Patents Assigned to The Department of Electrical Engineering, National Chang-Hua University of Education
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Patent number: 8845247Abstract: A milling machine has a base, a work platform mounted movably on the base, and a ruler mounted on the work platform. The work platform is movable relative to a base axis. The thermal compensation system includes a sensor and a control unit. The sensor is configured to be mounted on the base for sensing a position of each of the work platform and the ruler relative to the base axis. The control unit is coupled to the sensor, and determines a work platform displacement and a ruler displacement according to the positions sensed by the sensor. The control unit further calculates a compensation value based on the work platform displacement and the ruler displacement. The control unit is configured to correct the position of the work platform relative to the base axis according to the compensation value.Type: GrantFiled: June 28, 2011Date of Patent: September 30, 2014Assignees: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Ching-Wei Wu, Ying-Shing Shiao, Chia-Hui Tang, Yu-Che Wang, Paul Chang
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Patent number: 8770901Abstract: A spindle control system for a milling machine is provided. The milling machine includes a column, an overarm, a spindle for mounting a cutter, a first motor mounted on the column for driving movement of the overarm, and a second motor mounted on the overarm for driving rotation of the spindle. The spindle control system includes a distance sensor and a temperature sensor, each to be mounted on the overarm and to be disposed proximate to the end portion of the spindle. The spindle control system further includes a central control unit for determining a compensation parameter based on the displacement sensed by the distance sensor and the temperature sensed by the temperature sensor, and for controlling movement of the overarm by the first motor through a compensation distance based on the compensation parameter to compensate for at least one of the cutter deformation and the spindle deformation.Type: GrantFiled: May 18, 2011Date of Patent: July 8, 2014Assignees: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Chia-Hui Tang, Yu-Lin Juan, Jin-Jia Chen, Tsair-Rong Chen, Paul Chang
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Patent number: 8653765Abstract: In a method and module for controlling rotation of a motorized spindle driven by a driving unit, a sensing unit senses vibration of the spindle and generates a voltage signal corresponding to the vibration of the spindle. A processing unit receives the voltage signal from the sensing unit, generates an adjusting ratio equal to a reference voltage corresponding to a predetermined vibration level of the spindle by the voltage signal upon detecting that the voltage signal is greater than the reference voltage and is less than a predetermined threshold voltage that is greater than the reference voltage, and outputs a control signal corresponding to the adjusting ratio to the driving unit such that the driving unit reduces a rotation speed of the spindle by the adjusting ratio in response to the control signal from the processing unit.Type: GrantFiled: July 29, 2011Date of Patent: February 18, 2014Assignees: Buffalo Machinery Co., Ltd, The Department of Electrical Engineering National Chang-Hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Chin-Sheng Lu
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Patent number: 8598827Abstract: A control system of a milling machine is disclosed. The milling machine has an overarm, a spindle connected to a cutter, a spindle motor, and an X-axis motor, a Y-axis motor and a Z-axis motor. The control system includes a vibration sensor for detecting a vibration level of the spindle. The control system also includes a central control unit configured to adjust a rotation speed of at least one of the X-axis motor, the Y-axis motor, and the Z-axis motor to bring a load current of at least one of the motors to be within a corresponding current range, and configured to adjust a rotation speed of the spindle motor to bring the vibration level to be within a vibration range.Type: GrantFiled: June 2, 2011Date of Patent: December 3, 2013Assignees: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Chia-Hui Tang, Chau-Shing Wang, Yu-Lin Juan, Tsair-Rong Chen, Paul Chang
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Publication number: 20130265411Abstract: A system for inspecting a scraped surface of a workpiece performs steps of: a) capturing an image of the scraped surface to obtain a original image section; b) removing high point regions whose areas are outside of a predetermined area range to obtain a base image; c) processing pixels of the base image using a first imaging mask to generate a judgment image; d) determining whether uniformity of the high point regions in the base image conforms a standard; e) determining whether a number of the high point regions in the base image falls within a predetermined number range; and f) evaluating whether or not a portion of the scraped surface conforms with the standard based on results of determinations made in steps d) and e).Type: ApplicationFiled: April 9, 2012Publication date: October 10, 2013Applicants: The Department of Electrical Engineering, National Chang-Hua University of Education, Buffalo Machinery Company LimitedInventors: Ching-Wei Wu, Ying-Shing Shiao, Chia-Hui Tang, Paul Chang
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Publication number: 20130004256Abstract: A milling machine has a base, a work platform mounted movably on the base, and a ruler mounted on the work platform. The work platform is movable relative to a base axis. The thermal compensation system includes a sensor and a control unit. The sensor is configured to be mounted on the base for sensing a position of each of the work platform and the ruler relative to the base axis. The control unit is coupled to the sensor, and determines a work platform displacement and a ruler displacement according to the positions sensed by the sensor. The control unit further calculates a compensation value based on the work platform displacement and the ruler displacement. The control unit is configured to correct the position of the work platform relative to the base axis according to the compensation value.Type: ApplicationFiled: June 28, 2011Publication date: January 3, 2013Applicants: The Department of Electrical Engineering, National Chang-Hua University of Education, BUFFALO MACHINERY COMPANY LIMITEDInventors: Ching-Wei WU, Ying-Shing SHIAO, Chia-Hui TANG, Yu-Che WANG, Paul CHANG
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Publication number: 20120321406Abstract: A milling machine has a carriage, a main spindle seat extending along an axis, and a motor operable to drive displacement of the main spindle seat relative to the carriage along the axis. A deflection correction system includes a control unit, a displacement sensor, at least one pressure cylinder, and a pressure sensor. The pressure cylinder includes a cylinder body, and a control rod extended retractably into the cylinder body. The control unit is configured to determine a pressure range as a function of displacement detected by the displacement sensor, and to maintain fluid pressure in the pressure cylinder within a pressure range, thereby controlling the control rod via the cylinder body to position the second end portion of the main spindle seat relative to the axis.Type: ApplicationFiled: June 14, 2011Publication date: December 20, 2012Applicants: The Department of Electrical Engineering National Chang-Hua University of Education, BUFFALO MACHINERY COMPANY LIMITEDInventors: Kun-Fang HUANG, Tsair-Rong CHEN, Chia-Hui TANG, Wen-Ren YANG, Paul CHANG
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Publication number: 20120306420Abstract: A control system of a milling machine is disclosed. The milling machine has an overarm, a spindle connected to a cutter, a spindle motor, and an X-axis motor, a Y-axis motor and a Z-axis motor. The control system includes a vibration sensor for detecting a vibration level of the spindle. The control system also includes a central control unit configured to adjust a rotation speed of at least one of the X-axis motor, the Y-axis motor, and the Z-axis motor to bring a load current of at least one of the motors to be within a corresponding current range, and configured to adjust a rotation speed of the spindle motor to bring the vibration level to be within a vibration range.Type: ApplicationFiled: June 2, 2011Publication date: December 6, 2012Applicants: THE DEPARTMENT OF ELECTRICAL ENGINEERING, NATIONAL CHANG-HUA UNIVERSITY OF EDUCATION, BUFFALO MACHINERY COMPANY LIMITEDInventors: Chia-Hui TANG, Chau-Shing WANG, Yu-Lin JUAN, Tsair-Rong CHEN, Paul CHANG
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Publication number: 20120294688Abstract: A spindle control system for a milling machine is provided. The milling machine includes a column, an overarm, a spindle for mounting a cutter, a first motor mounted on the column for driving movement of the overarm, and a second motor mounted on the overarm for driving rotation of the spindle. The spindle control system includes a distance sensor and a temperature sensor, each to be mounted on the overarm and to be disposed proximate to the end portion of the spindle. The spindle control system further includes a central control unit for determining a compensation parameter based on the displacement sensed by the distance sensor and the temperature sensed by the temperature sensor, and for controlling movement of the overarm by the first motor through a compensation distance based on the compensation parameter to compensate for at least one of the cutter deformation and the spindle deformation.Type: ApplicationFiled: May 18, 2011Publication date: November 22, 2012Applicants: THE DEPARTMENT OF ELECTRICAL ENGINEERING, NATIONAL CHANG-HUA UNIVERSITY OF EDUCATION, BUFFALO MACHINERY COMPANY LIMITEDInventors: Chia-Hui TANG, Yu-Lin JUAN, Jin-Jia CHEN, Tsair-Rong CHEN, Paul CHANG
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Patent number: 8210781Abstract: A processing machine includes a machine bed, a spindle seat, a sliding rail unit, and a driving unit. The sliding rail unit is disposed between the machine bed and the spindle seat. The driving unit is used for driving the spindle seat to move within a slot in the machine bed, and includes a threaded rod journalled on a junction between a bottom wall surface and a lateral wall surface of the machine bed, and a nut member disposed fixedly on a junction between a bottom surface and a lateral side surface of the spindle seat and engaging the threaded rod.Type: GrantFiled: November 12, 2008Date of Patent: July 3, 2012Assignees: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Yuan-Fu Tsai
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Patent number: 8188822Abstract: A cooling system includes a housing having a compartment and an oil inlet. A transformer unit is disposed in the compartment and includes a plurality of large power transformers. A heat-dissipating unit is disposed in the compartment and includes a fluid inlet port member, a fluid outlet port member, a heat conductor, and a plurality of heat exchange pipes. The heat conductor is in thermal contact with the heat exchange pipes. The heat exchange pipes are arranged along a first direction. Each of the heat exchange pipes extends along a plane that is not parallel to the first direction. A cooling oil is introduced into the compartment through the oil inlet such that the transformer unit, the heat conductor, and the heat exchange pipes are immersed in the cooling oil.Type: GrantFiled: July 7, 2009Date of Patent: May 29, 2012Assignees: The Department of Electrical Engineering, National Chang-Hua University of Education University of TaiwanInventors: Kuen-Cheng Wang, Tsair-Rong Chen, Jeen-Sheen Row
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Publication number: 20110279075Abstract: In a method and module for controlling rotation of a motorized spindle driven by a driving unit, a sensing unit senses vibration of the spindle and generates a voltage signal corresponding to the vibration of the spindle. A processing unit receives the voltage signal from the sensing unit, generates an adjusting ratio equal to a reference voltage corresponding to a predetermined vibration level of the spindle by the voltage signal upon detecting that the voltage signal is greater than the reference voltage and is less than a predetermined threshold voltage that is greater than the reference voltage, and outputs a control signal corresponding to the adjusting ratio to the driving unit such that the driving unit reduces a rotation speed of the spindle by the adjusting ratio in response to the control signal from the processing unit.Type: ApplicationFiled: July 29, 2011Publication date: November 17, 2011Applicants: The Department of Electrical Engineering National Chang-Hua University of Education, Buffalo Machinery Company LimitedInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Chin-Sheng Lu
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Patent number: 7804689Abstract: A high-power thyristor module includes a housing configured with an inner receiving space, and a thyristor unit disposed in the inner receiving space in the housing and including a mounting frame, and a plurality of high-power thyristors mounted on the mounting frame. Each thyristor has a gate. The mounting frame includes a dielectric top plate disposed on a top side of the housing, and a plurality of electrodes mounted on the top plate so that the electrodes are exposed outwardly of the housing, and coupled respectively to the gates of the thyristors. Cooling oil is contained in the inner receiving space so that the thyristors are submerged thereby.Type: GrantFiled: November 4, 2008Date of Patent: September 28, 2010Assignees: Kuen-Cheng Wang, The Department of Electrical Engineering National Chang-Hua University of EducationInventors: Kuen-Cheng Wang, Tsair-Rong Chen, Jeen-Sheen Row
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Publication number: 20100119319Abstract: A processing machine includes a machine bed, a spindle seat, a sliding rail unit, and a driving unit. The sliding rail unit is disposed between the machine bed and the spindle seat. The driving unit is used for driving the spindle seat to move within a slot in the machine bed, and includes a threaded rod journalled on a junction between a bottom wall surface and a lateral wall surface of the machine bed, and a nut member disposed fixedly on a junction between a bottom surface and a lateral side surface of the spindle seat and engaging the threaded rod.Type: ApplicationFiled: November 12, 2008Publication date: May 13, 2010Applicants: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Yuan-Fu Tsai
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Publication number: 20100066291Abstract: In a method and module for controlling rotation of a motorized spindle driven by a driving unit, a sensing unit is adapted for sensing vibration of the spindle and generates a voltage signal corresponding to the vibration of the spindle. A processing unit is coupled to the sensing unit for receiving the voltage signal therefrom, and outputs a control signal corresponding to the voltage signal upon detecting that the voltage signal is greater than a reference voltage corresponding to a predetermined vibration level of the spindle, such that the driving unit adjusts a rotation speed of the spindle in response to the control signal from the processing unit.Type: ApplicationFiled: September 18, 2008Publication date: March 18, 2010Applicants: Buffalo Machinery Co., Ltd., Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Chin-Sheng Lu
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Publication number: 20100013492Abstract: A storage battery inspecting system includes a power supply unit and an inspecting unit. The inspecting unit includes two inspecting terminals to be connected to a battery soldering spot so as to detect response of the soldering spot to application of a test power signal by the power supply unit, and a control module for determining if a detected response of the soldering spot falls within a predetermined range configured in the control module, generating an indication signal if the detected response falls outside the predetermined range, and generating an inspection result corresponding to the detected response. The inspecting unit further includes an indication interface for outputting the indication signal, a transmission interface permitting supply of the inspection result to a processing device, and a control interface permitting supply of a control signal generated by the control module to a peripheral device for controlling operation of the peripheral device based on the detected response.Type: ApplicationFiled: September 23, 2009Publication date: January 21, 2010Applicants: The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Kuen-Cheng WANG, Tsair-Rong CHEN, Jeen-Sheen ROW
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Publication number: 20090284922Abstract: A high-power thyristor module includes a housing configured with an inner receiving space, and a thyristor unit disposed in the inner receiving space in the housing and including a mounting frame, and a plurality of high-power thyristors mounted on the mounting frame. Each thyristor has a gate. The mounting frame includes a dielectric top plate disposed on a top side of the housing, and a plurality of electrodes mounted on the top plate so that the electrodes are exposed outwardly of the housing, and coupled respectively to the gates of the thyristors. Cooling oil is contained in the inner receiving space so that the thyristors are submerged thereby.Type: ApplicationFiled: November 4, 2008Publication date: November 19, 2009Applicants: The Department of Electrical Engineering, National Chang-hua University of EducationInventors: Kuen-Cheng WANG, Tsair-Rong CHEN, Jeen-Sheen ROW
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Publication number: 20090245961Abstract: A machining apparatus includes a support frame, first and second workbenches, and a tool-mounting unit. The support frame includes a first horizontal frame part, and a second horizontal frame part disposed above the first horizontal frame part. The first and second workbenches are mounted slidably on the first horizontal frame part of the support frame, and is slidable relative to the support frame in a first horizontal direction. The tool-mounting unit is mounted slidably on the second horizontal frame part of the support frame, and is slidable relative to the support frame in a second horizontal direction transverse to the first horizontal direction.Type: ApplicationFiled: April 1, 2008Publication date: October 1, 2009Applicants: Buffalo Machinery Co., Ltd., The Department of Electrical Engineering National Chang-Hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Yuan-Fu Tsai
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Publication number: 20090160456Abstract: A device for inspecting a soldering spot in a storage battery includes a power supply unit and an inspecting unit. The power supply unit outputs a test power signal to be applied to the soldering spot. The inspecting unit includes first and second inspecting terminals, and a control module. The first and second inspecting terminals are adapted to be connected electrically to the soldering spot so as to detect response of the soldering spot to application of the test power signal by the power supply unit. The control module determines if a detected response of the soldering spot as detected through the first and second inspecting terminals falls within a predetermined range configured in the control module, generates an indication signal if the detected response falls outside the predetermined range, and generates an inspection result corresponding to the detected response.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Applicants: Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Kuen-Cheng Wang, Tsair-Rong Chen, Jeen-Sheen Row
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Patent number: 7475463Abstract: A cutting machine includes: a machine body; a hollow piston; a first shaft extending into the piston, co-movable with the piston relative to the machine body along a first axis, and rotatable about the first axis relative to the piston; a second shaft rotatable about a second axis and coupled to the first shaft when the first shaft is disposed at a first axial position; a rotary cutter holder rotatable about the first axis and coupled to the second shaft; a third shaft rotatable about the first axis and coupled to the first shaft when the first shaft is disposed at a second axial position; and a driving unit for driving rotation of the first shaft about the first axis.Type: GrantFiled: April 3, 2008Date of Patent: January 13, 2009Assignees: Buffalo Machinery Co., Ltd., The Department of Electrical Engineering, National Chang-Hua University of EducationInventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Yuan-Fu Tsai