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AssigneeSmartmotor AS
InventorsErik Mathias Husum, Alexey Matveev, Tina Skare Pryde, Astrid Rökke, Stig Ove Stornes, Sigurd Övrebö
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The purpose is to accommodate large axial channels in a slim electric machine without sacrificing its torque density and radial dimensions. This is possible with a rotor (11) provided with permanent magnets (12) and a stator (13) with slots (15) for coils (20A-c), where the slots (15) are separated by teeth (16, 17), which electrical machine include teeth (17) not carrying coils (20A-c), which teeth (17) are provided with axial channels (18, 18′) protruding into the teeth (17) and neighboring back iron so that an area of the channel (18, 18′) inside the tooth (17) is comparable to or even larger than the an area of the channel (18, 18′) in the back iron. The channels serve for transportation of fluids and other substances through the machine and also to integrate a motor protector, which may be required in down-hole applications. There are also novel manufacturing techniques associated with the new concept.
1-21. (canceled)
An electrical machine, particularly a motor or generator, with at least three phases, comprising a rotor (11) provided with permanent magnets (12) and a stator (13) with slots (15) for coils (20A-C) to provide phase windings, said slots (15) being separated by teeth (16, 17), wherein some of said teeth (16) are carrying coils (20A-C), and some of said teeth (17) are not carrying coils, and wherein said teeth (17) not carrying coils are provided with axial channels (18, 18′) protruding into said teeth (17) not carrying coils and a neighboring back iron so that an area of said channels (18, 18′) inside each of said teeth (17) not carrying coils is comparable to or even larger than an area of said channel (18, 18′) in said back iron.
A rotor (11) comprising a shaft (23A) and permanent magnets (12) attached to said shaft (23A), and wherein the magnets (12) are segmented, a stator (13) with slots (15) for coils (20A-C) to provide phase windings, said slots (15) being separated by teeth (16, 17), wherein some of said teeth (16) are carrying coils (20A-C), and some of said teeth (17) are not carrying coils, and wherein said teeth (17) not carrying coils are provided with axial channels (18, 18′) protruding into said teeth (17) not carrying coils and a neighboring back iron so that an area of said channels (18, 18′) inside each of said teeth (17) not carrying coils is comparable to or even larger than an area of said channel (18, 18′) in said back iron.
Dependencies are inferred from the claim text.