Full-voltage starters (manual and magnetic) apply full voltage directly to motor terminals.
Some machines or loads may require a gentle start and smooth acceleration up to full speed.
Many starters apply reduced voltage to motor windings, primary resistor, primary reactor, autotransformer and solid state. Part winding and wye-delta starters can also provide reduced-voltage starting, although technically they are not reduced-voltage starters.
Motors should have protection for themselves, in the branch circuit, and in the feeder line. Protection provided by fuses and circuit breakers guards against fault conditions caused by short circuits or grounds and over currents exceeding locked-rotor values.
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
Calculate amps, hp and kVA for electrical motors.
Calculate electric motor efficiency.
Full load operating torque vs. break down, pull up and locked rotor torque.
Calculate electric motors shaft power.
Direct-on-line starters, star-delta starters, frequency drives and soft starters.
Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.
Convert between single phase (120, 240 and 480 Voltage) and three phase (240 and 480 Voltage).
Inductive loads and power factors with electrical three-phase motors.
Avoid overheated variable frequency drives with adequate ventilation.
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