Abstract: A method for controlling a machine with at least one inverter-operated electric drive unit includes determining the instantaneous mains frequency of the mains supply to the machine and a deviation of the determined mains frequency over a standard frequency of the mains supply, determining a frequency correction value for adjusting the target drive frequency at which the electric motor of the machine is operated by weighting the deviation with a factor k, the factor k being specified dynamically as a function of at least one process variable of the drive load and/or of the operated drive process, and operating the machine at the adjusted target frequency.

Abstract: A method for controlling a machine with at least one inverter-operated electric drive unit includes determining the instantaneous mains frequency of the mains supply to the machine and a deviation of the determined mains frequency over a standard frequency of the mains supply, determining a frequency correction value for adjusting the target drive frequency at which the electric motor of the machine is operated by weighting the deviation with a factor k, the factor k being specified dynamically as a function of at least one process variable of the drive load and/or of the operated drive process, and operating the machine at the adjusted target frequency.

Abstract: A displacement pump arrangement, method for operating the displacement pump arrangement and a control device for controlling the displacement pump arrangement provide rotational-speed-variable control of an expeller pump unit for feeding a fluid. The arrangement includes an expeller pump and a drive, the drive being composed of an electric drive motor and a frequency converter, and a control device. The control device controls a state value such as a final pressure of the expeller pump a setpoint value. The control device detects state values of a control variable are supplied by the drive, in particular relating to the position, rotational speed and torque of the drive motor, and adjusts the displacement pump output to reach the setpoint value without using sensors.

Abstract: A rotor for a reluctance machine is provided. The rotor includes a cylindrical soft-magnetic element having cutouts for forming magnetic flux barriers. Some or all of the flux barriers are divided by one or more webs, with the profile of the individual webs forming a closed line which divides the rotor in the radial direction into an inner and an outer region. The cut-outs may be partially or fully filled with a a paramagnetic or diamagnetic filler material.

Abstract: A rotor for a reluctance machine and a method of producing a rotor for a reluctance machine is provided. The rotor is formed as a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses for forming flux barriers, one or more flux barriers being at least partially filled with a filler material, and the filler material of said flux barriers extending up to the rotor periphery and forming part of the rotor periphery.

Abstract: The invention relates to a method for determining the delivery rate of a pump. In this context, a value of the delivery level and a value of the power of the pump are determined. A probability density function is calculated for the delivery level and the power. A first probability density function of the delivery rate is calculated on the basis of a delivery level-delivery rate relationship and the probability density function of the delivery level. A second probability density function of the delivery rate is determined on the basis of a power-delivery rate relationship and the probability density function of the power. A combined probability density function of the delivery rate is determined on the basis of the first and second probability density functions. The delivery rate is determined on the basis of the combined probability density function.

Abstract: A rotor for a reluctance machine is provided. The rotor includes a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses forming flux barriers. At least part of the recesses are filled with an electrically conducting and magnetically non-conducting filler material such that a starting cage is formed in a peripheral region of the rotor. The ratio of the surface of the filled region of the flux barriers to the surface of the region of the unfilled flux barriers is at least 0.2 for at least one rotor cycle.

Abstract: A method and apparatus for controlling the motor of a synchronous reluctance motor for a pump, in particular a centrifugal pump, are provided. The motor includes a variable-frequency drive which controls the synchronous reluctance motor in a terminal volts/hertz operation. The pump, in particular a centrifugal pump, includes at least one synchronous reluctance motor and a variable-frequency drive for a motor control, the variable-frequency drive being a terminal volts/hertz variable-frequency drive.

Abstract: A rotor for an electrical machine, in particular synchronous reluctance machine, is provided. The rotor is formed as a cylindrical structure having a magnetically soft element formed with an even number of salient magnetic poles openings for forming magnetic flux barriers. The openings are at least partially filled with a diamagnetic and/or paramagnetic medium and the diamagnetic and/or paramagnetic medium may axially and tangentially fix the magnetically soft element relative to the rotor. A method for producing such a rotor and apparatus using the rotor, including a reluctance motor, in particular a synchronous reluctance motor, that uses the rotor are provided.

Abstract: A rotor for a reluctance machine and a method of producing a rotor for a reluctance machine is provided. The rotor is formed as a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses for forming flux barriers, one or more flux barriers being at least partially filled with a filler material, and the filler material of said flux barriers extending up to the rotor periphery and forming part of the rotor periphery.

Abstract: A method for producing a rotor for a reluctance machine, in particular for a synchronous reluctance machine, and a rotor produced by the method, are provided. The laminated rotor core is produced by punching and stacking two or more adjacent laminations of the core. The adjacent laminations are held together by at least one connection point created during the punch stacking, the at least one connection point simultaneously forming a flux barrier of the rotor. The rotor comprises a laminated core, which is stacked from at least two lamination sheets, with the at least two adjacent lamination cuts being connected to each other by at least one connection point forming at least one flux barrier of the rotor.

Abstract: A rotor for a reluctance machine is provided. The rotor includes a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses forming flux barriers. At least part of the recesses are filled with an electrically conducting and magnetically non-conducting filler material such that a starting cage is formed in a peripheral region of the rotor. The ratio of the surface of the filled region of the flux barriers to the surface of the region of the unfilled flux barriers is at least 0.2 for at least one rotor cycle.

Abstract: A method and apparatus for controlling the motor of a synchronous reluctance motor for a pump, in particular a centrifugal pump, are provided. The motor includes a variable-frequency drive which controls the synchronous reluctance motor in a terminal volts/hertz operation. The pump, in particular a centrifugal pump, includes at least one synchronous reluctance motor and a variable-frequency drive for a motor control, the variable-frequency drive being a terminal volts/hertz variable-frequency drive.

Abstract: The invention relates to a method for determining the delivery rate of a pump. In this context, a value of the delivery level and a value of the power of the pump are determined. A probability density function is calculated for the delivery level and the power. A first probability density function of the delivery rate is calculated on the basis of a delivery level-delivery rate relationship and the probability density function of the delivery level. A second probability density function of the delivery rate is determined on the basis of a power-delivery rate relationship and the probability density function of the power. A combined probability density function of the delivery rate is determined on the basis of the first and second probability density functions. The delivery rate is determined on the basis of the combined probability density function.

Abstract: The invention relates to a method for starting a variable-speed electric motor, wherein upon detection of locking of the motor shaft a positive torque is applied to the motor shaft, and wherein the positive torque is continuously modified with different frequencies to overcome the locking.

Abstract: The invention relates to a method for starting a variable-speed electric motor, wherein upon detection of locking of the motor shaft a positive torque is applied to the motor shaft, and wherein the positive torque is continuously modified with different frequencies to overcome the locking.

Abstract: A rotor for a reluctance machine is provided. The rotor includes a cylindrical soft-magnetic element having cutouts for forming magnetic flux barriers. Some or all of the flux barriers are divided by one or more webs, with the profile of the individual webs forming a closed line which divides the rotor in the radial direction into an inner and an outer region. The cut-outs may be partially or fully filled with a a paramagnetic or diamagnetic filler material.

Abstract: A rotor for an electrical machine, in particular synchronous reluctance machine, is provided. The rotor is formed as a cylindrical structure having a magnetically soft element formed with an even number of salient magnetic poles openings for forming magnetic flux barriers. The openings are at least partially filled with a diamagnetic and/or paramagnetic medium and the diamagnetic and/or paramagnetic medium may axially and tangentially fix the magnetically soft element relative to the rotor. A method for producing such a rotor and apparatus using the rotor, including a reluctance motor, in particular a synchronous reluctance motor, that uses the rotor are provided.

Abstract: A displacement pump arrangement, method for operating the displacement pump arrangement and a control device for controlling the displacement pump arrangement provide rotational-speed-variable control of an expeller pump unit for feeding a fluid. The arrangement includes an expeller pump and a drive, the drive being composed of an electric drive motor and a frequency converter, and a control device. The control device controls a state value such as a final pressure of the expeller pump a setpoint value. The control device detects state values of a control variable are supplied by the drive, in particular relating to the position, rotational speed and torque of the drive motor, and adjusts the displacement pump output to reach the setpoint value without using sensors.