# US 2017/0256995 A1 · Stator, motor comprising the same and method for making the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0256995 A1 - Document ID: US20170256995A1 - Status: Published application - Kind: A1 - Application number: 15/452,289 - Filed: 2017-03-07 - Published: 2017-09-07 - Earliest claimed: 2016-03-07 - Assignees: Johnson Electric S.A. - Applicants: Johnson Electric S.A. - Inventors: Kar Wai LAM; Yi LI - Web page: https://patentgrep.com/patent/US20170256995A1 ## CPC - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/207: {with openings in the casing specially adapted for ambient air} - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 7/08: Structural association with bearings - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - H02K 15/022: with salient poles - H02K 2203/12: Machines characterised by the bobbins for supporting the windings - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A motor stator includes a stator core and a number of stator windings. The stator core includes a stator yoke and a plurality of stator tooth wrapped by a bobbin formed with an over-molding process, and further correspondingly wound around by stator windings. The stator teeth are connected to an inner surface of the stator yoke. A motor including the above motor stator and a rotor is also provided. The rotor includes a rotor core and a rotary shaft fixed relative to the rotor core. The rotor core is received in the bobbin and in magnetic coupling with the stator teeth. ## Claims ### Claim 1 A motor stator comprising: a stator core comprising a ring-like stator yoke and a plurality of stator teeth connected to an inner surface of the stator yoke; a bobbin wrapping the stator teeth with an over-molding process, and a plurality of stator windings correspondingly wound around the stator teeth of the stator core via the bobbin. ### Claim 2 (depends on 1) The motor stator of claim 1, wherein the bobbin comprises a cylindrical portion and a plurality of winding blocks, each sleeving on a correspondingly one of the stator teeth, the winding blocks extend from an outer side of the cylindrical portion, each of the stator teeth comprises a tooth body and a pole shoe connected to one end of the tooth body opposite from the stator yoke, each of the stator windings is wound around a corresponding one of the winding blocks. ### Claim 3 (depends on 2) The motor stator of claim 2, wherein each of the pole shoes has a structure asymmetric about a corresponding tooth body, one side of the pole shoe opposite from the corresponding tooth body defines a positioning groove, and the stator is used in a single-phase brushless motor. ### Claim 4 (depends on 2) The motor stator of claim 2, wherein the cylindrical portion and the winding blocks of the bobbin are integrally formed, and the stator teeth are connected into an integrated unit through the bobbin. ### Claim 5 (depends on 2) The motor stator of claim 2, wherein the bobbin further comprises a bottom portion connected to one end of the cylindrical portion, a receiving chamber is formed in a center of the bottom portion, and a bearing is mounted in the receiving chamber. ### Claim 6 (depends on 2) The motor stator of claim 2, wherein the bobbin further comprises a position-limiting plate disposed at one end of each of the winding blocks away from the cylindrical portion, two ends of the position-limiting plate both protrude out of the winding block, and each end of the position-limiting plate, the winding block and the cylindrical portion cooperatively cooperatively bounding a winding slot for a corresponding one of windings. ### Claim 7 (depends on 1) The motor stator of claim 1, wherein each of the stator teeth has a lamination-stacking structure. ### Claim 8 (depends on 1) The motor stator of claim 1, wherein the stator yoke has a lamination-stacking structure. ### Claim 9 (depends on 2) The motor stator of claim 2, wherein an inner surface of the stator yoke defines a plurality of first engaging slots, each of the first engaging slot passes through two opposite ends of stator yoke along an axial direction of the stator yoke, each of the stator teeth includes an engaging projection disposed at one end of the tooth body opposite from the pole shoe, and each of the engaging projections engages in a corresponding one of the first engaging slots. ### Claim 10 (depends on 9) The motor stator of claim 9, wherein the stator further comprises a mounting bracket, an annular groove is defined in a circumferential side of the mounting bracket configured to receiving the stator yoke, one of opposite axial end of the mounting bracket defines a plurality guiding notches in communication with the annular groove, and respectively aligning with the first engaging slot to enable each of the engaging projections passes through one corresponding guiding notch to engage in one corresponding first engaging slot. ### Claim 11 (depends on 10) The motor stator of claim 10, wherein a plurality of receiving slots is defined in a circumferential wall bounding the annular groove, to respectively communicating with the guiding notches, the bobbin further comprises a position-limiting plate disposed at one side of each of the winding blocks away from the cylindrical portion, and each position-limiting plate is received in one corresponding receiving slot. ### Claim 12 (depends on 10) The motor stator of claim 10, wherein the stator further comprises an end cap, the end cap comprises a bottom plate and a sidewall, and the end cap is connected to an end of the mounting bracket, a bearing is mounted to the bottom plate of the end cap. ### Claim 13 (depends on 12) The motor stator of claim 12, wherein the mounting bracket comprises a latching portion, a hook is formed at a distal end of the latching portion, the sidewall of the end cap defines a receiving groove to receive the latching portion and a locking hole in communication with the receiving groove and configured to engage with hook. ### Claim 14 (depends on 12) The motor stator of claim 12, wherein the bottom plate of the end cap defines a plurality of ventilation holes. ### Claim 15 (depends on 12) The motor stator of claim 12, wherein a PCB is mounted in the end cap and fixed to an inner side of the bottom plate of the end cap. ### Claim 16 (depends on 9) The motor stator of claim 9, wherein the stator further comprises a mounting bracket, the mounting bracket comprises an mounting portion wrapping the stator yoke with an over-molding process and a receiving portion is integrally formed with and extending from one of opposite axial ends of the mounting portion, a bearing and a PCB is mounted in the receiving portion. ### Claim 17 (depends on 16) The motor stator of claim 16, wherein an annular groove is defined in a circumferential side of the mounting portion configured to receiving the stator yoke, the other one of the opposite axial ends of the mounting portion of the mounting bracket defines a plurality guiding notches in communication with the annular groove, and respectively aligning with the first engaging slot to enable each of the engaging projections passes through one corresponding guiding notch to engage in one corresponding first engaging slot. ### Claim 18 (depends on 2) The motor stator of claim 2, wherein the stator further includes a plurality of terminals attached to an end of the cylindrical portion, and configured to electrically connecting with corresponding stator windings. ### Claim 19 (depends on 18) The motor stator of claim 18, wherein the end of the cylindrical portion to which the terminals is attached forms a plurality of circumferentially spaced protrusions, each of the terminals are engaged between adjacent protrusions. ### Claim 20 A motor comprising: a motor stator, the motor stator comprising: a stator core comprising a ring-like stator yoke and a plurality of stator teeth the stator teeth connected to an inner surface of the stator yoke; a bobbin wrapping the stator teeth and fowling with an over-molding process; and a plurality of stator windings correspondingly wound around the stator teeth of the stator core via the bobbin; and a rotor, the rotor comprising: a rotor core received in the bobbin and in magnetic coupling with the stator teeth; and a rotary shaft fixed relative to the rotor core. ### Claim 21 (depends on 20) The motor of claim 20, wherein the rotor further comprises an impeller connected with one end of the rotary shaft, and the impeller includes a plate plurality of vanes depending on one side of the plate facing the stator. ### Claim 22 A method for making a stator, comprising: providing a plurality of stator teeth; forming a bobbin warping the stator teeth using an over-molding process; and winding stator windings around the bobbin. ### Claim 23 (depends on 22) The method of claim 22, wherein providing a plurality of stator teeth comprises stacking a plurality of core laminations along an axial direction of the stator. ### Claim 24 (depends on 22) The method of claim 22, wherein forming the bobbin comprises placing the plurality of stator teeth in a same injecting mold and injecting resin into the mold. ### Claim 25 (depends on 22) The method of claim 22, wherein the method further comprises: providing a stator yoke; forming a mounting bracket warping the stator yoke using an over-molding process; and assembling the plurality of stator teeth to the stator yoke. ### Claim 26 (depends on 25) The method of claim 25, wherein providing a stator yoke comprises stacking a plurality of core laminations along an axial direction of the stator. ### Claim 27 (depends on 25) The method of claim 25, wherein assembling the plurality of stator teeth to the stator yoke comprising connecting the stator teeth and the stator yoke with dovetail joints.