A couple of friends and I just bought a large pile of Yasa motors at Makani's going-out-of-business auction.
Makani was a Google X company that spent a lot of money on wind power kites:
https://www.youtube.com/watch?v=uBZayX1QlZQ
before people realized perhaps that wasn't such a great idea.
The motors are similar to and larger than the Yasa 750 R:
https://www.yasa.com/yasa-750
which is an axial flux motor rated at 790Nm peak torque, 200kW peak power.
Here's a teardown of one of the Makani controllers we got with these motors.
The interior structure looks printed on an SLA printer.
With the processor card removed, the film caps and gate drivers
are visible, as are DC/DC power supplies in the box at the top right:
Here's the control card, front and back:
The processor is a TMS320F28377S, curiously that processor does not have TI's magic instaspin FOC firmware.
There's also a TMS570, which is an ARM floating point MCU for transportation applications.
On the backside, a couple of Avago fiber optic ethernet transceiver modules.
A dense array of snubbers on a board that screws directly to the half bridges:
Bus layout with Hass 300-S current transducers on 3 phases and DC.
The bus seems to be nickel plated copper.
It seems odd the current sensors are connected to the control board as single sided
(i.e. not differential) signals.
The half bridges seem to be Cree/Wolfspeed CAS325M12HM2 SiC (a spendy $1375 each at Digikey)
though rumor has it these are custom parts rated to 1700V:
The Makani custom gate drivers screw directly to the half bridges, with an array of small snubbers.
There exists a Cree/Wolfspeed CGD15HB62LP Dual-Channel Isolated Gate Driver
reference design for these half bridges. The reference design gate drivers are driven with a differential signal,
and there is also a CGD12HB00D 2-Channel Differential Transceiver reference design for the gate drivers to enable
retrofitting single-ended systems. I wonder why not an optical link? That seems it would be easier than converting
to differential and back from the PWM to the gate driver mosfets.
Lacking schematics and firmware for the control card, I am planning to drive the
power section of this using a LAUNCHXL-F280049C unless anyone suggests a better idea.
Makani was a Google X company that spent a lot of money on wind power kites:
https://www.youtube.com/watch?v=uBZayX1QlZQ
before people realized perhaps that wasn't such a great idea.
The motors are similar to and larger than the Yasa 750 R:
https://www.yasa.com/yasa-750
which is an axial flux motor rated at 790Nm peak torque, 200kW peak power.
Here's a teardown of one of the Makani controllers we got with these motors.
The interior structure looks printed on an SLA printer.
With the processor card removed, the film caps and gate drivers
are visible, as are DC/DC power supplies in the box at the top right:
Here's the control card, front and back:
The processor is a TMS320F28377S, curiously that processor does not have TI's magic instaspin FOC firmware.
There's also a TMS570, which is an ARM floating point MCU for transportation applications.
On the backside, a couple of Avago fiber optic ethernet transceiver modules.
A dense array of snubbers on a board that screws directly to the half bridges:
Bus layout with Hass 300-S current transducers on 3 phases and DC.
The bus seems to be nickel plated copper.
It seems odd the current sensors are connected to the control board as single sided
(i.e. not differential) signals.
The half bridges seem to be Cree/Wolfspeed CAS325M12HM2 SiC (a spendy $1375 each at Digikey)
though rumor has it these are custom parts rated to 1700V:
The Makani custom gate drivers screw directly to the half bridges, with an array of small snubbers.
There exists a Cree/Wolfspeed CGD15HB62LP Dual-Channel Isolated Gate Driver
reference design for these half bridges. The reference design gate drivers are driven with a differential signal,
and there is also a CGD12HB00D 2-Channel Differential Transceiver reference design for the gate drivers to enable
retrofitting single-ended systems. I wonder why not an optical link? That seems it would be easier than converting
to differential and back from the PWM to the gate driver mosfets.
Lacking schematics and firmware for the control card, I am planning to drive the
power section of this using a LAUNCHXL-F280049C unless anyone suggests a better idea.