Abstract: A bulk acoustic wave resonant structure includes a substrate, and a reflection structure, a first electrode layer, a piezoelectric layer and a second electrode layer, which are sequentially stacked on the substrate, wherein ring-shaped grooves are provided in the piezoelectric layer; and the grooves are located in an active area and are close to an edge of the active area.

Abstract: Provided are a Bacillus coagulans strain VHProbi C08 having a blood glucose reduction efficacy and an application thereof in preparation of a hypoglycemic product. The accession number of the strain is CCTCCM 2019738. Further provided is a hypoglycemic product comprising the Bacillus coagulans VHProbi C08 and/or the fermentation product of Bacillus coagulans VHProbi C08. A carbon source used in the culture medium of the strain is any one or more of fructooligosaccharide, galactooligosaccharides, and inulin.

Abstract: A waterproof cap for electronic devices includes a cover plate and sealing base located on a surface of the cover plate for sealing a port of a housing of the electronic devices. A first lip and a second lip are located on an outer periphery of the sealing base and are spaced apart from each other. The first lip is located between the cover plate and the second lip. When the sealing base is inserted into the port of the housing of the electronic devices, the first lip is configured to tilt toward the cover plate, and the second lip is configured to tilt away from the cover plate.

Abstract: A waterproof cap for electronic devices includes a cover plate and sealing base located on a surface of the cover plate for sealing a port of a housing of the electronic devices. A first lip and a second lip are located on an outer periphery of the sealing base and are spaced apart from each other. The first lip is located between the cover plate and the second lip. When the sealing base is inserted into the port of the housing of the electronic devices, the first lip is configured to tilt toward the cover plate, and the second lip is configured to tilt away from the cover plate.

Abstract: A stator for an electric motor has a laminated stator core 10 formed from a plurality of stacked laminations, and a stator winding formed from a plurality of coils 20 wound on bobbins 30. The stator core 10 has a plurality of teeth 40 which extend radially and alternately spaced between and connected to circumferentially extending yokes 50. The yokes and the teeth are separately formed with each yoke 50 being a stack of yoke laminations 12 and each tooth 40 being a stack of tooth laminations 14. The teeth 40 are inserted through the bobbins 30 and arranged in a cylindrical form with each tooth 40 extending radially. Yokes 50 are then fixed between radially outer ends 144 of adjacent teeth to complete the radially outer portion of the stator core. Each tooth 40 has a radial location surface 144b which contacts an inner surface of the adjacent yokes 50. The yokes 50 and teeth 40 are fixed together by welding the yokes 50 to the outer ends 144 of the teeth 40.

Abstract: A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axially, and the centers of adjacent magnets of a rotor pole are staggered by a mechanical angle in the circumferential direction of the rotor.

Abstract: A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axially, and the centers of adjacent magnets of a rotor pole are staggered by a mechanical angle in the circumferential direction of the rotor.

Abstract: A stator for an electric motor has a laminated stator core 10 formed from a plurality of stacked laminations, and a stator winding formed from a plurality of coils 20 wound on bobbins 30. The stator core 10 has a plurality of teeth 40 which extend radially and alternately spaced between and connected to circumferentially extending yokes 50. The yokes and the teeth are separately formed with each yoke 50 being a stack of yoke laminations 12 and each tooth 40 being a stack of tooth laminations 14. The teeth 40 are inserted through the bobbins 30 and arranged in a cylindrical form with each tooth 40 extending radially. Yokes 50 are then fixed between radially outer ends 144 of adjacent teeth to complete the radially outer portion of the stator core. Each tooth 40 has a radial location surface 144b which contacts an inner surface of the adjacent yokes 50. The yokes 50 and teeth 40 are fixed together by welding the yokes 50 to the outer ends 144 of the teeth 40.