Source: https://patents.google.com/patent/US6285109?oq=5787449
Timestamp: 2018-06-18 23:56:40
Document Index: 771521646

Matched Legal Cases: ['art 19', 'art 19', 'art 19', 'art 19', 'art 19', 'art 19', 'arts 19', 'arts 19', 'arts 19']

US6285109B1 - Small motor with improved connecting structure between coil, riser and varistor - Google Patents
Small motor with improved connecting structure between coil, riser and varistor Download PDF
US6285109B1
US6285109B1 US09627325 US62732500A US6285109B1 US 6285109 B1 US6285109 B1 US 6285109B1 US 09627325 US09627325 US 09627325 US 62732500 A US62732500 A US 62732500A US 6285109 B1 US6285109 B1 US 6285109B1
US09627325
Hiromitsu Takei
When winding an armature coil start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, it is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.
This is a continuation of application Ser. No. 09/132,774 filed Aug. 12, 1998, now U.S. Pat. No. 6,153,960 the disclosure of which is incorporated herein by reference.
The electrode print pattern 57 illustrated in FIG. 5 is a circuit pattern conducting so that a pair of two long and short risers formed interposing the rotation center of the armature therebetween becomes the same potential; three circuit patterns for the three pairs of riser are formed in the same shape and electrically independent of each other.
FIG. 1a is a plan view of one embodiment of an armature of a small motor according to the invention and FIG. 1b is a sectional view taken on line B—B in FIG. 1a;
FIG. 3a is an expansion diagram of FIG. 2a to a pattern drawn with a single stroke of a brush to describe the armature coil windings of the small motor according to the invention and FIG. 3b and 3 c are other expansion diagram examples of patterns drawn with a single stroke of a brush;
FIG. 4 shows embodiments of varistors used with the small motor according to the invention; 4 a is a plan view of a varistor formed with electrode parts on an outer peripheral side face and 4 b is a plan view of a varistor formed with electrode parts on one face; and
An embodiment of a small motor according to the invention will be discussed with reference to the accompanying drawings. FIG. 1a is a plan view to show an armature 10 of a small brush DC motor and FIG. 1b is a sectional view taken on line B—B in FIG. 1a. The structure of the small motor containing a brush coming in sliding contact with a commutator 15 for supplying a current and a permanent magnet having four magnetic poles, placed facing salient poles is known and is not shown.
The winding means is schematically shown in FIG. 2a and a wiring diagram thereof is as shown in FIG. 2b. The illustration in FIG. 2a is furthermore expanded as a plane to a pattern drawn with a single stroke of a brush shown in FIG. 3a. For clarification, in FIGS. 3a-3 c, the portion of the first pair of risers and a salient pole coil winding from the winding start and the portion of a pair of risers and a salient pole coil winding at the winding end are indicated by solid lines and the portion of an intermediate pair of risers and an intermediate salient pole coil winding is indicated by the dashed line. Although the lines in FIG. 3 are cut at both ends, A, B, C, and D shown corresponding to the left and right terminals of the lines are concatenated with the corresponding parts (letters) and the winding start S to the winding end E is formed by one continuous line as will be appreciated by those skilled in the art, of course.
Reference numerals P1-P6 indicating the salient poles and R1-R6 indicating the risers in FIG. 3a to 3 c correspond to placement of the salient poles and the risers shown in FIG. 2a. Winding of coil 14 and winding 17 in a similar manner to the pattern drawn with a single stroke of a brush will be discussed with reference to FIG. 2a and FIG. 3a.
In FIG. 2a and FIG. 3a, when winding start S of the winding 17 (solid line) is entwined around the riser R1, the wire is wound via the opposed riser R4 symmetric with the riser R1 with respect to a point of the rotation center of the armature core 11. Next, the wire is wound around the salient pole P1 adjacent to the riser R4 and the opposed salient pole P2 symmetric with the salient pole P1 with respect to a point of the rotation center of the armature core 11 in order. The coil with a first phase (for example U phase) of three phases is continuously wound on the passing way defined by R1-R4-P1-P2 without interruption. The riser R1 is not connected to the electrode part 19 of the varistor 18 and the riser R4 is connected to the electrode part 19 of the varistor 18 to suppress an over-voltage caused in the first phase. Next, the winding 17 exits the left line terminal A, enters the right line terminal A, is entwined around the riser R3, through the opposed riser R6, (dotted line) exits the left line terminal B from the adjacent salient pole P3, enters the right line terminal B, and leads to the opposed salient pole P4. The coil with a second phase (for example, V phase) of the three phases is continuously wound on the passing way defined by R3-R6-P3-P4 without interruption. The riser R3 is not connected to the electrode part 19 of the varistor 18 and the riser R6 is connected to the electrode part 19 of the varistor 18 to suppress an over-voltage caused in the second phase. Next, the winding 17 is passed to the riser R5, (solid line) is entwined around the opposed riser R2, exits the right line terminal C from the adjacent salient pole P5, enters the left line terminal C, is wound around the salient pole P6, and the winding end terminal E is entwined around the riser R4. The coil with a third phase (for example, W phase) of the three phases is continuously wound on the passing way defined by R5-R2-P5-P6 without interruption. The riser R5 is not connected to the electrode part 19 of the varistor 18 and the riser R2 is connected to the electrode part 19 of the varistor 18 to suppress an over-voltage caused in the third phase.
This is represented as a string of the reference numerals (letters) as follows: S-R1-R4-P1-P2-(left A-right A)-R3-R6-P3-(left B-right B)-P4-R5-R2-P5-(right C-left C)-P6-R4-E. FIG. 3b and 3 c show other examples of patterns drawn with a single stroke of a brush. For simplicity, they are described in a similar manner that shown above.
According to any of such patterns, the coil 14 is wound around the salient poles P1-P6 containing connection to the risers R1-R6. That is, for the winding 17, a wire is wound around the salient poles P1-P6, then is entwined around the terminals of the risers R1-R6 from one salient pole to another. FIG. 3b is electrically equivalent to FIG. 3a independently of the connection order because the connection order is changed only in the two pairs of risers (R3 and R6 and R5 and R2) in FIG. 3a and the paired risers are the same potential. FIG. 3c differs from FIG. 3a only in how to route the winding 17; they are the same in the winding order around the salient poles and the risers. The patterns shown in FIGS. 3a-3 c are examples and any other pattern is also sufficiently possible if it is pattern drawn with a single stroke of a brush, needless to say. Although it is best that a single wire is wound from the first phase to the third phase in the workability, if the coil is independently wound on each phase, it is appropriate to apply the ring varistor with three electrode parts to the 4-6 structure motor when the wiring pattern is improved as shown in FIGS. 3(a) to (c).
FIG. 4 shows embodiments of the varistor 18; FIG. 4a shows a varistor 18 a having three equal-sized electrode parts 19 a insulated from each other on the outer peripheral side surface and an inner face 22 a for a fit and 4 b shows a varistor 18 b having three equal-sized flat electrode parts 19 a insulated from each other along the circumference on one face and an inner face 22 b for a fit. The numeral 18 used above in the description denotes the varistor 18 a shown in FIG. 4a.
That is, the varistor 18 a, the electrodes 19 a, and the inner face 22 a in FIG. 4a correspond to the varistor 18, the electrodes 19, and the inner face 22 respectively. The varistor 18 b shown in FIG. 4b can also function as the varistor 18 by soldering the electrode parts 19 b to the risers R2, R4, and R6.
1. A three-phase motor comprising:
an armature having six salient poles radially arranged and a three-phase coil wound around said salient poles;
six risers connected to said three-phase coil;
six commutators being joined to said risers in a one-to-one correspondence;
a ring varistor being connected to some of said risers for suppressing overvoltage;
a brush coming in sliding contact with said commutators for supplying a current; and
a permanent magnet having four magnetic poles, placed facing said salient poles;
wherein said ring varistor is provided with three electrode parts to which alternate three of said six risers are connected, wherein each of same phrase portions of said three-phase coil has windings wound on a pair of said risers, one of said pair of risers being connected to one of said three electrode parts, wherein said pair of risers are arranged symmetrically with respect to a rotation axis of said armature, and
wherein one of said same phase portions is connected to said riser connected to said electrode part, wherein said same phase portion is also wound on a pair of salient poles one of said pair of salient poles being adjacent in a circumferential direction to said riser connected to said electrode part, and wherein said pair of salient poles is arranged symmetrically with respect to said rotation axis.
2. A three-phase motor as claimed in claim 1, wherein each of said same phase portions of said three-phase coil are wound on respective pairs of salient poles which are symmetric with respect to said rotation axis and respective pairs of risers which are symmetric with respect to said rotation axis.
3. A three-phase motor comprising:
wherein said ring varistor has three electrodes which are insulated from each other at one of an outer circumference surface and one of end surfaces.
4. A three-phase motor comprising:
wherein each of said risers has a projecting portion which protrudes outwardly beyond an outer circumference surface of said ring varistor, and said projecting portion is connected to said coil.
US09627325 1997-08-12 2000-07-27 Small motor with improved connecting structure between coil, riser and varistor Active US6285109B1 (en)
JP9-230281 1997-08-12
JP23028197A JP3347984B2 (en) 1997-08-12 1997-08-12 Small motor
US09132774 US6153960A (en) 1997-08-12 1998-08-12 Small motor with a coil having a continuously wound wire
US09627325 US6285109B1 (en) 1997-08-12 2000-07-27 Small motor with improved connecting structure between coil, riser and varistor
US09888447 US6362555B1 (en) 1997-08-12 2001-06-26 Small motor with improved connecting structure between coil, riser and varistor
US09132774 Continuation US6153960A (en) 1997-08-12 1998-08-12 Small motor with a coil having a continuously wound wire
US09888447 Continuation US6362555B1 (en) 1997-08-12 2001-06-26 Small motor with improved connecting structure between coil, riser and varistor
US6285109B1 true US6285109B1 (en) 2001-09-04
ID=16905357
US09132774 Active US6153960A (en) 1997-08-12 1998-08-12 Small motor with a coil having a continuously wound wire
US09627325 Active US6285109B1 (en) 1997-08-12 2000-07-27 Small motor with improved connecting structure between coil, riser and varistor
US (2) US6153960A (en)
JP (1) JP3347984B2 (en)
CN (2) CN1076899C (en)
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US6153960A (en) 2000-11-28 grant
JP3347984B2 (en) 2002-11-20 grant
CN1193481C (en) 2005-03-16 grant
JPH1169747A (en) 1999-03-09 application
CN1215242A (en) 1999-04-28 application
CN1076899C (en) 2001-12-26 grant
US20050012413A1 (en) 2005-01-20 Electric machine with improved contacting feature
US5780951A (en) 1998-07-14 Low-cost bobbin-wound stator construction for small, single-phase AC motors