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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 induction from the magnetic field of the stator winding. [1] An induction motor therefore needs no electrical connections to the rotor.
Japanese National Railways (JNR) began research on a linear propulsion railway system in 1962 with the goal of developing a train that could travel between Tokyo and Osaka in one hour. [5] Shortly after Brookhaven National Laboratory patented superconducting magnetic levitation technology in the United States in 1969, JNR announced development ...
As an example, consider the use of a 10 hp, 1760 r/min, 440 V, three-phase induction motor (a.k.a. induction electrical machine in an asynchronous generator regime) as asynchronous generator. The full-load current of the motor is 10 A and the full-load power factor is 0.8. Required capacitance per phase if capacitors are connected in delta:
A linear induction motor (LIM) is an alternating current (AC), asynchronous linear motor that works by the same general principles as other induction motors but is typically designed to directly produce motion in a straight line. Characteristically, linear induction motors have a finite primary or secondary length, which generates end-effects ...
The EMALS uses a linear induction motor (LIM), which uses alternating current (AC) to generate magnetic fields that propel a carriage along a track to launch the aircraft. [5] [6] The EMALS consists of four main elements: [7] The linear induction motor consists of a row of stator coils with the same function as the circular stator coils in a conventional induction motor.
A small model of their proposal shows a train that looks like the fuselage of a narrow-body airliner running on a monorail track shaped like an upside-down "T". The horizontal portion provided the running surface, while the vertical provided directional tracking and the structure for mounting the reaction rail.
The electric motor in the EV1 operated on a 3-phase AC induction system, generating 137 brake horsepower (102 kW) at 7,000 revolutions per minute (RPMs). [69] [72] The EV1 could maintain its full torque capacity across its entire power range, delivering 110 pound-feet (150 N⋅m) of torque from 0 to 7,000 RPMs.
Electrodynamic suspension can also occur when an electromagnet driven by an AC electrical source produces the changing magnetic field, in some cases, a linear induction motor generates the field. EDS is used for maglev trains, such as the Japanese SCMaglev. It is also used for some classes of magnetically levitated bearings.