Abstract:
A linear motor and a method of producing the linear motor are provided to reduce a leak magnetic flux flowing between an armature and a moving element to reduce a one-direction magnetic attraction force generated between the armature and the moving element. The linear motor includes the armature having a core formed of a magnetic body and a winding wound around the core, and the moving element supported so as for the moving element to move relatively to the armature via a gap, magnetic pole teeth disposed above and below the moving element, disposed at predetermined pitches along a moving direction of the moving element and disposed opposite to each other via the moving element, and a winding for exciting the magnetic pole teeth such that adjacent and opposite magnetic pole teeth have different magnetic poles, and the moving element is reciprocated relatively to the armature by exciting the winding according to a predetermined control circuit.
Abstract:
A linear motion device is disclosed which includes an armature assembly, and a field assembly which includes a plurality of permanent magnets each having a length, and a plurality of permanent magnets and the length of the plurality of pole pieces is tailored to achieve a constant force versus stroke characteristic, when sinusoidal commutation is used.
Abstract:
A linear synchronous motor with improved traction performance linearization increased reliability and ease of maintenance, consist of a stator, comprising at least one ferromagnetic yoke on which permanent magnets having the alternate polarity are secured and bearings on which a frame with armature and windings are mounted. The magnetic caves and the control windings formed by plurality of electromagnetic modules are secured in the frame are mounted relative to each other with a spatial phase shift in the direction of motion. The frame is provided with passages allowing the flow coolant and has openings for mounting the electromagnetic modules.
Abstract:
The invention relates to a device for vertically transporting products, especially semiconductor wafers and discs. The aim of the invention is to configure such a device in such a way that mechanical abrasion cannot be caused and that mechanical impacts are basically prevented. According to the invention, a device contains a load unit and a drive for vertically moving the load unit. The load unit and the drive are configured in such a way that said unit and drive are coupled to one another without touching each other and that friction pairing is not involved by virtue of magnetic components. Magnetised superconducting moulded parts having a frozen magnetic field are provided. Said parts form a magnetic track holding device for the load unit and guarantee a constant air gap between the load unit and the permanent magnet rails by engaging with vertical permanent magnet rails. The moulded parts are cooled down to a temperature by means of a cooling agent, whereby said temperature is required for the superconducting state. The drive is provided with one or more electromagnetic linear drives. The device can be used in a particularly advantageous manner in clean rooms for vertically transporting products between different levels.
Abstract:
Method and apparatus are provided for selectively tailoring electromagnetic fields, and in particular for providing rapidly vanishing magnetic far-fields for magnet arrays, coils and the like. The method involves selectively combining magnetic, coil or other arrays having fields that vanish as 1/r to achieve and array having a selectively increase l value. Various techniques for achieving such combinations in one, two or three dimensions, and the arrays resulting from such combination are disclosed.
Abstract translation:提供了用于选择性地调整电磁场的方法和装置,特别是用于为磁体阵列,线圈等提供快速消失的磁远场。 该方法包括选择性地组合具有消除为1 / r 1的场的磁性,线圈或其它阵列以实现具有选择性增加的值的阵列。 公开了用于实现一维,二维或三维的这种组合的各种技术以及由这种组合产生的阵列。
Abstract:
A high-speed precision positioning apparatus has a stage (102) supported by a platen (104). The stage is driven by a plurality of drive motors (112a, 112b, 112c, 112d) that are co-planar with the stage and arranged symmetrically around the stage. The drive motors apply drive forces directly to the stage without any mechnical contact to the stage. The drive forces impart planar motion to the stage in at least three degrees of freedom of motion. In the remaining three degrees of freedom the motion is constrained by a plurality of fluid bearings (144a, 144b, 144c, 144d) that operate between the stage and the platen. The drive motors are configured as magnets, attached to the stage, moving in a gap formed in-between top and bottom stationary coils. Integral force cancellation is implemented by a force cancellation system that applies cancellation forces to the stage. The cancellation forces, which are co-planar with a center of gravity of the stage and any components that move with the stage, cancel forces generated by planar motion of the stage. Interferometric encoders are used as position detectors.
Abstract:
Disclosed is a planar motor device capable of effectively restraining thermal influence on the environment. When an electric current is supplied to armature coils (38) opposed to the magnet of a movable member (51), the movable member (51) is driven along a movement surface (21a) by electromagnetic force. When the movable member (51) is continued to be driven in a certain direction, electric current is supplied to the armature coils (38) opposed to the magnet for each movement position of the movable member (51), whereby the armature coils (38) supplied with electric current generate heat. The armature coils (38) are accommodated in a vacuum chamber (41) in a base (21), and are arranged so as to be in contact with a stator yoke (43), with a predetermined gap being defined between them and a ceramic plate (36) forming the vacuum chamber (41). Thus, the heat transmission from the armature coils (38) to the movement surface (21a) side is effected substantially by radiation alone, so that it is possible to effectively restrain thermal influence on the environment.
Abstract:
The aim of the invention is to change the yarn (F) in a winding frame (1) within a traverse (H) and at a high speed by using a pointer-shaped yarn guide, hereafter referred to as the pointer. To this end, the pointer is tapered with regard to shape and weight toward the free end, whereby in a preferred embodiment, a polynomial of at least one degree is used. In addition, the yarn is guided on a guide plate (6). The control (12) of the motor (8) is provided such that the pointer (7) can not only be provided for guiding the yarn (F) within the traverse (H), but such that the pointer stops in a position (C) within the changing traverse (H) in order to form an end bead on a ready-made spool. The pointer also stops in a position (A and B) outside the changing traverse (H) in order to permit the yarn to be grasped by a new core when drawn in (8) during a changing of the spool, whereas in position (B), the yarn is wound on said core to form a yarn reserve winding before the yarn is driven back once again in the traverse (H) by the pointer (7). The selected reverse points can be entered into the control, and the control and the motor are able to reverse the pointer at a selected reverse point. For that purpose, reverse means are provided which preferably operate in a contactless manner, e.g. electromagnetically. The same principles can also be used for other applications in which a lever must effect a swiveling movement over a predetermined traverse.
Abstract:
The invention relates to a drive element for the movable contact point of a high voltage power circuit breaker, especially an SF6 power circuit breaker. According to the invention, the movable contact point can be connected to the moveable part of an electric linear motor which is controlled according to the power consumption and/or to the specified opening speed. The linear motor is advantageous in that internal frictional forces do not exist, leakages such as those in hydraulic drive elements do not occur and, therefore, the drive element requires low maintenance.
Abstract:
The aim of the invention is to eliminate dynamic undulation almost entirely in a linear synchronous motor.To achieve this, said motor comprises at least one primary component (1) and at least one secondary component (6) that has a series of poles (10) formed by permanent magnets and is also longer in the direction of movement (5) than the primary component (1). The primary component (1) has grooves (9) that are suitable for accommodating single-phase or multi-phase windings. The primary component (1) also comprises means that modify the magnetic force in the direction of movement (5) of said linear synchronous motor in the vicinity of the end parts (2) of the primary component (1). The front faces (14) of the end parts (2) run perpendicular to the direction of movement (5) of the linear motor.