Abstract: A stator wedge assembly provides a spring force to assist in retaining a conductor securely in a slot, without requiring a separate spring. Two ends of the assembly are received in a dove-tail at the mouth of a slot. A central spring section extends between the two ends and is slightly narrower than the walls at the mouth of the slot, so that it is free to flex. The central part of the central spring section has an increased thickness extending towards the conductor in the slot. At least one wedge is inserted, to press against the conductor in the slot on one side and to press against at least one of the two ends and the central part of the central spring section on the other side, forcing the central spring section away from the conductor. Because of the flexibility or springiness of the material of the flexed central spring section, a spring force is applied to assist in restraining the conductor in the slot.

Abstract: A control system, for a motor which may be subjected to stalling loads, provides a non-linear increase in motor current during stalling conditions to maintain rated horsepower. When the maximum transient overload current is reached, this current is maintained to keep the motor torque at a maximum until the motor is stalled. This provides maximum motor torque down to a stalled condition and resists stalling. A limit controller determines the maximum time a particular overload motor current can be maintained and when this time has passed the motor current is reduced to rated current. If the motor should stall completely a further reduction in motor current is made automatically.

Abstract: A control or protection system for a line commutated inverter detects prescribed conduction-through faults and initiates a control sequence for recovery without shutting down the inverter. A conduction sensor in each leg provides a signal representing conduction and this is compared with a signal representing the forbidden interval when conduction should not occur in that leg. When conduction is detected in a forbidden interval it normally indicates a conduction-through fault and the gating pulses are advanced for at least the next two pulses to occur immediately but with a limit of 60.degree.. This causes commutation of the legs which are carrying the conduction-through fault current provided that sufficient volt-seconds remain in the alternating current part of the circuitry.

Abstract: A dry well fuseholder for use with electrical apparatus containing a dielectric liquid. The holder has an outer, liquid-tight, tubular shell and a number of components inside the shell abutting coaxially in the following order: an annular fitting adapted for supporting the fuseholder on the apparatus; an insulating tube; an annular fuse terminal; another insulating tube; and an annular fuse terminal closed at one end. Glass fibers bonded together with epoxy resin are wound over the peripheral surface of the fitting-tube assembly to produce the shell. Seals are located between the fittings and shell near the joints of fittings and tubes. These seals are composed of a material which swells on contact with the dielectric liquid. This is a division, of application Ser. No. 680,209, filed Apr. 26, 1976, now U.S. Pat. No. 4,081,778.

Abstract: An improved breaker strip for a domestic refrigerating appliance which may be fitted in place prior to the appliance being insulated by an in situ foaming process to prevent foam leakage. First and second mechanical sealing means of a conventional type are provided to seal along the edges of the breaker strip to the appliance walls. An additional flange seal is further provided for each of the first and second sealing means so as to enshroud each means and form a small chamber therebetween and the respective flange seal. Reactive liquid which leaks into the chambers tends to expand to block them prior to any escape of such liquid past the conventional seals, and also to bias the conventional seals into greater sealing contact with the appliance walls.

Abstract: A friction hoist having at least two friction wheels each carrying a rope supporting a counterbalanced conveyance includes a motor to rotationally drive at least one of the wheels. The wheels are mounted for independent rotation on a common shaft and are permitted limited axial motion with respect to one another. A braking apparatus is provided for engagement with outer faces of the wheels while opposed inner faces of adjacent wheels are provided with a braking material such that actuation of the braking apparatus forces the wheels together and the wheels are braked as a unitary structure.

Abstract: A dry well fuseholder for use with electrical apparatus containing a dielectric liquid. The holder has an outer, liquid-tight, tubular shell and a number of components inside the shell abutting coaxially in the following order: an annular fitting adapted for supporting the fuseholder on the apparatus; an insulating tube; an annular fuse terminal; another insulating tube; and an annular fuse terminal closed at one end. Glass fibers bonded together with epoxy resin are wound over the peripheral surface of the fitting-tube assembly to produce the shell. Seals are located between the fittings and shell near the joints of fittings and tubes. These seals are composed of a material which swells on contact with the dielectric liquid.