EP3084937A2 - Optimized synchronous reluctance motor assisted by permanent magnets - Google Patents

Optimized synchronous reluctance motor assisted by permanent magnets

Info

Publication number
EP3084937A2
EP3084937A2 EP14830671.5A EP14830671A EP3084937A2 EP 3084937 A2 EP3084937 A2 EP 3084937A2 EP 14830671 A EP14830671 A EP 14830671A EP 3084937 A2 EP3084937 A2 EP 3084937A2
Authority
EP
European Patent Office
Prior art keywords
reluctance motor
permanent magnet
synchronous reluctance
rotor
assisted synchronous
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.)
Withdrawn
Application number
EP14830671.5A
Other languages
German (de)
French (fr)
Inventor
Ezio Bertotto
Boris Karuzic
Davor Filipeti
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.)
ENERDRIVE LIMITED
Original Assignee
Drives And Motors d o o
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 Drives And Motors d o o filed Critical Drives And Motors d o o
Publication of EP3084937A2 publication Critical patent/EP3084937A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors

Definitions

  • the present invention refers to a permanent magnet-assisted synchronous reluctance motor with high performance.
  • the present invention refers to a permanent magnet-assisted synchronous reluctance motor of the optimised type with respect to conventional types of synchronous reluctance motors.
  • permanent magnet-assisted synchronous reluctance motors comprise a stator element, equipped with electrical windings defining pairs of poles, inside which, separated by a space called gap, there is a rotor that is suitable for being set in rotation around an axis.
  • the rotor which is substantially cylindrical, comprises permanent magnets.
  • the permanent magnets can be positioned at the external cylindrical surface of the rotor or inside it, in special seats.
  • the rotor does not have windings and has flux guides, i.e. minimum reluctance portions.
  • the rotor follows, in a "synchronous" manner, the rotation of the inductor magnetic field, set by a current that is suitably controlled through the stator windings, thanks to the preferential channelling of the magnetic flux along the portions of minimum reluctance of the rotor itself.
  • the number of poles, the amount and/or the type of the materials of the permanent magnets can vary.
  • the dimensions of the synchronous reluctance motor can vary, just like the production costs thereof can also vary.
  • ferrite also known as alpha-ferrite (a-Fe) or so-called “rare earths” Neodymium-Iron-Boron (NdFeB).
  • a permanent magnet that is made with "rare earths" for the same dimensions has a magnetic power that is greater with respect to a magnet that is made in ferrite.
  • the dimensions of the permanent magnets are greater, thus determining a possible increase in the overall dimensions of the rotor and, consequently, an increase in the dimensions of the synchronous reluctance motor.
  • a limitation in the use of rare earths for making the permanent magnets lies in the high procurement cost of the base material which, on average, is greater than that of ferrite by at least one order of magnitude.
  • the synchronous reluctance motors can be used in different applications, including applications in which it is foreseen to use partial load motors.
  • One purpose of the present invention is to improve the state of the art.
  • Another purpose of the present invention is to provide a permanent magnet- assisted synchronous reluctance motor with high performance with particular reference to partial load uses.
  • a further purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor with low production costs with respect to those of conventional types of synchronous motors.
  • Another purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor in which it is possible to optimise the amount of magnetic material used.
  • a permanent magnet- assisted synchronous reluctance motor is provided according to claim 1.
  • figure 1 is a schematic cross-section view of a permanent magnet- assisted synchronous reluctance motor, in which the main components have been illustrated;
  • figure 2 is a schematic perspective view of the rotor of a synchronous reluctance motor according to the present invention
  • figure 3 is a schematic cross-section view of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention
  • figure 4 is a schematic cross-section view of a further version of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention
  • figure 5 is a comparison graph between the efficiency curve of a PM brushless motor and that of a reluctance motor according to the present invention.
  • the permanent magnet-assisted synchronous reluctance motor 1 comprises a stator 2 defining a central seat inside which there is a rotating rotor 3.
  • stator windings At the peripheral portion inside the stator 2, which faces onto the rotor 3, there is a plurality of stator windings, wholly indicated with reference numeral 4.
  • Figure 2 illustrates, as a non-limiting example, an embodiment of a rotor 3.
  • the rotor 3 comprises a plurality of circular elements 5 that are adjacent to one another and one after the other so as to make a substantially cylindrical element.
  • the rotor 3 has a central axis of symmetry 12, around which it is set in rotation during operation of the permanent magnet-assisted synchronous reluctance motor 1.
  • Each circular element 5 has a central through opening 6, for housing a central shaft that is not illustrated in the figures, and a plurality of shaped seats 7.
  • the number and the arrangement of the shaped seats 7 can vary as a function of the number of poles of the synchronous reluctance motor 1.
  • the rotor 3 illustrated in figures 1-4 is provided for a synchronous reluctance motor 1 with four poles.
  • a synchronous reluctance motor 1 comprising a greater number of poles, for example six, eight, ten, twelve poles, etcetera, without for this reason departing from the scope of protection of the present invention.
  • the seats 7 are separated from one another by conveying portions 8.
  • Such conveying portions 8 constitute structural elements for each circular element 5. Furthermore, the conveying portions 8 define preferential paths, called “channels", along which the magnetic flux generated by the stator windings 4 is channelled.
  • the seats 7 allow permanent magnets 9, 10, 1 1 to be positioned, the number and the dimension of which varies as a function of the performance of the synchronous reluctance motor, for example with reference to the number of poles, to the power of the motor, etcetera.
  • the length of the permanent magnets 9, 10, 1 1 substantially extends for the same longitudinal length of the rotor 3.
  • Each seat 7 comprises a substantially rectilinear central portion 13, at which the permanent magnets 9 are positioned.
  • Figure 4 illustrates a further version of the present invention, in which inside the seats 7, at the central portion 13, the permanent magnets 1 1 in ferrite are positioned.
  • the permanent magnets 9, 10, 1 1 are positioned, in groups, which are aligned along the axes defining the poles of the permanent magnet-assisted synchronous reluctance motor 1.
  • the permanent magnets 9, 10, 1 1 are arranged in a symmetrical manner inside the rotor 3.
  • each permanent magnet 9, 10, 1 1 is substantially prism-shaped.
  • each permanent magnet 9, 10, 1 1 has a long side 14 and a short side 15.
  • the central portion 13 of each seat 7 has an elongated portion in the circumferential direction.
  • Each permanent magnet 9, 10, 1 1 is positioned inside a corresponding seat 7, with the long side 14 oriented parallel to the central portion 13.
  • a magnet in ferrite has greater dimensions with respect to a rare earth magnet of the type Neodymium-Ferrite-Boron ( dFeB).
  • the rotor 3 has seats 7 such as to be able to independently house permanent magnets 10 in NdFeB or permanent magnets in ferrite 1 1 with equal magnetic power.
  • a permanent magnet 1 1 in ferrite to be installed in one of the seats 7 is longer than a permanent magnet in NdFeB 10.
  • a permanent magnet-assisted synchronous reluctance motor 1 can be easily modified based upon the foreseen use, without needing to modify the overall structure of the entire motor. Indeed, it is sufficient to modify the type of permanent magnets 9, 10, 1 1 used.
  • a permanent magnet-assisted 9, 10, 1 1 synchronous reluctance motor 1 has an efficiency that is increased by around 20% with respect to a motor of the PM brushless (Permanent Magnet brushless) type of equal power.
  • Figure 5 illustrates, as an example but not for limiting purposes, a comparison graph between a curve of efficiency of a motor of the PM brushless type, of the power of around 7.5 kW, shown with a continuous solid line 16, and that of a permanent magnet-assisted reluctance motor 1 of equivalent power, according to the present invention, shown with a broken discontinuous line 17.
  • the curve 17 of the permanent magnet-assisted reluctance motor 1 according to the present invention is greater than the curve 16 of a PM brushless motor.
  • the efficiency of a permanent magnet-assisted reluctance motor 1 according to the present invention, for partial loads, is greater than that of a PM brushless motor of corresponding power.
  • the permanent magnet-assisted reluctance motor 1 according to the present invention and a PM brushless motor substantially have the same efficiency.

Abstract

A permanent magnet-assisted synchronous reluctance motor (1) comprises a stator (2) equipped with stator windings (4) defining a seat wherein a substantially cylindrical rotor (3) is positioned comprising a plurality of circular elements (5) adjacent to one another and one after the other, each of the circular elements (5) is equipped with a central axis of symmetry (12), the rotor (3) being rotary associated with respect to the stator (2) around the central axis of symmetry (12), the rotor (3) comprising seats (7), separated from one another by portions for conveying a magnetic flux (8), in which permanent magnets (9, 10, 11) are positioned in a number such as to determine a value of the phase difference between current and voltage for the permanent magnet- assisted synchronous reluctance motor (1) of cosφ comprised between 0.75 and 0.82.

Description

"OPTIMIZED SYNCHRONOUS RELUCTANCE MOTOR ASSISTED BY
PERMANENT MAGNETS"
TECHNICAL FIELD OF THE INVENTION
The present invention refers to a permanent magnet-assisted synchronous reluctance motor with high performance.
In particular, the present invention refers to a permanent magnet-assisted synchronous reluctance motor of the optimised type with respect to conventional types of synchronous reluctance motors.
STATE OF THE ART
As it is known, permanent magnet-assisted synchronous reluctance motors comprise a stator element, equipped with electrical windings defining pairs of poles, inside which, separated by a space called gap, there is a rotor that is suitable for being set in rotation around an axis.
The rotor, which is substantially cylindrical, comprises permanent magnets. According to different embodiments the permanent magnets can be positioned at the external cylindrical surface of the rotor or inside it, in special seats. The rotor does not have windings and has flux guides, i.e. minimum reluctance portions.
During operation of the synchronous reluctance motor the rotor follows, in a "synchronous" manner, the rotation of the inductor magnetic field, set by a current that is suitably controlled through the stator windings, thanks to the preferential channelling of the magnetic flux along the portions of minimum reluctance of the rotor itself.
As a function of the power required by the motor and of the type of use foreseen, the number of poles, the amount and/or the type of the materials of the permanent magnets can vary.
Based upon the type of material used for making the permanent magnets, with the same efficiency, the dimensions of the synchronous reluctance motor can vary, just like the production costs thereof can also vary.
In the group of the materials normally used for making the permanent magnets there are ferrite, also known as alpha-ferrite (a-Fe) or so-called "rare earths" Neodymium-Iron-Boron (NdFeB).
A permanent magnet that is made with "rare earths" for the same dimensions has a magnetic power that is greater with respect to a magnet that is made in ferrite.
Therefore, in the case in which ferrite is foreseen to be used, instead of rare earths, the dimensions of the permanent magnets are greater, thus determining a possible increase in the overall dimensions of the rotor and, consequently, an increase in the dimensions of the synchronous reluctance motor.
A limitation in the use of rare earths for making the permanent magnets lies in the high procurement cost of the base material which, on average, is greater than that of ferrite by at least one order of magnitude.
Moreover, the disposal of rare earth permanent magnets is more complex and costly than that of magnets in ferrite.
The synchronous reluctance motors can be used in different applications, including applications in which it is foreseen to use partial load motors.
In such a case, therefore, in addition to the normal operation parameters of the motor it is particularly important to evaluate the efficiency thereof with partial loads.
AIMS OF THE INVENTION
One purpose of the present invention is to improve the state of the art.
Another purpose of the present invention is to provide a permanent magnet- assisted synchronous reluctance motor with high performance with particular reference to partial load uses.
A further purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor with low production costs with respect to those of conventional types of synchronous motors. Another purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor in which it is possible to optimise the amount of magnetic material used.
In accordance with one aspect of the present invention a permanent magnet- assisted synchronous reluctance motor is provided according to claim 1.
The dependent claims refer to preferred and advantageous embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the present invention shall become clearer from the detailed description of a preferred but not exclusive embodiment of a permanent magnet-assisted synchronous reluctance electric motor, illustrated as an indication, and not for limiting purposes, in the attached drawing tables in which:
figure 1 is a schematic cross-section view of a permanent magnet- assisted synchronous reluctance motor, in which the main components have been illustrated;
figure 2 is a schematic perspective view of the rotor of a synchronous reluctance motor according to the present invention;
figure 3 is a schematic cross-section view of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention;
figure 4 is a schematic cross-section view of a further version of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention;
figure 5 is a comparison graph between the efficiency curve of a PM brushless motor and that of a reluctance motor according to the present invention.
EMBODIMENTS OF THE INVENTION
With reference to the attached figures, a permanent magnet-assisted synchronous reluctance motor is wholly indicated with reference numeral 1. The permanent magnet-assisted synchronous reluctance motor 1 according to the present invention comprises a stator 2 defining a central seat inside which there is a rotating rotor 3.
As it is known, between the stator 2 and the rotor 3 there is a small separation space called "air gap".
At the peripheral portion inside the stator 2, which faces onto the rotor 3, there is a plurality of stator windings, wholly indicated with reference numeral 4.
Figure 2 illustrates, as a non-limiting example, an embodiment of a rotor 3. The rotor 3 comprises a plurality of circular elements 5 that are adjacent to one another and one after the other so as to make a substantially cylindrical element.
In order to make figure 2 more intelligible, the circular elements 5 making up the rotor 3 have been represented spaced from one another.
The rotor 3 has a central axis of symmetry 12, around which it is set in rotation during operation of the permanent magnet-assisted synchronous reluctance motor 1.
Each circular element 5 has a central through opening 6, for housing a central shaft that is not illustrated in the figures, and a plurality of shaped seats 7. The number and the arrangement of the shaped seats 7 can vary as a function of the number of poles of the synchronous reluctance motor 1.
The rotor 3 illustrated in figures 1-4 is provided for a synchronous reluctance motor 1 with four poles.
However, further variants of a synchronous reluctance motor 1 are possible comprising a greater number of poles, for example six, eight, ten, twelve poles, etcetera, without for this reason departing from the scope of protection of the present invention.
The seats 7 are separated from one another by conveying portions 8.
Such conveying portions 8 constitute structural elements for each circular element 5. Furthermore, the conveying portions 8 define preferential paths, called "channels", along which the magnetic flux generated by the stator windings 4 is channelled.
The seats 7 allow permanent magnets 9, 10, 1 1 to be positioned, the number and the dimension of which varies as a function of the performance of the synchronous reluctance motor, for example with reference to the number of poles, to the power of the motor, etcetera.
The length of the permanent magnets 9, 10, 1 1 substantially extends for the same longitudinal length of the rotor 3.
The operation principles of a synchronous reluctance motor are given as known and, therefore, shall not be described in further detail in the rest of the description.
Each seat 7 comprises a substantially rectilinear central portion 13, at which the permanent magnets 9 are positioned.
With reference to the embodiment illustrated in figure 3, inside the seats 7, at the central portion 13, there are rare earth permanent magnets 10.
Figure 4 illustrates a further version of the present invention, in which inside the seats 7, at the central portion 13, the permanent magnets 1 1 in ferrite are positioned.
With reference to the cross-section views illustrated in figures 1 , 3 and 4, the permanent magnets 9, 10, 1 1 are positioned, in groups, which are aligned along the axes defining the poles of the permanent magnet-assisted synchronous reluctance motor 1.
As it is known, in order to ensure a correct mechanical and magnetic balancing of the rotor 3, the permanent magnets 9, 10, 1 1 are arranged in a symmetrical manner inside the rotor 3.
As an example, but not for limiting purposes, each permanent magnet 9, 10, 1 1 is substantially prism-shaped.
Along the cross-section plane, as illustrated in figures 1 , 3 and 4, each permanent magnet 9, 10, 1 1 has a long side 14 and a short side 15. Preferably, the central portion 13 of each seat 7 has an elongated portion in the circumferential direction.
Each permanent magnet 9, 10, 1 1 is positioned inside a corresponding seat 7, with the long side 14 oriented parallel to the central portion 13.
For the same magnetic power, a magnet in ferrite has greater dimensions with respect to a rare earth magnet of the type Neodymium-Ferrite-Boron ( dFeB).
Generally, about double the amount of ferrite is required by weight in order to obtain a permanent magnet with magnetic power that is equal to that of a magnet in Neodymium-Ferrite-Boron.
Although it has a greater amount in weight of ferrite, nevertheless, the low cost of the latter with respect to the rare earths NdFeB makes its use advantageous.
Indeed, on average, the cost per kilogram of a magnet in ferrite is lower by more than one order of magnitude with respect to that of a magnet in NdFeB. The rotor 3 according to the present invention has seats 7 such as to be able to independently house permanent magnets 10 in NdFeB or permanent magnets in ferrite 1 1 with equal magnetic power.
The single central portions 13, indeed, make it possible, instead of rare earth permanent magnets NdFeB 10, to position permanent magnets in ferrite 1 1 which, as indicated above, have for the same power greater dimensions.
As an example, a permanent magnet 1 1 in ferrite to be installed in one of the seats 7 is longer than a permanent magnet in NdFeB 10.
The conformation of the single seats 7, however, makes it possible to choose which type of permanent magnet to use, without any limitation.
In such a way, it is not necessary to make different rotors 3 according to the type of material used for the permanent magnets 9, 10, 1 1.
Indeed, the structure and the performance of a permanent magnet-assisted synchronous reluctance motor 1 according to the present invention can be easily modified based upon the foreseen use, without needing to modify the overall structure of the entire motor. Indeed, it is sufficient to modify the type of permanent magnets 9, 10, 1 1 used.
Furthermore, in order to optimise production costs of a permanent magnet- assisted synchronous reluctance motor 1 according to the present invention, it has been verified that for phase difference values between the current and the voltage equal to cos(p comprised between 0.75 and 0.82, high efficiency of the motor itself is obtained for uses with partial load.
In particular it has been verified that for values of coscp=0.8 an ideal compromise is reached between production costs and efficiency of the permanent magnet-assisted synchronous reluctance motor 1.
Indeed, for partial load uses, a permanent magnet-assisted 9, 10, 1 1 synchronous reluctance motor 1 has an efficiency that is increased by around 20% with respect to a motor of the PM brushless (Permanent Magnet brushless) type of equal power.
Figure 5 illustrates, as an example but not for limiting purposes, a comparison graph between a curve of efficiency of a motor of the PM brushless type, of the power of around 7.5 kW, shown with a continuous solid line 16, and that of a permanent magnet-assisted reluctance motor 1 of equivalent power, according to the present invention, shown with a broken discontinuous line 17.
In the aforementioned graph (figure 5), on the x-axis there is the number of revs of the motor whereas on the y-axis there is the efficiency in percentage. The aforementioned efficiency curves 16, 17 refer to the operation of a PM brushless motor and to a permanent magnet-assisted reluctance motor 1 according to the present invention with a typical resistant load of a pump applied.
As illustrated in the aforementioned graph, for loads of the partial type, i.e. with a number of motor revs that is limited with respect to the maximum rotation (full speed), the curve 17 of the permanent magnet-assisted reluctance motor 1 according to the present invention is greater than the curve 16 of a PM brushless motor.
This is due to the fact that in PM brushless motors the parasitic losses substantially remain unaltered both in conditions of partial load and of full load.
In a permanent magnet-assisted synchronous reluctance motor 1 according to the present invention, on the other hand, for loads of the partial type the losses induced by the stator currents are lower with respect to the parasitic currents of PM brushless motors.
Therefore, the efficiency of a permanent magnet-assisted reluctance motor 1 according to the present invention, for partial loads, is greater than that of a PM brushless motor of corresponding power.
For loads at full speed, on the other hand, the permanent magnet-assisted reluctance motor 1 according to the present invention and a PM brushless motor substantially have the same efficiency.
Indeed, if it is foreseen for there to be a synchronous motor for applications with partial load, the selection of a permanent magnet-assisted reluctance motor 1 according to the present invention is advantageous with respect to a PM brushless motor, in terms of efficiency and, consequently, of operation costs.
In order to optimise the efficiency of a permanent magnet-assisted synchronous reluctance motor 1 with particular reference to uses with partial load, it is necessary to install inside the rotor 3 the amount of permanent magnets 9, 10, 1 1 that is sufficient in order to ensure the aforementioned phase difference value, with cos<p=0.8.
It has indeed been noted, that for slight increases in such a phase difference value, even when there is a small increase in the efficiency, there is however a high increase in the production costs, since it is required for there to be a greater amount of permanent magnets 9, 10, 1 1.
As an example, in order to increase the value of cos<p=0.8 to a value of cos<p=0.85 it is necessary to use almost double the volume of permanent magnets 9, 10, 1 1.
The drawback, in economic terms, coming from such a large increase of materials exceeds the technical advantages of such a solution, making it, in fact, poorly effective in economic terms.
The invention thus conceived can undergo numerous modifications and variants all covered by the inventive concept.
Moreover, all the details can be replaced with other technically equivalent elements. In practice, the materials used, as well as the contingent shapes and sizes, can be any according to the requirements without for this reason departing from the scope of protection of the following claims.

Claims

1. A permanent magnet-assisted synchronous reluctance motor (1 ) comprising a stator (2) equipped with stator windings (4), said stator (2) defining a central seat wherein a substantially cylindrical rotor (3) is positioned comprising a plurality of circular elements (5) adjacent to one another one after the other, each of said circular elements (5) being equipped with a central axis of symmetry (12), said rotor (3) being associated rotatable with respect to said stator (2) around said central axis of symmetry (12), said rotor (3) comprising seats (7), separated from one another by portions (8) for conveying a magnetic flux, characterised in that said rotor (3) comprises, in said seats (7), permanent magnets (9, 10, 1 1 ) in a number such as to determine a value of coscp of the phase difference between current and voltage for said permanent magnet-assisted synchronous reluctance motor (1) comprised between 0.75 and 0.82.
2. A permanent magnet-assisted synchronous reluctance motor (1) according to claim 1 , wherein said phase difference value between current and voltage is preferably equal to cos(p=0.8.
3. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 or 2, wherein said permanent magnets (10) are made in Neodymium-Iron-Boron, NdFeB.
4. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 or 2, wherein said permanent magnets (1 1) are made in ferrite.
5. A permanent magnet-assisted synchronous reluctance motor (1) according to claim 1 , comprising a number of poles greater than or equal to 4.
6. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 , wherein said conveying portions (8) are shaped so as to guide flux lines of a magnetic field generated by said stator winding (4) through said rotor (3).
7. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 , wherein said seats (7) comprise a central portion (13) in which permanent magnets (9, 10, 1 1) in ferrite or in NdFeB are positioned.
8. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 , wherein said permanent magnets (9, 10, 1 1) are substantially prism-shaped, with a length that is substantially equal to the longitudinal length of said rotor (3).
9. A permanent magnet-assisted synchronous reluctance motor (1) according to claim 7, wherein said permanent magnets (9, 10, 1 1) have, along a cross-section plane, one long side (14) and one short side (15), wherein said permanent magnets (9, 10, 1 1) are inserted in said shaped seats (7) with said long side (14) directed parallel to said central section (13).
10. A permanent magnet-assisted synchronous reluctance motor (1 ) according to claim 1 , wherein said permanent magnet-assisted synchronous reluctance motor (1 ) is installed in pumps or fans or machines suitable for mainly operating with partial loads.
EP14830671.5A 2013-12-19 2014-12-16 Optimized synchronous reluctance motor assisted by permanent magnets Withdrawn EP3084937A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000056U ITVR20130056U1 (en) 2013-12-19 2013-12-19 SYNCHRONOUS MOTOR WITH RETURN OPTIMIZATION ASSISTED BY PERMANENT MAGNETS.
PCT/IB2014/066955 WO2015092672A2 (en) 2013-12-19 2014-12-16 Optimized synchronous reluctance motor assisted by permanent magnets

Publications (1)

Publication Number Publication Date
EP3084937A2 true EP3084937A2 (en) 2016-10-26

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ITUA20161727A1 (en) * 2016-03-16 2017-09-16 D&M Holding S P A SYNCHRONOUS RELUCTIVE ELECTRIC GENERATOR
IT201700100814A1 (en) * 2017-09-08 2019-03-08 S M E S P A Procedure for the assembly of a rotor of a synchronous motor with variable reluctance and this rotor
JP6879140B2 (en) * 2017-09-15 2021-06-02 トヨタ自動車株式会社 Rotating machine
CN108023454A (en) * 2018-01-26 2018-05-11 湖北工业大学 A kind of New-type asynchronous starts ferrite permanent-magnet assist type reluctance-synchronous machine
CN110231133B (en) * 2019-06-26 2020-11-24 北京航空航天大学 Method for measuring current rigidity and displacement rigidity of magnetic suspension bearing
CN112234727B (en) * 2020-09-30 2021-07-23 东南大学 Efficiency optimization control method for variable permanent magnet flux linkage synchronous reluctance motor system
CN114123581B (en) * 2021-11-16 2023-06-06 珠海格力电器股份有限公司 Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor

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Title
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WO2015092672A2 (en) 2015-06-25
ITVR20130056U1 (en) 2015-06-20

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