WO2022045985A1 - Rotor with permanent magnets as part of electronically commutated electric motor - Google Patents
Rotor with permanent magnets as part of electronically commutated electric motor Download PDFInfo
- Publication number
- WO2022045985A1 WO2022045985A1 PCT/SI2021/050014 SI2021050014W WO2022045985A1 WO 2022045985 A1 WO2022045985 A1 WO 2022045985A1 SI 2021050014 W SI2021050014 W SI 2021050014W WO 2022045985 A1 WO2022045985 A1 WO 2022045985A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- core
- protrusion
- magnet
- magnets
- Prior art date
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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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/08—Insulating casings
Definitions
- the subject of the invention is a rotor with permanent magnets as part of an electronically commutated electric motor, such as a water or oil pump electric motor, the rotor of which has permanent magnets circularly arranged at a distance from its main axis and is positioned inside the stator of the same electric motor.
- an electronically commutated electric motor such as a water or oil pump electric motor
- the technical problem solved by the invention is the arrangement and fastening of permanent magnets on the rotor in a way that will ensure continuous fixed attachment of magnets to the rotor regardless of the rotor speed, especially at high speeds, wherein the dimensions and weight of the rotor will not increase compared to the hitherto known rotors at a certain number of revolutions and the solution will also be simple and economical to produce.
- the magnets and rotor laminations must be airtightly insulated from the environment and the surrounding medium.
- Clamping elements must be made of non-magnetic materials, such as stainless steel or reinforcing fibres, so as not to affect the magnetic flux between the rotor and the stator, and at the same time have sufficient strength to ensure a fixed attachment.
- coaxial arc magnets are used, which exhibit a high self-sustaining torque, which results in uneven motor operation at elevated noise levels.
- rotors Due to the above reasons, i.e. motor efficiency and cost-effective manufacturing, rotors exist, in which the magnets are not glued to the rotor core. The magnets are inserted into the slots in the laminations adapted for this purpose or in the rotor core.
- the metal laminations which are mounted in stacks on the rotor axle have low protrusions in the radial outward direction, which limit the slots, into which the magnets are inserted. Since the laminations are of metal, it is desirable to keep the protrusions as low as possible, as this prevents excessive reduction in the magnetic field.
- the low protrusions position the magnets evenly distributed around the circumference of the core, but on the other hand they do not prevent the magnets from moving in the radial direction at high rotor speeds.
- the magnets are attached to the rotor core by a plastic mass - a thermoplastic sheath which is injected onto the rotor by means of 2-component injection technology, which allows the rotor core and magnets to be airtightly separated from the surrounding medium.
- the magnets are preattached to the rotor core by means of special thermoplastic grids.
- the plastic grids do not have a load-bearing function for magnets but only hold the magnets in the desired position during the plastic injection process.
- the centrifugal force resulting from the rotation of the rotor is so great that the attachment of the magnet with the thermoplastic sheath alone is not sufficient at all.
- Thermoplastic grids for attaching magnets during injection moulding do not have a load-bearing function and further weaken the load-bearing capacity of the sheath, as they critically thin the wall of the sheath in certain places and thus reduce the load-bearing capacity.
- a disadvantage of this solution is that at high rotational speeds and at higher temperatures, the loadbearing capacity of the plastic, i.e. the sheath, is reduced to such an extent that the magnets can shift in the radial direction.
- WO 2013/104998 discloses a permanent-magnet rotor including a shaft, a core, a plurality of permanent magnets arranged on the core circumference and surrounded by a reinforcing element, wherein the rotor comprises a core formed as a lamination core with positioning laminations and anchoring laminations, said core having circumferentially arranged longitudinal dovetail shaped grooves.
- the positioning laminations and the anchoring laminations are joined to a lamination stack in a way that longitudinal dovetail shaped grooves are formed circumferentially on the lamination core, the grooves being interrupted at a certain distance by webs of the positioning laminations, and permanent magnets are arranged between the grooves on the circumference of the lamination core and held in place by a reinforcing element shaped like a plastic reinforcing cage.
- a disadvantage of the described solution is numerous design elements contained in the individual elements for positioning purposes, which enable form-joint connections and the use of a reinforcing cage, which means more demanding and, above all, uneconomical fabrication.
- a rotor with permanent magnets as part of an electronically commutated electric motor, which includes a rotor core formed of laminations which are interconnected to a lamination stack in a known way so as to form the so-called lamination core.
- the lamination core has circumferentially arranged equidistant longitudinal grooves of the dovetail type, which are separated by protrusions to form bearings for magnets.
- the laminations have protrusions equidistantly arranged along their outer circumference, in the direction of the radius outwards, each protrusion being made in the form of a pair of positioning tabs separated from each other by a slot so that between one positioning tab of the first protrusion and an adjacent positioning tab of the adjacent protrusion a groove is formed, into which a permanent magnet is inserted.
- the magnets are configured to fit into each groove, namely the magnets have a dovetail shape in the cross-section, so that they form-fit into each groove.
- Figure 1 shows a rotor of the invention in a partial cross-section
- Figure 2 shows a detail of the rotor of the invention from Figure 1
- Figure 3 shows a detail of the rotor with a magnet inserted
- Figure 4 shows a lamination in a cross-section
- Figure 5 shows details A and B of the lamination in a cross-section
- Figure 6 shows a magnet in a cross-section
- the electronically commutated electric motor comprises a stator (not shown) and in its interior a coaxially arranged rotor 1 having a shaft 11 whose axis coincides with the main axis of the motor, a rotor core 2 which is substantially cylindrical in shape and has a central hole for receiving the shaft 11, and a plurality of permanent magnets 3 circumferentially arranged on the core 2.
- the core 2 has circumferentially arranged equidistant longitudinal grooves 21 of the dovetail type, which are separated by protrusions 42, the number of grooves 21 and the number of protrusions 42 being identical to the number of permanent magnets 3 in each case.
- the dimension of the groove 21 and thus the dimension of the protrusion 42 is determined by the dimension of the permanent magnet 3, and are determined in such a way as to ensure a tight fit of the magnet 3 in the groove 21.
- the bottom surface of the groove 21 forms a bearing 22 of the magnet 3 and is adapted to the bottom surface of the magnet 3.
- the core 2 is formed of metal disk-shaped laminations 4 which are interconnected to a lamination stack in a known way so as to form the so-called lamination core 2.
- Each of the laminations 4 has protrusions 42 equidistantly arranged along its outer circumference 41 in the form of two positioning tabs 43, 44 that are separated from each other by a slot 45.
- the slot 45 is formed substantially in the middle of the protrusion 42 in a way to divide the protrusion 42, with respect to the x-axis, into two positioning tabs 43, 44, and is formed, due to the manufacturing process of punching, in a way that in the cross-section in its upper portion, viewed in a radial direction from the outer edge towards the axis of rotation, it is formed first by straight sides 451 to a height equal to the height of the protrusion 42 or the height of an individual positioning tab 43, 44, and then follows the shape of a circular section 452 which continues into the interior of the lamination 4.
- the height of the protrusion 42 must not be higher than the outer radius of the magnet 3. Since the laminations are of metal, it is desirable to keep the protrusions 42 as low as possible, as this prevents excessive reduction in the magnetic field.
- the height of the protrusion 42 is preferably lower than the height of a lateral side 33 of the magnet 3. Most preferably, the height of the protrusion 42 and thus the height of an individual positioning tab 43, 44 is approximately equal to 2/3 of the height of the lateral side 33 of the magnet 3. In the crosssection, the positioning tabs 43, 44 have their outer sides 431, 441, i.e.
- the sides opposite the straight sides 451, formed at an angle a so that the outer sides 441 of the positioning tabs 44 of the first protrusions 42 and the outer sides 431 of the positioning tabs 43 of the adjacent protrusions 42 delimit a dovetail-type groove 21 into which a permanent magnet 3 is inserted.
- the positioning tabs 43, 44 are mirror-symmetrical with respect to the x-axis.
- the angle a is equal to or greater than 70° and equal to or less than 80°.
- the number of protrusions 42 on the circumference of each lamination 4 is equal to the number of magnets 3, and the width of the protrusion 42 depends on the dimension of the magnets 3 or on their required mutual spacing, while the width of the protrusion 42 and the width of the groove 21 ensure a tight fit between the magnet 3 and the positioning tabs 43, 44 when inserting the magnet 3 into the groove 21.
- the first laminations are provided on one or the other side of the core 2, i.e. on the upper or lower portion of the core 2 up to a height of 2 to 3 mm, with protrusions 42 formed with narrower positioning tabs 43, 44, such that the groove 21, into which the magnet 3 is inserted, in the upper or lower portion of the core 2 on its outer side, viewed in a radial direction from the outer edge towards the axis of rotation, is provided with an enlargement 211.
- the width of the enlargement 211 is such as to provide a loose fit between the magnet 3 and the positioning tabs 43, 44, when inserting the magnet 3 into the groove 21.
- the width of the enlargement 211 is between 0.05 and 0.15 mm.
- the protrusions 42 are made in the form of two tabs 43, 44 which are separated from each other by the slot 45, this allows additional elasticity of the tabs 43, 44, which, when inserting the magnet 3 into the groove 21, deviate slightly into the slot 45, thus making it easier to insert the magnet 3 into the groove 21, while at the same time preventing damage to the magnets due to excessive force as a result of the tight fit between the magnets 3 and the tabs 43, 44.
- protrusions 42 are made in the form of two tabs 43, 44 which are separated from each other by the slot 45, this further reduces the influence of the metal from which the laminations 4 are made on the reduction in the magnetic field.
- a permanent magnet 3 is placed in each groove 21, i.e. between the respective longitudinal rows of adjacent protrusions 42.
- the shape of the magnet 3 is adapted to the shape of the groove 21 with a tight fit in the portion where the groove
- an opposite, upper side 32 is lens-shaped with a radius less than the radius of the rotor, and the lateral sides 33 are provided at an angle p less than 90° and equal to or greater than 80°, so that it has a negligible effect on reducing the magnetic field.
- the angle is at least 5° larger than the angle a, at which the outer sides 431, 441 of the positioning tabs 43, 44 are provided, which delimit the groove 21 of the dovetail type.
- the angle p is preferably 85°.
- the magnets 3 are additionally fixed in the grooves 21, and the contact on the side of the magnet 33 is tangent linear. In this way, the possibility of the magnet getting damaged is significantly reduced, as only a thin straight line would be visible on the magnet if it were squeezed out of the rotor stack, as a result of the contact (friction) between the tab and the side of the magnet.
- the rotor 1 is filled on all sides with thermoplastic mass using 2-component injection moulding technology, thus forming a rotor 1 sheath with a thickness of at least 0.6 mm, which also has a sealing function.
- the plastic material also flows into the slot 45, wherein the slots 45 filled with thermoplastic mass act as reinforcing ribs, which additionally support the rotor 1 sheath, while the thermoplastic mass in the slots 45 additionally fixes the positioning tabs 43, 44, thus preventing further elasticity of the positioning tabs 43, 44, which still further secures the magnets 3 in the grooves 21.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The subject of the invention is a rotor (1) with permanent magnets (3) as part of an electronically commutated electric motor, comprising a rotor core (2) formed of laminations (4) and having circumferentially arranged equidistant longitudinal grooves (21) of the dovetail type, which are separated by protrusions (42), permanent magnets (3) inserted in the longitudinal grooves (21) and a sheath. The protrusions (42) are arranged in the direction of the radius outwards, each protrusion (42) being formed in the form of a pair of positioning tabs (43, 44) separated from each other by a slot (45), the positioning tabs (43, 44) having their outer sides (431, 441) arranged in the cross-section at an angle and the lateral sides (33) of the magnet (3) are arranged at an angle. The rotor is filled from all sides by thermoplastic mass, wherein the slots (45) filled with thermoplastic mass act as reinforcing ribs, which additionally support the rotor (1) sheath, while the thermoplastic mass in the slots (45) additionally fixes the positioning tabs (43, 44), which still further secures the magnets (3) in the grooves (21).
Description
Rotor with permanent magnets as part of electronically commutated electric motor
The subject of the invention is a rotor with permanent magnets as part of an electronically commutated electric motor, such as a water or oil pump electric motor, the rotor of which has permanent magnets circularly arranged at a distance from its main axis and is positioned inside the stator of the same electric motor.
The technical problem solved by the invention is the arrangement and fastening of permanent magnets on the rotor in a way that will ensure continuous fixed attachment of magnets to the rotor regardless of the rotor speed, especially at high speeds, wherein the dimensions and weight of the rotor will not increase compared to the hitherto known rotors at a certain number of revolutions and the solution will also be simple and economical to produce. At the same time, the magnets and rotor laminations must be airtightly insulated from the environment and the surrounding medium.
Prior art
In electric motors that use permanent magnets arranged on the rotor to generate torque, a problem is encountered with the installation and, in particular, the attachment of the magnets to a rotor core. This problem is especially evident in rotors that operate at higher speeds, or the rotors that operate in a liquid medium, where the magnets and the rotor core must be sealed and separated from the environment or the medium in which they operate. The most common solution is to glue the magnets to the rotor core and further fix them with various clamping elements such as clamping rings or a clamping sheath on the rotor circumference. To ensure a constant circular cross-section of the rotor along its entire length, the rotor, together with the clamping elements, is usually enclosed by plastic or other similar material. Due to additional elements on the rotor, the gap between the stator and the rotor, more precisely the magnets, increases, thus reducing the magnetic flux and the efficiency of the motor. Clamping elements must be made of non-magnetic materials, such as stainless steel or reinforcing fibres, so as not to affect the magnetic flux between the rotor and the stator, and at the same time have sufficient strength to ensure a fixed attachment. To keep the gap between the rotor magnets and the stator as small as possible, coaxial arc magnets are used, which exhibit a high self-sustaining torque, which results in uneven motor operation at
elevated noise levels.
Due to the above reasons, i.e. motor efficiency and cost-effective manufacturing, rotors exist, in which the magnets are not glued to the rotor core. The magnets are inserted into the slots in the laminations adapted for this purpose or in the rotor core. The metal laminations which are mounted in stacks on the rotor axle have low protrusions in the radial outward direction, which limit the slots, into which the magnets are inserted. Since the laminations are of metal, it is desirable to keep the protrusions as low as possible, as this prevents excessive reduction in the magnetic field. The low protrusions position the magnets evenly distributed around the circumference of the core, but on the other hand they do not prevent the magnets from moving in the radial direction at high rotor speeds. The magnets are attached to the rotor core by a plastic mass - a thermoplastic sheath which is injected onto the rotor by means of 2-component injection technology, which allows the rotor core and magnets to be airtightly separated from the surrounding medium. The magnets are preattached to the rotor core by means of special thermoplastic grids. The plastic grids do not have a load-bearing function for magnets but only hold the magnets in the desired position during the plastic injection process.
In the case of rotors with a higher operating speed, the centrifugal force resulting from the rotation of the rotor is so great that the attachment of the magnet with the thermoplastic sheath alone is not sufficient at all. Thermoplastic grids for attaching magnets during injection moulding do not have a load-bearing function and further weaken the load-bearing capacity of the sheath, as they critically thin the wall of the sheath in certain places and thus reduce the load-bearing capacity. A disadvantage of this solution is that at high rotational speeds and at higher temperatures, the loadbearing capacity of the plastic, i.e. the sheath, is reduced to such an extent that the magnets can shift in the radial direction.
WO 2013/104998 discloses a permanent-magnet rotor including a shaft, a core, a plurality of permanent magnets arranged on the core circumference and surrounded by a reinforcing element, wherein the rotor comprises a core formed as a lamination core with positioning laminations and anchoring laminations, said core having circumferentially arranged longitudinal dovetail shaped
grooves. The positioning laminations and the anchoring laminations are joined to a lamination stack in a way that longitudinal dovetail shaped grooves are formed circumferentially on the lamination core, the grooves being interrupted at a certain distance by webs of the positioning laminations, and permanent magnets are arranged between the grooves on the circumference of the lamination core and held in place by a reinforcing element shaped like a plastic reinforcing cage. A disadvantage of the described solution is numerous design elements contained in the individual elements for positioning purposes, which enable form-joint connections and the use of a reinforcing cage, which means more demanding and, above all, uneconomical fabrication.
Due to the above reasons, i.e. motor efficiency and cost-effective manufacturing, a rotor was conceived, in which the magnets are not glued to the rotor core and at the same time no additional fastening element are needed for fastening.
Said technical problem is solved by a rotor with permanent magnets as part of an electronically commutated electric motor, which includes a rotor core formed of laminations which are interconnected to a lamination stack in a known way so as to form the so-called lamination core. The lamination core has circumferentially arranged equidistant longitudinal grooves of the dovetail type, which are separated by protrusions to form bearings for magnets. The laminations have protrusions equidistantly arranged along their outer circumference, in the direction of the radius outwards, each protrusion being made in the form of a pair of positioning tabs separated from each other by a slot so that between one positioning tab of the first protrusion and an adjacent positioning tab of the adjacent protrusion a groove is formed, into which a permanent magnet is inserted. The magnets are configured to fit into each groove, namely the magnets have a dovetail shape in the cross-section, so that they form-fit into each groove.
The invention will be described in more detail hereinbelow and illustrated on the figures which show:
Figure 1 shows a rotor of the invention in a partial cross-section
Figure 2 shows a detail of the rotor of the invention from Figure 1
Figure 3 shows a detail of the rotor with a magnet inserted
Figure 4 shows a lamination in a cross-section
Figure 5 shows details A and B of the lamination in a cross-section
Figure 6 shows a magnet in a cross-section
The electronically commutated electric motor comprises a stator (not shown) and in its interior a coaxially arranged rotor 1 having a shaft 11 whose axis coincides with the main axis of the motor, a rotor core 2 which is substantially cylindrical in shape and has a central hole for receiving the shaft 11, and a plurality of permanent magnets 3 circumferentially arranged on the core 2.
The core 2 has circumferentially arranged equidistant longitudinal grooves 21 of the dovetail type, which are separated by protrusions 42, the number of grooves 21 and the number of protrusions 42 being identical to the number of permanent magnets 3 in each case. The dimension of the groove 21 and thus the dimension of the protrusion 42 is determined by the dimension of the permanent magnet 3, and are determined in such a way as to ensure a tight fit of the magnet 3 in the groove 21. The bottom surface of the groove 21 forms a bearing 22 of the magnet 3 and is adapted to the bottom surface of the magnet 3. The core 2 is formed of metal disk-shaped laminations 4 which are interconnected to a lamination stack in a known way so as to form the so-called lamination core 2.
Each of the laminations 4 has protrusions 42 equidistantly arranged along its outer circumference 41 in the form of two positioning tabs 43, 44 that are separated from each other by a slot 45. The slot 45 is formed substantially in the middle of the protrusion 42 in a way to divide the protrusion 42, with respect to the x-axis, into two positioning tabs 43, 44, and is formed, due to the manufacturing process of punching, in a way that in the cross-section in its upper portion, viewed in a radial direction from the outer edge towards the axis of rotation, it is formed first by straight sides 451 to a height equal to the height of the protrusion 42 or the height of an individual positioning tab 43, 44, and then follows the shape of a circular section 452 which continues into the interior of the lamination 4. The height of the protrusion 42 must not be higher than the outer radius of the magnet 3. Since the laminations are of metal, it is desirable to keep the protrusions
42 as low as possible, as this prevents excessive reduction in the magnetic field. The height of the protrusion 42 is preferably lower than the height of a lateral side 33 of the magnet 3. Most preferably, the height of the protrusion 42 and thus the height of an individual positioning tab 43, 44 is approximately equal to 2/3 of the height of the lateral side 33 of the magnet 3. In the crosssection, the positioning tabs 43, 44 have their outer sides 431, 441, i.e. the sides opposite the straight sides 451, formed at an angle a, so that the outer sides 441 of the positioning tabs 44 of the first protrusions 42 and the outer sides 431 of the positioning tabs 43 of the adjacent protrusions 42 delimit a dovetail-type groove 21 into which a permanent magnet 3 is inserted. Preferably, the positioning tabs 43, 44 are mirror-symmetrical with respect to the x-axis. In order to ensure sufficient holding force of the magnet 3 in the groove 21, the angle a is equal to or greater than 70° and equal to or less than 80°. The number of protrusions 42 on the circumference of each lamination 4 is equal to the number of magnets 3, and the width of the protrusion 42 depends on the dimension of the magnets 3 or on their required mutual spacing, while the width of the protrusion 42 and the width of the groove 21 ensure a tight fit between the magnet 3 and the positioning tabs 43, 44 when inserting the magnet 3 into the groove 21.
To ensure an easier insertion of the magnets 3 into the grooves 21, the first laminations are provided on one or the other side of the core 2, i.e. on the upper or lower portion of the core 2 up to a height of 2 to 3 mm, with protrusions 42 formed with narrower positioning tabs 43, 44, such that the groove 21, into which the magnet 3 is inserted, in the upper or lower portion of the core 2 on its outer side, viewed in a radial direction from the outer edge towards the axis of rotation, is provided with an enlargement 211. The width of the enlargement 211 is such as to provide a loose fit between the magnet 3 and the positioning tabs 43, 44, when inserting the magnet 3 into the groove 21. Preferably, the width of the enlargement 211 is between 0.05 and 0.15 mm.
Since the protrusions 42 are made in the form of two tabs 43, 44 which are separated from each other by the slot 45, this allows additional elasticity of the tabs 43, 44, which, when inserting the magnet 3 into the groove 21, deviate slightly into the slot 45, thus making it easier to insert the magnet 3 into the groove 21, while at the same time preventing damage to the magnets due to excessive force as a result of the tight fit between the magnets 3 and the tabs 43, 44.
Since the protrusions 42 are made in the form of two tabs 43, 44 which are separated from each
other by the slot 45, this further reduces the influence of the metal from which the laminations 4 are made on the reduction in the magnetic field.
Along the circumference of the lamination core 2, a permanent magnet 3 is placed in each groove 21, i.e. between the respective longitudinal rows of adjacent protrusions 42. The shape of the magnet 3 is adapted to the shape of the groove 21 with a tight fit in the portion where the groove
21 is not provided with the enlargement 211. A lower side 31 of the magnet 3 rests on the bearing
22 on the lamination core 2, an opposite, upper side 32 is lens-shaped with a radius less than the radius of the rotor, and the lateral sides 33 are provided at an angle p less than 90° and equal to or greater than 80°, so that it has a negligible effect on reducing the magnetic field. The angle is at least 5° larger than the angle a, at which the outer sides 431, 441 of the positioning tabs 43, 44 are provided, which delimit the groove 21 of the dovetail type. The angle p is preferably 85°. Because the lateral sides 33 of the magnets 3 are provided at a slightly greater angle than the outer sides 431, 441 of the positioning tabs 43, 44, and due to the above-mentioned elasticity of the tabs 43, 44, which deflect into the interior of the slot 45 when the magnet 3 is inserted into the groove 21, the magnets 3 are additionally fixed in the grooves 21, and the contact on the side of the magnet 33 is tangent linear. In this way, the possibility of the magnet getting damaged is significantly reduced, as only a thin straight line would be visible on the magnet if it were squeezed out of the rotor stack, as a result of the contact (friction) between the tab and the side of the magnet.
After the magnets 3 have been inserted into the grooves 21, the rotor 1 is filled on all sides with thermoplastic mass using 2-component injection moulding technology, thus forming a rotor 1 sheath with a thickness of at least 0.6 mm, which also has a sealing function. The plastic material also flows into the slot 45, wherein the slots 45 filled with thermoplastic mass act as reinforcing ribs, which additionally support the rotor 1 sheath, while the thermoplastic mass in the slots 45 additionally fixes the positioning tabs 43, 44, thus preventing further elasticity of the positioning tabs 43, 44, which still further secures the magnets 3 in the grooves 21.
Claims
1. A rotor with permanent magnets as part of an electronically commutated electric motor, the rotor (1) including a shaft (11) whose axis coincides with the main axis of the motor, a rotor core (2) having circumferentially arranged equidistant longitudinal grooves (21) of the dovetail type, which are separated by protrusions (42), the number of grooves (21) and the number of protrusions (42) being identical to the number of permanent magnets (3) in each case and the dimension of the groove (21) and thus the dimension of the protrusion (42) being defined by the dimension of the permanent magnet (3), and the core (2) is formed of metal disk-shaped laminations (4) which are interconnected to a lamination stack so as to form the core (2), characterized in that the protrusion (42) is provided in the form of two positioning tabs (43, 44) that are separated from each other by a slot (45), the positioning tabs (43, 44) having, in the cross-section, their outer sides (431, 441) provided at an angle (a) that is identical to or larger than 70° and identical to or smaller than 80°, and the lateral sides (33) of the magnet (3) are formed at an angle (P) less than 90° and greater than 80°, and the angle (P) is at least 5° greater than the angle (a).
2. The rotor according to claim 1, characterized in that the slot (45) is formed substantially in the middle of the protrusion (42) in a way to divide the protrusion (42), with respect to the x-axis, into two positioning tabs (43, 44), wherein the slot (45) in the cross-section in its upper portion, viewed in a radial direction from the outer edge towards the axis of rotation, is formed first by straight sides (451) to a height equal to the height of the protrusion (42) and then follows the shape of a circular section (452) which continues into the interior of the lamination (4).
3. The rotor according to claims 1 and 2, characterized in that the height of the protrusion (42) and thus the height of an individual positioning tab (43, 44) is lower than the height of the lateral side (33) of the magnet (3).
4. The rotor according to preceding claims, characterized in that the first laminations (4) are provided on one or the other side of the core (2), i.e. on the upper or lower portion of the core (2) up to a height of 2 to 3 mm, with protrusions (42) formed with narrower positioning tabs (43, 44), such that the groove (21), into which the magnet (3) is inserted, in the upper or lower portion of
8 the core (2) on its outer side, viewed in a radial direction from the outer edge towards the axis of rotation, is provided with an enlargement (211).
5. The rotor according to claim 4, characterized in that the width of the enlargement (211) is between 0.05 and 0.15 mm.
6. The rotor according to preceding claims, characterized in that it further includes a rotor (1) sheath of a thickness of at least 0.6 mm, made by filling the rotor (1) on all sides with a thermoplastic mass, wherein the slots (45) filled with thermoplastic mass act as reinforcing ribs, which additionally support the rotor (1) sheath, while the thermoplastic mass in the slots (45) additionally fixes the positioning tabs (43, 44), which still further secures the magnets (3) in the grooves (21).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SIP-202000152 | 2020-08-31 | ||
| SI202000152A SI26077A (en) | 2020-08-31 | 2020-08-31 | Rotor with permanent magnets as part of an electronically commutated electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022045985A1 true WO2022045985A1 (en) | 2022-03-03 |
Family
ID=78135068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SI2021/050014 WO2022045985A1 (en) | 2020-08-31 | 2021-08-03 | Rotor with permanent magnets as part of electronically commutated electric motor |
Country Status (2)
| Country | Link |
|---|---|
| SI (1) | SI26077A (en) |
| WO (1) | WO2022045985A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022122457A1 (en) | 2022-09-05 | 2024-03-07 | HELLA GmbH & Co. KGaA | Rotor with permanent magnets for electric motors |
| DE102022122434A1 (en) | 2022-09-05 | 2024-03-07 | HELLA GmbH & Co. KGaA | Rotor with permanent magnets for electric motors |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004048970A (en) * | 2002-07-16 | 2004-02-12 | Meidensha Corp | Permanent-magnet rotary-electric machine |
| CN1606211A (en) * | 2003-10-10 | 2005-04-13 | 本田技研工业株式会社 | Permanent magnet type rotor and brushless motor |
| WO2005119879A1 (en) * | 2004-06-02 | 2005-12-15 | Etel Sa | Synchronous motor |
| DE102004061617A1 (en) * | 2004-12-17 | 2006-07-06 | Zf Friedrichshafen Ag | Rotor for permanent magnet excited electrical machine in inner armature design has magnet element which is held on its position exclusively by attachment on retaining surfaces of sheet metal packet |
| CN201008107Y (en) * | 2007-02-14 | 2008-01-16 | 蔡国法 | Rotor for electric machine |
| CN202550724U (en) * | 2012-02-03 | 2012-11-21 | 倪正尧 | High-strength motor rotor body |
| CN102891549A (en) * | 2011-07-20 | 2013-01-23 | 苏州泰铎电气有限公司 | Surface mounted permanent magnet motor as well as internal rotor thereof and punching sheet thereof |
| CN203104162U (en) * | 2013-03-27 | 2013-07-31 | 洛阳北易三轮摩托车有限公司 | Docking-type permanent magnet differential motor |
| CN103501066A (en) * | 2013-09-23 | 2014-01-08 | 徐州天擎机电有限公司 | Motor rotor special for electric tricycle |
| CN102545437B (en) * | 2012-02-03 | 2014-02-19 | 杭州春兰电器有限公司 | High-intensity motor rotor body |
| CN102412645B (en) * | 2011-11-15 | 2014-05-21 | 浦江县合芯电子科技有限公司 | Motor rotor body |
| US20140239748A1 (en) * | 2013-02-27 | 2014-08-28 | Wittenstein Ag | Magnet carrier |
| US20190386531A1 (en) * | 2018-06-14 | 2019-12-19 | Abb Schweiz Ag | Rotor with Surface Mounted Magnets |
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2020
- 2020-08-31 SI SI202000152A patent/SI26077A/en active IP Right Grant
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2021
- 2021-08-03 WO PCT/SI2021/050014 patent/WO2022045985A1/en active Application Filing
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| JP2004048970A (en) * | 2002-07-16 | 2004-02-12 | Meidensha Corp | Permanent-magnet rotary-electric machine |
| CN1606211A (en) * | 2003-10-10 | 2005-04-13 | 本田技研工业株式会社 | Permanent magnet type rotor and brushless motor |
| WO2005119879A1 (en) * | 2004-06-02 | 2005-12-15 | Etel Sa | Synchronous motor |
| DE102004061617A1 (en) * | 2004-12-17 | 2006-07-06 | Zf Friedrichshafen Ag | Rotor for permanent magnet excited electrical machine in inner armature design has magnet element which is held on its position exclusively by attachment on retaining surfaces of sheet metal packet |
| CN201008107Y (en) * | 2007-02-14 | 2008-01-16 | 蔡国法 | Rotor for electric machine |
| CN102891549A (en) * | 2011-07-20 | 2013-01-23 | 苏州泰铎电气有限公司 | Surface mounted permanent magnet motor as well as internal rotor thereof and punching sheet thereof |
| CN102412645B (en) * | 2011-11-15 | 2014-05-21 | 浦江县合芯电子科技有限公司 | Motor rotor body |
| CN202550724U (en) * | 2012-02-03 | 2012-11-21 | 倪正尧 | High-strength motor rotor body |
| CN102545437B (en) * | 2012-02-03 | 2014-02-19 | 杭州春兰电器有限公司 | High-intensity motor rotor body |
| US20140239748A1 (en) * | 2013-02-27 | 2014-08-28 | Wittenstein Ag | Magnet carrier |
| CN203104162U (en) * | 2013-03-27 | 2013-07-31 | 洛阳北易三轮摩托车有限公司 | Docking-type permanent magnet differential motor |
| CN103501066A (en) * | 2013-09-23 | 2014-01-08 | 徐州天擎机电有限公司 | Motor rotor special for electric tricycle |
| US20190386531A1 (en) * | 2018-06-14 | 2019-12-19 | Abb Schweiz Ag | Rotor with Surface Mounted Magnets |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022122457A1 (en) | 2022-09-05 | 2024-03-07 | HELLA GmbH & Co. KGaA | Rotor with permanent magnets for electric motors |
| DE102022122434A1 (en) | 2022-09-05 | 2024-03-07 | HELLA GmbH & Co. KGaA | Rotor with permanent magnets for electric motors |
Also Published As
| Publication number | Publication date |
|---|---|
| SI26077A (en) | 2022-03-31 |
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