Electromagnetic percussion appliance

Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control

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Details

310 30, 318114, 318132, H02K 3300

Patent

active

042152976

ABSTRACT:
An electromagnetic hammer has a coil coacting with an axially reciprocable armature including a ferromagnetic core traversed by an elongate nonmagnetic ram which carries at one end a spring-loaded piston head forming part of a pneumatic damping device, its other end co-operating with a working tool. The coil is intermittently energizable by a control system including a capacitor chargeable from an electric power supply by way of a first thyristor and dischargeable through the coil by way of a second thyristor, the two thyristors being sequentially triggered in response to a control pulse applied to a transformer with two secondaries generating staggered firing pulses with the aid of a delay network in the output circuit of one of these secondaries.

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patent: 4069444 (1978-01-01), Heim

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