Solar cars use CSIRO motor Link
http://www.csiro.au/resources/pf11g.html#design 
is a similar lay out to Golden printed Motor
This BLDC motor achieves 98 per cent efficiency at 1800w and is generally accepted as the most efficient in solar car racing. It has a low active component weight (6 kg), and a total wheel weight of 14.5 kg (including the tyre). with a top speed of around 110kl/h
In-wheel motors used by other teams typically had energy efficiency less than 95 per cent and weighed twice as much -- not including the wheel and tyre.
Pricing information
This one-page document details pricing and conditions for purchasing a solar car motor kit. The price of a single kit is around A$12 000.
Specifications pdf link
http://www.ata.org.au/wp-content/uploads/marand_high_efficiency_motor.pdf Number of poles 40
Number of phases 3
Approximate weight of frameless (kg) 10.9
Nominal speed (rad/s)2 111
Nominal torque (Nm)3 16.2
Maximum continuous torque at 111 rad/s (Nm)4 31
Magnetic gap – each side (mm) 2
Phase resistance (?) 0.0757
EMF constant – L-N RMS EMF/speed (Vs/rad)5 0.39
Torque constant per phase (Nm/A)6 0.39
Performance at nominal rating1
L-N RMS EMF (V)5 43
RMS phase current (A)6 13.9
Copper loss (W) 43.9
Eddy current loss (W) 2.6
Windage (W)7 2.1
Total loss (W) 48.6
Output power (W) 1800
Efficiency (%) 97.4
Winding, temperature, rise (K) 22
Overload, winding, temperature, rise (K)8 64
Absolute maximum ratings1
Maximum, winding, temperature (K) 383
Maximum speed (rad/s) 300
Maximum torque (Nm) 50.2
3 × 100 ?H Inductors 9
Notes
