US 10,927,907 B2Granted

Control method of an electromagnetic brake with a controllable armature disc movement

AssigneeChr. Mayr GmbH & Co. KG

InventorsKarl Unsin, Mathias Kramkowski, Rudolf Rädel

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Abstract

A method for controlling an electromagnetic brake (1) having a coil carrier (2), a solenoid (5), an armature disc (7), and at least one further force-exerting element. The internal and external poles (3, 4) of the coil carrier each have a front surface with a varying gradient that fits, in a complementary fashion, the front surfaces of the respective internal and external poles (8, 9) of the armature disc. The brake has an air gap (11) which varies in size and forms a stroke region (21). When excitation occurs, the solenoid generates a magnetic force, and the force-exerting element generates an opposing force, wherein the ratio of the solenoid's magnetic force and the opposing force varies at least once between greater than and smaller than one during the movement of the armature disc in the stroke region owing to the variation of the excitation of the solenoid.

Claims34

Dependent claims

Method for controlling an electromagnetically released brake comprising a coil carrier having an internal pole and an external pole, a solenoid, an armature disk having an internal pole and an external pole, and at least one further force-exerting element, wherein:

the internal pole and the external pole of the coil carrier each have a front surface with a varying gradient;
front surfaces of the internal pole and the external pole of the armature disk each fit, in a complementary fashion, the front surfaces of the respective internal pole and external pole of the coil carrier;
the coil carrier and the armature disk define an air gap which varies in size and forms a stroke region between a basic air gap and a rated air gap;
and
the method comprises:
the solenoid generating a magnetic force upon excitation;
and
the force-exerting element generating a second force opposite the magnetic force of the solenoid, wherein:
the ratio of the magnetic force of the solenoid and the second force of the force-exerting element during the movement of the armature disk in the stroke region varies at least once between greater than one and less than one due to an appropriate excitation of the solenoid;
and
during the movement of the armature disk in the stroke region, the ratio between the magnetic force of the solenoid and the second force of the force-exerting element varies between greater than one, less than one, and equal to one due to a suitable excitation of the solenoid so that a variable force is applied to the armature disk.

8 more elements

the internal pole and the external pole of the coil carrier each have a front surface with a varying gradient;
front surfaces of the internal pole and the external pole of the armature disk each fit, in a complementary fashion, the front surfaces of the respective internal pole and external pole of the coil carrier;
the coil carrier and the armature disk define an air gap which varies in size and forms a stroke region between a basic air gap and a rated air gap;
and
the method comprises:
the solenoid generating a magnetic force upon excitation;
and
the force-exerting element generating a second force opposite the magnetic force of the solenoid, wherein:
the ratio of the magnetic force of the solenoid and the second force of the force-exerting element during the movement of the armature disk in the stroke region varies at least once between greater than one and less than one due to an appropriate excitation of the solenoid;
when opening the brake by suitable excitation of the solenoid, a magnetic force is generated so that the ratio of the magnetic force of the solenoid and the second force of the force-exerting element becomes greater than one, and the armature disk is accelerated from the rated air gap in the opening direction;
the excitation of the solenoid is further increased during the movement of the armature disk in the stroke region, and the ratio of the magnetic force of the solenoid and the second force of the force-exerting element is at least once less than one, and the armature disk is decelerated at least once and reaches the basic air gap at an adjustable speed;
the excitation of the solenoid is further increased so that the ratio of the magnetic force of the solenoid and the second force of the force-exerting element after the end of the movement is again greater than one;
when the brake is closed by varying the excitation of the solenoid, the magnetic force is reduced so that the ratio of the magnetic force of the solenoid and the second force of the force-exerting element becomes less than one, and the armature disk is accelerated from the basic air gap in the closing direction;
the excitation of the solenoid is further reduced during the movement of the armature disk in the stroke region, and the ratio of the magnetic force of the solenoid and the second force of the force-exerting element is at least once greater than one, and the armature disk is decelerated at least once, and the armature disk reaches the rated air gap at an adjustable speed;
and
the excitation of the solenoid is further reduced until the ratio of the magnetic force and the second force of the force-exerting element is close to zero.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/336,214Filed 18 Sep 2017
Priority: DE 10 2016 119 027.67 Oct 2016
Published: US 2019/0226537 A125 Jul 2019
Granted: 23 Feb 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

F16D 59/02
Self-acting brakes, e.g. coming into operation at a predetermined speed: spring-loaded and adapted to be released by mechanical, fluid, or…
B60T 13/04
With mechanical assistance or drive: by spring or weight
B60T 13/748
With electrical assistance or drive: acting on electro-magnetic brakes
F16D 55/16
With self-tightening action, e.g. by means of coacting helical surfaces or balls and inclined surfaces: mechanically-actuated brakes