One of implementations of our novel proprietary axial-flux coreless technology (patents pending) is a line "Kite" of frameless slim self-ventilated machines for applications where high power-to-weight ratio is critical.

The electric machine is made as a "sandwich" consisting of 2 rigid permanent magnets rotor disks mechanically connected each other and an interposed solid stator plate secured in the customer device, using an over-mold mounting ring.

"Kite" motors / generators are recommended for high-speed applications (e.g coupled with gear-box) to perform extremely high power to weight ratio (more than 6 kW/kg) and efficiency up to 97%. Nevertheless, if need, they can be used in direct drives at speeds typically down to 1,200 rpm (to keep self-ventilation). A forced stator cooling significantly increases the torque ability and makes it possible to work at about zero speed.

DISTINCTIVE FEATURES

Axial magnetic field Twin-rotor sandwich design Power-to-weight up to 5-6 kW/kg 2-5 thickness solid stator Very low inductance

Coreless magnetic circuit Absolute coggingless Peak Torque-to-weight up to 5-8 Nm/kg 8-15 mm overall thickness Self-ventilation

A feature of these motors is absolute no cogging and as result true silence and smooth operation at any speed.
Another feature is very small inductance. This leads to extremely low internal impedance – important advantage in generation mode. An optional rotor position sensor is supplied on demand.

 

DIMENSIONS & PERFORMANCES

 

Symb	Meaning	unit	Typical range	Example	Symb	Meaning		unit	Typical range	Example
OD	Overall Ø	mm	100 ÷ 250	120	N	Rotor holes thread			M2 ÷ M6	M2
ID	Thru hole Ø	mm	25 ÷ 80	36	M	Mounting ring thickness		mm	÷	4.1
P	Mounting ring ext. Ø	mm	85 ÷ 230	102	S	Stator thickness		mm	2.5 ÷ 6.5	3.2
DM	Mounting holes position circle Ø	mm	90 ÷ 220	106	L	Overall thickness		mm	8 ÷ 20	10.5
d	Mounting hole Ø	mm	3.2 ÷ 10.5	4.4	g	Nominal air-gap	mm		0.3 ÷ 0.8	0.5
T	Rotor thread holes position circle Ø	mm	30 ÷ 90	40	G	Weight	kg		0.1 ÷ 1.8	0.225