As we all know, right side of the engine's crankcase consists of clutch assembly and the right side consists of magneto coil assembly. This magneto coil assembly is responsible for the parameters like ignition, battery charging and lightings. It acts as a generator which produces AC voltage and we all know that it has to be converted into DC for the above mentioned parameters. Regulator and rectifier unit or known as RR unit comes handy here in converting the AC voltage to DC and to regulate it. In this article, let's see something about the RR unit and it's types.
Generally, RR unit will be placed under the pillion seat or near the side panels of the motorbike. It do a multiple job of regulating and rectifying the AC voltage produced. In the magneto unit, there'll be only three components such as a coil assembly, a magnet and a pickup coil. In some older models, magnet assembly will be stationery and the coil assembly will rotate. But motorbikes these days have a rotating magnet and a stationery coil assembly. The magnet will be connected to the left end of the crankshaft.
Whenever we try to crank the motor, magnet will also rotate therefore inducing a EMF at the coils. When the engine is at idling condition, 20-40V will be generated, varies from model to model. When the engine is under the higher RPM bands, max of 140-200V will be generated which can be utilized. Pickup coil in the crankcase sense some voltage and send it to the ignition system (CDI or TCI box) and it is responsible for the spark timing. Let's see about the ignition system in a separate article and let's start about the RR unit.
Mainly, there are two types. In motorbikes like old Hero Honda Splendor and in other models, everything works on AC voltage including the lightings. Here, the produced AC voltage is directly sent to the RR unit. Firstly, it is regulated to a constant 12V because, if we direct the produced voltage to the headlamp bulb, the fuse will be blown and so it should be regulated. So the RR unit regulates the voltage to 12V and directs it to the headlamp unit. Rectifier converts the AC voltage into DC and regulates it and directs it for charging the batteries and ignition module.
From battery, everything is DC and it operates other accessories. In motorbikes like Bajaj Pulsar, everything operates in DC voltage including the headlamp bulb. Produced voltage in the magneto coil assembly is directly sent to the RR unit. RR unit rectifies and regulate the alternating voltage. Converted DC voltage is then sent for operating the headlamp bulb and other accessories. From this we can conclude that motorbike's RR unit plays an important role in charging the batteries and in operating other accessories.
If the motorbike's battery is rapidly discharging or not charging, firstly we have to test our motorbike's RR unit. Mainly we have to check the input and output of the unit that whether the voltages are in perfect numbers. Surely a question will be raised inside you about the ignition system.. Right? Produced AC voltage in the magneto assembly will also be sent to the ignition control module or CDI or TCI box via RR unit to distribute the spark at correct timing with the help of pickup coil. Will see about the most commonly used ignition system in a separate article. If you have any suggestions or corrections or if I conveyed something wrong, please let me know in the comment section below.
Image source - YouTube/VAGANAVIYALதமிà®´்
Related articles
• Motorbike battery charging problem - Troubleshooting
• Things to check when the motorbike is not cranking
• Ignition system - Fault diagnosis
Generally, RR unit will be placed under the pillion seat or near the side panels of the motorbike. It do a multiple job of regulating and rectifying the AC voltage produced. In the magneto unit, there'll be only three components such as a coil assembly, a magnet and a pickup coil. In some older models, magnet assembly will be stationery and the coil assembly will rotate. But motorbikes these days have a rotating magnet and a stationery coil assembly. The magnet will be connected to the left end of the crankshaft.
Whenever we try to crank the motor, magnet will also rotate therefore inducing a EMF at the coils. When the engine is at idling condition, 20-40V will be generated, varies from model to model. When the engine is under the higher RPM bands, max of 140-200V will be generated which can be utilized. Pickup coil in the crankcase sense some voltage and send it to the ignition system (CDI or TCI box) and it is responsible for the spark timing. Let's see about the ignition system in a separate article and let's start about the RR unit.
Mainly, there are two types. In motorbikes like old Hero Honda Splendor and in other models, everything works on AC voltage including the lightings. Here, the produced AC voltage is directly sent to the RR unit. Firstly, it is regulated to a constant 12V because, if we direct the produced voltage to the headlamp bulb, the fuse will be blown and so it should be regulated. So the RR unit regulates the voltage to 12V and directs it to the headlamp unit. Rectifier converts the AC voltage into DC and regulates it and directs it for charging the batteries and ignition module.
From battery, everything is DC and it operates other accessories. In motorbikes like Bajaj Pulsar, everything operates in DC voltage including the headlamp bulb. Produced voltage in the magneto coil assembly is directly sent to the RR unit. RR unit rectifies and regulate the alternating voltage. Converted DC voltage is then sent for operating the headlamp bulb and other accessories. From this we can conclude that motorbike's RR unit plays an important role in charging the batteries and in operating other accessories.
If the motorbike's battery is rapidly discharging or not charging, firstly we have to test our motorbike's RR unit. Mainly we have to check the input and output of the unit that whether the voltages are in perfect numbers. Surely a question will be raised inside you about the ignition system.. Right? Produced AC voltage in the magneto assembly will also be sent to the ignition control module or CDI or TCI box via RR unit to distribute the spark at correct timing with the help of pickup coil. Will see about the most commonly used ignition system in a separate article. If you have any suggestions or corrections or if I conveyed something wrong, please let me know in the comment section below.
Image source - YouTube/VAGANAVIYALதமிà®´்
Related articles
• Motorbike battery charging problem - Troubleshooting
• Things to check when the motorbike is not cranking
• Ignition system - Fault diagnosis
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