ADI TRINAMIC COOLSTEP TECHNOLOGY
With ADI Trinamic, BrightSource received the power and energy efficiency performance it needed to add to its overall sustainability and energy production goals. The ADI Trinamic CoolStep feature is important to BrightSource since the units that control the motors are powered by 12 W PV panels and a 36 Wh powerpack backup, making energy efficiency a crucial aspect of its operation.
Originally developed for medical devices and lab automation, CoolStep is a sensorless, load-dependent, current control that always drives motors at the minimum amount required for the actual load condition. By doing so, the technology reduces the motor energy consumption, and heat generation. Also, by eliminating the current safety margin and allowing for temporary current boosts, CoolStep allows for smaller motors since less torque reserve is required.
ADI TRINAMIC STALLGUARD TECHNOLOGY
The ADI Trinamic StallGuard feature is a sensorless load measurement for stepper motors, which allows BrightSource to perform load detection on heliostats that require high reliability movements. StallGuard gives cost-effective feedback on the diagnostics on the load-angle along with sensitivity data that can be adjusted to fit the application’s need. This makes it ideal for sensorless homing, self-calibration, distance measurement, or to verify all mechanics still function within the safety margins.
Implemented in a standard stepper motor driver, the sensorless load detection eliminates the need for reference or limit switches and reduces cost and complexity of applications where precise referencing is required. Normally, open-loop stepper drives lose step count in overload situations as they stall; for example, when an axis is obstructed. StallGuard prevents step loss, keeping step count integrity by stopping the motor when the set load value is reached. The sensorless technology can detect up to 1024 different load levels, allowing for high resolution feedback for continuous monitoring of the system.