EP4162596A1 - Permanent magnet electric machine with multiple coaxial rotors - Google Patents

Permanent magnet electric machine with multiple coaxial rotors

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Publication number
EP4162596A1
EP4162596A1 EP21755047.4A EP21755047A EP4162596A1 EP 4162596 A1 EP4162596 A1 EP 4162596A1 EP 21755047 A EP21755047 A EP 21755047A EP 4162596 A1 EP4162596 A1 EP 4162596A1
Authority
EP
European Patent Office
Prior art keywords
rotors
electric machine
permanent magnets
stator
windings
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.)
Pending
Application number
EP21755047.4A
Other languages
German (de)
French (fr)
Inventor
Francesco Ricciardi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP4162596A1 publication Critical patent/EP4162596A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00—Medicinal preparations containing inorganic active ingredients
    • A61K33/06—Aluminium, calcium or magnesium; Compounds thereof, e.g. clay
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • A61K31/716—Glucans
    • A61K31/717—Celluloses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • A61K31/716—Glucans
    • A61K31/722—Chitin, chitosan
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • A61K31/734—Alginic acid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/16—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing nitrogen, e.g. nitro-, nitroso-, azo-compounds, nitriles, cyanates
    • A61K47/18—Amines; Amides; Ureas; Quaternary ammonium compounds; Amino acids; Oligopeptides having up to five amino acids
    • A61K47/183—Amino acids, e.g. glycine, EDTA or aspartame
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/24—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing atoms other than carbon, hydrogen, oxygen, halogen, nitrogen or sulfur, e.g. cyclomethicone or phospholipids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
    • A61K47/34—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyesters, polyamino acids, polysiloxanes, polyphosphazines, copolymers of polyalkylene glycol or poloxamers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/02—Drugs for dermatological disorders for treating wounds, ulcers, burns, scars, keloids, or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/10—Antimycotics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil

Definitions

  • the present invention is generally applicable to the technical field of electric motors and particularly relates to an electric machine with permanent magnets provided with a plurality of rotors placed concentrically with each other, which can be used both as a motor and as a generator.
  • permanent magnet motors constitute a particular type of electric motors having multiple applications and which find more and more space within traction and movement systems of vehicles, such as electric bicycles, cars, drones, boats, but also inside industrial machines, thanks to their capacity of producing a very high torque and speed, with a yield that can exceed 90%.
  • Permanent magnet motors essentially consist of a rotor provided with two or more permanent magnets and connected to a transmission shaft and a stator provided with windings for generating the rotating magnetic field.
  • a permanent magnet motor may have two different shapes.
  • a first configuration defined “ in runner ”, or with internal rotor, the rotor is placed inside the stator, while in the configuration called “out runner”, the rotor is placed externally to the stator.
  • This last configuration has the advantage of reducing the overall dimensions as a possible wheel can be mounted directly on the external rotor, avoiding having to use motion transmission systems.
  • known permanent magnet motors use an electronic controller to manage the electrical impulses sent to the windings on the stator, to create the rotating magnetic field that moves the rotor.
  • controllers or control units using various technologies, are adapted to recognize the position of the rotor, so as to send the correct electrical impulse at the right time, with the aid of sensors on the stator.
  • Such sensors can be, for example, of the magnetic type, or with hall effect or optical. Alternatively, it is also possible not to provide the sensors and in this case the position of the rotor is recognized by the return electromotive force.
  • the object of the present invention is to overcome the above drawbacks, by providing an electric machine with permanent magnets, which can be used as an electric motor or as a generator, characterized by high efficiency.
  • a particular object is to provide an electric machine with permanent magnets having a higher efficiency in terms of torque and speed and a lower absorption than those currently available, so as to make it ideal for a very large number of industrial applications.
  • a particular object is to provide an electric machine with permanent magnets having a structure which provide it with a substantial efficiency increase with the same absorption and size compared to currently available permanent magnet motors or generators.
  • an electric machine with permanent magnets with multiple rotors which, according to claim 1, comprises at least two mutually coaxial rotors and each provided with two or more permanent magnetic poles associated with the side wall thereof, at least one stator provided with windings with respective electrical output contacts and interposed between two of said rotors to be powered with current and generate a rotating electromagnetic field adapted to rotate the corresponding rotors, a transmission shaft mechanically connected to said rotors to be driven into rotation upon the rotation of said rotors promoted by said at least one stator.
  • a permanent magnet electric motor or generator which motor or generator combining the features of an “in runner ” type motor/generator with those of an “ out runner ” type motor/generator, being adapted to use both the magnetic poles of the windings.
  • each magnetic circle receives a thrust from both sides of each winding, so that each of the magnetic surfaces of each rotor exposed to the winding of the stator is equivalent to a rotor.
  • Fig. 1 is a simplified perspective view of the electric machine according to the invention
  • Fig. 2 is a perspective view of the electric machine of Fig. 1 without a cover for viewing inside it;
  • Fig. 3 is a schematic top view of the electric machine according to the invention.
  • a preferred but not exclusive configuration of a permanent magnet electric machine according to the invention is schematised, which can be used as an electric motor or as an electric generator.
  • the machine globally indicated with 1, essentially comprises two or more rotors 2, 3, 4, 5 mutually coaxial and each provided with one or more permanent magnets, eight for each rotor in the illustrated configuration and genetically indicated with 6, associated with their wall lateral.
  • each rotor may also vary with respect to what has been illustrated and in theory it will be sufficient for each rotor to be provided with at least one pair of poles of opposite sign.
  • Each pair of mutually coaxial rotors 2-3; 3-4; 4-5 defines a gap 7, 8, 9 housing a respective stator 10, 11, 12 provided with respective windings and having respective electrical output contacts 13, 14, 15 for the current supply of the corresponding stator 10-12 in order to generate a respective rotating electromagnetic field adapted to rotate the corresponding rotors 2-5.
  • the latter are mechanically connected to a common transmission shaft 16 adapted to be driven into rotation upon the rotation of the rotors 2-5 promoted by the stators 10-
  • rotors or magnetic circles 2-5 there are four rotors or magnetic circles 2-5, but they could also be in a higher number, all concentric and coaxial with each other and arranged substantially on the same plane, so that, with the exception of the innermost rotor 2 and outermost rotor 5, each of them is at the same time internal to another rotor of larger diameter and external to yet another rotor of smaller diameter.
  • Each rotor further comprises a side wall having an inner surface and an outer surface. Furthermore, each magnet 6 will be polarized along a radial direction so that the poles of opposite sign of each magnet 6 are arranged on opposite surfaces of the side wall of the respective rotor 2-5.
  • the magnets 6 can be caged in a circular structure integral with the respective rotor 2-5 and provided with relative housings for the magnets 6.
  • each of the permanent magnets 6 has a first pole arranged on one between the inner and outer surface of the corresponding rotor 2-5 and a second pole arranged on the other between the inner and outer surface of the corresponding rotor 2-5 so that the opposite poles of the same permanent magnet 6 face on opposite sides of the side wall of the corresponding rotor 2-5.
  • the mutually facing magnets 6 of two different rotors 2-5 adjacent to each other will be arranged so as to have their respective poles facing each other with opposite sign.
  • each permanent magnet 6, with the exception of the permanent magnets associated with the innermost rotor 2 and the outermost rotor 5, will interact with two different stators 8, 9.
  • each rotor 2-5 intended as a magnetic circle, will act both as an “ in runner ” and as an “o t runner ” and therefore as if there were two rotors for each magnetic circle.
  • the rotors 2-5 will all be coupled to a common transmission shaft 16 in a single rotating bell 17.
  • the stators 10-12 may be formed by a plurality of windings obtained by means of a plurality of cables (for example three cables) and provided with an air gap or self-supporting structure to be positioned together in a coaxial manner.
  • each cable is adapted to form a winding around the air gap or support structure on each of the stators 10-12, so that the stators 10-12 are powered by a single current which will put in motion all the rotors 2-5, contributing to the increase in performance.
  • Stators 10-12 will be positioned coaxially with each other, with the windings of each cable positioned opposite each other.
  • the windings of the stators 10-12 may be without an air gap, so as to obtain a range of motors/generators without ferromagnetic braking, for use, for example, as a wind generator, which can rotate even with a small breath of wind.
  • the cables forming the windings are joined in a star or delta wiring and, typically for this kind of electrical machines, the electrical output contacts 13-15 of the windings will be connected to a three-phase electronic control unit or driver, not illustrated, suitable for sending electrical impulses to stators 10-12 necessary create the rotating electromagnetic field.
  • control unit will be devoid of sensors and adapted to detect the position of the rotors 2-5 by reading the return electromotive force.
  • control unit can be provided with sensors positioned on the stator in angularly offset positions of 60° or 120°.

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Abstract

An electric machine with permanent magnets comprises at least two rotors (2-5) mutually coaxial and each provided with two or more permanent magnetic poles associated with their side wall, at least one stator (10-12) provided with windings with respective electrical output contacts (13-15) and interposed between two of said rotors (2-5) to be powered with current and generate a rotating electromagnetic field adapted to put into rotation the corresponding rotors (2-5), a transmission shaft (16) mechanically connected to said rotors (2-5) to be driven into rotation upon the rotation of said rotors (2-5) promoted by said at least one stator (10-12).

Description

PERMANENT MAGNET ELECTRIC MACHINE WITH MULTIPLE COAXIAL ROTORS
Description
Technical Field
The present invention is generally applicable to the technical field of electric motors and particularly relates to an electric machine with permanent magnets provided with a plurality of rotors placed concentrically with each other, which can be used both as a motor and as a generator.
State of the art
As known, permanent magnet motors constitute a particular type of electric motors having multiple applications and which find more and more space within traction and movement systems of vehicles, such as electric bicycles, cars, drones, boats, but also inside industrial machines, thanks to their capacity of producing a very high torque and speed, with a yield that can exceed 90%.
Permanent magnet motors essentially consist of a rotor provided with two or more permanent magnets and connected to a transmission shaft and a stator provided with windings for generating the rotating magnetic field.
Basically, especially for traction, a permanent magnet motor may have two different shapes.
In a first configuration, defined “ in runner ”, or with internal rotor, the rotor is placed inside the stator, while in the configuration called “out runner”, the rotor is placed externally to the stator.
This last configuration has the advantage of reducing the overall dimensions as a possible wheel can be mounted directly on the external rotor, avoiding having to use motion transmission systems.
Furthermore, known permanent magnet motors use an electronic controller to manage the electrical impulses sent to the windings on the stator, to create the rotating magnetic field that moves the rotor.
These controllers or control units, using various technologies, are adapted to recognize the position of the rotor, so as to send the correct electrical impulse at the right time, with the aid of sensors on the stator.
Such sensors can be, for example, of the magnetic type, or with hall effect or optical. Alternatively, it is also possible not to provide the sensors and in this case the position of the rotor is recognized by the return electromotive force.
Scope of the invention
The object of the present invention is to overcome the above drawbacks, by providing an electric machine with permanent magnets, which can be used as an electric motor or as a generator, characterized by high efficiency.
A particular object is to provide an electric machine with permanent magnets having a higher efficiency in terms of torque and speed and a lower absorption than those currently available, so as to make it ideal for a very large number of industrial applications. A particular object is to provide an electric machine with permanent magnets having a structure which provide it with a substantial efficiency increase with the same absorption and size compared to currently available permanent magnet motors or generators.
These objects, as well as others which will become more apparent hereinafter, are achieved by an electric machine with permanent magnets with multiple rotors which, according to claim 1, comprises at least two mutually coaxial rotors and each provided with two or more permanent magnetic poles associated with the side wall thereof, at least one stator provided with windings with respective electrical output contacts and interposed between two of said rotors to be powered with current and generate a rotating electromagnetic field adapted to rotate the corresponding rotors, a transmission shaft mechanically connected to said rotors to be driven into rotation upon the rotation of said rotors promoted by said at least one stator.
Thanks to this combination of features, a permanent magnet electric motor or generator will be provided, which motor or generator combining the features of an “in runner ” type motor/generator with those of an “ out runner ” type motor/generator, being adapted to use both the magnetic poles of the windings.
By further increasing the number of rotors, so as to have more than two, a multi-rotor electric machine will be provided, wherein each magnetic circle receives a thrust from both sides of each winding, so that each of the magnetic surfaces of each rotor exposed to the winding of the stator is equivalent to a rotor.
For example, in a motor/generator with four rotors or magnetic circles, six effective rotors will operate, wherein the outermost ones, being the farthest from the center, will impart an increasingly stronger thrust.
It follows that, by further increasing the number of magnetic circles, an increasingly effective motor/generator will be obtained, with ever higher performance and with ever lower consumption. Advantageous embodiments of the invention are obtained in accordance with the dependent claims.
Brief disclosure of the drawings
Further features and advantages of the object of the invention will become more apparent in the light of the detailed description of a preferred but not exclusive embodiment of the permanent magnet electric machine according to the invention, shown by way of non-limiting example with the aid of the attached drawing tables wherein:
Fig. 1 is a simplified perspective view of the electric machine according to the invention; Fig. 2 is a perspective view of the electric machine of Fig. 1 without a cover for viewing inside it;
Fig. 3 is a schematic top view of the electric machine according to the invention.
Best mode of carrying out the invention
With reference to the attached figures, a preferred but not exclusive configuration of a permanent magnet electric machine according to the invention is schematised, which can be used as an electric motor or as an electric generator.
The machine, globally indicated with 1, essentially comprises two or more rotors 2, 3, 4, 5 mutually coaxial and each provided with one or more permanent magnets, eight for each rotor in the illustrated configuration and genetically indicated with 6, associated with their wall lateral.
However, it is understood that the number of permanent magnets 6 may also vary with respect to what has been illustrated and in theory it will be sufficient for each rotor to be provided with at least one pair of poles of opposite sign.
Each pair of mutually coaxial rotors 2-3; 3-4; 4-5 defines a gap 7, 8, 9 housing a respective stator 10, 11, 12 provided with respective windings and having respective electrical output contacts 13, 14, 15 for the current supply of the corresponding stator 10-12 in order to generate a respective rotating electromagnetic field adapted to rotate the corresponding rotors 2-5.
The latter are mechanically connected to a common transmission shaft 16 adapted to be driven into rotation upon the rotation of the rotors 2-5 promoted by the stators 10-
12
For each pair of rotors 2-3; 3-4; 4-5 it will be possible to identify an outer rotor 3, 4, 5 and an inner rotor 2, 3, 4 facing each other and wherein the inner rotor is placed in the perimeter delimited by the respective outer rotor, coaxially and concentrically therewith.
In the illustrated embodiment, there are four rotors or magnetic circles 2-5, but they could also be in a higher number, all concentric and coaxial with each other and arranged substantially on the same plane, so that, with the exception of the innermost rotor 2 and outermost rotor 5, each of them is at the same time internal to another rotor of larger diameter and external to yet another rotor of smaller diameter.
Each rotor further comprises a side wall having an inner surface and an outer surface. Furthermore, each magnet 6 will be polarized along a radial direction so that the poles of opposite sign of each magnet 6 are arranged on opposite surfaces of the side wall of the respective rotor 2-5.
From a manufacturing point of view, the magnets 6 can be caged in a circular structure integral with the respective rotor 2-5 and provided with relative housings for the magnets 6.
In particular, each of the permanent magnets 6 has a first pole arranged on one between the inner and outer surface of the corresponding rotor 2-5 and a second pole arranged on the other between the inner and outer surface of the corresponding rotor 2-5 so that the opposite poles of the same permanent magnet 6 face on opposite sides of the side wall of the corresponding rotor 2-5.
Furthermore, the mutually facing magnets 6 of two different rotors 2-5 adjacent to each other will be arranged so as to have their respective poles facing each other with opposite sign.
In this way, each permanent magnet 6, with the exception of the permanent magnets associated with the innermost rotor 2 and the outermost rotor 5, will interact with two different stators 8, 9.
It follows that each rotor 2-5, intended as a magnetic circle, will act both as an “ in runner ” and as an “o t runner ” and therefore as if there were two rotors for each magnetic circle.
The rotors 2-5 will all be coupled to a common transmission shaft 16 in a single rotating bell 17.
In a particularly advantageous manner, the stators 10-12 may be formed by a plurality of windings obtained by means of a plurality of cables (for example three cables) and provided with an air gap or self-supporting structure to be positioned together in a coaxial manner.
In particular, each cable is adapted to form a winding around the air gap or support structure on each of the stators 10-12, so that the stators 10-12 are powered by a single current which will put in motion all the rotors 2-5, contributing to the increase in performance.
Stators 10-12 will be positioned coaxially with each other, with the windings of each cable positioned opposite each other.
The windings of the stators 10-12 may be without an air gap, so as to obtain a range of motors/generators without ferromagnetic braking, for use, for example, as a wind generator, which can rotate even with a small breath of wind.
The cables forming the windings are joined in a star or delta wiring and, typically for this kind of electrical machines, the electrical output contacts 13-15 of the windings will be connected to a three-phase electronic control unit or driver, not illustrated, suitable for sending electrical impulses to stators 10-12 necessary create the rotating electromagnetic field.
According to a preferred but not exclusive embodiment, the control unit will be devoid of sensors and adapted to detect the position of the rotors 2-5 by reading the return electromotive force.
Alternatively, the control unit can be provided with sensors positioned on the stator in angularly offset positions of 60° or 120°.
From the above it can be seen that the electric machine according to the present invention achieves the intended objects.

Claims

Claims
1. An electric machine with permanent magnets, characterized by comprising: at least two rotors (2-5) mutually coaxial and each provided with two or more permanent magnetic poles associated with their side wall; - at least one stator (10-12) provided with windings with respective electrical output contacts (13-15) and interposed between two of said rotors (2-5) to be powered with current and generate a rotating electromagnetic field adapted to put into rotation the corresponding rotors (2-5); a transmission shaft (16) mechanically connected to said rotors (2-5) to be driven into rotation upon the rotation of said rotors (2-5) promoted by said at least one stator (10-12).
2. Electric machine with permanent magnets as claimed in claim 1, characterized in that said rotors (2-5) are mutually concentric and placed one inside the other to define respective gaps (7-9) for housing said at least one stator (10-12).
3. Electric machine with permanent magnets as claimed in claim 1 or 2, characterized in that each of said rotors (2-5) comprises at least one magnet (6) magnetized in a radial direction and provided with said two poles, for each pair of said rotors (2-5) adjacent to each other being provided at least one pair of magnets (6) facing each other and arranged so as to have opposite poles of opposite sign.
4. Electric machine with permanent magnets as claimed in any preceding claim, characterized in that each of said rotors (2-5) comprises a side wall having an inner surface and an outer surface, each of said permanent magnets (6) having a first pole disposed on one of said inner and outer surface of the correspondent of said rotors (2- 5) and a second pole disposed on the other of said inner and outer surface of the correspondent of said rotors (2-5) so that the opposites poles of the same permanent magnet (6) face on opposite sides of the side wall of the corresponding one of said rotors (2-5).
5. Electric machine with permanent magnets as claimed in any preceding claim, characterized by comprising two or more pairs of mutually coaxial and concentric rotors (2-5), each of said pairs comprising an inner rotor and an outer rotor defining a respective gap (7-9) housing a respective stator (10-12).
6. Electric machine with permanent magnets as claimed in claim 5, characterized in that said rotors (2-5) are all coaxial and concentric with each other and arranged one inside the other.
7. Electric machine with permanent magnets as claimed in any preceding claim, characterized in that said rotors (2-5) are connected to a common transmission shaft (16) in a single rotating bell (17).
8. Electric machine with permanent magnets as claimed in any preceding claim, characterized in that said stators (10-12) are defined by a plurality of windings obtained from the same plurality of cables.
9. Electric machine with permanent magnets as claimed in claim 8, characterized in that said windings are provided with an air gap or self-supporting structure to be positioned together in a coaxial way, each of said cables being adapted to form a winding around said air gap or self-supporting structure on each part of said at least one stator (10-12), so that said stators (10-12) are powered with a single current.
10. Electric machine with permanent magnets as claimed in claim 8 or 9, characterized in that said windings are star-wired.
11. Electric machine with permanent magnets as claimed in claim 8 or 9, characterized in that one or more of said stators (10-12) are delta wired.
12. Electric machine with permanent magnets according to claim 10 or 11, characterized in that the windings of one or more of said stators (10-12) are devoid of air gap.
13. Electric machine with permanent magnets as claimed in any preceding claim, characterized by comprising a control unit connected to said electrical output contacts (13-15) of said windings for sending electrical impulses to said one or more stators (10-12).
14. Electric machine with permanent magnets as claimed in claim 13, characterized in that said control unit is devoid of sensors and adapted to detect the position of said rotors (2-5) by reading the return electromotive force.
15. Electric machine with permanent magnets as claimed in claim 13, characterized in that said control unit is provided with sensors positioned on the stator in angularly offset positions of 60° or 120°.
EP21755047.4A 2020-06-03 2021-06-02 Permanent magnet electric machine with multiple coaxial rotors Pending EP4162596A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202020000003040U IT202000003040U1 (en) 2020-06-03 2020-06-03 PERMANENT MAGNET MOTOR IN AND OUT RUNNER MULTI CONCENTRIC ROTOR.
PCT/IB2021/054831 WO2021245568A1 (en) 2020-06-03 2021-06-02 Permanent magnet electric machine with multiple coaxial rotors

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Publication number Priority date Publication date Assignee Title
EP0650246B1 (en) * 1992-07-09 2001-11-21 Seiko Epson Corporation Brushless motor
US5783894A (en) * 1995-10-31 1998-07-21 Wither; Thomas A. Method and apparatus for generating electrical energy
US6992419B2 (en) * 2002-06-26 2006-01-31 Amotech Co., Ltd. Brushless direct-current motor of radial core type having a structure of double rotors and method for making the same
DE102007050496A1 (en) * 2007-10-19 2009-04-23 Innovative Windpower Ag Generator for wind energy system, has stator with winding, which steps into reciprocal effect with magnet of rotor such that voltage is induced in winding during rotation of rotor, and another rotor with magnet
US8188633B2 (en) * 2009-01-05 2012-05-29 Eric Stephane Quere Integrated composite electromechanical machines
US8148928B2 (en) * 2009-06-30 2012-04-03 Semiconductor Components Industries, Llc Method for starting a brushless sensorless DC motor

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