GB1368078A - Electromagnetic torquetransmitting coupling - Google Patents

Abstract

1368078 Cooling electromagnetic couplings REDMAN HEENAN FROUDE Ltd 1 Sept 1971 [4 Sept 1970] 40786/71 Heading H2A An electromagnetic torque-transmitting coupling 10 comprises a housing 20 defining a cylindrical chamber 54 containing concentrically two mutually magnetically interacting rotors 18, 28 respectively attached to shafts 14, 12 projecting from opposite end walls 78, 76 of the housing, the outer rotor 28 having annular grooves 48 and both rotors being positioned in one end of the chamber 54 the other end of which has means for supplying it with coolant air at above atmospheric pressure so that part of the air can circulate through openings 94, 98 in the rotors; the housing has around the rotor grooved surface mutually alternating circumferentially arranged air pressure and venting boxes 66, 60 formed between radially inwardly extending baffle plates 56 projecting from the housing inner wall to a position close to the rotor grooved surface, the pressure boxes 66 communicating at one set of ends with the chamber other end and the ventilating boxes 60 providing outlets extending through the housing 20 to atmosphere and being arranged to receive air which flows via the rotor grooves 48 from the pressure boxes 66 and also the air which has been circulated through the rotor openings 94, 98. The means may comprise an air blower or compressor disposed outside the housing and communicating with the chamber 54 via an opening 74 having movable louvres 72. End baffle plates 104 spanning alternate pairs of baffle plates 56 provide end walls to the venting boxes. The outer rotor 28 may have fins 108 to assist the air flow. Either shaft 12, 14, may be the driving, or driven, shaft.