On 25 Oct, 23:35, (Andrew Gabriel) wrote:
In article ,
* * * * robgraham writes:

how Bosch can
claim that a lawnmower with a 36v Li-polymer powered dc motor can have
the same capability as a 1700w ac motor. *

I think most electric mowers are universal motors (i.e. with
brushes and a commutator).

Something that has already adopted the cost and complexity of Li-Po
may well be using a brushless motor too. As the extra cost of going
brushless remains largely constant, while the cost of vaguely robust
brushgear goes up with power, then this makes even more sense for
powerful motors. Once you have brushless control and some vaguely
smart control gear, you can get a lot more initial starting torque for
little effort.