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250 watt hub motor E-bike; Is it Enough?
250 watt motors are the most used motor on commercially available electric bikes. They are popular in Europe (and Asia) where in many countries there is a 250 watt power limit on E-bikes. Because m…
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When a 250-V, 50 hp, 1000 rpm D.C. shunt motor is used to supply rated output power to a constant torque load, it draws an armature current of 160A. The armature circuit has a resistance of 0.04 Ω and the rotational losses are equal to 2 KW. An external resistance of 0.5Ω is inserted in series with the armature winding. For this condition compute (i) the speed (ii) the developed power (iii) the efficiency assuming that the field loss is 1.6 KW.
When a 250-V, 50 hp, 1000 rpm D.C. shunt motor is used to supply rated output power to a constant torque load, it draws an armature current of 160A. The armature circuit has a resistance of 0.04 Ω and the rotational losses are equal to 2 KW. An external resistance of 0.5Ω is inserted in series with the armature winding. For this condition compute (i) the speed (ii) the developed power (iii) the efficiency assuming that the field loss is 1.6 KW.
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When a 250-V, 50 hp, 1000 rpm D.C. shunt motor is used to supply rated output power to a constant torque load, it draws an armature current of 160A. The armature circuit has a resistance of 0.04 Ω and the rotational losses are equal to 2 KW. An external resistance of 0.5Ω is inserted in series with the armature winding. For this condition compute (i) the speed (ii) the developed power (iii) the efficiency assuming that the field loss is 1.6 KW.
When a 250-V, 50 hp, 1000 rpm D.C. shunt motor is used to supply rat…
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