Energy economizer controlled-current start and protection for induction motors

摘要: A standard, unmodified induction motor (11) starts with reduced input current, energy consumption and mechanical stress is further protected from AC power source "phase loss", excessively low or high voltage a locked-rotor condition during start-up any subsequent moment while running when its stator winding (13,14,15) energized sine wave (300) thrkough signal-responsive modifier EET-IC operative to control the portion of each cycle which coupled said winding. current sampling arrangement (6, 7, 8), demodulator responsive first few hundred microseconds initial inrush time increases zero cooperate under certain conditions produce signals for controlling associated means, thereby achieve preferred magnitude starting rated load near-optimum operating efficiency loads protection means (4) inhibits de- energise that occur attempted later running, an anomaly occurs would otherwise cause stalling, excessive stalling loads.