B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/23, 318/96
B66B 1/28 (2006.01) H02M 7/539 (2006.01) H02P 25/10 (2006.01)
Patent
CA 1280156
ABSTRACT OF THE DISCLOSURE An apparatus for controlling a three-phase inverter supplying the a.c. motor of an elevator, the inverter having a power stage implemented with semiconductor switches, and the apparatus comprising an electronic control unit for producing a velocity reference value and a tachometer generator for producing an actual velocity value, voltage measuring elements for measuring a.c. voltages at the inverter output, and pulse width modulators and drivers for controlling the semiconductor switches in the inverter's power stage with control signals derived from the pulse width modulators. With the apparatus of the invention, fast control of the control voltage is achieved. Moreover, simpler voltage measuring elements may be used instead of current measuring elements. The apparatus of the invention comprises a speed regulator for producing a rotor current frequency and the frequencies of first reference voltages from the actual velocity value and the velocity reference value, a curve calculator for producing the amplitude of the reference voltages from the rotor current frequency and the frequency of the reference voltages, a three-phase oscillator for producing second reference voltages from the frequency and amplitude of the first reference voltages, and voltage regulators for producing control voltages for the pulse width modulators from additional reference voltages obtained from the second reference voltages and the actual value voltages obtained at the inverter output.
530699
G. Ronald Bell & Associates
Kone Elevator Gmbh
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