mechhead
10 W
Here is a new geared hub I've been looking at as something better than the swx bafang for a variety of reasons that will become aparent.
having ordered two to test and hot up, they arrived swiftly direct from mxus factory
Photos to come
a cassett version to go in a wheel with steel gears (aliexpress) 47.5mm dia 36t
and a freewheel threaded version to convert to a crossbreak style mid drive
inside the motor
6 turns 10 strands .5mm copper
the usual nylon gears
a multi screw mounted sun gear ( good potential for regen mod )
20 pole 18 slot 120mmx18mm stator with .35mm laminates
it was a small battle to work out which version of this motor has the meatiest windings
when asked about motor speeds i eventually got the spec sheets for their two fastest motors
and they claimed that the 48v 386rpm version was fastest so i asked for the spec sheet for the fastest 36 volt one and ...
48v 386 rpm
36v 349rpm
ok convert to kv and actual motor rpm gear ratio 5:1
so motor a (48v 386rpm 10t) 5*386=1930 rpm of motor @48v
to derive KV : rpm/volts 1930/48=40.2833 rpm/v
so motor b (36v 349rpm 6t) 5*349=1745 rpm motor @36v
to derive KV :rpm/volts 1745/36=48.47222 rpm/v
so we have a winner the badly named "36v" motor is the badass with 6 turns to the others 10
so speed it up to 48v
motor b (36v349rpm) take motor KV and multiply by new voltage of 48
48.47222*48=2326.667rpm now add gearbox reduction to give hubshell rpm or that of thebuilt wheel at noload speed and you get 2326.667/5=465rpm of wheel
so to compare motors properly at same voltage noload speed and you get
motor A (48v386rpm) @48v = 386rpm
motor B (36v349rpm) @48v = 465rpm
so commutation frequency 2326rpm X 10 pole pairs / 60seconds = 387hz
correct me you lot if im wrong but isn't 387hz a way short of sensible frequency limit for .35mm lams ?
what if we delta it
any here are spec sheets of motor load curves if i can make the attachments work
having ordered two to test and hot up, they arrived swiftly direct from mxus factory
Photos to come
a cassett version to go in a wheel with steel gears (aliexpress) 47.5mm dia 36t
and a freewheel threaded version to convert to a crossbreak style mid drive
inside the motor
6 turns 10 strands .5mm copper
the usual nylon gears
a multi screw mounted sun gear ( good potential for regen mod )
20 pole 18 slot 120mmx18mm stator with .35mm laminates
it was a small battle to work out which version of this motor has the meatiest windings
when asked about motor speeds i eventually got the spec sheets for their two fastest motors
and they claimed that the 48v 386rpm version was fastest so i asked for the spec sheet for the fastest 36 volt one and ...
48v 386 rpm
36v 349rpm
ok convert to kv and actual motor rpm gear ratio 5:1
so motor a (48v 386rpm 10t) 5*386=1930 rpm of motor @48v
to derive KV : rpm/volts 1930/48=40.2833 rpm/v
so motor b (36v 349rpm 6t) 5*349=1745 rpm motor @36v
to derive KV :rpm/volts 1745/36=48.47222 rpm/v
so we have a winner the badly named "36v" motor is the badass with 6 turns to the others 10
so speed it up to 48v
motor b (36v349rpm) take motor KV and multiply by new voltage of 48
48.47222*48=2326.667rpm now add gearbox reduction to give hubshell rpm or that of thebuilt wheel at noload speed and you get 2326.667/5=465rpm of wheel
so to compare motors properly at same voltage noload speed and you get
motor A (48v386rpm) @48v = 386rpm
motor B (36v349rpm) @48v = 465rpm
so commutation frequency 2326rpm X 10 pole pairs / 60seconds = 387hz
correct me you lot if im wrong but isn't 387hz a way short of sensible frequency limit for .35mm lams ?
what if we delta it
any here are spec sheets of motor load curves if i can make the attachments work