摘要:
A patterned electret structure (21) on a substrate (10) comprises a dielectric structure comprising at least one non-patterned dielectric layer (22), and a charge pattern (14) in the dielectric structure and/or at a surface of a dielectric layer that is part of the dielectric structure and/or at an interface between dielectric layers that are part of the dielectric structure. By the presence of the non-patterned dielectric layer (22), the influence of the presence of a conductive substrate (10) on the charges (14) of the electret structure (21) is alleviated, hence increasing the charge stability over time. Moreover, in embodiments of the present invention, the charge stability is substantially independent of the width (W1, W2, W3) of the charge pattern. A method for manufacturing such patterned electret structure (21) is also provided.
摘要:
A method of evaluating the condition of a laminated core of an electric machine including positioning a magnetic flux injection excitation yoke extending between a pair of teeth of the laminated core, and the excitation yoke being wound with an excitation winding defining an electrical circuit for producing a magnetic flux excitation. Power is supplied to an excitation winding wound around the yoke to produce a magnetic flux in the yoke and to form a magnetic circuit through the yoke and the laminated core. A characteristic of the electrical circuit of the excitation winding is measured to identify a fault in the magnetic circuit corresponding to an eddy current between individual laminations in the laminated core.
摘要:
A patterned electret structure (21) on a substrate (10) comprises a dielectric structure comprising at least one non-patterned dielectric layer (22), and a charge pattern (14) in the dielectric structure and/or at a surface of a dielectric layer that is part of the dielectric structure and/or at an interface between dielectric layers that are part of the dielectric structure. By the presence of the non-patterned dielectric layer (22), the influence of the presence of a conductive substrate (10) on the charges (14) of the electret structure (21) is alleviated, hence increasing the charge stability over time. Moreover, in embodiments of the present invention, the charge stability is substantially independent of the width (W1, W2, W3) of the charge pattern. A method for manufacturing such patterned electret structure (21) is also provided.
摘要:
An articulated walking device, configured for movement across a surface, includes a frame and a plurality of leg assemblies movably engaged with the frame. Each leg assembly includes a leg member configured to rotate with respect to the frame about first and second axes at least generally transverse to one another. A drive mechanism operatively engaged with the plurality of leg assemblies actuates each of the leg members in like, predetermined, repeatable cycles of movement. The leg members are out of phase with one another, such that sufficient leg members are always supporting the toy device in an upright manner and immediately adjoining leg members do not move together in parallel.
摘要:
The present invention provides a TEG device comprising a first unit comprising a thermopile unit and a second unit comprising a cold plate and/or a radiator. One of the first and second units is adapted for being embedded or implanted into a body, while the other of the first and second units is adapted for being placed at the outer surface of the body, i.e. in a fluid. The first and second units are adapted for being thermally connected to each other through the surface between the body and the fluid when in use.
摘要:
A toy vehicle comprises a lift mechanism which allows the toy vehicle to be lifted from a support surface in a lifting motion and roll end over end over end. The lift mechanism includes a lift arm pivotally mounted to a housing of the toy vehicle. A lift arm actuating motor is coupled to a lift arm drive screw that is in threaded engagement with a lift arm drive nut. A strut is coupled between the drive nut and the lift arm. In operation, the lift arm actuating motor drives the lift arm drive screw and causes the lift arm drive nut to drive the strut and move the lift arm into an extended position, causing the lift arm to engage a support surface to lift the toy vehicle. In the extended position, the toy vehicle is sufficiently rounded to permit the vehicle to roll end over end over end.
摘要:
A system for direct optical control of electronic power semiconductors includes an optical triggering circuit at a first location, wherein said optical triggering circuit generates an optical trigger signal, a power circuit located at a second location remote from the first location, wherein said power circuit includes a photoconductor that is responsive to the optical trigger signal generated by the optical triggering circuit, and an optical cable coupling the optical triggering circuit to the power circuit. In operation, the power circuit is directly driven by the transmission of the optical trigger signal from the optical triggering circuit to the power circuit via the optical cable. Inductive elements or transformers may be applied to facilitate triggering performance.
摘要:
A method of evaluating the condition of a laminated core of an electric machine including positioning a magnetic flux injection excitation yoke extending between a pair of teeth of the laminated core, and the excitation yoke being wound with an excitation winding defining an electrical circuit for producing a magnetic flux excitation. Power is supplied to an excitation winding wound around the yoke to produce a magnetic flux in the yoke and to form a magnetic circuit through the yoke and the laminated core. A characteristic of the electrical circuit of the excitation winding is measured to identify a fault in the magnetic circuit corresponding to an eddy current between individual laminations in the laminated core.
摘要:
Disclosed are thermoelectric systems and methods for manufacturing thermoelectric systems. In one embodiment, a thermoelectric system include a flexible structure and at least one thermocouple unit integrated in or attached to the flexible structure, where each thermocouple unit comprises at least one thermocouple and at least one flexible radiator element thermally connected to a first end of the at least one thermocouple. In another embodiment, a method includes providing a flexible structure, forming at least one thermocouple unit comprising at least one thermocouple and at least one flexible radiator element thermally connected to a first end of the at least one thermocouple, and integrating the at least one thermocouple unit in or attaching the at least one thermocouple unit to the flexible structure.
摘要:
A toy vehicle includes a central housing having first and second oppositely disposed sides. A first wheel is rotatably mounted on the first side of the housing, and a second wheel is rotatably mounted on the second side of the housing. Each of the first and second wheels has a central hub and a plurality of individual vanes rotatably attached to the hub. Each hub has a center disposed along a first axis of rotation. Each vane is rotatable about a second vane axis extending transversely with respect to the first axis. An end of each vane distal to the hub forms a circumferential surface portion of one of the first and second wheels.