公开(公告)号：EP1468432A1

公开(公告)日：2004-10-20

申请号：EP02806478.0

申请日：2002-12-20

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H01F7/06 ,  H02K41/02 ,  H02K41/035

CPC分类号： H01F7/066 ,  H02K11/00 ,  H02K41/0356

摘要： A linear voice coil actuator is disclosed which includes field subassemblies each including a field blank, and in which at least a one of the field subassemblies includes maghets of alternating polarity positioned on the field blank to form interleaved-magnetic circuits in a direction of motion of the linear voice coil actuator. The field subassemblies are positioned with respect to one another to form a gap between the field subassembly having the magnets, and another of the field subassemblies. Also included is a coil assembly that includes coils positioned in a plane within the gap, wherein the plane is substantially parallel to the direction of motion of the linear voice coil actuator. The field blanks include flux path sections which provide a flux path perpendicular to the direction of motion for each pair of magnets of opposite polarity that are separated by the gap, and which thereby results in the height of the actuator of the present invention being largely independent of the lengths of the magnets employed.

公开(公告)号：EP1485981A1

公开(公告)日：2004-12-15

申请号：EP02709628.8

申请日：2002-02-22

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K41/035

CPC分类号： H02K41/0356

摘要： A voice coil actuator is disclosed which provides a proportional solenoid type characteristic and in which first and second magnets are positioned at different ends of a first soft magnetic pole piece and magnetized in opposite directions, the first soft magnetic pole piece having a length greater than the length of the first magnet and the length of the second magnet. A coil having a length less than the lengths of the first soft magnetic pole piece is positioned for travel along an axis common to the first soft magnetic pole piece and first and second magnets, and a structure provides a magnetic path between free ends of the first and second magnets.

公开(公告)号：EP1430588A2

公开(公告)日：2004-06-23

申请号：EP02763626.5

申请日：2002-09-10

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K33/18

CPC分类号： H02K33/18

摘要： Disclosed is a linear voice coil actuator having a latching feature, the actuator having a coil assembly, a field assembly, a magnetic structure positioned in the coil assembly, and a stop which limits the position of the magnetic structure with respect to the field assembly when the coil is not energized. The coil assembly has a coil base and a coil located in a cavity in the coil base. The field assembly preferably has an axially magnetized cylindrical magnet, a soft pole piece, and a soft magnetic housing. Preferably the magnetic structure is a magnetic plate positioned coaxially with the axis of magnetization of the magnet and having a diameter or a thickness which is selected to set a latching force between the plate and the magnet when the coil is not energized.

公开(公告)号：EP1348250A2

公开(公告)日：2003-10-01

申请号：EP01988414.7

申请日：2001-12-21

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K41/035 ,  H02K29/03

CPC分类号： H02K41/031 ,  H01F7/066

摘要： A linear motion device is disclosed which includes an armature assembly, and a field assembly which includes a plurality of permanent magnets each having a length, and a plurality of permanent magnets and the length of the plurality of pole pieces is tailored to achieve a constant force versus stroke characteristic, when sinusoidal commutation is used.

公开(公告)号：EP1430588B1

公开(公告)日：2008-06-11

申请号：EP02763626.5

申请日：2002-09-10

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K33/18

CPC分类号： H02K33/18

摘要： Disclosed is a linear voice coil actuator having a latching feature, the actuator having a coil assembly, a field assembly, a magnetic structure positioned in the coil assembly, and a stop which limits the position of the magnetic structure with respect to the field assembly when the coil is not energized. The coil assembly has a coil base and a coil located in a cavity in the coil base. The field assembly preferably has an axially magnetized cylindrical magnet, a soft pole piece, and a soft magnetic housing. Preferably the magnetic structure is a magnetic plate positioned coaxially with the axis of magnetization of the magnet and having a diameter or a thickness which is selected to set a latching force between the plate and the magnet when the coil is not energized.

公开(公告)号：EP1269612A2

公开(公告)日：2003-01-02

申请号：EP01920809.9

申请日：2001-03-27

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K41/035

CPC分类号： H02K41/0356 ,  G11B21/083

摘要： An actuator is provided in which one or more separate compensating coils are employed to alter the distribution of the magnetic flux density in the air gap to produce a substantially constant force throughout the stroke; and in which current in the separate compensating coils can be adjusted with the stroke using separate power supplies and position feedback.

公开(公告)号：EP1380089A1

公开(公告)日：2004-01-14

申请号：EP02715264.4

申请日：2002-04-03

申请人： BEI Technologies, Inc.

发明人： GODKIN, Mikhail

IPC分类号： H02K3/493 ,  H02K41/03 ,  H02K1/18

CPC分类号： H02K41/031 ,  H02K1/18 ,  H02K3/493

摘要： A stack assembly (100) is disclosed of the type used in linear brushless DC motors, the stack assembly having a base portion (106), a plurality of teeth (102) extending from the base portion and about which the windings can be positioned, and in which the plurality of teeth are spaced apart from each other so as to define slot openings at ends of and between adjacent teeth, and magnetic material (112) shaped and positionable to enclose one or more of the slot openings between adjacent teeth. Also disclosed is a mounting bracket (120) positionable along the back iron of the stack assembly and shaped so that the ends of the mounting bracket (124) engage with the ends of the stack assembly.