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US 8,115,428 B2Granted
Electric motor control
AssigneeTRW Inc.
InventorsConnel Brett Williams, Christopher David Dixon
Life of this patent
Estimating the term…
Abstract
A control system for an electric motor is arranged to determine the position of the motor from at least one electrical parameter by means of a position determining algorithm. It is further arranged to monitor at least one algorithm parameter defined by the algorithm and if the monitored parameter meets a predetermined fault condition to generate a fault indication.
Claims25
A control system for an electric motor comprising:
- a control unit adapted to be connected to an electric motor and being arranged to determine a position of the motor from at least one electrical parameter by means of a position determining algorithm, the position determining algorithm defining a model of the motor which defines a plurality of states of the model including the motor position, the position determining algorithm including an observer arranged to monitor an output of the model and compare it to a measured parameter thereby to determine a correction factor that can be input to the model, the control unit being further arranged to monitor at least one algorithm parameter defined by the algorithm and to generate a fault indication upon the monitored algorithm parameter meeting a predetermined fault condition.
A control system for an electric motor comprising:
- a control unit adapted to be connected to an electric motor and being arranged to determine a position of the motor from at least one electrical parameter by means of a position determining algorithm, the control unit also arranged to monitor a motor position parameter defining the motor position and a motor velocity parameter defining a motor velocity, the control unit further arranged to compare the motor velocity parameter with a differential of the motor position parameter to determine whether a fault condition is met and, upon the fault condition being met, to generate a fault indication.
A control for an electric motor comprising:
- a control unit adapted to be connected to an electric motor and being arranged to determine a position of the motor from at least one electrical parameter by means of a position determining algorithm, the control unit also arranged to monitor at least one algorithm parameter defined by the algorithm, the control unit being further arranged to run a checking algorithm that defines a checking parameter, the control unit being operable to compare the position determining parameter to a predetermined fault condition and to compare the checking parameter with a checked parameter of the position determining algorithm to determine whether the fault condition is actually met, and upon the fault condition being met, to generate a fault indication.
A control system for an electric motor comprising:
- a control unit adapted to be connected to an electric motor and being arranged to determine a position of the motor from at least one electrical parameter by means of a position determining algorithm, the control unit being further arranged to monitor at least one algorithm parameter defined by the algorithm and to generate a fault indication upon the monitored algorithm parameter meeting a predetermined fault condition;
- and
- a DC link to which a DC link voltage is applied, and a drive stage controller arranged to connect the DC link to windings of the motor to control the motor, the drive stage controller being arranged to determine an electrical parameter of the windings from an electrical parameter of the DC link.
Dependencies are inferred from the claim text.