Abstract: A motor-driving apparatus for driving a motor having a plurality of windings respectively corresponding to a plurality of phases is provided. The motor-driving apparatus includes a first inverter having a plurality of first switching devices and connected to first ends of the plurality of windings and a second inverter having a plurality of second switching devices and connected to second ends of the plurality of windings. A third switching device is configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio. A controller is configured to adjust an on/off state of the first to third switching devices based on required output of the motor.

Abstract: Provided is a picker for use in a handler, including at least one picker base, a row of nozzles provided to each of the picker base, and a detecting unit, provided to one side of each of the nozzle, for detecting if a packaged chip exists in a carrying hole on a user tray. The picker is capable of detecting if the packaged chip exists in a first row of the carrying holes on the user tray. And the picker is capable of placing the packaged chips into the first row of the carrying holes on the user tray and at the same time detecting if the packaged chip exists in a second row of the carrying holes on the user tray, when existence of the packaged chip is not detected on the first row of the carrying holes on the user tray.