YASA Controllers

YASA’s controller series provides powertrain designers with new ways to optimise hybrid and electric vehicle performance, range and cost. The controllers achieve industry leading peak power density of > 40 kVA / L.

The controllers are suitable for use with induction and permanent-magnet machines and, when coupled with YASA axial-flux electric motors, the controllers offer best-in-class size, weight, efficiency and control dynamics.

YASA Si400 Motor controller

The YASA Si400 controller is the first in the series and is available to OEM customers and tier-one partners.
The Si400 delivers up to 200kVA from a 5 litre package weighing just 5.75kg. The controller features innovative thermal management including dielectric oil cooling and is suitable for use with induction, permanent magnet and axial-flux electric motors.
When coupled with YASA’s axial-flux electric motors, the Si400 controller offers best-in-class efficiency and control dynamics.

General Characteristics – Si400

Peak Current (5 secs)500 ARMS
Continuous Current210 ARMS
Input Voltage Range 50 – 400 VDC50 – 400 VDC
Dimensions239 x 267 x 83 mm
Mass5.75 kg
Volume excluding HV terminal area4.8 litres


Typical ratings at 60°C coolant inlet temperature.
Casing dimensions excluding connectors and mounting points.
Mass does not include coolant fluid or phase cables.


Download the Si400 datasheet

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