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公开(公告)号：US20190229599A1
公开(公告)日：2019-07-25
申请号：US16252346
申请日：2019-01-18
发明人： Qian Xu , Shibo Chen
摘要： A power tool includes a motor, a first power source access circuit, a first drive circuit, a second power source access circuit and a second drive circuit. The motor includes a rotor, a stator, a plurality of first-type windings and a plurality of second-type windings. The rotor is configured to rotate about a central axis. The stator includes a ring-shaped yoke portion, and a plurality of teeth. The plurality of first-type windings are configured to be wound around part of the plurality of teeth and the plurality of second-type windings are configured to be wound around other part of the plurality of teeth. The first power source access circuit is configured to access a first power source with a first voltage. The first drive circuit includes a plurality of first-type electronic switches connected between the plurality of first-type windings and the first power source access circuit. The second power source access circuit is configured to access a second power source with a second voltage. The second drive circuit includes a plurality of second-type electronic switches connected between the plurality of second-type windings and the second power source access circuit. The plurality of first-type windings and the plurality of second-type windings are spaced in a circumferential direction of the central axis.
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公开(公告)号：US20180183302A1
公开(公告)日：2018-06-28
申请号：US15905028
申请日：2018-02-26
发明人： Shibo Chen , Hongwei Wang
摘要： An electric power tool and a method for driving a brushless motor in the electric power tool. The electric power tool includes a driving circuit for driving the brushless motor and position sensors (D1, D2, D3) for detecting positions of the rotor. The rotor of the brushless motor, when rotating in a normal direction, sequentially passes by a commutation position, where a signal of at least one of the position sensors (D1, D2, D3) in the brushless motor changes, and a reference position, where a back electromotive force of the stator winding of at least one phase in the brushless motor is at a midpoint position of the waveform of the back electromotive force. An electrical angle between the commutation position and the reference position ranges from 20° to 40°. The position sensors (D1, D2, D3) are configured such that performance of the brushless motor is improved.
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公开(公告)号：US10903730B2
公开(公告)日：2021-01-26
申请号：US16252346
申请日：2019-01-18
发明人： Qian Xu , Shibo Chen
摘要： A power tool includes a motor, a first power source access circuit, a first drive circuit, a second power source access circuit and a second drive circuit. The motor includes a rotor, a stator, a plurality of first-type windings and a plurality of second-type windings. The rotor is configured to rotate about a central axis. The stator includes a ring-shaped yoke portion, and a plurality of teeth. The plurality of first-type windings are configured to be wound around part of the plurality of teeth and the plurality of second-type windings are configured to be wound around other part of the plurality of teeth. The first power source access circuit is configured to access a first power source with a first voltage. The first drive circuit includes a plurality of first-type electronic switches connected between the plurality of first-type windings and the first power source access circuit. The second power source access circuit is configured to access a second power source with a second voltage. The second drive circuit includes a plurality of second-type electronic switches connected between the plurality of second-type windings and the second power source access circuit. The plurality of first-type windings and the plurality of second-type windings are spaced in a circumferential direction of the central axis.
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公开(公告)号：US10256701B2
公开(公告)日：2019-04-09
申请号：US15905028
申请日：2018-02-26
发明人： Shibo Chen , Hongwei Wang
摘要： An electric power tool and a method for driving a brushless motor in the electric power tool. The electric power tool includes a driving circuit for driving the brushless motor and position sensors (D1, D2, D3) for detecting positions of the rotor. The rotor of the brushless motor, when rotating in a normal direction, sequentially passes by a commutation position, where a signal of at least one of the position sensors (D1, D2, D3) in the brushless motor changes, and a reference position, where a back electromotive force of the stator winding of at least one phase in the brushless motor is at a midpoint position of the waveform of the back electromotive force. An electrical angle between the commutation position and the reference position ranges from 20° to 40°. The position sensors (D1, D2, D3) are configured such that performance of the brushless motor is improved.
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公开(公告)号：US20180076676A1
公开(公告)日：2018-03-15
申请号：US15686601
申请日：2017-08-25
发明人： Shibo Chen , Qian Xu
IPC分类号： H02K1/27
CPC分类号： H02K1/276 , H02K1/2766 , H02K2201/03 , H02K2213/03
摘要： A rotor lamination assembly is formed with a central hole wherein a central axis goes through the central hole. The rotor lamination assembly is further formed with an even number of mounting holes arranged between a rim of the central hole and an outer rim of the rotor lamination assembly. The outer rim of the rotor lamination assembly has a projection on a plane substantially perpendicular to the central axis. The projection includes an even number of base curve edges, an even number of protruding curve edges, and connecting curve edges. Each protruding curve edge is arranged between two adjacent base curve edges in a circumferential direction of the central axis. The protruding curve edges and the base curve edges are connected with each other through the connecting curve edges. Every two mounting holes which are arranged symmetrically constitute a mounting hole group. A supporting portion is disposed between the two mounting holes and corresponded with the base curve edge in the circumferential direction of the central axis. Edges of the two mounting holes of the mounting hole group which are farthest from each other are respectively corresponded with the two adjacent protruding curve edges in the circumferential direction of the central axis.
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公开(公告)号：US11165295B2
公开(公告)日：2021-11-02
申请号：US16809233
申请日：2020-03-04
发明人： Shibo Chen , Qian Xu
IPC分类号： H02K1/27
摘要： A rotor lamination assembly is formed with a central hole wherein a central axis goes through the central hole. The rotor lamination assembly is further formed with an even number of mounting holes arranged between a rim of the central hole and an outer rim of the rotor lamination assembly. The outer rim of the rotor lamination assembly has a projection on a plane substantially perpendicular to the central axis. The projection includes an even number of base curve edges, an even number of protruding curve edges, and connecting curve edges. Each protruding curve edge is arranged between two adjacent base curve edges in a circumferential direction of the central axis. The protruding curve edges and the base curve edges are connected with each other through the connecting curve edges. Every two mounting holes which are arranged symmetrically constitute a mounting hole group. A supporting portion is disposed between the two mounting holes and corresponded with the base curve edge in the circumferential direction of the central axis. Edges of the two mounting holes of the mounting hole group which are farthest from each other are respectively corresponded with the two adjacent protruding curve edges in the circumferential direction of the central axis.
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公开(公告)号：US20170001251A1
公开(公告)日：2017-01-05
申请号：US15190872
申请日：2016-06-23
申请人： CHERVON (HK) LIMITED
发明人： Shibo Chen , Xiangqing Fu , Hongwei Wang
摘要： A cutting machine includes a cutting element for cutting material, a motor for driving the cutting element to rotate and a housing for containing the motor. The motor includes a rotor sleeve being formed with a receiving chamber, a motor shaft being capable of rotating together with the rotor sleeve, a stator core at least partially contained in the receiving chamber, stator coils wound around the stator core, and a stator bracket for fixing the stator core. The stator core is formed with a through hole for the motor shaft to pass there through, the stator coils are located outside the through hole and, the motor shaft is capable of rotating relative to the stator core.
摘要翻译： 切割机包括用于切割材料的切割元件，用于驱动切割元件旋转的马达和用于容纳马达的壳体。 所述电动机包括转子套筒，所述转子套筒形成有接纳室，能够与所述转子套筒一起旋转的电动机轴，至少部分地容纳在所述容纳室中的定子铁芯，缠绕在所述定子铁芯上的定子线圈和定子支架 用于固定定子芯。 定子铁芯形成有用于电机轴通过的通孔，定子线圈位于通孔的外侧，电机轴能够相对于定子铁心旋转。
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公开(公告)号：US09937570B2
公开(公告)日：2018-04-10
申请号：US15190872
申请日：2016-06-23
申请人： CHERVON (HK) LIMITED
发明人： Shibo Chen , Xiangqing Fu , Hongwei Wang
摘要： A cutting machine includes a cutting element for cutting material, a motor for driving the cutting element to rotate and a housing for containing the motor. The motor includes a rotor sleeve being formed with a receiving chamber, a motor shaft being capable of rotating together with the rotor sleeve, a stator core at least partially contained in the receiving chamber, stator coils wound around the stator core, and a stator bracket for fixing the stator core. The stator core is formed with a through hole for the motor shaft to pass there through, the stator coils are located outside the through hole and, the motor shaft is capable of rotating relative to the stator core.
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公开(公告)号：US20170155261A1
公开(公告)日：2017-06-01
申请号：US15358578
申请日：2016-11-22
申请人： CHERVON (HK) LIMITED
发明人： Shibo Chen , Zhuo Wang , Liang Chen
IPC分类号： H02J7/00
CPC分类号： H02J7/0029 , H01M10/448 , H01M10/482 , H01M10/486 , H02J7/0063 , H02J7/007 , H02J7/0091 , H02J2007/004 , H02J2007/0067
摘要： A method is provided for protecting a battery pack. The method includes discharging the battery pack, detecting the temperature T of the battery pack, detecting the discharge current I of the battery pack, detecting the discharge voltage U1 of the battery pack, obtaining an internal resistance R according to the temperature T or the discharge voltage U1, calculating a capacity voltage U2 according to an equation U2=U1+IR, and determining whether the capacity voltage U2 is less than a preset threshold and, if yes, limiting discharging.
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