Abstract: A safety mounting device includes two movable members mounted within a housing, the second movable member being sandwiched between the first movable member and a stop member and the first movable member being biased against the second movable member. Both movable members are movable along the longitudinal axis of the housing with the second movable member also being capable of tilting with respect to that longitudinal axis and rotating with respect to that longitudinal axis. The engagement between the two movable members is of a cam surface-cam follower nature. Movement of the second movable member along the longitudinal axis towards the first movable member, rotation of the second movable member from its home position and tilting of the second movable member relative to the longitudinal axis all cause the first movable member to be displaced from its home position along the longitudinal axis. This displacement can be used to trigger a switch for control purposes.

Abstract: A hybrid inverter for a slip energy recovery system for a wound rotor motor employs six thyristors (for 3 phase operation) or equivalent devices. Three of these are operated continuously in the inversion mode, the other three being operated from zero degrees to 180 degrees. The result is that a characteristic that is identical to a semi-converter is obtained except in the inversion mode. The hybrid inverter produces zero quadrature current at the full speed of the wound rotor motor and, as desired, zero volts at maximum current and maximum volts at zero current.