots on the annular brake disc 260.
Additionally, the annular brake disc 260, and its associated mounted to the rotor, allows for the even transfer of braking torque around the rotor and does not cause undue mechanical stress or deformation of the rotor at the fixing points of the annular brake disc 260 to the rotor. For example, within the present embodiment the annular brake disc 260 has sixteen mounting points for mounting the annular brake disc 260 to the support ring 250, thereby allowing braking torque to be applied to the rotor evenly.
However, different mounting configurations can be used.
The rotor is attached to the stator 252 by a bearing block 223. The bearing block 223 can be a standard bearing block as would be used in a vehicle to which this motor assembly is to be fitted. The bearing block comprises two parts, a first part fixed to the stator and a second part fixed to the rotor. The bearing block is fixed to a central portion of the wall 230 of the stator 252 and also to a central portion of the housing wall 220 of the rotor. The rotor 240 is thus rotationally fixed to the vehicle with which it is to be used via the bearing block 223 at the central portion of the rotor. This has a significant advantage in that a wheel rim and tyre can then be fixed to the rotor 240 at the central portion using the normal wheel bolts to fix the wheel rim to the central portion of the rotor and consequently firmly onto the rotatable side of the bearing block 223. The wheel bolts may be fitted through the central portion of the rotor through into the bearing block itself. A first advantage of this arrangement is that the whole assembly may be simply retrofitted to an existing vehicle by removing the wheel, bearing block and any other components such as the braking arrangement. The existing bearing block can then fitted inside the assembly and the whole arrangement fitted to the vehicle on the stator side and the normal rim and wheel fitted to the rotor so that the rim and wheel surrounds the whole motor assembly.
Accordingly, retrofitting to existing vehicles becomes very simple.
A second advantage is that there are no forces for supporting the vehicle on the outside of the rotor, particularly on the circumferential wall 221 carrying the magnets on the inside circumference. This is because the forces for carrying the vehicle are transmitted directly from the suspension fixed to one side of the bearing block (via the central portion of the stator wall) to the central portion of the wheel surrounding the rotor fixed to the other side of the bearing block (via the central portion of the rotor wall) . This means that the circumferential wall 221 of the rotor is not subject to any forces that could deform the wall thereby causing misalignment of the magnets.
Mounted on the rear portion 230 of the stator are two brake assemblies 270 in a position axially and radially in-board (i.e. inside) of the cylindrical portion 221 of the rotor.
The two brake assemblies 270 are mounted on the rear portion 230 of the stator in a position that allows the brake assemblies 270 to apply a brake force on the annular disc 260. To minimise mechanical stress or deformation of the rotor and annular brake disc 260 preferably the second brake assembly is arranged to apply a brake force on the annular brake disc 260 at a point between 170 and 190 degrees from the force applied by the first brake assembly. Preferably, the two brake assemblies 270 are arranged to apply a respective braking force at substantially diametrically opposite positions on the annular brake disc 260, as described below.
Figure 3 illustrates a cross sectional view of the two brake assemblies 270 mounted on the rear portion 230 of the stator in a position that allows a braking force to be applied to the annular disc 260 at substantially diametrically opposite positions on the annular brake disc 260. However, as stated above, the brake assemblies can be offset from this position, for example by up to plus or minus 20 or 10 degrees.
By way of illustration, Figure 4 shows a graph illustrating the relationship between different brake calliper separation angles for a dual brake calliper arrangement and the reduction in radial force on a brake disc, where the Y axis represents radial forces on the rotor and brake disc and the X axis represents the calliper separation angle.
Accordingly, as the brake calliper separation angle decreases the radial forces on the brake disc and rotor increases.
The relationship between brake calliper separation angles for a dual brake calliper arrangement and the reduction in radial force on a brake disc and rotor illustrated in Figure 4 is based on each brake calliper imparting substantially similar brake forces. However, the brake calliper sizes, and hence braking torque generated by each brake calliper, can be varied with respect to each other to change the relationship between brake calliper separation angle and radial force.
To reduce space requirements the brake assembly 270 illustrated in Figure 3 has a sliding calliper arrangement, as is well known to a person skilled in the art. However, a fixed calliper arrangement could be used in an alternative embodiment (not shown) The brake assembly 270 includes a carrier 310 mounted to the rear portion 230 of the stator. The carrier 310 is arranged to support a brake calliper 320. The brake calliper 320 is a U shaped element arranged to surround the inner edge of the annular disc 260. The brake calliper 320 is mounted to the carrier 310 in a manner that allows the brake calliper 320 to slide relative to the carrier 310 in an axial direction.
A recess is formed on an inner face of the calliper 320 facing the outer surface of the annular brake disc that is axially in-board of the rotor. A piston is mounted in the recess. A first brake pad 340 is mounted on the piston with a second brake pad 360 being mounted on an inner surface of the calliper 320 that faces an opposite surface of the annular brake disc 260 to that of the piston 330. This allows both brake pads 340, 360 to be separated from each other by the annular brake disc 260 with one brake pad facing one side of the annular brake disc and a second brake pad facing the other side of the annular brake disc. The brake pads 340, 360 are arranged to impart a tangential force (i.e. a braking force) to the annular disc 260 when the brake pads 340, 360 are pressed against the annular disc 260.
As is well known to a person skilled in the art, to apply a braking force to the annular brake disc 260, hydraulic fluid is used to apply a force between the piston and the calliper 310 to cause the brake pads 340, 360 to be brought into contact with the annular brake disc 260, thereby applying a braking force to the annular brake disc 260.
As stated above, the brake assemblies 270 are mounted on the rear portion 230 of the stator so that the respective brake pads for each of the brake assemblies 270 apply a brake force to the annular brake disc, which in the present embodiment are at substantially diametrically positions on the annular disc. Each brake assembly is arranged to provide a tangential reaction force that is substantially equal in magnitude and opposite in direction to the other brake assembly. However, as stated above, the brake callipers can be arranged to provide different tangential forces on the annular brake disc 260.
The use of two brake assemblies 270, which are arranged to provide brake forces at substantially diametrically opposite points on the annular brake disc 260, allows brake forces applied to the annular brake disc 260to be balanced, thereby reducing the radial distortion forces placed upon the electric motor's rotor. Consequently the brake system only generates small radial reaction force on the rotor when full braking torque is being applied to the annular brake disc by the brake assemblies. However, as stated above, the two brake assemblies 270 can be arranged to apply a braking force to the annular disc 260 at positions other than substantially diametrically opposite positions, where the preferred positions are within the range of 170 and 190 degrees apart.
Although the above embodiment is described as having the annular brake disc 260 being mounted to the rotor with the brake assemblies 270 being mounted to the stator, in an alternative embodiment the annular brake disc 260 could be mounted to the stator with the brake assemblies 270 being mounted to the rotor.
Figure 2 shows an exploded view of the same assembly as Figure 1 from the opposite side showing the stator comprising the rear stator wall 230 and coil and electronics assembly 231. The rotor comprises the outer rotor wall 220 and circumferential wall 221 within which magnets 242 are circumferentially arranged. As previously described, the stator is connected to the rotor via the bearing block 223 at the central portions of the rotor and stator walls.
Additionally shown in Figures 1 and 2 is a V shaped seal 350 provided between the circumferential wall 221 of the rotor and the outer edge of the stator housing 230. Further, in Figure 1, the magnetic ring 227 comprising a commutation focusing ring and a plurality of magnets is provided for the purpose of indicating the position of the rotor with respect to the stator.
It will be apparent to those skilled in the art that the disclosed subject matter may be modified in numerous ways and may assume embodiments other than the preferred forms specifically set out as described above, for example the brake calipers could be mounted so that they surround the outer edge of the annular brake disc and/or one or more of the brake assemblies could be electro mechanical brake assemblies in preference to hydraulic brake assemblies.

Claims (10)

  1. CLAIMS1. An electric motor for mounting within a wheel of a vehicle, the electric motor comprising a rotor, a stator, an annular disc and a first and second brake device, wherein the rotor is mounted to the stator with means to allow rotation of the rotor with respect to the stator and the first and second brake devices are operable to inhibit rotation of the rotor with respect to the stator by applying a braking force on the annular disc.
  2. 2. An electric motor according to claim 1, wherein the first and second brake devices are arranged to inhibit rotation of the rotor with respect to the stator by the second brake device being arranged to apply a brake force on the annular disc at a point between 160 and 200 degrees from the force applied by the first braking device.
  3. 3. An electric motor according to claim 1, wherein the first and second brake devices are arranged to inhibit rotation of the rotor with respect to the stator by applying a braking force at substantially diametrically opposite positions on the annular disc.
  4. 4. An electric motor according to any one of the preceding claims, wherein the annular disc is mounted to the rotor and the first and second brake devices are mounted to the stator.
  5. 5. An electric motor according to claim 4, wherein the first and second brake devices are mounted on the stator at an inner radius to that of the inner diameter of the annular disc.
  6. 6. An electric motor according to any one of claims 1 to 3, wherein the annular disc is mounted to the stator and the first and second brake devices are mounted to the rotor.
  7. 7. An electric motor according to any one of the preceding claims, wherein the first and second brake devices are brake callipers arranged to clamp friction material against the annular disc.
  8. 8. An electric motor according to claim 7, wherein the brake callipers are sliding brake callipers.
  9. 9. An electric motor according to claims 7 or 8, wherein the brake callipers are electro-mechanical brake callipers.
  10. 10. An electric motor according to any one of the preceding claims, further comprising mounting points for a wheel, wherein the annular disc and first and second brake devices are mounted on an opposite side of the electric motor to the mounting points for the wheel.
GB201007060A 2010-04-28 2010-04-28 An electric motor brake system Active GB2479898B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201007060A GB2479898B (en) 2010-04-28 2010-04-28 An electric motor brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201007060A GB2479898B (en) 2010-04-28 2010-04-28 An electric motor brake system

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GB201007060D0 GB201007060D0 (en) 2010-06-09
GB2479898A true GB2479898A (en) 2011-11-02
GB2479898B GB2479898B (en) 2012-10-10

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104842733A (en) * 2015-05-15 2015-08-19 中国科学院深圳先进技术研究院 Electric vehicle suspension system based on hub direct drive motor
WO2020192820A3 (en) * 2019-03-26 2020-11-19 Schaeffler Technologies AG & Co. KG Electric wheel drive unit for driving a wheel of a motor vehicle
US11591032B1 (en) * 2021-12-09 2023-02-28 Workhorse Group Inc. Land vehicles incorporating brake systems and methods therefor
GB2619268A (en) * 2022-04-28 2023-12-06 Barr Kevin Multi component vehicle accessorie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330045A (en) * 1979-09-14 1982-05-18 Reliance Electric Company Vehicle wheel mechanism
GB2389827A (en) * 2002-06-18 2003-12-24 Magnetic Systems Technology Lt Hub drive system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330045A (en) * 1979-09-14 1982-05-18 Reliance Electric Company Vehicle wheel mechanism
GB2389827A (en) * 2002-06-18 2003-12-24 Magnetic Systems Technology Lt Hub drive system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104842733A (en) * 2015-05-15 2015-08-19 中国科学院深圳先进技术研究院 Electric vehicle suspension system based on hub direct drive motor
CN104842733B (en) * 2015-05-15 2017-04-05 中国科学院深圳先进技术研究院 A kind of electric automobile suspension system based on hub direct-drive motor
WO2020192820A3 (en) * 2019-03-26 2020-11-19 Schaeffler Technologies AG & Co. KG Electric wheel drive unit for driving a wheel of a motor vehicle
US11591032B1 (en) * 2021-12-09 2023-02-28 Workhorse Group Inc. Land vehicles incorporating brake systems and methods therefor
US11884344B2 (en) 2021-12-09 2024-01-30 Workhorse Group Inc. Land vehicles incorporating brake systems and methods therefor
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