DC injection braking is a method of slowing AC electric motors.
1969: Demag introduces the first AC motor with a sliding rotor on its crane product in the USA.
Flux linkage is commonly used to estimate the magnetic flux of an AC machine.
When the core is subjected to a changing magnetic field, as it is in devices that use AC current such as transformers, inductors, and AC motors and alternators, some of the power that would ideally be transferred through the device is lost in the core, dissipated as heat and sometimes noise.
A motor soft starter is a device used with AC electric motors to temporarily reduce the load and torque in the powertrain and electrical current surge of the motor during startup.
In the past shunt-motors have been used for this purpose, nowadays asynchronous AC motors are being used or AC motors in combination with a variable frequency drive.
They remained the predominant type of industrial motor controller until the end of the 1980s when the availability of low cost electronics led to their replacement by chopper drives for high performance systems and inverters for high reliability with AC motors.
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