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With the success of the MP15, there was a demand for a model with an advanced AC drive system. The MP15AC replaced the MP15DC's DC generator with an alternator producing AC power which is converted to DC for the traction motors with a silicon rectifier. The MP15AC is 1.5 ft (457 mm) longer than an MP15DC, the extra space being needed for the ...
10 ft 10 in (3.30 m) Floor height: 40 in (1,016 mm) Doors: Sliding, 6 per car: Maximum speed: 75 mph (121 km/h) Traction system: Pre-rehab: Chopper control Post rehab: Alstom ONIX 2000 IGBT–VVVF [21] [22] Traction motors: Pre-rehab: DC motor Post rehab: 4 × Alstom 4EXA 2122 165 kW (221 hp) 3-phase AC induction motor: Power output: 660 kW ...
Michael Faraday made a Homopolar motor in 1831. Superconducting DC homopolar machines use superconductors in their stationary field windings and normal conductors in their rotating pickup winding. In 2005 the General Atomics company received a contract for the creation of a large low speed superconducting homopolar motor for ship propulsion. [1]
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Such a test starts with the motors at +25 °C (and the outside air used for ventilation also at +25 °C). In the USSR, per GOST 2582-72 with class N insulation, the maximum temperatures allowed for DC motors were 160 °C for the armature, 180 °C for the stator, and 105 °C for the collector. [13]
Small DC motors are used in tools, toys, and appliances. The universal motor, a lightweight brushed motor used for portable power tools and appliances can operate on direct current and alternating current. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.