# US 2018/0323668 A1 · Brushless dc dynamo > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323668 A1 - Document ID: US20180323668A1 - Status: Published application - Kind: A1 - Application number: 15/965,844 - Filed: 2018-04-28 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Inventors: Chun-Jong Chang - Web page: https://patentgrep.com/patent/US20180323668A1 ## CPC - H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) - H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) - H02K 11/30: Structural association with control circuits or drive circuits - H02K 19/16: Synchronous generators - H02K 29/00: Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices - H02K 29/06: with position sensing devices (H02K29/03 takes precedence) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A brushless DC dynamo includes a circular armature with N sets of first armature coils spaced with each other in sequence, N sets of second armature coils spaced with each other in sequence, a plurality of first wires and a plurality of second wires, and each first wire and each second wire respectively interconnecting between one set of the first armature coils and one set of the second armature coils; a control unit; a magnetic unit, disposed inside the circular armature unit, comprising a pair of magnetic poles, wherein the circular armature unit and the magnetic unit can rotate relatively to each other under control; and a position sensor for detecting the position of the magnetic unit, and outputting the information of magnetic unit's position to the control unit to trigger the control unit to output a control signal to control on or off of the first and second control switches. ## Claims ### Claim 1 A brushless DC dynamo, comprising: a circular armature, comprising: N sets of first armature coils spaced with each other in sequence, and the first set of first armature coil is adjacent to the Nth set of first armature coil and joined with each other; N sets of second armature coils spaced with each other in sequence, and the first set of second armature coil is adjacent to the Nth set of second armature coil and joined with each other, wherein the N sets of second armature coils are located outside of the N sets of first armature coils; and a plurality of first wires and a plurality of second wires, and each first wire and each second wire respectively interconnecting between one set of the first armature coils and one set of the second armature coils; wherein, N is a natural number greater than 2, and the (i+1)th set of first armature coil is interconnected to the (i+1)th set of second armature coil by the (i+1)th first wire, and the (i+1)th set of first armature coil is interconnected to the (i+2)th set of second armature coil by the (i+1)th second wire, 1≤(i)≤N−2, and the first set of first armature coil is interconnected to the first set of second armature coil by the 1st first wire, and the first set of first armature coil is interconnected to the second set of second armature coil by the 1st second wire, and the Nth set of first armature coil is interconnected to the Nth set of second armature coil by the Nth first wire, and the Nth set of first armature coil is interconnected to the first set of first armature coil by the Nth second wire; a control unit, comprising N first control switches and N second control switches, wherein the (j)th first control switch is interconnect between a first polarity DC power source and a (j)th second wire, and the (j)th second control switch is interconnected between a second polarity DC power source with a polarity opposite to the first polarity DC power and a (j)th second wire, wherein (j) is a natural number, and 1≤(j)≤N; a magnetic unit, disposed inside the circular armature unit, comprising a pair of magnetic poles, wherein the circular armature unit and the magnetic unit can rotate relatively to each other under control; and a position sensor for detecting the position of the magnetic unit, and outputting the information of magnetic unit's position to the control unit to trigger the control unit to output a control signal to control on or off of the first and second control switches. ### Claim 2 (depends on 1) The brushless DC dynamo as claimed in claim 1, wherein the magnetic unit is a permanent magnet or an electromagnet. ### Claim 3 (depends on 2) The brushless DC dynamo as claimed in claim 2, wherein the position sensor is a resolver, an encoder, a Hall sensor, a photo-interrupter or a photoelectric sensor. ### Claim 4 (depends on 3) The brushless DC dynamo as claimed in claim 3, further comprising a first snubber disposed between the first DC polarity power source and the first control switch, and a second snubber disposed between the second DC polarity power source and the second control switch. ### Claim 5 (depends on 1) The brushless DC dynamo as claimed in claim 1, wherein the first armature coils and the second armature coils are manufactured by wave winding, lap winding or frog-leg winding. ### Claim 6 (depends on 1) The brushless DC dynamo as claimed in claim 1, wherein the circular armature unit is a circular stator, and the magnetic unit is a magnetic rotor. ### Claim 7 (depends on 1) The brushless DC dynamo as claimed in claim 1, wherein the circular armature unit is a circular rotor, and the magnetic unit is a magnetic stator. ### Claim 8 A brushless DC dynamo, comprising: a first circular armature unit, comprising M second circular armature units connected in series, M is a natural number no less than 2, and each second circular armature units comprising: N sets of first armature coils spaced with each other in sequence, and the first set of first armature coil is adjacent to the Nth set of first armature coil and joined with each other; N sets of second armature coils spaced with each other, and the first set of second armature coil is adjacent to the Nth set of second armature coil and joined with each other, wherein the N sets of second armature coils are located outside of the N sets of first armature coils; and a plurality of first wires and a plurality of second wires, and each first wire and each second wire respectively interconnecting between one set of the first armature coils and one set of the second armature coils; wherein, N is a natural number greater than 2, and the (i+1)th set of first armature coil is interconnected to the (i+1)th set of second armature coil by the (i+1)th first wire, and the (i+1)th set of first armature coil is interconnected to the (i+2)th set of second armature coil by the (i+1)th second wire, 1≤(i)≤N−2, and the first set of first armature coil is interconnected to the first set of second armature coil by the 1st first wire, and the first set of first armature coil is interconnected to the second set of second armature coil by the 1st second wire, and the Nth set of first armature coil is interconnected to the Nth set of second armature coil by the Nth first wire, and the Nth set of first armature coil is interconnected to the first set of first armature coil by the Nth second wire; 2M control units, each control unit corresponding to one of the second circular armature units and comprising N first control switches and N second control switches, wherein the (j)th first control switch is interconnected between a first polarity DC power source and a (j)th second wire of a second circular armature unit corresponding to the (j)th first control switch, and the (j)th second control switch is interconnected between a second polarity DC power source with a polarity opposite to the first polarity DC power and a (j)th second wire of a second circular armature unit corresponding to the (j)th second control switch, wherein (j) is a natural number, and 1≤(j)≤N; a magnetic unit, disposed inside the first circular armature unit, comprising M pairs of magnetic poles, wherein the first circular armature unit and the magnetic unit can rotate relatively to each other under control; and a position sensor for detecting the position of the magnetic unit, and outputting the information of magnetic unit's position to the control unit to trigger the control unit to output a control signal to control on or off of the first and second control switches. ### Claim 9 (depends on 8) The brushless DC dynamo as claimed in claim 8, wherein the magnetic unit is a permanent magnet or an electromagnet. ### Claim 10 (depends on 9) The brushless DC dynamo as claimed in claim 9, wherein the position sensor is a resolver, an encoder, a Hall sensor, a photo-interrupter or a photoelectric sensor. ### Claim 11 (depends on 10) The brushless DC dynamo as claimed in claim 10, further comprising a first snubber disposed between the first DC polarity power source and the first control switches, and a second snubber disposed between the second DC polarity power source and the second control switches. ### Claim 12 (depends on 8) The brushless DC dynamo as claimed in claim 8, wherein the first armature coils and the second armature coils are manufactured by wave winding, lap winding or frog-leg winding. ### Claim 13 (depends on 12) The brushless DC dynamo as claimed in claim 12, wherein the first circular armature unit is a circular stator, and the magnetic unit is a magnetic rotor. ### Claim 14 (depends on 12) The brushless DC dynamo as claimed in claim 12, wherein the first circular armature unit is a circular rotor, and the magnetic unit is a magnetic stator.