WO1999065134A1 - Direct drive inside-out brushless roller motor - Google Patents

Direct drive inside-out brushless roller motor Download PDF

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Publication number
WO1999065134A1
WO1999065134A1 PCT/US1999/013145 US9913145W WO9965134A1 WO 1999065134 A1 WO1999065134 A1 WO 1999065134A1 US 9913145 W US9913145 W US 9913145W WO 9965134 A1 WO9965134 A1 WO 9965134A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
roller
brushless
rotor
stator
Prior art date
Application number
PCT/US1999/013145
Other languages
French (fr)
Inventor
Moe K. Barani
Ron Flanary
Lee Snider
Original Assignee
Aspen Motion Technologies, Inc.
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
Priority to US60/088,856 priority Critical
Priority to US16613998A priority
Priority to US09/166,139 priority
Application filed by Aspen Motion Technologies, Inc. filed Critical Aspen Motion Technologies, Inc.
Priority claimed from AU44346/99A external-priority patent/AU4434699A/en
Priority claimed from US09/700,447 external-priority patent/US6710505B1/en
Publication of WO1999065134A1 publication Critical patent/WO1999065134A1/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
    • H02K7/1012Machine arranged inside the pulley
    • H02K7/1016Machine of the outer rotor type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00Special constructions of feed or guide rollers and surfaces thereof
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00Parts for transporting or guiding the handled material
    • B65H2404/10Rollers
    • B65H2404/11Details of cross-section or profile
    • B65H2404/115Details of cross-section or profile other
    • B65H2404/1152Markings, patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00Parts for transporting or guiding the handled material
    • B65H2404/10Rollers
    • B65H2404/16Details of driving
    • B65H2404/162Details of driving containing, enclosing own driving means

Abstract

A brushless d.c. motor is integrated with a conveyor roller (14) by placing a plurality of stator coils (15) on a stationary shaft (18) and securing a rotor (10) with segments (12) of permanent magnetic material to the inside of the conveyor roller (14). In one embodiment the rotor (10) is directly secured to the roller while in a second embodiment, the rotor (10) is disposed inside of a cylindrical metal housing (40) that is press fit inside of the roller. Commutation is provided by an external motor controller (54) which is connected by conductors (37) through a passageway (36) in the shaft (18) to a circuit board (20), where sensors (23) are mounted to sense rotor position for purposes of commutation of the stator coils (15).

Description

DIRECT DRIVE INSIDE-OUT BRUSHLESS ROLLER MOTOR

FIELD OP THE INVENTION

This invention relates to an improved motor driven roller in which the motor is located inside the roller and, more particularly, to such a motor driven roller in which the motor directly drives the roller.

DESCRIPTION OF THE PRIOR ART

Motor-driven rollers are used in a variety of applications. Among these applications are the rollers used in exercise treadmills and in material handling conveyors. The specific embodiment of the invention, described in this patent specification, is directed to a conveyor application. However, it will be appreciated the invention is applicable to motor driven rollers used in other systems, such as treadmills.

In a widely used prior art motor driven conveyor roller, a brushless, permanent magnet, d.c. motor is housed inside the roller itself. The motor, which is necessarily limited in size, has a relatively low torque. Typically, a conveyor roller has an inside diameter of less than two inches. A reducing gear is needed to couple the motor rotor to the roller in order to generate the torque required for the conveyor roller application. A resilient clutch is used to uncouple the motor from the roller in those situations where the roller becomes stuck. While generally satisfactory, the reducing gear requires maintenance and is subject to breaking down, which requires disassembly of the roller and repair or replacement of the broken parts . SUMMARY OF THE INVENTION

An object of this invention is the provision of an electronically controlled, high torque d.c. motor assembly housed inside the roller and directly connected to it, which eliminates the need for a reduction gear and a clutch control used in the prior art.

Briefly, this invention contemplates the provision of a motorized roller in which a cylindrical permanent magnet is secured to the inside surface of the roller. Longitudinal segments are magnetized to form poles of alternate north and south magnetic polarity. These magnet poles are the rotor of an inside-out brushless d.c. motor, the stator of which is formed by coils in slots in a toothed structure mounted on a stationary shaft about which the permanent magnet rotor and the roller to which it is attached rotates. Preferably, the number of rotor poles is, or is close to, the maximum number of poles that can be formed about the circumference of the cylindrical permanent magnet, given the constraint on the diameter of the permanent magnet since it much fit within the roller, and the constraint of practical manufacturing limitations. Increasing the number of magnetic poles decreases the required thickness of the back iron which is needed to generate a high flux density in the air gap, which in turn is necessary to generate a high torque output per unit volume. It will be appreciated that the required back iron thickness is approximately equal to the ratio of the number of magnetic flux lines per pole to the acceptable back iron flux density level. As the number of poles increases, the magnetic lines per pole decrease, since the magnetic flux is evenly distributed among the poles.

The stator coils are electronically commutated to provide brushless operation. One end of the stator shaft extends beyond the end of the roller and is secured to a suitable frame member. Wires in a passage in the shaft carry current to the coils. Preferably, six-step switching is used to commutate the stator coils and the commutation angle can be advanced as the motor speed increases in order to maintain a desired torque. In one embodiment, the motor extends the length of the roller. In another embodiment, the motor extends for only a part of the length of the roller. The permanent magnet in which the poles are formed may be secured to the inside of the roller by means of a suitable adhesive. Here, the roller itself serves as the back iron to provide a low reluctance path to complete the magnetic circuit between adjacent poles. In another embodiment, the entire motor assembly is secured in a metal housing, which is then secured to the roller by force fit or other suitable means. Here the metal housing serves as the back iron member.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of a preferred embodiment of the invention in which:

Fig. 1 is a longitudinal, sectional view of one embodiment of motor and roller combination in accordance with the teachings of the invention.

Fig. 1A is a transverse sectional view taken in the plane indicated by line 1A--1A in Fig. 1.

Fig. IB is an enlarged fragmentary view of a portion of Fig. 1A.

Fig. 2 is a longitudinal, sectional view of a second embodiment of the motor and roller combination in accordance with the teachings of the invention.

Fig. 2A is a transverse sectional view taken in the plane indicated by line 2A--2A in Fig. 2.

Fig. 3 is a schematic view of a modified form of the roller and motor combination of either Fig. 1 or Fig. 2 in which the motor extends for only a part of the length of the roller.

Fig. 4 is a schematic view similar to Fig. 3 where the motor extends substantially the entire length of the roller.

Fig. 5 is a schematic drawing of a control system for the roller motor of a conveyor roller driven by an inside- out, brushless, permanent magnet, d.c. motor in accordance with the teachings of this invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to Figs. 1 and 1A, in this embodiment of the invention, a cylinder 10 having a plurality of permanent magnets 12 is secured to the inside surface of a conveyor roller 14 by a suitable adhesive, for example. The thickness "t" of a typical conveyor roller wall is approximately roughly 1/16 of an inch. The permanent magnets 12 may be of any suitable magnetic material, such as neodium-iron-boron. As illustrated in Fig. 1A, longitudinal segments 12 of the cylinder 10 are magnetized to form magnetic poles with adjacent segments of opposite magnetic polarity, as indicated by the letters N and S in Fig. IB. The magnetized segments 12 are separated by narrow gaps of material 13 that are not magnetized under ordinary operating conditions. Since the magnetic flux generated by the cylinder 10 is a function of its surface area (i.e. Magnetic Flux = Magnetic Flux Density X Magnet Area) , it will be appreciated this configuration provides a large magnetic surface area and hence a large magnetic flux. A laminated toothed member 16, which is affixed to a shaft 18, is separated from the inner surfaces of cylinder 10 by an air gap 19. Stator coils 15 are disposed in slots 22 formed by teeth 26. The coils 15 each have at least thirteen turns, with only one turn per coil being shown for illustration purposes. Each coil 15 encircles only a single tooth 26. The coils 15 carry current supplied in three phases, A, B and C. In a preferred embodiment of the invention, a three-phase stator is used, with four coils per phase and two coil half-sections in each slot 22. Slot 1 is designated SI in Figs. 1A and 2A. Slot 1 is located between "tooth 12" and "tooth 1" of the stator 16. The phase A coils are disposed in the slots 22 to encircle "tooth 12" , "tooth 1", "tooth 6" and "tooth 7." The phase B coils are disposed in the slots 22 to encircle "tooth 2", "tooth 3", "tooth 8" and "tooth 9". The phase C coils are disposed in the slots 22 to encircle "tooth 4", "tooth 5", "tooth 10" and "tooth 11".

The motor of the present invention develops a high back EMF so as to provide a higher ratio of stator voltage to rotor speed than the prior art. In the prior art, this ratio was about 1.5. In a preferred embodiment, according to Fig. 3, in which the stator is three inches long, and in which each stator coil has at least 13 turns of 21 AWG guage wire per coil, a ratio of 10 RMS volts per 1000 RPM of rotor speed can be obtained, with the nominal stator voltage on each of the three phases being a 24 -volt RMS PWM signal. By varying the number of turns, other guages of wire will provide the same results. If the nominal stator voltage were doubled to 48 RMS volts, then this ratio would be doubled to 20 RMS volts per 1000 RPM to provide suitable performance .

The coils are electronically co mutated, for example, by a six-step commutation control algorithm. Although six- step commutation is preferred, other types of commutation including sine wave commutation may be employed. Here it will be appreciated this brushless commutation requires a means to determine the angular position of the rotor with respect to the stator coils 15. Three Hall effect sensors 23 are angularly spaced 120° apart and are supported on an annular circuit board 20. As the pole segments 12 pass by, sets of three signals are provided from the Hall effect sensors 23, and these three-signal sets are decoded to determine angular position signals which are then used for controlling commutation.

The number of pole segments 12 is preferably made as large as it is practical to manufacture without reducing the magnetizable area. For example, with the inside diameter of the magnetic cylinder 10 on the order of one inch, it is practical to form about twelve pole piece segments. By increasing the number of poles, for a given flux density, the thickness of the back iron required of a low reluctance magnetic flux return path is decreased so that the roller 14 can provide this function, resulting in an increased torque output per unit volume . As the number of poles increases, the flux lines per pole decreases, since the density is distributed evenly among the number of poles. Consequently, the thickness of the back iron decreases as the number of poles increases . The minimum number of poles for any motor is two. The ratio of the back iron thickness for a two pole to the back iron thickness for a motor with "N" poles is approximately N divided by 2. In order to keep the overall diameter of the motor sufficiently small to fit inside the rollers, while at the same time generating sufficient torque directly to drive the motor, at least six poles and preferably ten poles (as illustrated) should be used. The shaft 18 extends outwardly from the roller so that it can be secured to the frame of the conveyor. The outer peripheral surfaces of a pair bearings 30 and 32 at this end of the shaft are affixed to the inner surface of the roller 14. The outer peripheral surface of another bearing 34, at the other end of the shaft 18, is also affixed to the inner surface of the roller 14. These bearings are all rotatably mounted on the shaft 18 and allow the permanent magnet 10 along with the roller 14 to which it is affixed to rotate relatively to the fixed shaft 18 while maintaining the air gap 19 between the inner surface of the magnets and the outer periphery of toothed member 16. Conductors 37 are disposed in a passageway 36 in the shaft 18, including three phase conductors to provide power to the stator coils 15 from an external power source.

Referring now to Figs. 2 and 2A, in which like reference numbers have been used to designate like parts in Fig. 1, in this embodiment of the invention, the roller motor is first assembled in a cylindrical metal housing 40 which, in turn, is secured to the inner surface of the roller 14. The thickness of the wall of the housing is preferably minimized in order to maximize the diameter of the cylinder 10 which in turn maximizes torque. In a preferred embodiment, the housing 40 is secured to the roller 14 by a forced friction fit between the outer surface of the housing 40 and the inner surface of the roller 14 for at least a portion of their lengths. That is, the nominal outside diameter of the housing is slightly larger than the nominal inside diameter of the roller for at least a portion of their lengths. The housing 40 is closed at one end and a bearing 42 rotatably supports this end of the housing on the shaft 18. In lieu of the press fit, adhesive may be used to secure the housing 40 to the roller 14, or the adhesive may be used in addition to the press fit. In this embodiment of the invention, the housing 40 provides the back iron path for the pole segments 12. Referring now to Fig. 3, in one embodiment of the invention the motor (here indicated by the reference number 46) extends only for part of the length of the roller 14, which is supported by frame members 48. The shaft 18 in this embodiment needs to extend the length of the roller, but may be supported by a bearing 47 inside the roller. The other side of the roller 14 is supported by a shaft 49 affixed to the frame 48 and a bearing 50 rotatable about the shaft and affixed to the roller 14.

In the embodiment of Fig. 4, the motor 46 does extend substantially the entire length of the roller. Here it will be appreciated the volume of the motor increases, and the torque which it can generate, which is a function of volume, also increases.

Fig. 5 is a schematic diagram illustrating one embodiment of how the roller motor can be energized. Here a six-step commutating controller 52 connects a three-phase power supply 54 to the motor's stator coils (shown in Figs. 1 and 2) through three phase conductors 55 entering through the shaft of the roller 14. The rotor position sensors 23 (for example a Hall effect sensor) (shown in Figs. 1 and 2) provide commutating signals to controller 52 through three sense lines 57. A current sensing line 56 provides a signal to the controller 52 to indicate when a roller is stuck (i.e. the input current excess a predetermined threshold) so that the controller can cut off power to the jammed roller. If desired, the controller 52 can provide short duration power pulses to the motor after power has been cut off, to see if the roller has become freed, and if it has to resume supplying power to the motor.

While the invention has been described in terms of a single preferred embodiment, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims .

Claims

CLAIMS We claim:
1. A brushless d.c. motor for driving a cylindrical roller that rotates around a stationary shaft, the motor being characterized by: a cylindrical rotor disposed inside of and mounted to rotate with said cylindrical roller around said stationary shaft; wherein said rotor is formed of a plurality of longitudinal segments of permanent magnetic material, wherein said segments alternate orientation of north- south magnetic polarity in a radial direction to produce flux in flux path loops connecting pairs of the longitudinal segments; and a plurality of stator coils mounted on said shaft for receiving current from an external power supply that commutates current in said stator coils.
2. The brushless d.c. motor of claim 1, further characterized by: a cylindrical metal housing disposed in said roller and secured thereto; and further characterized in that said rotor is disposed inside of and secured to said cylindrical metal housing.
3. The brushless d.c. motor of claim 2, further characterized in that said roller is secured to said cylindrical metal housing at least in part by a force fit.
4. The brushless d.c. motor of claim 1 or 2 , further characterized in that said rotor and said plurality of stator coils extend part way in an elongated direction of said roller.
5. The brushless d.c. motor of claim 1 or 2 , further characterized in that said rotor and said plurality of stator coils extend substantially an entire length of said roller.
6. The brushless d.c. motor of claim 1 or 2 , further characterized in that said plurality of poles includes at least six poles formed in said cylindrical member as longitudinal segments with segments of alternating north-south magnetic polarity with said roller providing a magnetic path between segments.
7. The brushless d.c. motor of claim 1 or 2 , further characterized in that said rotor is connected to directly drive said roller without the use of a reduction gear assembly.
8. The brushless d.c. motor of claim 1 or 2 , further characterized in that the stator coils are formed of a sufficient number of turns of a sufficiently narrow guage wire to produce a ratio of stator voltage to speed of at least 10 RMS volts per 1000 RPM for an applied stator voltage of 24 RMS volts per phase.
9. The brushless d.c. motor of claim 8, wherein the stator has a plurality of teeth, and further characterized in that each stator coil encircles a single stator tooth.
10. The brushless d.c. motor of claim 1 or 2 , further characterized by sensor means for detecting a rotational position of the rotor.
PCT/US1999/013145 1998-06-11 1999-06-11 Direct drive inside-out brushless roller motor WO1999065134A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US60/088,856 1998-06-11
US16613998A true 1998-10-02 1998-10-02
US09/166,139 1998-10-02

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU44346/99A AU4434699A (en) 1998-06-11 1999-06-11 Direct drive inside-out brushless roller motor
EP99927446A EP1086522A1 (en) 1998-06-11 1999-06-11 Direct drive inside-out brushless roller motor
US09/700,447 US6710505B1 (en) 1998-06-11 1999-06-11 Direct drive inside-out brushless roller motor

Publications (1)

Publication Number Publication Date
WO1999065134A1 true WO1999065134A1 (en) 1999-12-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/013145 WO1999065134A1 (en) 1998-06-11 1999-06-11 Direct drive inside-out brushless roller motor

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WO (1) WO1999065134A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001052386A2 (en) * 2000-01-12 2001-07-19 Mol Belting Company Electric motor with external rotor
FR2810656A1 (en) * 2000-06-27 2001-12-28 Otis Elevator Co Actuator for lift cabin doors has motor driven roller mounted on rail on cabin to drive doors
US6710491B2 (en) * 2001-10-30 2004-03-23 Tonic Fitness Technology, Inc. Roller device with dynamic function
US6879078B2 (en) 2000-01-12 2005-04-12 Neodrive Llc Electric motor with external rotor
WO2010040395A1 (en) * 2008-10-08 2010-04-15 Sidel S.P.A. Motorized roll for labelling machines and labelling machine comprising such a roll
WO2011029120A1 (en) 2009-09-14 2011-03-17 Tgw Mechanics Gmbh Conveyor roller and conveyor for conveying material to be conveyed
JP6002874B1 (en) * 2016-01-29 2016-10-05 ユニ・チャーム株式会社 Conveying roller, apparatus having conveying roller, and conveying method
US10017325B2 (en) 2016-03-21 2018-07-10 Kamran Ramezani Hollow shaft direct drive motor
US10093483B2 (en) 2016-05-23 2018-10-09 Hilmot LLC Roller system having spaced apart external rotor motor
US10093487B2 (en) 2016-04-25 2018-10-09 Kamran Ramezani Motor shaped as a roller
US10131502B2 (en) 2016-04-03 2018-11-20 Kamran Ramezani Front and/or side mount motor
US10230315B2 (en) 2016-05-02 2019-03-12 Kamran Ramezani Use of battery as the DC power source in portable/expandable or fixed conveyors to drive DC motors
EP3703226A1 (en) * 2019-02-27 2020-09-02 Saurer (Jiangsu) Textile Machinery Co. Ltd. Winding roller with driving structure and textile machine using the same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434220A1 (en) * 1974-07-16 1976-01-29 Siemens Ag Sync. motor with external rotor - has aluminium squirrel cage with shorting rings and ferrite permanent magnets between outer friction drum and rotor core
US4116397A (en) * 1973-12-06 1978-09-26 Papst Motoren Kg Drive arrangement for yarn storage and dispensing units
DE3941823C1 (en) * 1989-12-19 1991-05-08 Zinser Textilmaschinen Gmbh, 7333 Ebersbach, De Ring spinning machine - has drawing systems with driven roll as bottom roll
US5030864A (en) * 1988-07-05 1991-07-09 U. S. Philips Corporation Three-phase electrical machine with reduced cogging torque
JPH04161050A (en) * 1990-10-23 1992-06-04 Tokyo Electric Co Ltd Bar-shaped stepping motor
US5145169A (en) * 1989-10-11 1992-09-08 Sankyo Manufacturing Company, Ltd. Roll feed device
US5524805A (en) * 1988-06-14 1996-06-11 Kabushikigaisha Tokyo Kikai Seisakusho Web feed roller and drive control system thereof
WO1998004801A1 (en) * 1996-07-25 1998-02-05 Inventio Ag Door drive
DE29802297U1 (en) * 1998-02-11 1998-04-16 Roland Man Druckmasch Brushless DC motor
US5918728A (en) * 1997-09-16 1999-07-06 Motion Systems, L.C.L.L.C. Gearless motorized roller with variable frequency controller

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116397A (en) * 1973-12-06 1978-09-26 Papst Motoren Kg Drive arrangement for yarn storage and dispensing units
DE2434220A1 (en) * 1974-07-16 1976-01-29 Siemens Ag Sync. motor with external rotor - has aluminium squirrel cage with shorting rings and ferrite permanent magnets between outer friction drum and rotor core
US5524805A (en) * 1988-06-14 1996-06-11 Kabushikigaisha Tokyo Kikai Seisakusho Web feed roller and drive control system thereof
US5030864A (en) * 1988-07-05 1991-07-09 U. S. Philips Corporation Three-phase electrical machine with reduced cogging torque
US5145169A (en) * 1989-10-11 1992-09-08 Sankyo Manufacturing Company, Ltd. Roll feed device
DE3941823C1 (en) * 1989-12-19 1991-05-08 Zinser Textilmaschinen Gmbh, 7333 Ebersbach, De Ring spinning machine - has drawing systems with driven roll as bottom roll
JPH04161050A (en) * 1990-10-23 1992-06-04 Tokyo Electric Co Ltd Bar-shaped stepping motor
WO1998004801A1 (en) * 1996-07-25 1998-02-05 Inventio Ag Door drive
US5852897A (en) * 1996-07-25 1998-12-29 Inventio Ag Door drive
US5918728A (en) * 1997-09-16 1999-07-06 Motion Systems, L.C.L.L.C. Gearless motorized roller with variable frequency controller
DE29802297U1 (en) * 1998-02-11 1998-04-16 Roland Man Druckmasch Brushless DC motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 459 (E - 1268) 24 September 1992 (1992-09-24) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001052386A3 (en) * 2000-01-12 2002-03-28 Mol Belting Co Electric motor with external rotor
US6879078B2 (en) 2000-01-12 2005-04-12 Neodrive Llc Electric motor with external rotor
US7337524B2 (en) 2000-01-12 2008-03-04 Neodrive Llc Method of forming a winding core for an electric motor
WO2001052386A2 (en) * 2000-01-12 2001-07-19 Mol Belting Company Electric motor with external rotor
FR2810656A1 (en) * 2000-06-27 2001-12-28 Otis Elevator Co Actuator for lift cabin doors has motor driven roller mounted on rail on cabin to drive doors
US6710491B2 (en) * 2001-10-30 2004-03-23 Tonic Fitness Technology, Inc. Roller device with dynamic function
WO2010040395A1 (en) * 2008-10-08 2010-04-15 Sidel S.P.A. Motorized roll for labelling machines and labelling machine comprising such a roll
WO2011029120A1 (en) 2009-09-14 2011-03-17 Tgw Mechanics Gmbh Conveyor roller and conveyor for conveying material to be conveyed
WO2017130380A1 (en) * 2016-01-29 2017-08-03 ユニ・チャーム株式会社 Conveyance roller, device having conveyance roller, and conveyance method
JP6002874B1 (en) * 2016-01-29 2016-10-05 ユニ・チャーム株式会社 Conveying roller, apparatus having conveying roller, and conveying method
US10017325B2 (en) 2016-03-21 2018-07-10 Kamran Ramezani Hollow shaft direct drive motor
US10131502B2 (en) 2016-04-03 2018-11-20 Kamran Ramezani Front and/or side mount motor
US10093487B2 (en) 2016-04-25 2018-10-09 Kamran Ramezani Motor shaped as a roller
US10230315B2 (en) 2016-05-02 2019-03-12 Kamran Ramezani Use of battery as the DC power source in portable/expandable or fixed conveyors to drive DC motors
US10093483B2 (en) 2016-05-23 2018-10-09 Hilmot LLC Roller system having spaced apart external rotor motor
EP3703226A1 (en) * 2019-02-27 2020-09-02 Saurer (Jiangsu) Textile Machinery Co. Ltd. Winding roller with driving structure and textile machine using the same

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