Abstract: A system for reducing inrush loading when a source power is restored includes a device for switching power that selectively connects a load to the source of power and a circuit for measuring the AC voltage at the source and for determining when the AC voltage is within operating range. Responsive to the AC voltage being within operating range, the system delays for a time period then connects the load to the source of power by way of the device for switching power.

Abstract: A system for reducing inrush loading when a source power is restored includes a device for switching power that selectively connects a load to the source of power and a circuit for measuring the AC voltage at the source and

Abstract: A system for controlling power from an AC voltage to an induction motor to reduce surge when power is restored to a power grid is disclosed including, a device for switching power to the induction motor that has a trigger controllable to enable the device to provide a variable amount of power to the induction motor. The system includes a second device for measuring the AC voltage at the source to determine when power is available, hence determining when the AC voltage is within operating range. Responsive to the AC voltage coming within operating range, the system delays for a time period then initiates power to the induction motor by controlling the device for switching power.

Abstract: A system for controlling power from an AC voltage to an induction motor to reduce surge when power is restored to a power grid is disclosed including, a device for switching power to the induction motor that has a trigger controllable to enable the device to provide a variable amount of power to the induction motor. The system includes a second device for measuring the AC voltage at the source to determine when power is available, hence determining when the AC voltage is within operating range. Responsive to the AC voltage coming within operating range, the system delays for a time period then initiates power to the induction motor by controlling the device for switching power.

Abstract: A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually increasing the power while monitoring changes in current drawn by the motor, thereby detecting when maximum efficiency is found. Once maximum efficiency is found, the nominal motor current is found and operating ranges are set. Now, the phase angle between the voltage and the current to the motor is measured and power to the motor is increasing when the phase angle is less than a minimum phase angle (determined during soft-start) and power to the motor is decreased when the phase angle is greater than or equal to the minimum phase angle as long as the voltage does not fall below a minimum voltage determined during soft-start.

Abstract: A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually increasing the power while monitoring changes in current drawn by the motor, thereby detecting when maximum efficiency is found. Once maximum efficiency is found, the nominal motor current is found and operating ranges are set. Now, the phase angle between the voltage and the current to the motor is measured and power to the motor is increasing when the phase angle is less than a minimum phase angle (determined during soft-start) and power to the motor is decreased when the phase angle is greater than or equal to the minimum phase angle as long as the voltage does not fall below a minimum voltage determined during soft-start.

Abstract: A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually increasing the power while monitoring changes in current drawn by the motor, thereby detecting when maximum efficiency is found. Once maximum efficiency is found, the nominal motor current is found and operating ranges are set. Now, the phase angle between the voltage and the current to the motor is measured and power to the motor is increasing when the phase angle is less than a minimum phase angle (determined during soft-start) and power to the motor is decreased when the phase angle is greater than or equal to the minimum phase angle as long as the voltage does not fall below a minimum voltage determined during soft-start.