Patent application number | Description | Published |
20090167222 | METHOD AND DEVICE FOR DETERMINING THE TORQUE OF AN ELECTRIC MACHINE - A method for determining the torque of an electric machine, in particular a permanently energized electric machine. The torque is determined by a particularly simple and accurate method by measuring a phase voltage and the rotational speed of the electric machine and calculating the torque based on these values. | 07-02-2009 |
20090174254 | PULSE-WIDTH MODULATION RECTIFIER HAVING AN EMERGENCY GENERATOR OPERATING MODE - A pulse-width rectifier for operating an electric machine in motor operating mode or in generator operating mode, includes a terminal for a control device that communicates with the pulse-width rectifier via a data connection. In order to safeguard the supply of energy in the case of a disturbance in the data transmission between the control device and the pulse-width rectifier, the pulse-width rectifier is constructed such that it automatically switches into an emergency generator operating mode in which it produces at its direct-voltage output a prespecified power with which it is possible to maintain at least an emergency operation of electrical consumers. | 07-09-2009 |
20090174351 | Method for Determining the Magnet Temperature in Synchronous Machines - A method for determining the magnet temperature of a permanent magnet electrical machine. The magnet temperature is able to be determined particularly simply and accurately if a phase voltage and the rotational speed of the electrical machine are measured, and the magnet temperature is determined from this. | 07-09-2009 |
20090302789 | Method for Identification of the Sensor Assignment within an Electrical Machine - A method for identifying the sensor assignment to the output signals of an electrical machine having at least two standardized sensor elements, that are assigned to a rotating body. An arbitrary signal sequence of sensor signals of the at least two standardized sensor elements is recorded for a first direction of rotation of the electrical machine. The arbitrary signal sequence is sorted with respect to the electrical angle φ of the electrical machine corresponding to an offset of the electrical angle φ per sensor signal. The zero crossings of phases of the electrical machine are assigned to the sensor signals. | 12-10-2009 |
20100194316 | Method and Device for Field-Oriented Regulation of a Polyphase Machine - A method and a device for field-oriented regulation of a polyphase machine. An actual torque of the polyphase machine is ascertained, the ascertained actual torque is compared with a setpoint torque, and in the event that torque differences occur, the setpoint values for the flow-forming current and the torque-forming current are modified to bring the actual torque into agreement with the setpoint torque. The actual torque is calculated with the aid of the power balance of the polyphase machine. | 08-05-2010 |
20110266985 | METHOD AND DEVICE FOR MONITORING THE STARTUP OF AN ELECTRIC DRIVE - A method and a device for monitoring the startup of an electric drive, which has a polyphase machine, a pulse-controlled inverter and a control unit. The control unit is provided to compare rotational speed values that are successive in time to one another during the startup of the drive, and when recognizing a non-increase in the rotational speed of the rotor shaft, to detect a mixup of phase lines or pulse-controlled inverter lines. | 11-03-2011 |
20130085635 | METHOD FOR DETERMINING A POWER LIMITING VALUE FOR AN ELECTRIC MACHINE IN A VEHICLE, COMPUTER PROGRAM AND CONTROL UNIT FOR CONTROLLING AN ELECTRIC MACHINE IN A VEHICLE - In a method for determining a power limiting value for an electric machine in a vehicle, the electric machine being assigned an energy storage device, an intermediate power value is calculated from a maximally allowable current of the energy storage device and an instantaneous voltage. A corrected intermediate power value is determined by adding at least one power loss to the intermediate power value. A first correction value is determined for reducing the absolute value of the corrected intermediate power value if an instantaneous power of the energy storage device is greater than the absolute value of the calculated intermediate power value. The power limiting value is determined by superimposing the first correction value on the corrected intermediate power value. | 04-04-2013 |
20130214714 | METHOD AND DEVICE FOR CONTROLLING A SYNCHRONOUS MACHINE - In a method for controlling a synchronous machine having a stator, a rotor, and magnets situated on the rotor, first a nominal value is set for the magnetic flux prevailing in the synchronous machine, and a marker is set in a control unit that indicates that no calibration has yet been carried out. It is then checked repeatedly whether the synchronous machine has been out of operation for at least a specified time duration. If this is the case, a temperature balance between the stator and the rotor is assumed, so that the temperature to be measured at the stator is equal to the rotor temperature, and thus can be used as a basis for a calibration of the magnetic flux. A marker that indicates the carrying out of a flux calibration is set in the control unit. Subsequently, normal operation can be continued. | 08-22-2013 |