First, hand crank generator common faults and repairs
1.1 The generator does not move, there is a stuck phenomenon or it feels heavy when shaken.
cause:
1) There is a collision between the generator stator and the rotor.
2) The speed increasing gear is not meshed well or the gear is damaged.
3) The ball bearing is dirty and the lubricant is dry.
4) The small cover fixing screw is loose, so that the position of the rotor in the bearing is not correct.
5) The shaft is bent.
Repair method:
1) Remove the generator and reassemble it so that the stator and rotor clearances are appropriate.
2) Adjust the gear position to make it mesh. If the gear is damaged, it should be replaced.
3) Remove the bearing shaft and clean it.
4) Adjust the position of the small cover and tighten the screws.
5) Remove the correction from the shaft.
1.2 When the crank is shaken, it slips and there is no voltage output.
cause:
1) The eccentric fixing screw is loose, resulting in poor gear meshing.
2) The governor spring is loose or insufficiently flexible.
Repair method:
1) Adjust the position of the eccentric wheel and engage the gears, and then tighten the eccentric screw.
2) Turn the governor nut and tighten the spring so that the friction point presses the friction wheel.
1.3 Generator voltage is unstable.
cause:
1) The screw of the governor device is loose, and the friction point of the flywheel is not tight.
2) The spring of the governor is loose or not flexible enough.
Repair method:
1) Fix the screw on the governor so that the speed control contact is next to the friction wheel.
2) Adjust or replace the spring.
1.4 When shaking the handle of the generator, it will cause jitter.
cause:
1) The generator rotor is unbalanced.
2) The generator shaft is not straight.
Repair method:
1) Place the rotor on the balance frame to adjust the balance.
2) Correct the shaft.
1.5 casing leakage.
cause:
1) The inner lead shell or the generator spring lead wire hits the shell.
2) Insulation caused by moisture is not good. Repair method:
1) Check the wiring to eliminate the shelling phenomenon.
2) Drying in an oven, the temperature is controlled within 60 ° C ~ 80 ° C.
1.6 Generator has no output voltage or voltage is very low.
cause:
1) The winding is broken.
2) The circuit is broken.
3) Poor carbon brush contact or carbon brush wear.
Repair method:
1) Rewind the windings.
2) Check the broken wire and re-weld it.
3) Adjust the contact surface of the carbon brush and the rectifying ring or replace it with a carbon brush.
1.7 When the generator is shaken, the carbon brush has a sound and sparks are generated.
cause:
1) The carbon brush and the rectifying ring are worn, the surface is not smooth, and the contact is poor.
2) The carbon brush position offset is not in contact with the rectifier ring.
Repair method:
1) Replace the carbon brush, the rectifier ring wear can be repaired with fine sandpaper, and then cleaned with gasoline.
2) Adjust the carbon brush position so that it is centered in the rectifier ring and makes it fully contact.
Second, the measurement mechanism common faults and repairs
2.1 The pointer is not flexible and has a stuck phenomenon.
cause:
1) There are fine fibers or iron cores on the coils, and there are impurities such as iron filings in the gap between the poles.
2) When the coil rotates, the guide wire hits the fixed part.
3) The core is loose and touches the coil.
4) The coil is deformed under pressure and collides with the iron core and the pole.
5) There are fine fibers on the dial that touch the hands.
Repair method:
1) Clean the impurities with a fine probe.
2) Adjust the guide wire so that it does not touch the fixed part.
3) Fixed core bolts.
4) Reform the winding wire frame to eliminate the friction between the iron core and the pole.
5) Eliminate the fine fibers on the dial.
2.2 The pointer does not mean the "∞" position.
cause:
1) The guide wire is deformed, and the additional torque becomes large.
2) The power supply voltage is insufficient.
3) The voltage loop resistance deteriorates and the number increases.
4) The voltage coil is partially shorted or broken.
Repair method:
1) The rectifying guide wire will make the pointer in the "∞" position when no power is applied.
2) Repair the power supply, generator or inverter.
3) Configure the loop resistance.
4) Rewind the voltage coil.
2.3 The pointer is beyond the "∞" position
cause:
1) An insulation resistance meter with an infinite balance coil that is shorted or open.
2) The voltage loop resistance becomes small for some reason.
3) Deformation of the guide wire.
Repair method:
1) Rewind the infinite balance coil.
2) Change the voltage loop resistance.
3) Repair or replace the guide wire.
2.4 The pointer does not refer to the zero position.
cause:
1) The current loop resistance value changes. When the resistance value decreases, the pointer exceeds the zero position. When the resistance value increases, the pointer is less than the zero position.
2) The voltage loop resistance changes, the pointer exceeds the zero position when the resistance value increases, and the pointer is less than the zero position when the resistance value decreases.
3) The performance of the filament is changed.
4) The current coil or zero balance coil has a partial short circuit or open circuit.
Repair method:
1) Change the current loop resistance.
2) Change the voltage loop resistance.
3) Replace the guide wire.
4) Rewind the coil or zero balance coil.
2.5 pointer displacement is large.
cause:
1) The shaft tip is worn or rusted.
2) The bearing is broken or has debris.
Repair method:
1) Grind or refit the shaft tip.
2) Remove debris or replace bearings.
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