Free-body diagram of a U-channel synchronous linear motor. The view is perpendicular to the channel axis. The two coils at centre are mechanically connected, and are energized in "quadrature" (meaning a phase difference of 90° (π/2 radians) between the flux of the magnets and the flux of the coils). The bottom and upper coils in this particular case have a phase difference of 90°, making this a two phase motor (not to scale).Synchronous linear motors are straightened versions of permanent magnet rotor motors.
A linear motor is an electric motor that has had its stator and rotor "unrolled", thus, instead of producing a torque (rotation), it produces a linear force along its length. However, linear motors are not necessarily straight. Characteristically, a linear motor's active section has ends, whereas more conventional motors are arranged as a continuous loop.
A typical mode of operation is as a Lorentz-type actuator, in which the applied force is linearly proportional to the current and the magnetic field .
Linear motors are most commonly found in high accuracy engineering[1] applications.
Many designs have been put forward for linear motors, falling into two major categories, low-acceleration and high-acceleration linear motors. Low-acceleration linear motors are suitable for maglev trains and other ground-based transportation applications. High-acceleration linear motors are normally rather short, and are designed to accelerate an object to a very high speed; for example, see the coilgun.
High-acceleration linear motors are typically used in studies of hypervelocity collisions, as weapons, or as mass drivers for spacecraft propulsion.[citation needed] They are usually of the AC linear induction motor (LIM) design with an active three-phase winding on one side of the air-gap and a passive conductor plate on the other side. However, the direct current homopolar linear motor railgun is another high acceleration linear motor design. The low-acceleration, high speed and high power motors are usually of the linear synchronous motor (LSM) design, with an active winding on one side of the air-gap and an array of alternate-pole magnets on the other side. These magnets can be permanent magnets or electromagnets. The motor for the Shanghai maglev train, for instance, is an LSM.
linearmotor is an electric motor that has had its stator and rotor "unrolled", thus, instead of producing a torque (rotation), it produces a linear force...
A linear induction motor (LIM) is an alternating current (AC), asynchronous linearmotor that works by the same general principles as other induction motors...
line), in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer...
when stationary, linearly decreasing as velocity increases. Some limitations of brushed motors can be overcome by brushless motors; they include higher...
straight-line force along its length. Linearmotors are most commonly induction motors or stepper motors. Linearmotors are commonly found in roller-coasters...
A tubular linearmotor is a type of linear electric motor with a forcer consisting of a series of solenoids wrapped around a cylinder enclosing a movable...
11.1 V). The motor may not reach this theoretical speed because there are non-linear mechanical losses. On the other hand, if the motor is driven as a...
producing linear motion instead of rotation. The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous...
dimension. The linear motion can be of two types: uniform linear motion, with constant velocity (zero acceleration); and non-uniform linear motion, with...
A linear alternator is essentially a linearmotor used as an electrical generator. An alternator is a type of alternating current (AC) electrical generator...
Linear actuator Linear element Linear foot Linear system Linear programming Linear differential equation Bilinear Multilinear LinearmotorLinear interpolation...
electrodynamic suspension (EDS). Propulsion is typically provided by a linearmotor. The power needed for levitation is typically not a large percentage...
series DC motor connects the armature and field windings in series with a common D.C. power source. The motor speed varies as a non-linear function of...
reluctance linearmotors (SRLMs) (also known as linear switched reluctance motors (LSRMs), variable reluctance linearmotor or switched reluctance linear machines)...
pneumatic motors must overcome inefficiencies before being seen as a viable option in the transportation industry. In order to achieve linear motion from...
A railgun or rail gun is a linearmotor device, typically designed as a weapon, that uses electromagnetic force to launch high-velocity projectiles. The...
In 1996 Premier Rides debuted the first coasters ever to use linear induction motors, and in 1997 opened Batman & Robin: The Chiller at Six Flags Great...
servomotor (or servo motor or simply servo) is a rotary or linear actuator that allows for precise control of angular or linear position, velocity, and...
conventional electric motors, but the two newest lines, the Nagahori Tsurumi-ryokuchi Line and Imazatosuji Line, use linearmotor-powered trains, which...
"LinearMotor Girl" is the first major label single (sixth overall) of Japanese electropop girl group Perfume. It was released on September 21, 2005 in...
the scheme of operation (rotation or linear translation). Ultrasonic motors differ from other piezoelectric motors in several ways, though both typically...
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor that produces torque is obtained by electromagnetic...
acting upon it after it exits the muzzle. Alternatively, new-concept linearmotor weapons may employ an electromagnetic field to achieve acceleration,...
Electrostatic motors. de Queiroz, Antonio Carlos M., "An Electrostatic LinearMotor". 24 January 2002. William J. Beaty, "Simple Electrostatic Motor". "ElectrostaticMotor"...
and falling. The top speed meanwhile will be reached using a pair of linearmotor launches on each side. Starfall Racers will run with up to four trains...
referred to as "circuits"). Linear electrical networks, a special type consisting only of sources (voltage or current), linear lumped elements (resistors...
Global Information
