Miles wrote:That seems close enough to the specification given. Assuming the Kv is actually 190 rpm/V that gives a Km of 0.29 So, a specific Km of 0.42
Yeah. That sounds great so far. If the specs seem to be true, I hope this is also valid for the about 21mOhms of the larger SK-6374 149KV.
My target application is:
Friction driven Bike, limited electronically to German speed limitation (about 30kph) only, ignoring the max. power limit of 250W (because this limit seems senseless, especially since the law only refers to a normative continuous motor rating, which is up to the manufacturer anyway - who can seriously believe that a Hub-w/gear from Bafang or Golden which is labeled "250W" is only able to continuously handle 250W at higher speeds ??)
Skirt bearing of course, in order not to kill the motor by the friction drive - method. The larger no-load current is not really important for me, since it should be mainly a hill climbing support for my GF's bike.
System weight about 100 kgs.
Max. slope of hills to be climbed 10-12% with about 6 to 10kph, therefore the wish for KV 149 and not higher.
=> Torque/Current limited electronically to 4Nm / 62A by either ESC or by self-designed separate switched current limiter in front of the simplest cheap 100A ESC.
If needed, (a later stage), lowest speed support by rotary hall-encoder with round magnet on the axis of the motor, with the new single-chip Infineon digital hall encoder with 3-sensor emulation output (if they finally become available