. The Street railway journal . Strer-t Ry. Journal FIG. 1.—DIAGRAMS SHOWING CONNECTIONS OF DIFFERENT TYPES OF SINGLE-PHASE MOTORS ley voltage as high as convenient. Tests have been made withload varying from 3 tons to 4 tons, and the starting torque hasexceeded three times the full load running torque. Sparking tests have been made by hauling the car with onemotor only, and by starting directly under 300 volts. Thesparkless commutation obtained under these conditions hasshown that the service to be performedwould allow of an appreciable reduc-tion in weights and dimensions. Thecombined efficie
. The Street railway journal . Strer-t Ry. Journal FIG. 1.—DIAGRAMS SHOWING CONNECTIONS OF DIFFERENT TYPES OF SINGLE-PHASE MOTORS ley voltage as high as convenient. Tests have been made withload varying from 3 tons to 4 tons, and the starting torque hasexceeded three times the full load running torque. Sparking tests have been made by hauling the car with onemotor only, and by starting directly under 300 volts. Thesparkless commutation obtained under these conditions hasshown that the service to be performedwould allow of an appreciable reduc-tion in weights and dimensions. Thecombined efficiency is stated to be 84. car is similar to the usual <1. , and differs from them onlyin the motors and the truck is equipped with twoLatour motors, which are gearedto the axles with a gear reduction1:4, 6. Each motor has four poles, isof 50 hp, and is wound for 300volts, 25 cycles, a. c. The actuaweight per motor is 1350 kg (2970lbs.). The rotor (Fig. 2) bears agreat resemblance to the usuaarmature of d. c. motors. The gapis much less, being only. 2 mm( in.) clearance between therotor and the stator. The stateris shown in Fig. 3. No specialfeature is to be found in it, andthe good characteristics of theLatour motor seem to be due tothe combination of the series mo-tor features at starting and of the repulsion motor features atthe high speed. Good commutation is obtained by properly pro-portioning the commutator and brushes. There are four short-circuiting sets and four collecting sets of these brushes—i. e.,eight sets in all. Both motors are permanently connected in multiple wit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
