Method for Operating a Frequency Converter and Frequency Converter
AssigneeLenze Swiss AG
InventorAndreas BURGERMEISTER
Life of this patent
Estimating the term…
Abstract
A method for operating a frequency converter includes the steps of: generating phase voltages with a predetermined amplitude and a predetermined frequency from an intermediate circuit voltage by pulse width modulation, wherein the phase voltages are output between associated phase connections of the frequency converter. In a first operating mode of the frequency converter, the method includes the steps of: measuring voltages between the phase connections and a reference potential; calculating the phase voltages from the measured voltages by subtraction; and regulating the phase voltages to the predetermined amplitude on the basis of the calculated phase voltages.
Claims11
A method for operating a frequency converter, the method comprising the steps of:
- generating phase voltages with a predetermined amplitude and a predetermined frequency from an intermediate circuit voltage by pulse width modulation, wherein the phase voltages are output between associated phase connections of the frequency converter,
- wherein,
- in a first operating mode of the frequency converter, the method further comprises the steps of:
- measuring voltages between the phase connections and a reference potential;
- calculating the phase voltages from the measured voltages by subtraction;
- and
- regulating the phase voltages to the predetermined amplitude based on the calculated phase voltages.
A frequency converter, comprising:
- means for generating phase voltages with a predetermined amplitude and a predetermined frequency from an intermediate circuit voltage via pulse width modulation, wherein the phase voltages are output between associated phase connections of the frequency converter;
- a measuring apparatus for measuring voltages between the phase connections and a reference potential;
- and
- a control unit for calculating the phase voltages from the measured voltages by subtraction, and regulating the phase voltages to the predetermined amplitude based on the calculated phase voltages.
Dependencies are inferred from the claim text.