Patents by Inventor Bernhard Piepenbreier

Bernhard Piepenbreier has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Converter motor with an energy recovery capability
    Publication number: 20010021116
    Abstract: The present invention relates to a converter motor with an energy recovery capability, comprising a motor and a self-commutating direct converter, the use of which results in a compact converter motor with an energy recovery capability, which can be used as a four-quadrant drive.
    Type: Application
    Filed: March 8, 2001
    Publication date: September 13, 2001
    Applicant: SIEMENS AG.
    Inventors: Manfred Bruckmann, Bernhard Piepenbreier, Walter Springmann
  • Polyphase machine fed by a pulse-controlled a.c. converter
    Patent number: 5034675
    Abstract: A polyphase machine fed by a pulse-controlled a.c. converter in which the current is controlled between rectangular and sine-shaped waveforms in each half cycle according to the required torque. Independently of the current control, the active number of phase windings is reduced as a function of the rotational speed of the machine.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: July 23, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventors: Georg Nerowski, Bernhard Piepenbreier, Hans-Juergen Toelle
  • Electrical machine driven by a pulse-controlled a.c. converter
    Patent number: 4906911
    Abstract: An electrical machine driven by a pulse-controlled a.c. converter contains multiple phases subdivided into a number of n.gtoreq.2 equivalent phases sections that are extensively magnetically decoupled relative to each other. Each phase section is fed by a separate frequency converter. The clocking of the frequency converters for the n phase sections ensues out of phase by an angle of 2.pi./n relative to each other phase section.
    Type: Grant
    Filed: March 2, 1989
    Date of Patent: March 6, 1990
    Assignee: Siemens Aktiengesellschaft
    Inventors: Georg Nerowski, Bernhard Piepenbreier, Hans-Juergen Toelle
  • Short-circuit protection device for an electrical machine fed by a pulse-controlled A.C. converter
    Patent number: 4890181
    Abstract: A short-circuit protective device for a motor-driven and generator-driven electrical machine fed by a pulse-controlled a.c. converter has reverse-parallel circuitry that is switching dependent on a monitoring device. The monitoring device detects short circuits and is provided in a d.c. current supply line. Using the reverse-parallel circuitry and the monitor, an intermediate circuit capacitor of the pulse-controlled a.c. converter feeding the machine is isolated from the short circuit location.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: December 26, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Georg Nerowski, Bernhard Piepenbreier, Hans-Juergen Toelle