公开(公告)号：US11381180B2

公开(公告)日：2022-07-05

申请号：US16639650

申请日：2018-08-23

Applicant: LINAK A/S

Inventor： Jeppe Christian Bastholm ,  Christian Tjønelund Ahler

IPC: H02P3/12 ,  H02P7/03 ,  F16H25/20 ,  F16H25/24 ,  H02P3/04 ,  F16D121/24

Abstract: A linear actuator (1) comprises a spindle nut arranged to be moved between two end positions on a spindle driven by a DC motor (2). An end stop switch (31) is arranged to be activated when the spindle nut is in an end position. In its activated state, the end stop switch disconnects the motor current and connects a first diode (33) across the DC motor for short circuiting the motor when the current is interrupted. A second diode (32) is connected over the end stop switch for enabling the DC motor to drive the spindle nut out of said end position. An additional component (43) in series with the first diode reduces noise problems caused by motor current circulating through this diode during pulse pauses while the spindle nut is driven out of an end position by a pulse width modulated voltage via a cable from a control box.

公开(公告)号：US20200177112A1

公开(公告)日：2020-06-04

申请号：US16639650

申请日：2018-08-23

Applicant: LINAK A/S

Inventor： Jeppe Christian Bastholm ,  Christian Tjønelund Ahler

IPC: H02P3/12 ,  H02P3/04 ,  H02P7/03 ,  F16H25/20 ,  F16H25/24

Abstract: A linear actuator (1) comprises a spindle nut arranged to be moved between two end positions on a spindle driven by a DC motor (2). An end stop switch (31) is arranged to be activated when the spindle nut is in an end position. In its activated state, the end stop switch disconnects the motor current and connects a first diode (33) across the DC motor for short circuiting the motor when the current is interrupted. A second diode (32) is connected over the end stop switch for enabling the DC motor to drive the spindle nut out of said end position. An additional component (43) in series with the first diode reduces noise problems caused by motor current circulating through this diode during pulse pauses while the spindle nut is driven out of an end position by a pulse width modulated voltage via a cable from a control box.