Method for controlling the speed of a three-phase permanent magnet machine having a soft starter by means of a controller cascade, and three-phase machine
AssigneeSiemens Aktiengesellschaft
InventorsHauke Nannen, Heiko Zatocil
Life of this patent
Estimating the term…
Abstract
A battery state estimating apparatus as an embodiment includes a state estimator, a power estimator, and a determiner. The state estimator estimates a state of a battery. The power estimator estimates first power amount charged/discharged by the battery within a charging/discharging period, based on the state. The determiner compares the first power amount with second power amount inputted/outputted to/from the battery within the charging/discharging period and thereby determines validity of the state.
Claims20
A method for controlling a speed of a three-phase permanent magnet machine including a soft starter including thyristors by way of a controller cascade, the method comprising:
- calculating all possible firing times of the thyristors of the soft starter and determining a corresponding torque assigned to each respective firing time of the firing times calculated, resulting from firing of the thyristors at a respective firing time;
- determining a torque corridor based upon a calculation specification, to which an actual speed and a setpoint torque are fed as input variables;
- determining which of the determined corresponding torques lies in the torque corridor and ascertaining, for each corresponding torques determined to lie in the torque corridor, determining the correspondingly assigned firing time of the thyristors;
- and
- firing the thyristors at the correspondingly assigned firing time.
A control device for a three-phase machine including a soft starter including thyristors, comprising:
- at least one processor, configured to carry out at least:
- calculating all possible firing times of the thyristors of the starter and determining a corresponding torque assigned to each respective firing time of the firing times calculated, resulting from firing of the thyristors at a respective firing time;
- determining a torque corridor based upon a calculation specification, to which an actual speed and setpoint torque are fed as input variables;
- determining which of the determined corresponding torques lies in the torque corridor and ascertaining, for each corresponding torques determined to lie in the torque corridor, determining the correspondingly assigned firing time of the thyristors;
- and
- firing the thyristors at the correspondingly assigned firing time.
Dependencies are inferred from the claim text.