How to solve the problem that the DC motor is not charged?

Update:25 May 2019
Summary:

1 . The fan pulley is too loose or oily to slip; 2 . Ea […]

1 . The fan pulley is too loose or oily to slip;
2 . Each wire joint is loose or detached, and the wire sheath is broken and grounded to cause a short circuit;
3 . The commutator of the generator (recommended: geared motor) is worn, burnt or oily, the magnetic field coil is open or shorted, the armature coil is broken or shorted, the short circuit between the commutator pieces, and the insulating carbon brush holder is grounded;
4 . Regulator (recommended: easy to reduce reducer) or throttle contact ablation or dirt, balance resistance open circuit, voltage regulator over bridge line burned, throttle pull spring weak, air gap is too small, pressure The limit voltage adjustment is too low, the closing voltage of the breaker is too high or the parallel coil is open.

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