摘要:
A method for flying start control of a motor, a computer readable medium, and a power conversion system having an inverter and a controller configured by computer executable instructions in a memory to perform flying start of a rotating motor by field weakening control to control the motor responsive to the motor speed exceeding the rated speed or other non-zero threshold at startup of the power conversion system. The method includes measuring a motor speed of a motor, responsive to startup of a power conversion system, and performing a flying start operation using field weakening control to control the motor responsive to the motor speed exceeding a non-zero threshold at startup of the power conversion system.
摘要:
A motor control apparatus controls an induction motor to change from a free running state to a state in which a voltage applied to the induction motor and a frequency of the voltage satisfy a relationship. A voltage regulator executes a voltage increase mode to increase the voltage from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease the frequency from an upper limit of a second range over time. When a current through the induction motor exceeds a first threshold in the voltage increase mode, a mode changer changes to the frequency decrease mode. When the current through the induction motor becomes smaller than a second threshold smaller than the first threshold in the frequency decrease mode, the mode changer changes to the voltage increase mode. A determinator determines whether the voltage and the frequency satisfy the relationship.
摘要:
A failure in the activation, of a motor, caused by external noise superimposed on an induced voltage is reduced. A detection circuit (27) is connected to a connection node (cn3) provided between an upper-arm switching element (25w) and a lower-arm switching element (26w), and detects the induced voltage of a fan motor (77) before activation. The switching controller (28) activates the fan motor (77) in accordance with a result of detection by the detection circuit (27). While the detection circuit (27) detects the induced voltage, the switching controller (28) performs switching control which involves alternately turning ON and OFF of the lower-arm switching element (26w).
摘要:
An apparatus for restarting a medium voltage inverter is disclosed, wherein the medium voltage inverter can be restarted by estimating a rotor speed when an input power returns from an instantaneous defective state to a normal state, whereby a time to restart the medium voltage inverter can be reduced by a simple configuration to dispense with the need to wait until the rotor speed reaches zero speed.
摘要:
The present invention relates to a motor controller employing bootstrap-capacitor supplies and in particular to the situation where the bootstrap supplies have to be charged, while the motor controller is connected to a spinning and energized motor. The present invention introduces a method of recharging based on choosing a recharging sequence from a set of recharging sequences, where the choice depends on the state of the connected motor and in particular on the back-EMF voltages of the motor.
摘要:
Vorrichtung zur Zwischenspeicherung elektrischer Bremsenergie eines an einem Wechselrichter mit Zwischenkreis betriebenen Motors, umfassend einen Wechselrichter, einem Zwischenkreis und eine Energiespeichereinrichtung, wobei der Zwischenkreis (6) einen Zwischenkreiskondensator (8) umfasst, der parallel zum Wechselrichter (5) angeordnet ist, der Wechselrichter (5) zum Anschluss an den Motor (2) eingerichtet ist und zwischen dem Motor (2) und dem Zwischenkreis (6) angeschlossen ist, und der Wechselrichter (5) einen Rückspeisezustand aufweist, in dem Energie von dem Wechselrichter (6) in den Zwischenkreiskondensator (8) des Zwischenkreises (6) übertragen wird, die Energiespeichereinrichtung (9) einen Energiespeicher (11), eine Erfassungseinheit (14) und eine Steuerelektronik (13) umfasst, und wobei die Erfassungseinheit (14) den Rückspeisezustand des Wechselrichters (5) erkennt, und die Steuerelektronik (13) beim Erkennen des Rückspeisezustands einen Schalter (21) der Energiespeichereinrichtung (9) derart in eine Energieaufnahmestellung schaltet, dass der Energiespeicher (11) parallel zu dem Zwischenkreiskondensator (8) geschaltet wird und der Energiespeicher (11) Energie aus dem Zwischenkreis (6) aufnimmt.
摘要:
Method of and system for controlling the restart of an A.C. motor drive comprising an A.C. motor (4), a power converter (20, 21, 22) for stepless speed control of the A.C. motor and a load switch (3) arranged between the power converter and the A.C motor, wherein when the power converter (20, 21, 22) detects the output current to go below a predefined limit during the load switch opening it goes to a continuous output sensing mode, and when the output current goes above a predefined limit during the output sensing mode the power converter restarts automatically to a desired operating state.
摘要:
A method and system for controlling a power converter coupled to a polyphase power line. The method includes measuring at least two motor phase currents, obtaining a floating reference frame for the current Park vector, adjusting the reference frame based on an estimated rotor speed, and controlling the power converter via the floating reference frame to reinitiate power to a motor while a rotor is still moving.