One possable reason for failure to start could be as simple as a brush not making contactwith the commutator. Also if the commutator segments are dirty this could also contribute to the problem
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There could be one phase open, contactor overload tripped or the motor has a coil burned open.
Yes, that is one of the major advantages of a three-phase induction motor.
Split Phase Induction Motor.
capacitive start motors start by themselves however a normal single phase induction motor requires a starter motor to 'kick-start' the motor into action.
yes the motor will run but will draw more current and the torque will be not constant means not smooth due to unbalanced current
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.