Stator cooling structure for multi-shaft, multi-layer electric motor
First Claim
1. A multi-shaft, multi-layer motor comprising:
- an inner rotor;
an outer rotor surrounding the inner rotor;
a stator assembly disposed coaxially between the inner and outer rotors, the stator assembly comprising;
a plurality of laminated members arranged regularly around a center axis of the motor, and each provided with a coil;
a portion defining a coolant introduction passage to introduce a coolant for drawing off heat produced by the coils;
a coolant distributing annular cover member including a circumferential partition wall separating a first circumferential coolant passage and a second circumferential coolant passage, the first circumferential coolant passage including an inlet end connected with the introduction passage, to receive the coolant from the introduction passage;
a coolant distributing plate member formed with first holes communicating with the first circumferential coolant passage, and second holes communicating with the second circumferential coolant passage;
portions defining first axial coolant passages each extending, in an axial direction of the motor, from a first axial end communicating with one of the first holes, to a second axial end;
portions defining second axial coolant passages each extending, in the axial direction, from a second axial end to a first axial end communicating with one of the second holes;
a U-turn cover member formed with connecting portions each to connect the second ends of one of the first axial passages and one of the second axial passages which are adjacent to each other in a circumferential direction around the center axis; and
a portion defining a coolant discharge passage connected with an outlet end of the second circumferential passage, and arranged to discharge the coolant from an outlet end of the second circumferential passage.
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Accused Products
Abstract
A multi-shaft, multi-layer motor has a stator coaxially disposed between inner and outer rotors which are driven independently by a compound current. For cooling stator coils, first through last branch coolant passages are arranged around the axis. The upstream ends of the first through last branch passages are arranged in sequence circumferentially along a distributing circumferential passage in a direction away from a common introduction port for introducing the coolant into the distributing circumferential passage, and the downstream ends of the first through last branch passages are distributed in sequence circumferentially along a collecting circumferential passage in a direction toward a common discharge port for discharging the coolant from the collecting circumferential passage.
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Citations
14 Claims
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1. A multi-shaft, multi-layer motor comprising:
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an inner rotor;
an outer rotor surrounding the inner rotor;
a stator assembly disposed coaxially between the inner and outer rotors, the stator assembly comprising;
a plurality of laminated members arranged regularly around a center axis of the motor, and each provided with a coil;
a portion defining a coolant introduction passage to introduce a coolant for drawing off heat produced by the coils;
a coolant distributing annular cover member including a circumferential partition wall separating a first circumferential coolant passage and a second circumferential coolant passage, the first circumferential coolant passage including an inlet end connected with the introduction passage, to receive the coolant from the introduction passage;
a coolant distributing plate member formed with first holes communicating with the first circumferential coolant passage, and second holes communicating with the second circumferential coolant passage;
portions defining first axial coolant passages each extending, in an axial direction of the motor, from a first axial end communicating with one of the first holes, to a second axial end;
portions defining second axial coolant passages each extending, in the axial direction, from a second axial end to a first axial end communicating with one of the second holes;
a U-turn cover member formed with connecting portions each to connect the second ends of one of the first axial passages and one of the second axial passages which are adjacent to each other in a circumferential direction around the center axis; and
a portion defining a coolant discharge passage connected with an outlet end of the second circumferential passage, and arranged to discharge the coolant from an outlet end of the second circumferential passage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multi-shaft, multi-layer motor comprising:
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an inner rotor;
an outer rotor surrounding the inner rotor; and
astator assembly disposed coaxially between the inner and outer rotors, the stator assembly comprising;
a plurality of stator segments arranged around a center axis of the motor, each of the stator segments including a stator coil;
portions defining first through last branch passages arranged around the center axis, each of the branch passages extending from an upstream end to a downstream end to cool the stator coils; and
a distributing section defining a distributing circumferential passage to deliver a coolant from a common introduction port to the upstream ends of the first through last branch passages, and a collecting circumferential passage to convey the coolant from the downstream ends of the first through last branch passages to a common discharge port, the distributing circumferential passage and the collecting circumferential passage extending circumferentially around the center axis, the upstream ends of the first through last branch passages being arranged in sequence along the distributing circumferential passage in a direction away from the common introduction port, and the downstream ends of the first through last branch passages being distributed in sequence along the collecting circumferential passage in a direction toward the common discharge port. - View Dependent Claims (9, 10, 11, 13, 14)
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12. A multi-shaft, multi-layer motor comprising:
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an inner rotor;
an outer rotor surrounding the inner rotor, and a stator assembly disposed coaxially between the inner and outer rotors, the stator assembly comprising;
a plurality of stator segments arranged around a center axis of the motor, each of the stator segments including a stator coil;
means for defining first through last branch passages arranged around the center axis, each of the branch passages extending from an upstream end to a downstream end to cool the stator coils; and
means for defining a distributing circumferential passage to deliver a coolant from a common introduction port to the upstream ends of the first through last branch passages, and a collecting circumferential passage to convey the coolant from the downstream ends of the first through last branch passages to a common discharge port;
means for arranging the upstream ends of the first through last branch passages in a row along the distributing circumferential passage in a direction away from the common introduction port; and
means for arranging the downstream ends of the first through last branch passages in a row along the collecting circumferential passage in a direction toward the common discharge port.
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Specification