- Aug 17, 2009
None of the numbers on the motor label come up in any searches; it's probably custom made for Kobalt.5net said:In some other Kobalt models, they use "a 3ph Permanent Magnet motor with hall effect rotor position sensors."
This one definitely doesn't those position sensors. Only 3 wires, I will assume they are 3phase brushless dc sensorless.
but I am really trying to figure it out what type of motor is this, so I disassembled the housing to look for a label and took couple of photos.
It is impossible to find any information on it. Do you think you can identify what type of this motor base on this photo?
Unfortunately the rotor is completely covered by the motor top bracket, so we can't see if it has magnets or just laminations. If you can get a picture at enough of an angle with enough light down in the gap between stator teeth (where the copper windings are) to show the central cylinder of the motor, so we can see the sides of it, we can see if it has magnets. I don't recommend taking the motor itself apart; some of them don't go back together correctly without factory tools.
Or, if you have a thin steel screwdriver (that will stick to magnets) that will fit in that gap between teeth, without pushing against anything, you can see if it sticks to the central cylinder (rotor). If it does, it has magnets and is almost certainly a regular BLDC motor, and an ebike controller will probably run it.
If there are no magnets, a cheap ebike controller probably wont' run it.
If other models use one, it's likely this does too, but can't tell from the pics.
The marking on the battery is actually 80v MAX (dc symbol) 5.0Ah 360Wh (that little "h" makes all the difference).Only 1 battery at the time. The battery is a Kobalt 80V 5.0Ah 360W (at 72v * 5 = 360W?)
Unfortunately, the amps (A) and watts (W) (what we need to know) don't have any direct relation to the Ah and Wh, even though they look similar. Ah is amp-hours, which is capacity. Wh is watt-hours, also capacity, just a different way of stating it. A (amps) is current-delivery ability, and W (watts) is power-delivery ability. Either of the latter two are what we need to know, if we dont' have a rating for the original controller, etc.
Does the mower state how many HP it is? 1HP is about 750W, so that can be used for a guesstimate to pick a controller.
If you had an A (amp) rating for the battery, you could use that, with the nominal voltage (72v) to determine watts, but the amps could be used directly to guesstimate system max current. If you can find the watts, the power limit on the battery, you can calculate backwards with the voltage to get amps. For example, 1000w / 72v = 13.9A.
As noted before, since you don't have sensors on the motor, you can buy a sensorless ebike controller to run it (if it is the right type of motor)Kobalt Greenworks 80v Lawn Mower Motor 48v Testing
I found this video, and look like it is a 48v ebike controller making the motor running with come series batteries.
One is from a Greenworks 80v motor with hall sensors like the one in this thread page 3, but he doesnt hook them to anything
Another one is from Kobalt 80V without sensors.
I think this is very promising for what I am doing.
I also found some brushless motor lokk similar to this mower motor that can be control with the ebike controller.