Electromagnetic air brake for rotary machine - combines flat and plunger armature attraction effects with electromagnet excitation to brake shaft

摘要

A brake lifting electromagnet for rotary electrical machines has a magnetic iron core (1) with an embedded exciter coil (3) firmly fixed in the motor casing (6). The armature (2) revolves with the motor shaft (4) and is axially displaceable. A spring (5) moves the armature away when the electromagnet is de-energised and applies the friction brake. When the electromagnet is switched ON and pulls the armature up to a stop (7), the vertical faces cause an attraction by the flat armature principle, and the horizontal faces by the plunger armature principle. The result is a balanced force of attraction as a function of the stroke of 10-20 mm with reduced excitation power.