A device and a plurality of methods for transporting are disclosed. One method includes moving a plurality of transport movement devices (14) along a guide track (22) by use of a linear motor system. A long stator (16) of the linear motor system has, along a portion of the guide track (22), a predetermined functional region. The method includes portion-wise varying of a magnetic field generation of the long stator (16) within the predetermined functional region (46) for successive transport movement devices of the plurality of transport movement devices (14). It is thus possible to achieve various advantages, such as for example prolonging the motor service life, preventing emergency shut-offs, increased performance of the long stator linear motor and/or allowing smaller dimensioning of the long stator (16).

In an actuator, an unnecessarily large load is prevented from being applied to a shaft and a workpiece. There are included a force sensor, an output of which is according to a force applied to a connecting member connected to the shaft, an amplifier that amplifies the output of the force sensor, and a low-pass filter, and a load applied to the shaft is detected based on an output from the amplifier until the shaft or a member associated with the shaft comes in contact with another member, and thereafter, the load applied to the shaft is detected based on an output from the low-pass filter.

Aspects of the invention provide methods and systems for moving moveable stages relative to a stator. A stator is operationally divided into multiple stator tiles. The movement of the one or more moveable stages is controlled by a plurality of controllers (each assigned particular control responsibilities). A controller is provided for each stator sector, where each stator sector comprises a group of one or more stator tiles. Controllers from neighboring sectors share various information to facilitate controllable movement of one or more moveable stages relative to the stator.

Aspects of the invention provide methods and systems for moving moveable stages relative to a stator. A stator is operationally divided into multiple stator tiles. The movement of the one or more moveable stages is controlled by a plurality of controllers (each assigned particular control responsibilities). A controller is provided for each stator sector, where each stator sector comprises a group of one or more stator tiles. Controllers from neighboring sectors share various information to facilitate controllable movement of one or more moveable stages relative to the stator.

A method and system that control a driving system to generate driving signals comprising a sequence of full bridge outputs to control an output velocity of at least one at least partially resonant actuator device. The drive system is adjusted to modify a width of one or more pulses of one of the full bridge outputs for a first range of gain or another one of the full bridge outputs for a second range of the gain to less than fifty percent of a period of the fixed drive frequency of the driving signals to achieve a new gain. The adjusted driving signal is provided to the at least one at least partially resonant actuator device.

A method and system that control a driving system to generate driving signals comprising a sequence of full bridge outputs to control an output velocity of at least one at least partially resonant actuator device. The drive system is adjusted to modify a width of one or more pulses of one of the full bridge outputs for a first range of gain or another one of the full bridge outputs for a second range of the gain to less than fifty percent of a period of the fixed drive frequency of the driving signals to achieve a new gain. The adjusted driving signal is provided to the at least one at least partially resonant actuator device.

A method for constructing an active magnetic bearing controller based on a look-up table method includes: building finite element models of an active magnetic bearing to obtain two universal Kriging prediction models in X-axis and Y-axis directions about actual suspension forces being in association with actual displacement eccentricities and actual control currents in the X-axis and Y-axis directions of the active magnetic bearing based on a universal Kriging model; creating two model state tables in the X-axis and Y-axis directions about the actual suspension forces being in association with the actual displacement eccentricities and the actual control currents to construct two look-up table modules with the two built-in model state tables, respectively; and constructing an active magnetic bearing controller by using two fuzzy adaptive PID controllers, two amplifier modules in the X-axis and Y-axis directions, the two look-up table modules, and two measurement modules in the X-axis and Y-axis directions.

A system (500) for controlling a linear alternating current (AC) electrodynamic machine (400) includes a linear AC electrodynamic machine (400) with a stationary part (410) with a plurality of discrete stationary sections (412, 414, 416), each stationary section (412, 414, 416) having a poly-phase circuit; a variable frequency drive (VFD) (510) configured to be coupled to a utility power source and to provide output currents, wherein the VFD (510) is operable coupled to the stationary part (410) of the linear AC electrodynamic machine (400) for powering and controlling the stationary sections (412, 414, 416) of the stationary part (410); and a plurality of switches (512, 514, 516) coupled between the VFD (510) and the stationary part (410), wherein the plurality of switches (512, 514, 516) allow connecting or disconnecting the VFD (510) to or from the stationary sections (412, 414, 416).

A system (500) for controlling a linear alternating current (AC) electrodynamic machine (400) includes a linear AC electrodynamic machine (400) with a stationary part (410) with a plurality of discrete stationary sections (412, 414, 416), each stationary section (412, 414, 416) having a poly-phase circuit; a variable frequency drive (VFD) (510) configured to be coupled to a utility power source and to provide output currents, wherein the VFD (510) is operable coupled to the stationary part (410) of the linear AC electrodynamic machine (400) for powering and controlling the stationary sections (412, 414, 416) of the stationary part (410); and a plurality of switches (512, 514, 516) coupled between the VFD (510) and the stationary part (410), wherein the plurality of switches (512, 514, 516) allow connecting or disconnecting the VFD (510) to or from the stationary sections (412, 414, 416).

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.