Siemens Aktiengesellschaft

Other

Weg S.a.

Joachim Holtz

Theodor Salzmann

Jinsheng Jiang

Samir Salama

Paulo Jose Torri

Nikolaos Dr-Ing Oikonomou

Gilberto Da Cunha

Till Boller

Akshay Kumar Rathore

A method and a control device for braking a variable speed vector controlled induction machine are driven by a pulse width modulation (PWM) inverter, in which the q-current component and the d-current component of the stator current are controlled independently from one another in accordance with a first reference signal (i,*) and a second reference signal (i,*), respectively. For braking, high frequency components are superimposed on the second reference signal (i,*), and the root-mean-square (rms) value (i,) and the average value (i,) of the resultant second reference signal are controlled independently from one another such that the field requirements are met by the average value and high machine losses are produced by the rms value.

Method of braking a vector controlled induction machine, control device for carrying out the method and storage medium

A three-level inverter, in which the upper and lower half of each phase relieves the semiconductor switching elements from excessive values of the rate of rise of the recurring positive forward blocking voltage. This is done with a circuit arrangement in each half has a wiring diode, a switching off relief capacitor, a further wiring diode, a storage capacitor and a discharging resistor serving as the d-c load. Additional energy feedback devices feed back, into the supplying d-c voltage source, energy which is produced in the switching-off process and is temporarily stored in the circuitry.

Switching-relieved low-loss three-level inverter

The invention relates to a circuit arrangement for use with a trackbound propulsion vehicle. The circuit arrangement includes a traveling-field winding which is installed alongside the vehicle roadbed and forms the stator of a linear synchronous motor whose exciter is disposed as a co-movable translator on the vehicle itself. More particularly, in order to be able to accelerate the propulsion vehicle with constant driving power, in accord with the invention, the traveling-field winding is designed such that the number of conductors per pole and phase thereof are inversely proportional to a pre-determined vehicle velocity.

Circuit arrangement for a track-bound propulsion vehicle

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Wuppertal, Germany

Joachim Holtz