Valve actuator, valve and method for controlling a valve actuator

Patent metadata

Field	Value
Publication number	US-2016169409-A1
Application number	US-201514749711-A
Country	US
Kind code	A1
Filing date	Jun 25, 2015
Priority date	Jun 25, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A valve actuator for a valve has an electric motor which comprises a rotor and a stator, and further a magnetic detent brake with at least one detent magnet for holding the rotor in a detent position. The least one rotor magnet is arranged on the rotor and co-operates with the detent brake.

First claim

1 . A valve actuator for a valve, having an electric motor which comprises a rotor and a stator, and further having a magnetic detent brake with at least one detent magnet for holding said rotor in a detent position, wherein said least one rotor magnet is arranged said the rotor and co-operates with said detent brake.

2 . The valve actuator of claim 1 wherein said detent brake comprises a permanent magnet.

3 . The valve actuator of claim 1 wherein said detent brake forms a magnetic circuit with said stator.

4 . The valve actuator of claim 3 wherein said detent brake includes a permanent magnet and said permanent magnet forms said magnetic circuit.

5 . The valve actuator of claim 1 wherein said detent magnet has a magnetic strength such that said stator achieves a saturation magnetisation.

6 . The valve actuator of claim 1 wherein said at least one detent magnet is associated with a side surface of said stator.

7 . The valve actuator of claim 5 wherein at least one recess is provided on a side of said stator with which said detent magnet is associated.

8 . The valve actuator of claim 7 wherein said recess is a through-going slot.

9 . The valve actuator of claim 1 wherein said detent brake comprises two of said detent magnets which are arranged on opposite sides of said stator.

10 . The valve actuator of claim 1 wherein said detent brake includes at least one flux-conducting element.

11 . The valve actuator of claim 1 wherein said flux-conducting element is a pole shoe.

12 . A valve having a valve actuator, said valve actuator having an electric motor which comprises a rotor and a stator, and further having a magnetic detent brake with at least one detent magnet for holding said rotor in a detent position, wherein said least one rotor magnet is arranged said the rotor and co-operates with said detent brake.

13 . A method for controlling a valve actuator for a valve comprising an electric motor and a magnetic detent brake, said electric motor being controlled or regulated upon start-up such that said electric motor generates at least one magnetic field which weakens a magnetic field generated by said magnetic detent brake.

14 . The method of claim 13 wherein said magnetic field of said detent brake is an additional magnetic field.

Assignees

• Buerkert Werke Gmbh

Inventors

• Beck Klaus

Classifications

• F16K35/16 Primary

  with locking member actuated by magnet · CPC title

• F16K31/08

  using a permanent magnet · CPC title

• F16K31/04

  using a motor · CPC title

• F16K31/046 Primary

  with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor (F16K31/041 takes precedence) · CPC title

• H02K7/106 Primary

  with dynamo-electric brakes · CPC title