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The first machine was built from recycled scrap steel and coil windings in his basement. [3] In 1935, Miller Electric Mfg. Co. was incorporated. Al Mulder, Miller's sole engineer, invented the world's first high frequency-stabilized AC industrial welder, making AC welding practical for use in factories and construction. [citation needed]
Instead of directly driving the coil with a high voltage, a series resonant circuit may be used to provide the high voltage. [7] A series capacitor is added in series with the coils. The capacitance is chosen to resonate the coil at the desired frequency. Only the coils parasitic resistance remains.
A magnetic starter has a contactor and an overload relay, which will open the control voltage to the starter coil if it detects an overload on a motor. [1] [2] The overload relay opens a set of contacts that are wired in series with the supply to the contactor feeding the motor. The characteristics of the heaters can be matched to the motor so ...
A ferrite core coil is a variety of coil with a core made of ferrite, a ferrimagnetic ceramic compound. [13] Ferrite coils have lower core losses at high frequencies. A coil with a core which forms a closed loop, possibly with some narrow air gaps, is called a closed-core coil.
A starter solenoid is an electromagnet which is actuated to engage the starter motor of an internal combustion engine. It is normally attached directly to the starter motor which it controls. Its primary function is as the actuating coil of a contactor (a relay designed for large electric currents) which connects the battery to the starter ...
A motor soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the powertrain and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network ...