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公开(公告)号：US09954468B2
公开(公告)日：2018-04-24
申请号：US14081524
申请日：2013-11-15
Applicant: S-PRINTING SOLUTION CO., LTD.
Inventor： Hyoung-il Kim , Yong-ho You , Seong-ho Shin , Young Jung Yun , Tae-young Kim , Geon-hoon Kim , Ho-bin Hwang , Ji-young Byun
CPC classification number: H02P6/08 , H02P6/06 , H02P6/34 , H02P23/0004 , H02P23/22
Abstract: An image forming apparatus includes an engine unit to perform an image forming job; an engine control unit to control the operation of the engine unit; a brushless direct current (BLDC) motor to drive the engine unit; a sensor unit to sense electric angle information and driving velocity information of the BLDC motor; a communication interface to receive a digital control command with respect to the BLDC motor from the engine control unit; a driving signal unit to generate a driving signal to control the BLDC motor; and a digital control unit to control the operation of the driving signal unit in a digital phase locked loop (PLL) manner for feedback controls the BLDC motor, based on the received digital control command, the detected electric angle information and the driving velocity information and a digital gain value as a control factor with respect to the BLDC motor.
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公开(公告)号：US10171017B2
公开(公告)日：2019-01-01
申请号：US14177433
申请日：2014-02-11
Applicant: S-PRINTING SOLUTION CO., LTD.
Inventor： Yong-ho You , Hak-young Kim , Ji-young Byun , Sang-hyuk Jung , Ho-bin Hwang
Abstract: An image forming apparatus may include an engine portion used to perform an image forming job, a step motor configured to start the engine portion, a driver including a resistor that measures current that flows to a coil of the step motor and is configured to provide a predetermined constant current to the step motor, and a drive controller configured to measure a load level of the step motor based on a voltage value of the resistor and to control the driver to provide the constant current that corresponds to the measured load level.
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