I am looking for a BLDC controller around 750W-1000W. I have yet to build the motor itself but am thinking it will fall within the operating range of 48-60v @ 10-15amps. When I look online I notice their are a lot of fairly cheap controllers for E-bikes. Can I just pick one of these up and use one of these with a SMPS? Furthermore - do these e-bike controllers only operate at specific voltages/amps? Or will they work within a range inside of whats advertised (generally speaking)?
1 Answer
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Can I just pick one of these up and use one of these with a SMPS?
Probably, provided you build the motor correctly.
Bear in mind that a SMPS generally can't handle current being forced back into it, which happens when the motor is being slowed down by regenerative braking. You may need to put an active clamp across the power supply to stop the voltage from rising.
will they work within a range inside of whats advertised (generally speaking)?
Generally speaking a controller will work within its specified voltage range. If single voltages are specified they usually refer to the nominal battery voltage, eg. a 48 V Lithium-ion battery may consist of 13 cells of 3.7 V each nominal, and 4.2 V fully charged for a maximum voltage of 54.6 V. A controller designed for this battery would have to handle at least 54.6 V.
answered Mar 23, 2021 at 1:49
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\$\begingroup\$ So far only a few bikes support regenerative braking (none of the center-drive ones, and only some hub-drive ones.) So if you restrict your choices to center-drive then regen isn't an issue. \$\endgroup\$ Commented Mar 23, 2021 at 2:56
1000s of e bike and scooter controllers... ignore any that have no datasheet available \$\endgroup\$