US 11,869,713 B2
Preventive function control in an electromagnetic spring pressure brake
Harald Heumoos, Dietmannsried (DE); Matthias Kramkowski, Steingaden (DE); Andreas Marten, Baisweil (DE); Frank Timmler, Wiedergeltingen (DE); and Karl Unsin, Beckstetten (DE)
Assigned to Chr. Mayr GmbH + Co. KG, Mauerstetten (DE)
Appl. No. 17/276,702
Filed by Chr. Mayr GmbH + Co. KG, Mauerstetten (DE)
PCT Filed Sep. 27, 2019, PCT No. PCT/EP2019/076224
§ 371(c)(1), (2) Date Mar. 16, 2021,
PCT Pub. No. WO2020/070010, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 18198832 (EP), filed on Oct. 5, 2018.
Prior Publication US 2022/0025945 A1, Jan. 27, 2022
Int. Cl. F16D 66/00 (2006.01); H01F 7/18 (2006.01); B60T 17/22 (2006.01); F16D 121/22 (2012.01)
CPC H01F 7/1844 (2013.01) [B60T 17/22 (2013.01); F16D 2121/22 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for preventive function control of at least one electromagnetic spring-loaded brake, which at least:
comprises a coil, as well as
an armature disk;
a coil carrier with compression springs distributed thereon;
a control module; and
a monitoring module with at least:
a semiconductor component,
a current measuring device, and
a voltage measuring device;
wherein the method includes:
(i) controlling the spring-loaded brake with a voltage by the control module;
(ii) measuring state variables current (I) and voltage (U) at the electromagnetic spring-loaded brake by the monitoring module;
(iii) determining a parameter (T; F) during the control of the electromagnetic spring-loaded brake by the control module;
(iv) integrating the parameter (T; F) over a first range of the parameter (T; F) which extends from a starting point of the control to a point (W) at which the armature disk begins to move;
(v) detecting a current value at the point (W) at which the armature disk begins to move;
(vi) integrating the parameter (T; F) over a second range of the parameter (T; F) which extends from the starting point of the control when the current (I) again reaches the current value at the point (W) to a point at which a constant current is achieved;
(vii) calculating a ratio (X) from the integral of the parameter (T; F) over the first range to the integral of the parameter over the first and second ranges; and
(viii) outputting a status signal upon a value of the ratio (X) reaching or exceeding a predetermined value (Y).