摘要:
The maximum frequency and the minimum frequency are extracted from frequencies corresponding to respective axle speeds. The minimum frequency is subtracted from the maximum frequency to achieve a first frequency deviation, and also the first frequency deviation is input as a primary delay system to achieve a second frequency deviation. Furthermore, the second frequency deviation is subtracted from the first frequency deviation to achieve an idle running detection setting deviation, and also an idle running detection set value for judging the idle running of the wheels at the frequency level is achieved. The idle running frequency deviation and the idle running detection set value are compared with each other to output an idle running detection signal, and also a torque correction amount of an AC electric motor is calculated on the basis of the idle running detection signal.
摘要:
A controller for operating a variable speed alternating current motor using inverters to which power is supplied from two or more power supplies including an energy accumulator has a first inverter for converting direct current supplied from the outside into alternating current, a power supply for accumulating direct current, a second inverter for converting direct current supplied from the power supply into alternating current, and an adder for adding the alternating current voltages outputted from the first and second inverters.
摘要:
The vector control device includes: secondary magnetic flux command computing means (40) for computing a secondary magnetic flux command to an induction motor (6) by taking a maximum voltage that an inverter (4) can generate into account on a basis of a torque command from an external, a DC voltage to be inputted into the inverter, and an inverter angular frequency, which is an angular frequency of an AC voltage to be outputted from the inverter; q-axis/d-axis current command generating means (8 and 9) for generating a q-axis current command and a d-axis current command on a d-q axes rotating coordinate system in reference to a secondary magnetic flux of the induction motor (6) on a basis of the torque command and the secondary magnetic flux command; output voltage computing means (voltage non-interference computation portion 14, adder 17, and adder 18) for computing an output voltage that the inverter (4) is to output on a basis of the q-axis current command, the d-axis current command, and a circuit constant of the induction motor (6); and voltage command/PWM signal generating means (50) for controlling the inverter (4) for the inverter (4) to output the output voltage.
摘要:
A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter reactor provided between the filter capacitor and an overhead line, an overhead line voltage measuring instrument that measures a voltage value of the overhead line, a voltage increase detection unit that senses an amount of voltage increase occurring when, with an overhead line voltage being supplied, the overhead line voltage goes beyond a reference voltage value and rises at a rate equal to or higher than that by a predetermined time constant. A correction torque command value calculation unit calculates a correction torque command value that is corrected so that a torque command value to be received from an external unit becomes smaller for a predetermined time elapsing after the voltage increase detection unit has sensed, during regeneration operation of the inverter, an amount of voltage increase more than a predetermined range. A vector control unit controls the inverter so that the AC rotating machine develops torque coincident with the correction torque command value.
摘要:
A braking device that calculates an electric braking force command according to the braking command and generates a mechanical braking command, and a control circuit that calculates an electric braking force based on the electric braking force command from the device and the braking command and controls the power converter, are provided. The control circuit includes a control calculating unit that calculates the electric braking force and controls the converter, a virtual braking force calculating unit that calculates a virtual braking force to complement the electric braking force when starting braking, based on the braking command and an output of a voltage sensor for detecting an input voltage to the converter, and an adder that adds a calculation output of the control calculating unit and a calculation output of the virtual braking force calculating unit. The braking command from the device is changed according to an output of the adder.
摘要:
The vector control device includes: secondary magnetic flux command computing means (40) for computing a secondary magnetic flux command to an induction motor (6) by taking a maximum voltage that an inverter (4) can generate into account on a basis of a torque command from an external, a DC voltage to be inputted into the inverter, and an inverter angular frequency, which is an angular frequency of an AC voltage to be outputted from the inverter; q-axis/d-axis current command generating means (8 and 9) for generating a q-axis current command and a d-axis current command on a d-q axes rotating coordinate system in reference to a secondary magnetic flux of the induction motor (6) on a basis of the torque command and the secondary magnetic flux command; output voltage computing means (voltage non-interference computation portion 14, adder 17, and adder 18) for computing an output voltage that the inverter (4) is to output on a basis of the q-axis current command, the d-axis current command, and a circuit constant of the induction motor (6); and voltage command/PWM signal generating means (50) for controlling the inverter (4) for the inverter (4) to output the output voltage.
摘要:
A vector controller for an induction motor that conducts vector control by computing a d-axis current command value, a q-axis current command value, and a slip angular frequency command value based on a torque command value, a secondary magnetic flux command value, and aN induction motor constant has circuitry for automatically adjusting a correction value of secondary resistance. A secondary resistance correction value computing unit 10 calculates a secondary resistance correction value by using d-axis and q-axis feed-forward voltage command values, d-axis and q-axis voltage command values, a torque current command value, and a magnetic flux current command value. A vector control command computing unit 1 uses the computed secondary resistance correction value to carry out vector control of an induction motor.
摘要:
An electric vehicle controller includes a speed sensorless vector controller for estimating the rotating speed of an AC motor from an output voltage command and an output current from a VVVF inverter, and controlling the VVVF inverter based on the estimate. An overhead wire current detector detects the current flowing through an overhead wire. A wrong action sensor senses an abnormality in the speed sensorless vector controller from the sign of the current flowing through the overhead wire and detected by the overhead wire current detector when the VVVF inverter is in operation. A gate stop circuit stops the VVVF inverter when the wrong action sensor senses an abnormality.
摘要:
An object of the present invention is to provide an electric vehicle control device which is capable of detecting even a state in which only one phase of one induction motor is disconnected in a system where a plurality of induction motors are connected in parallel with each other and driven by one vector-controlled inverter device. The electric vehicle control device according to the present invention includes a torque calculation unit (5) for calculating the torque of the induction motor on the basis of a q-axis current I1q, a d-axis current I1d, a q-axis voltage command E1qr, a d-axis voltage command E1dr, and an inverter angular frequency ωinv, which are obtained by a vector control unit (2), a torque variation width calculation unit (6) that calculates the torque variation width from a maximum value and a minimum value of a torque calculation result in a predetermined time width on the basis of the torque calculation result, and a comparator (7) that outputs a disconnection detection signal when the torque variation width exceeds the torque variation width reference value.
摘要:
A control apparatus and braking control method for an electric vehicle is provided in which there is little response delay to a braking force command from a driver's seat even in a state where a regenerative load is small. A braking device that calculates an electric braking force command in accordance with the braking command and generates a mechanical braking command, and a control circuit that calculates an electric braking force on the basis of the electric braking force command from the braking device and the braking command and controls the power converter, are provided. The control circuit includes a control calculating unit that calculates the electric braking force and controls the power converter, a virtual braking force calculating unit that calculates a virtual braking force to complement the electric braking force when starting braking, on the basis of the braking command and an output of a voltage sensor for detecting an input voltage to the power converter, and an adder that adds a calculation output of the control calculating unit and a calculation output of the virtual braking force calculating unit. The mechanical braking command from the braking device is changed in accordance with an output of the adder.