BD brake power supplies comparison

BD3 is a new, advanced brake power supply that offers faster eddy current brake control and higher current capability than BD1.

  BD1 BD3-22.5A BD3-45A
Continuous current specification

17.5A @ 40°C ambient temp.
20A @ 25°C ambient temp.

22.5A @ 40°C ambient temp.

45A @ 25°C ambient temp.
40A @ 40°C ambient temp.

Dimensions 18cm x 13cm x 9.5cm 14cm x 15.5cm x 12cm 26cm x 23.5cm x 11cm
Mass 0.6kg 1.3kg 3.3kg
Cooling type Fan Fan and radiator outside of electronics compartment
No worry about dirt ingress
Power supply configurations 1-phase 120V
1-phase 230V(400V)
3-phase 120V (208V)
1-phase 120V or 230V
3-phase+neutral 120V(208V) or 230V(400V)
Brake charge time
Frenelsa F16-160
0A -> 15A
1-phase 230V
400ms
3-phase 230V(400V)
70ms
Brake discharge time
Frenelsa F16-160
15A -> 5A
100ms 4ms
Brake discharge time
Frenelsa F16-160
15A -> 0A
1500ms 12ms
Brake charge time
Frenelsa F16-GR
0A -> 22A
3-phase 230V(400V)
180ms
Brake discharge time
Frenelsa F16-GR
22A -> 5A
6.5ms
Brake discharge time
Frenelsa F16-GR
22A -> 0A
20ms
Control Pulse Width Modulated input controls brake Pulse Width directly Brake current is controlled internally in closed loop by a fast microcontroller
PWM input or CAN-bus sets brake current target
Diagnostics CAN-bus: brake current and controller temperature feedback
Additional information possible in future with firmware updates
Load cell amplifier Built in Available as separate, low cost device (LCA1 ~25EUR net)
Price ~250EUR net ~500EUR net ~600EUR net

Which power supply should I get?

Recommendation based on dynamometer types:

  • Engine dynamometer, hub dynamometer, low inertia dynamometer: BD3
  • Roller chassis dynamometer with typical inertia: BD1 is sufficient but BD3 will get you better control

I want most economical solution.
Take BD1. It will work with all dynamometers, however on low inertia dynos, speed control won’t be as fast and precise as with BD3.

I want the best solution.
Take BD3 it will provide you with probably the fastest torque response on the market. You can compare charge and discharge (or magnetization and demagnetization) times with competition products.

My brake needs 22A current. Should I get 22.5A or 45A version to be safe?
You should get 22.5A version. It could deliver continuous 22.5A in 40°C ambient temperature for unlimited time. 45A version is bigger, heavier, and it will cost you more.