Looking for a Magnetic Powder Brake for Variable Load

Hi,
I’m looking at ATO’s magnetic powder brake (Link: https://www.ato.com/magnetic-powder-brake) with a hollow shaft and wondering — is it only suitable for holding position, or can it be used as a variable torque brake? My goal is to create a variable load for an electric motor test bench. Any suggestions?
Thank you!

Zenobia wrote:
Zenobia, our magnetic powder brake provides constant torque. When it engages, it will brake and decelerate gradually, rather than stopping the shaft immediately.

Zenobia wrote:
Hi, if you’re after a truly adjustable load, a magnetic powder brake can work, but you need a controller to vary the current — the torque is proportional to excitation current. Without that, it will act more like a constant torque brake.

Zenobia wrote:I think if you only need holding torque, the brake alone is fine. However, for controlled variable braking, pair it with a closed-loop current controller to precisely dial in your torque settings.

Thanks for your suggestions. It sounds like with the right controller, it can work as the adjustable load I need.