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公开(公告)号：US11355977B2
公开(公告)日：2022-06-07
申请号：US16712503
申请日：2019-12-12
发明人： Subhashree Rajagopal , Deena Dayalan Kothandaraman , Sivanagamalleswara Bavisetti , Govind Yadav , Ramakrishna Rao P. V , Harshit Agrawal
IPC分类号： H02K1/2746 , H02K1/18 , H02K1/2786 , H02K21/22 , B64C39/02
摘要： A multi-degree-of-freedom electromagnetic machine includes a spherical structure, a first coil, a second coil, a non-magnetic structure, and a Halbach array. The spherical structure has a first axis of symmetry, a second axis of symmetry, and a third axis of symmetry, and the first, second, and third axes of symmetry are disposed perpendicular to each other. The first coil is wound on the spherical structure about the first axis of symmetry, and the second coil is wound on the spherical structure about the second axis of symmetry. The non-magnetic structure is spaced apart from, and at least partially surrounds, the spherical structure. The Halbach array is mounted on the non-magnetic structure and includes N-magnets, where N is a multiple of 4. The spherical structure and non-magnetic structure are mounted to allow relative rotation between the non-magnetic structure and the spherical structure.
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公开(公告)号：US11063504B2
公开(公告)日：2021-07-13
申请号：US16511419
申请日：2019-07-15
发明人： Deepak Pitambar Mahajan , Renukaprasad N , Ramakrishna Rao P. V , Subhashree Rajagopal , Govind Yadav
摘要： A multi-degree of freedom electromagnetic machine includes a spherical body, an outer structure, a plurality of magnets, and a plurality of windings. Each of the plurality of windings includes a flexible dielectric substrate and an electrical conductor. The flexible dielectric substrate has an inner surface and an outer surface, and the inner surface of the flexible substrate facies the outer surface of the spherical body. The electrical conductor is disposed on at least one of the inner or outer surfaces of the flexible dielectric substrate.
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公开(公告)号：US11581761B2
公开(公告)日：2023-02-14
申请号：US17092451
申请日：2020-11-09
发明人： Subhashree Rajagopal , Pablo Bandera , Govind Yadav , Ramakrishna Rao P. V , Sivanagamalleswara Bavisetti
摘要： A two degree-of-freedom brushless DC motor includes a stator, a rotor, a plurality of distributed stator windings, and a stator voice coil winding. The stator includes an inner stator structure and a plurality of arc-shaped stator poles. The inner stator structure includes a main body and a plurality of spokes that are spaced apart from each other to define a plurality of stator slots. Each arc-shaped stator pole is connected to a different one of the spokes. The rotor is spaced apart from the stator, includes a plurality of magnets, and is configured to rotate about a plurality of perpendicular axes. The distributed stator windings are wound around the plurality of spokes and extend through the stator slots. The stator voice coil winding is wound around the outer surfaces of the arc-shaped stator poles. The arc-shape and spacing of the stator poles define the stator as being spherically shaped.
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公开(公告)号：US11171553B2
公开(公告)日：2021-11-09
申请号：US16518533
申请日：2019-07-22
发明人： Deepak Pitambar Mahajan , Sivanagamalleswara Bavisetti , Ramakrishna Rao P. V , Subhashree Rajagopal , Renukaprasad N
摘要： A stepper motor includes a rotor, a stator, a plurality of stator windings, and a plurality of permanent magnets. The permanent magnets are coupled to the outer surface of the rotor and are spaced apart from the plurality of stator poles, and each permanent magnet is shaped like an arc having an arc length and is circumferentially spaced apart from two adjacent permanent magnets by a spacing angle. In some instance, the arc length of each permanent magnet is equal, and the spacing angles are not all equal. In other instances, the arc length of two or more of the permanent magnets is unequal to the arc lengths of the other permanent magnets, and the spacing angles are not all equal.
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