Method for sensorless drive control of an electric vehicle and drive control operating by the method
First Claim
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1. A method for sensorless drive control of an electric vehicle, which comprises:
- driving the vehicle with a rotating field motor;
operated the field motor with an inverter having n phase currents, the inverter being fed with a DC source moved with the inverter and the vehicle, the phase currents determining a stator current of the field motor;
determining actual values of a flux linkage of the field motor and also at least one further variable dependent thereon from;
a registered stator voltage of the field motor; and
at least n−
1 measured phase currents; and
setting the stator current utilizing the actual values of the flux linkage and the at least one further variable dependent thereon.
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Abstract
A method for the sensorless drive control of an electric vehicle, especially an industrial truck, driven by a rotating field motor operated by a power converter, the power converter being supplied by an associated constant voltage source, includes calculating actual values of the flow chain of the rotating field motor and at least one other variable dependant on the actual values from a recorded stator voltage and at least n−1 measured phase flows, and regulating the stator flow of the rotating field drive, which is defined by the phase flows, based upon the actual values.
37 Citations
21 Claims
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1. A method for sensorless drive control of an electric vehicle, which comprises:
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driving the vehicle with a rotating field motor;
operated the field motor with an inverter having n phase currents, the inverter being fed with a DC source moved with the inverter and the vehicle, the phase currents determining a stator current of the field motor;
determining actual values of a flux linkage of the field motor and also at least one further variable dependent thereon from;
a registered stator voltage of the field motor; and
at least n−
1 measured phase currents; and
setting the stator current utilizing the actual values of the flux linkage and the at least one further variable dependent thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In an electric vehicle having a DC source moved with the vehicle, an inverter having n phase currents and being fed by the DC source, and a rotating field motor operated by the inverter, the phase currents determining a stator current of the field motor, a sensorless drive control comprising:
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a measuring device determining;
at least n−
1 phase currents of the n phase currents; and
a voltage value relevant for determining the stator voltage of the field motor; and
an arithmetic unit programmed;
to determine a flux linkage of the field motor and also at least one further variable dependent thereon from the phase currents and from the stator voltage; and
to calculate, from said at least one further variable and from said flux linkage, at least one of;
a nominal value of the stator voltage of the field motor; and
the phase currents for setting the stator current. - View Dependent Claims (14, 15, 16)
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17. An electric industrial vehicle, comprising:
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a DC source moved with the vehicle;
an inverter having n phase currents, said inverter fed by said DC source;
a rotating field motor connected to said inverter and operated by said inverter, said phase currents determining a stator current of said field motor;
a sensorless drive control having;
a measuring device determining;
at least n−
1 phase currents of said n phase currents; and
a voltage value relevant for determining said stator voltage of said field motor; and
an arithmetic unit programmed;
to determine a flux linkage of said field motor and also at least one further variable dependent thereon from said phase currents and from said stator voltage; and
to calculate, from said at least one further variable and from said flux linkage, at least one of;
a nominal value of said stator voltage of said field motor; and
said phase currents for setting said stator current. - View Dependent Claims (18, 19, 20)
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21. A sensorless drive control for an electric vehicle having a DC source moved with the vehicle, an inverter having n phase currents and being fed by the DC source, and a rotating field motor operated by the inverter, the phase currents determining a stator current of the field motor, the drive control comprising:
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a measuring device determining;
at least n−
1 phase currents of n phase currents of the inverter; and
a voltage value relevant for determining the stator voltage of the field motor; and
an arithmetic unit programmed;
to determine a flux linkage of the field motor and also at least one further variable dependent thereon from the phase currents and from the stator voltage; and
to calculate, from said at least one further variable and from said flux linkage, at least one of;
a nominal value of the stator voltage of the field motor; and
the phase currents for setting the stator current.
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Specification