Demonstration of single axis combined attitude control and energy storage using two flywheels

Control of a High-Speed Flywheel System for Energy Storage in Space Applications

“…In fact, there are inverter losses and they need to be considered in order to improve the control. One way to model the losses is to include an additional resistive term, R inv , on the AC side of the power balance equation given in (9) as shown in (11). This effectively makes the assumption that the losses in the inverter are linearly proportional to magnitude of the motor phase current, i qs r .…”

“…However, another way to solve for the motor control current that is easier and more intuitive to implement is to return to equation (11) and consider the measured current, i qs rM , separately from the commanded motor control current, i qs r* . This is shown in (14).…”

Research Progress on the Application of High-speed Brushless DC Motor in Magnetically Suspended Inertial Actuator

“…The position sensorless algorithms (Kenny and Kascak, 2002) were used in the motor control for the NASA "inhouse" development work of the ywheel energy storage system. Two MSFWs (Kenny, Jansen and Kascak, 2004) were utilized for single axis combined attitude control and energy storage systems. In 2005, Altay and Tekinalp compared integrated power and attitude control system utilizing variable speed control moment gyros technology with the conventional technologies like electrochemical batteries, reaction wheels and control moment gyroscopes.…”

Filtering and Control of High Speed Motor Current in a Flywheel Energy Storage System

“…Algorithms have been developed to control the motor/generator such that the flywheel can store energy in charge mode and supply energy to loads in discharge mode while regulating the DC bus voltage [1]. Additional algorithms have been developed to combine the attitude control and energy storage functions of two separate flywheel units [2,3]. The innermost loop of the flywheel control for all of the algorithms is a current loop that is based on the field orientation control technique in which current is directly proportional to motor torque [4,5].…”

“…1. The NASA Glenn Research Center has been developing advanced technologies for these subsystems over the last several years and has demonstrated energy storage at 60,000 rpm with one unit and combined single axis attitude control and energy storage using two units [1,2].…”