Linear Motor


Also found in: Dictionary, Wikipedia.
Related to Linear Motor: Linear actuator

linear motor

[′lin·ē·ər ′mōd·ər]
(electricity)
An electric motor that has in effect been split and unrolled into two flat sheets, so that the motion between rotor and stator is linear rather than rotary.

Linear Motor

 

an electric motor in which one of the components of the magnetic system is open and has an unfolded winding, which generates a traveling magnetic field, and the other component is designed as a guiding member to produce linear displacement of the moving part of the motor. A DC linear motor consists of an armature, with a winding located on it that also serves as a commutator (guiding component), and an open magnetic circuit whose field windings (the moving part) are so arranged that the force vectors arising under the poles of the magnetic circuit are of identical direction. In such a motor, regulation of the speed of the moving part is very simple.

Alternating-current linear motors may be asynchronous or synchronous. The armature of an asynchronous linear motor is in the shape of a bar, usually of rectangular cross section, and has no windings; it is mounted along the path of travel of the moving part of the motor. The moving part has a magnetic circuit with unfolded polyphase windings connected to a source of alternating current. The interaction of the magnetic field in the magnetic circuit of the moving part with the armature field generates forces that cause accelerated displacement of the moving part of the motor with respect to the fixed armature. The displacement continues until the velocity of the motor and the velocity of the traveling magnetic field become equal. A very promising development is the use of asynchronous linear motors in electric traction drives for transportation vehicles in combination with magnetic cushions and air cushions, which makes possible an increase in the running speed of trains to 450–500 km/hr. Virtually no synchronous linear motors are made. The main advantage of a linear motor is its ability to generate large forces and, as a result, to develop significant acceleration. The latter is important for transportation vehicles. The absence of reduction gears in the motor is also considered an advantage.

REFERENCE

Knuth, I. “Elektrische Maschinen mit geradliniger Bewegung und ihre technische Anwendung.” Elektro-Praktiker, 1969, no. 1.

IU. M. IN’KOV

References in periodicals archive ?
The SDLM-019-070-01-01 direct drive linear motor has a stroke length of 0.
Linear motor stages are typically among the most costly because of their use of rare earth magnets and linear encoders, among other reasons.
A design that integrates the industry's first non-analog magnetic linear encoder into a linear motor.
ElectroPuls is driven by a linear synchronous motor and requires additional highquality velocity feedback for precise dynamic control--due to the challenges of driving linear motors with lower inherent damping than traditional rotary designs.
Compliant with the ISO 5840 standard for heart valve durability assessment, the DuraPulse system is designed for maintenance-free, multi-billion-cycle operation and comes with the industry's only 10-year warranty on the system's linear motor.
In common with Dunkermotoren's existing BG Series of DC brushless rotary motors, the STll range of linear motors has been extended with an integrated controller option that offers ease of integration with significantly reduced and simplified wiring.
8226; ServoTube Moving-Rod Linear Motor Actuators with standard integrated positioning sensors for [+ or -]12 micron repeatability and [+ or -]350 micron absolute accuracy for motion control and simple drop-in pneumatic cylinder replacement
9, 2012 (CENS) -- The Taiwan-based CHMER EDM, a leading supplier in the EDM (electrical-discharge machine) industry, confirmed recently that its newest CNC (computer numerically controlled) machining center with a linear motor is scheduled for launch in the third quarter of this year, poised to further boost its position in the line.
14 -- Newport has unveiled the new IMS-LM-SA Series of long-travel linear motor stages.
The Nagoya-based company, more widely known as JR Tokai, is considering having Kodama express trains stop at the station in the town of Samukawa, south of Tokyo, after the launch of linear motor car services planned for 2027, the officials said.
Launch of Tokyo-Nagoya linear motor car likely to be postponed
The all-in-one solution consists of base plate with linear motor, bearings, encoder carriage plate and cover with a cable management system featuring plug in cabling to a Servo Drive.