Turntable motor and related method thereof

Abstract

An electric machine for a turntable, comprising: a stator comprising a plurality of electrically conductive coils, the electrically conductive coils comprising a plurality of coil windings; and a rotor comprising a plurality of permanent magnets, in which: the stator and the rotor are arranged substantially concentrically around a central axis of the electric machine, a central axis of the plurality of coils is arranged substantially radially with respect to the central axis of the electric machine, and there is a gap of at least 3 mm between the rotor and a face of each coil winding close to the rotor.

Description

Technical Field

[0001] Examples of the present disclosure relate to motors for turntables. Some relate to motors for turntables used to transcribe vinyl records. Background Art

[0002] Electric motors are used in a wide variety of applications, and there are a wide variety of factors to consider when designing an electric motor. Generally speaking, however, electric motors are developed with the overall goal of efficiency.

[0003] It would be desirable to provide an electric motor that is enhanced and / or improved over existing designs. Summary of the invention

[0004] According to various but not necessarily all embodiments, there is provided a motor for a turntable, comprising:

[0005] a stator comprising a plurality of conductive coils including a plurality of coil windings; and

[0006] A rotor comprising a plurality of permanent magnets, wherein:

[0007] The stator and the rotor are arranged concentrically around the central axis of the motor.

[0008] The central axes of the plurality of coils are arranged substantially radially relative to the central axis of the motor, and

[0009] There is a gap of at least 3 mm between the rotor and the face of each coil winding adjacent to the rotor.

[0010] In some examples, the stator is radially outward of the rotor.

[0011] In some examples, a gap is located between an upper surface of each permanent magnet and a face of each coil winding proximate to the rotor.

[0012] In some examples, the gap is greater than or equal to 3 mm and less than or equal to 30 mm.

[0013] In some examples, the stator includes a metal ring having a diameter of approximately 375 mm, wherein a plurality of coils are mounted on the metal ring.

[0014] In some examples, the rotor includes a substantially circular support having a diameter of about 280 mm for the plurality of permanent magnets.

[0015] In some examples, the plurality of coils have a substantially rectangular profile.

[0016] In some examples, an electric machine includes a conductive alloy ring disposed between a stator and a rotor.

[0017] In some examples, the rotor is configured to support a conductive alloy ring.

[0018] In some examples, the stator and rotor are mounted on a chassis having a diameter of approximately 380 mm.

[0019] In some examples, the motor is a direct drive motor.

[0020] In some examples, the gap is an air gap.

[0021] According to various, but not necessarily all, embodiments there is provided a turntable comprising a motor as described herein.

[0022] According to various, but not necessarily all, embodiments, there is provided a method comprising: manufacturing an electric machine as described herein.

[0023] According to various, but not necessarily all, embodiments, there is provided a method comprising: using an electric machine as described herein.

[0024] According to various but not necessarily all embodiments, there is provided a method comprising: manufacturing a turntable as described herein.

[0025] According to various but not necessarily all embodiments, there is provided a method comprising: using a turntable as described herein.

[0026] Examples are provided according to various, but not necessarily all, criteria.

[0027] Examples are provided as claimed in the following claims according to various but not necessarily exhaustive examples.

[0028] Furthermore, a description of a function should also be considered as disclosing any means suitable for performing that function.

[0029] Although the above examples and optional features of the present disclosure are described separately, it should be understood that their provision in all possible combinations and arrangements is included in the present disclosure. It should be understood that various examples of the present disclosure may include any or all features described with respect to other examples of the present disclosure, and vice versa. In addition, it should be understood that any one or more or all features, in any combination, may be implemented / included in / executed by devices, methods, and / or computer program instructions, as needed and appropriate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Some examples will now be described with reference to the accompanying drawings, in which:

[0031] Figure 1 An example of the subject matter described herein is shown;

[0032] Figure 2 Another example of the subject matter described herein is shown;

[0033] Figure 3 Another example of the subject matter described herein is shown;

[0034] Figure 4 Another example of the subject matter described herein is shown;

[0035] Figure 5 Another example of the subject matter described herein is shown;

[0036] Figure 6 Another example of the subject matter described herein is shown; and

[0037] Figure 7 Another example of the subject matter described herein is shown.

[0038] The drawings are not necessarily to scale. Certain features and views of the drawings may be shown schematically or exaggerated in scale for clarity and brevity. For example, the dimensions of certain elements in the drawings may be exaggerated relative to other elements for ease of explanation. Similar reference numerals are used in the drawings to indicate similar features. For clarity, not all reference numerals must be shown in all drawings. DETAILED DESCRIPTION

[0039] Examples of the present disclosure relate to an electric machine 10 for a turntable 12 and related methods.

[0040] In an example, the motor 10 is configured for use in a turntable 12, for example, the turntable 12 is configured for transferring vinyl records.

[0041] In an example, the electric machine includes a stator 14 including a plurality of conductive coils 16 including a plurality of coil windings and a rotor 18 including a plurality of permanent magnets 20 .

[0042] In the example, there is a gap 26 of at least 3 mm between the rotor 18 and one or more portions of the stator 14 closest to the rotor 18 , which gap in the example may be considered an air gap.

[0043] In an example, the motor 10 is configured to provide high precision with minimal distortion, noise / vibration, and excellent reliability.

[0044] Figure 1 An example of an electric motor 10 for a turntable 12 is schematically shown.

[0045] and Figure 1 The various features of this can be found in other figures. Figure 1 In the interim, reference will be made to other drawings by way of example.

[0046] Figure 1The motor 10 of the turntable 12 comprises:

[0047] a stator 14 including a plurality of conductive coils 16 including a plurality of coil windings; and

[0048] The rotor 18 includes a plurality of permanent magnets 20, wherein:

[0049] The stator 14 and the rotor 18 are arranged substantially concentrically around a central axis 22 of the electric machine 10 .

[0050] The central axes 24 of the plurality of coils 16 are arranged substantially radially relative to the central axis 22 of the motor 10 , and

[0051] There is a gap 26 of at least 3 mm between the rotor 18 and a face 28 of each coil winding adjacent to the rotor 18 .

[0052] In examples, the stator 14 can include any suitable stator 14. For example, the stator 14 can have any suitable size, shape, and / or form.

[0053] For example, any suitable stator 14 configured to allow a gap 26 of at least 3 mm between the rotor 18 and the face 28 of each coil winding of the conductive coils 16 of the stator 14 may be used.

[0054] In an example, the stator 14 is substantially circular and is centered about / around a central axis 22 of the electric machine 10 .

[0055] In some examples, the stator 14 includes a metal ring 32 having a diameter of about 375 mm, wherein a plurality of coils 16 are mounted on the metal ring 32. For example, see Figure 7 .

[0056] In these examples, the large diameter of the stator 14 provides a high level of precision in the rotating electromagnetic field.

[0057] The plurality of coils 16 may be mounted inside or outside of the metal ring 32 relative to the central axis 22 of the electric machine 10 .

[0058] The metal ring 32 may include any suitable metal ring 32. For example, the metal ring 32 may have any suitable size, shape, and / or form.

[0059] For example, any suitable metal ring 32 configured to allow the conductive coil 16 to be mounted such that the central axis 24 of the coil 16 is substantially radially disposed relative to the central axis 22 of the electric machine 10 may be used.

[0060] The metal ring may include any suitable metal or metals. For example, the metal ring may include steel and / or any material having an iron content similar to steel, etc.

[0061] In the example, the metal ring 32 is formed from a single piece and therefore has no lamination.

[0062] The plurality of conductive coils 16 may include any suitable conductive coils 16. For example, the plurality of conductive coils 16 may have any suitable size, shape, and / or form.

[0063] In an example, each of the plurality of conductive coils 16 is substantially similar and / or identical. For example, each conductive coil 16 may be identical within manufacturing tolerances.

[0064] Coil 16 may include any suitable conductive material formed and / or wound and / or fabricated into any suitable coil configuration.

[0065] For example, each of the plurality of conductive coils 16 can have any suitable profile. In some examples, the plurality of coils 16 have a substantially rectangular profile.

[0066] As an example, refer to Figure 4 .

[0067] Figure 4 A side view of the conductive coil 16 is schematically shown.

[0068] exist Figure 4 In the example of FIG. 1 , the coil 16 has a substantially rectangular outline and a face 28 of the conductive coil 16 is visible. The face 28 of the conductive coil 28 and / or the coil winding may be considered an end and / or an open end of the conductive coil 16 .

[0069] In an example, each of the plurality of conductive coils 16 can have any suitable dimensions. For example, the conductive coil 16 can have a width 44 in the range of 19 mm to 25 mm, and / or a height 42 in the range of 13 mm to 16 mm, and / or a depth 46 in the range of 17 mm to 18 mm.

[0070] exist Figure 4 In the example of FIG. 1 , the width 44 of the coil 16 is approximately 22 mm, the height 42 is approximately 14.5 mm, and the depth 46 is approximately 16.5 mm. Figure 4 In the example of FIG. 1 , the coil 16 has chamfers at the edges.

[0071] Back to Figure 1As discussed above, in examples, each of the plurality of conductive coils 16 can include any suitable number of turns. In some examples, each of the plurality of conductive coils 16 can include a number of turns in the range of 127 to 147 turns. In some examples, at least one of the plurality of conductive coils includes 137 turns.

[0072] In an example, the magnetic field transfer function of this approach provides a low torque ripple design with a diameter exceeding 350 mm.

[0073] Each of the plurality of conductive coils 16 may have any suitable packing factor. In an example, each of the plurality of conductive coils 16 may have a packing factor in the range of 88% to 92%. In some examples, at least one of the plurality of conductive coils 16 may have a packing factor of 90%.

[0074] The packing factor may be considered a measure of how well the material of the conductive coil 16 fills the space.

[0075] In an example, the coil 16 may include 12 windings per layer.

[0076] The plurality of conductive coils 16 may include and / or may be formed from any suitable conductive material. For example, the plurality of conductive coils 16 may include and / or may be formed from any suitable conductive wire.

[0077] In an example, the plurality of conductive coils 16 include and / or are formed of copper wire having a diameter in the range of 0.95 mm to 1.4 mm. In some examples, the plurality of conductive coils 16 include and / or are formed of copper wire having a diameter of 1.28 mm.

[0078] Any suitable number of coils 16 may be used. For example, 21 conductive coils 16 may be used.

[0079] In an example, the central axis 24 of the conductive coil 16 may be considered to be the axis passing through the central portion of the coil about which the turns of the coil extend.

[0080] In an example, the central axis 24 of the coil 16 may be considered to be an axis passing through a central portion of the coil 16 and the center of an open face of the coil 16 .

[0081] As an example, refer to Figure 4 .

[0082] exist Figure 4 In the example of FIG. 1 , the central axis 24 of the coil 16 is located at the center of the coil 16 and extends into / outside the page through the open face 28 of the coil 16 .

[0083] Back to Figure 1 As discussed above, in the example, the central axes 24 of the plurality of coils 16 are arranged substantially radially relative to the central axis 22 of the motor 10 .

[0084] In an example, the central axis 22 of the electric machine 10 may be considered to be the axis about which the rotor 18 and the stator 14 are configured.

[0085] In an example, the central axis 22 of the electric machine 10 may be considered to be the axis about which the rotor 18 is configured to rotate.

[0086] Thus, in the example, the central axes 24 of the plurality of coils 16 are arranged substantially radially relative to the central axis 22 of the electric machine 10 .

[0087] As an example, refer to Figure 3 .

[0088] Figure 3 An example of a stator 14 and a rotor 18 arranged concentrically about a central axis 22 of the electric machine 10 is shown.

[0089] exist Figure 3 In the example of FIG. 1 , the stator 14 includes a plurality of conductive coils 16, such as Figure 4 as described / shown in the examples.

[0090] like Figure 3 As shown in the example of FIG. 1 , the plurality of conductive coils 16 are arranged about a central axis 22 of the electric machine 10 such that a central axis 24 of the plurality of coils 16 is substantially radial relative to the central axis 22 of the electric machine 10 .

[0091] That is, in an example, the plurality of conductive coils 16 are arranged such that the central axis 24 of the conductive coil 16 passes through the central axis 22 of the motor 10 and / or a region close to the central axis 22 of the motor 10 .

[0092] Back to Figure 1 As discussed above, in examples, the rotor 18 may include any suitable rotor 18. For example, the rotor 18 may have any suitable size, shape, and / or form.

[0093] For example, any suitable rotor 18 including a plurality of permanent magnets 20 configured to allow a gap 26 of at least 3 mm between the rotor 18 and a face 28 of each coil winding of the stator 14 proximate the rotor 18 may be used.

[0094] For example, any suitable rotor 18 may be used that is configured to support a plurality of permanent magnets 20 with a gap 26 of at least 3 mm between the permanent magnets 20 and a face 28 of each coil winding proximate to the rotor 18 .

[0095] In the example, the rotor 18 includes a substantially circular support 34 for the plurality of permanent magnets 20 .

[0096] In an example, the substantially circular support 34 can have any suitable size and / or form. For example, the substantially circular support 34 can have any suitable form to support the plurality of permanent magnets 20 on the inner surface and / or outer surface of the substantially circular support 34.

[0097] In some examples, the diameter of the substantially circular support 34 is in the range of 275 mm to 285 mm.

[0098] In some examples, substantially circular support member 34 has a diameter of approximately 280 mm.

[0099] Thus, in the example, the rotor 18 comprises a substantially circular support 34 for the plurality of permanent magnets 20 with a diameter of approximately 280 mm.

[0100] The substantially circular support member 34 may include any suitable material or materials. For example, the substantially circular support member 34 may be formed from mild steel.

[0101] The plurality of permanent magnets 20 may include any suitable permanent magnets 20. For example, at least one of the plurality of permanent magnets 20 may include nickel-plated neodymium grade 45H.

[0102] In an example, at least one of the plurality of permanent magnets 20 may include a magnetic material other than neodymium.

[0103] In an example, at least one of the plurality of permanent magnets 20 may include neodymium of a different specification.

[0104] Each permanent magnet 20 can have any suitable size, shape and / or form. For example, each permanent magnet 30 can have any suitable size, shape and / or form to be supported on and / or by a substantially circular support 34.

[0105] In some examples, the permanent magnet has an arc-shaped profile. For example, the permanent magnet 20 may have an arc-shaped profile with an outer dimension of 290 mm, an inner dimension of 280 mm, and a thickness of 15 mm.

[0106] Any suitable number of permanent magnets 20 may be used.

[0107] In an example, 14 permanent magnets with alternating poles may be used. In some examples, the number of permanent magnets 20 and conductive coils 16 may be coordinated.

[0108] In the example, the permanent magnets 20 are evenly spaced on the substantially circular support 34, and there may be a spacer 41 between each pair of permanent magnets 20. For example, see Figure 3 .

[0109] In an example, the permanent magnet 20 can be mounted on the substantially circular support 34 in any suitable manner using any suitable method. For example, the permanent magnet 20 can be bonded to the substantially circular support 34.

[0110] As an example, refer to Figure 3 Example. Figure 3 In the example of FIG. 1 , the rotor 18 comprises a substantially circular support 34 in the form of a metal ring, wherein a plurality of permanent magnets 20 are located on the support 34 .

[0111] exist Figure 3 In the example shown, fourteen permanent magnets 20 are mounted on the outer surface of a circular support 34 relative to the central axis 22 of the motor 10 .

[0112] That is to say, Figure 3 In the example of FIG. 1 , the plurality of permanent magnets 20 are located on the surface of the circular support 34 that is farthest from the central axis 22 of the motor 10 .

[0113] In addition, Figure 3 In the example of FIG. 4 , a plurality of spacers 41 are located between the permanent magnets 20 to evenly space the permanent magnets 20 around the outer surface of the circular support 34 .

[0114] Back to Figure 1 As discussed above, in the example, the stator 14 and the rotor 18 are substantially concentrically arranged about a central axis 22 of the electric machine 10 .

[0115] Thus, in the example, the center of the stator 14 and the center of the rotor 18 substantially coincide with the central axis 22 of the electric machine 10 .

[0116] Thus, in the example, the stator 14 and the rotor 18 are substantially arranged as concentric circles about a central axis 22 of the electric machine 10 .

[0117] In an example, the stator 14 and the rotor 18 may be arranged concentrically about the central axis 22 of the motor 10 in any suitable manner. For example, in an example, the rotor 18 may be arranged within the stator 14, which means that the rotor 18 is closer to the central axis 22 of the motor 10.

[0118] For example, the rotor 18 may be disposed outside of the stator 14 , meaning that the rotor 18 is further away from the central axis 22 of the electric machine 10 than the stator 14 .

[0119] As an example, refer to Figure 3 .

[0120] exist Figure 3 In the example shown, the rotor 18 and the stator 14 are arranged substantially concentrically about a central axis 22 of the electric machine 10 .

[0121] exist Figure 3 In the example shown, the rotor 18 is arranged within the coils 16 of the stator 14 relative to the central axis 22 of the electric machine 10 , so that the stator 14 is located radially outside the rotor 18 .

[0122] Thus, in the example, the stator 14 is located radially outside the rotor 18 .

[0123] However, in some examples, the rotor 18 may be located outside of the stator 14 , and thus the rotor 18 may be located radially outside of the stator 14 .

[0124] Reference Figure 3 In an example, the circular support 34 of the rotor 18 can have a diameter large enough to position the circular support 34 outside the plurality of coils 16, in which example, the plurality of permanent magnets 20 can be located on an inner surface of the circular support 34 so that the plurality of permanent magnets 20 remain adjacent to the plurality of conductive coils 16 of the stator 14.

[0125] Reference again Figure 1 In some examples, there is a gap 26 of at least 3 mm between the rotor 18 and a face 28 of each coil winding proximate to the rotor 18 .

[0126] In the example, the gap 26 is an air gap.

[0127] In examples, one or more elements may be located between the rotor 18 and the stator 14 , however, in such examples, a gap 26 may still be considered to exist between the rotor 18 and the stator 14 as described herein.

[0128] In some examples, it is believed that there is a gap 26 of at least 3 mm between the rotor 18 and the stator 14 .

[0129] In some examples, it may be considered that there is at least a 3 mm gap between the rotor 18 and the conductive coils 16 of the stator 14 .

[0130] In some examples, it may be considered that there is a gap 26 of at least 3 mm between the rotor 18 and the stator 14 , such that in use, no portion of the rotor 18 is within 3 mm of any portion of the stator 14 .

[0131] In some examples, it may be considered that the rotor 18 is spaced at least 3 mm from the stator 14 .

[0132] In the example, it is believed that there is a gap 26 of at least 3 mm between the rotor 18 and a face 28 of each conductive coil 16 proximate to the rotor 18 .

[0133] In some examples, gap 26 is located between an upper surface 30 of each permanent magnet 20 and a face 28 of each coil winding that is proximate to rotor 18 .

[0134] As an example, refer to Figure 3 .

[0135] As mentioned earlier, in Figure 3 In the example shown, the stator 14 is located radially outside the rotor 18 .

[0136] Therefore, in Figure 3 In the example shown, the face 28 of the coil winding of the conductive coil 16 / the conductive coil 16 that is close to the rotor 18 is the face 28 that is closest to and faces the central axis 22 of the electric machine 10 .

[0137] exist Figure 3 In the example of FIG. 2 , the gap 26 between the face 28 of the conductive coil 16 and the upper surface 30 of the permanent magnet 20 is represented by a double-headed arrow between these elements.

[0138] like Figure 3 As shown in the example, when the rotor 18 rotates, the gap 26 between the upper surface 30 of any one of the plurality of permanent magnets 20 and the proximal end surface 28 of the plurality of conductive coils 16 is maintained greater than a value, which is at least 3 mm in the example.

[0139] Back to Figure 1 In the example of the discussion, in the example, the gap 26 can have any suitable size greater than 3mm. In some examples, the gap 26 is greater than or equal to 3mm and less than or equal to 30mm.

[0140] In some (but not necessarily all) examples, the electric machine 10 includes a conductive alloy ring 38 disposed between the stator 14 and the rotor 18 .

[0141] Any suitable conductive alloy ring 38 having any suitable size and / or form may be used.

[0142] For example, any suitable conductive alloy ring 38 may be used that is configured to counteract any deviation in rotor rotation when disposed between the rotor 18 and the stator 14 by inducing eddy currents within the conductive alloy ring.

[0143] The conductive alloy ring 38 may include any suitable material. For example, the conductive alloy ring 38 may include any suitable copper alloy, any suitable silver alloy, any suitable aluminum alloy, etc.

[0144] In an example, the conductive alloy ring 38 can be considered as a shielding ring and / or an isolation ring. For example, in an example, the conductive alloy ring 38 can be considered as a copper isolation ring and / or a copper shielding ring.

[0145] In some examples, rotor 18 is configured to support a conductive alloy ring 38 .

[0146] The rotor 18 may be configured in any suitable manner to support the conductive alloy ring 38 .

[0147] For example, one or more components of the rotor 18 may include one or more features and / or be configured to support the conductive alloy ring 38. For example, the spacer 41 may include a flange to support and / or position the conductive alloy ring 38.

[0148] As an example, refer to Figure 3 .

[0149] exist Figure 3 In the example shown, the electric machine 10 includes a conductive alloy ring 38 supported by the rotor 18 .

[0150] In the example shown, the conductive alloy ring 38 is a copper alloy ring that is supported by spacers 41 of the rotor 18 to position the copper alloy ring 38 between the rotor 18 and the stator 14 .

[0151] Back to Figure 1 In the example discussed above, the stator 14 and the rotor 18 are mounted on a chassis 40 .

[0152] The chassis 40 may include any suitable chassis 40. For example, the chassis 40 may have any suitable shape, size, and / or form.

[0153] For example, any suitable chassis 40 configured to mount the rotor 18 and stator 14 such that a gap 26 of at least 3 mm exists between the rotor 18 and a face 28 of each coil winding proximate the rotor 18 , may be used.

[0154] In some examples, chassis 40 has a diameter of at least 380 mm.

[0155] In the example, the diameter of the chassis 40 is approximately 380 mm. Therefore, in the example, the stator 14 and the rotor 18 are mounted on the chassis 40 having a diameter of approximately 380 mm.

[0156] Chassis 40 may include any suitable material or materials. For example, chassis 40 may include any suitable material or materials to prevent and / or limit thermal expansion of chassis 40 / system during use of motor 10 (eg, within rotor disc 12).

[0157] In an example, the chassis 40 may include aluminum, for example, the chassis 40 may be machined from a solid billet of aluminum to a specified tolerance (eg, 0.01 mm) to allow for high positional accuracy of components mounted to the chassis 40 .

[0158] Motor 10 can be any suitable type of motor. In some examples, motor 10 is a direct drive motor. For example, see Figure 5-Figure 7 .

[0159] In the example, Figure 1 The motor 10 may include any number of additional components. In some examples, the Figure 1 One or more components of an example electric machine 10 .

[0160] Figure 2 An example of a turntable 12 is schematically shown.

[0161] exist Figure 2 In the example of Figure 1 The motor 10 is described as an example. Therefore, Figure 2 A turntable 12 is shown including an electric machine 10 as described herein.

[0162] In the example, Figure 2 The turntable 12 may include any number of additional components.

[0163] Figure 5 A perspective view of an example of a turntable 12 is shown.

[0164] exist Figure 5 In the example of FIG. 1 , the turntable 12 includes the motor 10 as described herein.

[0165] exist Figure 5 In the example shown, the electric machine 10 is located within a substantially circular chassis 40 and some of the plurality of conductive coils 16 of the stator 14 are visible.

[0166] The turntable 12 includes a disk 50 that is configured to be driven by the motor 10 to rotate the disk as part of the function of the turntable 12. Figure 5 In the example shown, the disc 50 includes a plurality of disc weights 52 .

[0167] Figure 5 Also shown in the example of FIG. 4 is a main shaft 48 coinciding with the central axis 22 of the motor 10 and the turntable 12 .

[0168] exist Figure 5 In the example of FIG. 1 , the turntable 12 further includes an outer ring 54. The outer ring 54 may include any suitable material or materials. For example, the outer ring 54 may include steel.

[0169] exist Figure 5In the example of FIG. 5 , the outer ring 54 is configured to focus the magnetic field generated by the stator coil 16 .

[0170] Figure 6 Shows Figure 5 1 is a side view of the turntable 12 shown in the example of FIG.

[0171] exist Figure 6 In the example of FIG. 1 , the central axis 22 of the motor 10 / turntable 12 can be seen. The central axis 22 is indicated by arrow AA and is Figure 7 A cross section taken through AA is shown in the example of FIG.

[0172] like Figure 7 As shown in the example of FIG. 1 , the rotor 18 includes a circular support 34 on which a plurality of permanent magnets 20 are mounted.

[0173] In addition, Figure 7 In the example of FIG. 1 , the stator 14 includes a plurality of conductive coils 16 mounted on a metal ring 32 .

[0174] exist Figure 7 In the example of , the rotor 18 and the stator 14 are mounted on a chassis 40 , and the rotor 18 is configured to rotate a disk 50 .

[0175] exist Figure 7 Also shown in the example of FIG. 2 is a center axis 22 of the motor 10 / rotating disc 12 .

[0176] Examples of the present disclosure are advantageous and / or provide technical benefits.

[0177] For example, examples of the present disclosure provide a motor for a turntable that can operate the turntable with low / minimal torque ripple and cogging torque.

[0178] For example, examples of the present disclosure provide a motor configured to produce high precision in rotational speed.

[0179] For example, examples of the present disclosure provide a low noise motor configured to operate at a low speed.

[0180] For example, examples of the present disclosure provide a turntable that is configured such that any resistance caused by stylus interaction has no effect on the speed of the system.

[0181] In some examples, a method of manufacturing an electric machine as described herein is provided.

[0182] In some examples, a method of using an electric machine 10 as described herein is provided.

[0183] In some examples, a method of manufacturing a turntable 12 as described herein is provided.

[0184] Where a structural feature is described, it may be replaced by a means for performing one or more of the functions of the structural feature, whether the function or functions are described explicitly or implicitly.

[0185] The word "include" is used in this document in an inclusive rather than exclusive sense. That is, any reference to X including Y indicates that X may include only one Y or may include more than one Y. If the exclusive meaning of "include" is intended, it will be made clear in the context by referring to "include only one..." or using "consisting of".

[0186] In this description, "connected", "coupled" and "in communication" and their derivatives refer to being operationally connected / coupled / in communication. It should be understood that any number or combination of intermediate components (including no intermediate components) may be present, i.e., to provide direct or indirect connection / coupling / in communication. Any such intermediate components may include hardware and / or software components.

[0187] As used herein, the term "determine / determining" (and grammatical variations thereof) may include, among others: calculating, computing, processing, deriving, measuring, investigating, identifying, searching (e.g., searching in a table, database, or other data structure), ascertaining, etc. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), acquiring, etc. Furthermore, "determine / determining" may include solving, selecting, choosing, establishing, etc.

[0188] In this specification, reference has been made to various examples. The description of features or functions associated with an example indicates that these features or functions are present in the example. The use of the term "example" or "for example" or "can" or "may" in the text indicates that, whether explicitly stated or not, these features or functions are at least present in the described example, whether described as an example or not, and they may but not necessarily be present in some or all other examples. Therefore, "example", "for example", "can" or "may" refers to a specific instance in a class of examples. The attributes of an instance may be attributes of only the instance, or attributes of the class or attributes of a subclass of the class, and the subclass includes some but not all instances in the class. Therefore, it is implicitly disclosed that the features described with reference to one example rather than with reference to another example can be used as part of a working combination in the other example where possible, but not necessarily in the other example.

[0189] Although the examples have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the claims.

[0190] Features described in the preceding description may be used in combinations other than the combinations explicitly described above.

[0191] Although functions have been described with reference to certain features, those functions may be performable by other features whether described or not.

[0192] Although features have been described with reference to certain examples, those features may also be present in other examples whether described or not.

[0193] The terms "a", "an" or "the" are used in this document in an inclusive and non-exclusive sense. That is, any reference to X that includes one / an / the Y means that X may include only one Y or multiple Ys, unless the context clearly indicates otherwise. If the exclusive meaning of "a", "an" or "the" is intended, it will be clearly stated in the context. In some cases, the use of "at least one" or "one or more" may be used to emphasize the inclusive meaning, but the absence of these terms should not be regarded as inferring any exclusive meaning.

[0194] The presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself, and also to features that achieve substantially the same technical effect (equivalent features). Equivalent features include, for example, features that are variants and achieve substantially the same result in substantially the same way. Equivalent features include, for example, features that perform substantially the same function in substantially the same way to achieve substantially the same result.

[0195] In this specification, reference has been made to various examples where adjectives or adjective phrases are used to describe features of the examples. Such description of features associated with the examples indicates that the features are identical to those described in some examples and substantially identical to those described in other examples.

[0196] The above description describes some examples of the present disclosure, however, those skilled in the art will be aware of possible alternative structures and method features that provide equivalent functions to the specific examples of the above structures and features, and have been omitted from the above description for the sake of brevity and clarity. Nevertheless, the above description should be understood to implicitly include references to such alternative structures and method features that provide equivalent functions, unless such alternative structures or method features are explicitly excluded in the above description of examples of the present disclosure.

[0197] Although the applicant has tried hard to emphasize the technical features that he considers important in the foregoing description, it should be understood that the applicant may seek protection for any patentable feature or combination of features mentioned above and / or shown in the drawings through the claims, regardless of whether they are emphasized or not.

Claims

1. A motor for a turntable, comprising: a stator, the stator comprising a plurality of conductive coils, the conductive coils comprising a plurality of coil windings; as well as A rotor comprising a plurality of permanent magnets, wherein: The stator and the rotor are arranged substantially concentrically around a central axis of the motor, The central axes of the plurality of coils are arranged substantially radially relative to the central axis of the motor, and There is a gap of at least 3 mm between the rotor and the face of each coil winding adjacent to the rotor.

2. The motor according to claim 1, wherein: The stator is located radially outside the rotor.

3. The motor according to claim 1 or 2, wherein: The gap is located between the upper surface of each permanent magnet and the face of each coil winding close to the rotor.

4. An electric machine according to any preceding claim, wherein: The gap is greater than or equal to 3 mm and less than or equal to 30 mm.

5. An electric machine according to any preceding claim, wherein: The stator comprises a metal ring having a diameter of about 375 mm, wherein the plurality of coils are mounted on the metal ring.

6. An electric machine according to any preceding claim, wherein: The rotor comprises a substantially circular support for the plurality of permanent magnets having a diameter of approximately 280 mm.

7. An electric machine according to any preceding claim, wherein: The plurality of coils have a substantially rectangular outline.

8. An electric machine according to any preceding claim, comprising a ring of electrically conductive alloy disposed between the stator and the rotor.

9. The electric machine according to claim 8, wherein: The rotor is configured to support the conductive alloy ring.

10. An electric machine according to any preceding claim, wherein The stator and the rotor are mounted on a chassis having a diameter of approximately 380 mm.

11. An electric machine according to any preceding claim, wherein: The motor is a direct drive motor.

12. An electric machine according to any preceding claim, wherein: The gap is an air gap.

13. A turntable comprising a motor according to at least one of claims 1 to 12.

14. A method comprising: An electric machine as claimed in at least one of claims 1 to 12 is produced.

15. A method comprising: An electric machine as claimed in at least one of claims 1 to 12 is used.

16. A method comprising: Produce a turntable as claimed in claim 13.

17. A method comprising: Use of the turntable as claimed in claim 13.

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