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  Slack-forming mechanism for stator coilUSPTO Application #: 20060238044Title: Slack-forming mechanism for stator coil Abstract: A slack-forming mechanism for stator coils that is able to impart slack of appropriate size to the stator coil without imposing an excessively heavy burden on the coiling machine. The slack-forming mechanism includes a coiling machine attachment jig having a protruding member that passes through a clearance formed between a stator body and connector, and has a top edge positioned higher than a clearance pass-through part of a stator coil. As it is possible to form slack in the stator coil without changing the configuration of the coiling machine, deficiencies in prior art slack-forming mechanisms are overcome such as the difficulty of maintaining uniform slack amounts, and unreliability. Moreover, since design-related restrictions are few, an adequately large slack is imparted to the stator coil to adequately suppress breakage of the stator coil induced by temperature change. (end of abstract) Agent: Schulte Roth & Zabel LLP Attn: Joel E. Lutzker - New York, NY, US Inventors: Taiichi Miya, Naohiko Aoyama USPTO Applicaton #: 20060238044 - Class: 310071000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060238044. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of and claims all rights of priority to U.S. patent application Ser. No. 10/607,594, which, in turn, claims priority from Japanese Patent Application No. 2002-190204 filed on Jun. 28, 2002. FIELD OF THE INVENTION [0002] This invention relates to a slack-forming mechanism for the stator coils of electric rotating machines such as resolvers and motors. BACKGROUND OF THE INVENTION [0003] A VR resolver (variable reluctance resolver) which is one example of a rotating machine, is shown in FIG. 4. In FIG. 4, the VR resolver 1 is roughly configured by providing a plurality of magnetic teeth 4 on the inside of the annular stator stack 3 of the stator 2, winding a stator coil 5 onto the plurality of magnetic teeth 4, and providing a rotor (not illustrated in the drawing) inside the stator 2. The stator stack 3 consists of a core part (not illustrated in the drawing) and an insulator 6 (insulation) that is provided to cover the core part. The stator 2 consists of the stator stack 3, stator coil 5, and a resin connector 10 that is provided with two attachment pins 8, 9 that are enwrapped by the terminal part 7 of the stator coil 5 and connect to outside wiring (not illustrated in the drawing). The connector 10 is integrally formed with the insulator 6 of the stator stack 3. [0004] In the slack-forming mechanism shown in FIG. 4, a circular rod 11 that is provided in the coiling machine (not illustrated in the drawing) is disposed on the connector 10 between the magnetic teeth 4 and the attachment pins 8, 9. The stator coil 5 contacts the circular rod 11 and crosses over it, and the terminal part 7 of the stator coil 5 wraps around the attachment pins 8, 9. Because the stator coil 5 contacts the circular rod 11 and crosses over it, a slack is imparted (formed) in the stator coil 5, and breakage of the stator coil 5 due to temperature change is impeded. [0005] Another example of a mechanism that forms slack 12 in the stator coil 5 (a slack-forming mechanism for stator coils) is shown in FIG. 5. This slack-forming mechanism for stator coils is provided in a VR resolver configured similarly to the VR resolver shown in FIG. 4. In FIG. 5, in the vicinity of the connector 10, two resin pins (by-pass pins 15) are installed as the slack-forming mechanism for stator coils. In the slack-forming mechanism for stator coils shown in FIG. 5, the terminal parts 7 of the stator coils 5 wrap around the attachment pins 8, 9 in a state where the stator coils 5 pass around the outside of the two by-pass pins 15. [0006] In the slack-forming mechanism for stator coils shown in FIG. 4, as the pertinent slack-forming mechanism is provided in the coiling machine (circular rod 11), it adds to the complexity of the coiling machine, and in this connection it is difficult to guarantee the stable operation of the slack-forming mechanism for stator coils and consequently, it becomes difficult to uniformly control the slack amount, and reliability tends to decline. [0007] With the slack-forming mechanism for stator coils shown in FIG. 5, there are restrictions on the attachment positions and the like of the by-pass pins 15, it is not able to impart an adequate slack 12, and there is the danger that it is not able to adequately inhibit breakage of the stator coils 5 induced by temperature change. SUMMARY OF THE INVENTION [0008] The present invention is made in light of the aforementioned circumstances, and an object of the present invention is to offer a slack-forming mechanism for stator coils that is able to form slack of appropriate size in the coil without imposing an excessively heavy load on the coiling machine. [0009] Accordingly, in a first aspect of the present invention, a slack forming mechanism is provided including a stator attachment jig for receiving and coupling a stator to a coil winding machine and a slack forming member extending from the jig and adapted to extend through an opening between a stator body and a coil wire connector, the slack forming member upwardly deflecting a winding coil to create slack in a coil. [0010] In another aspect of the present invention, a slack-forming mechanism is provided for an annular stator stack possessing a plurality of magnetic teeth on an inside wall, stator coils that wind around the plurality of magnetic teeth and having terminal parts, a connector provided with attachment pins to which the terminal parts of the stator coil are coupled, and two projecting parts that extend substantially in parallel from an outer periphery of the stator stack and that hold the connector arranged between them such that a clearance is formed between the connector and the stator stack, comprising an attachment jig for coupling the stator stack to a coiling machine and including a protruding member extending through the clearance and having a top edge that projects above the clearance, wherein slack is formed in a stator coil by having the stator coil traverse the clearance and contact the protruding member to upwardly deflect the stator coil to form the slack. [0011] In still another aspect of the present invention, a stator device is provided for mounting to a jig attachment for a coil winding device having a slack forming member, comprising a stator body including a plurality of magnetic teeth disposed along an inner periphery of the stator body at least two substantially parallel projecting members extending from an outer periphery of the stator body, and a connector block disposed between the projecting member for receiving terminal ends of stator coils extending from the plurality of magnetic teeth wherein an opening is formed between the connector block and the outer periphery of the stator body such that when the stator body is mounted to a jig attachment, the slack forming member extends through the opening and imparts slack to coil wires traversing the slack forming member and extending between the stator magnetic teeth and the connector block. [0012] Further features and advantages of the invention will become evident to one skilled in the art upon reading of the detailed description of the invention, which is given below by way of example only and with reference to the accompanying drawings, and the scope of the invention will be indicated in the claims. BRIEF DESCRIPTION OF THE DRAWINGS [0013] For a fuller understanding of the invention, reference is made to the following description, taken in connection with the accompanying drawings, in which: [0014] FIG. 1 is a perspective view of an exemplary slack-forming mechanism for stator coils according to an embodiment of the present invention; [0015] FIG. 2 is a partial cross-sectional view showing the slack-forming mechanism for stator coils of FIG. 1 and an attachment jig; [0016] FIG. 3 is a top plan view showing the slack-forming mechanism for stator coils of FIG. 1 excluding stator coil 5; [0017] FIG. 4 is a perspective view showing one example of a conventional slack-forming mechanism for stator coils; and [0018] FIG. 5 is a perspective view showing another example of a conventional slack-forming mechanism for stator coils. DETAILED DESCRIPTION Continue reading... Full patent description for Slack-forming mechanism for stator coil Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Slack-forming mechanism for stator coil patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Slack-forming mechanism for stator coil or other areas of interest. ### Previous Patent Application: Motor Next Patent Application: Stator arrangement of rotary electric machine Industry Class: Electrical generator or motor structure ### FreshPatents.com Support Thank you for viewing the Slack-forming mechanism for stator coil patent info. 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