Abstract: A system for applying maximum driving efficiency point of load includes: a motor for driving a load; an inverter for controlling the speed and the voltage of the motor; a sensor unit for measuring the magnetic flux maintaining current and the torque current of the motor; and a control unit determining the speed of the inverter and using the proportional value of the magnetic flux maintaining current and the torque current measured within a range in which the total current does not increase when the motor is driven at the determined speed. The motor inverter control system can control both motor speed and voltage to select the lowest frequency within the permissible range and at the same time control the voltage at the water head to maximize power, thereby reducing power consumption to a minimum.

Abstract: The present invention relates to a system for applying maximum driving efficiency point of load, comprising: a motor for driving a load; an inverter for controlling the speed and the voltage of the motor; a sensor unit for measuring the magnetic flux maintaining current and the torque current of the motor; and a control unit determining the speed of the inverter and using the proportional value of the magnetic flux maintaining current and the torque current measured within a range in which the total current does not increase when the motor is driven at the determined speed, or determining the optimum voltage of the inverter at the point where the power factor becomes maximum. The motor inverter control system as described above controls both motor speed and voltage to select the lowest frequency within the permissible range and at the same time control the voltage at the water head to maximize power, this can reduce power consumption to a minimum and reduce energy consumption to a maximum.

Abstract: The present invention provides a dimple structure for golf balls. In the present invention, a plurality of dimples (50a) each having a predetermined shape is disposed on an outer surface of a golf ball in a predetermined arrangement. The dimple structure of the present invention includes at least one protrusion (60a) which is integrally provided in the dimple (50a), thus increasing the contact area between the golf ball and the head of a golf club, and increasing resilient force of the golf ball against the golf club head, thereby increasing the distance that the golf ball is driven. As well, the present invention increases the amount of backspin on the golf ball when an approach shot is executed near the putting green, thus allowing the rolling action of the golf ball on the putting green to be easily controlled.