摘要:
A galvanically isolated DC/DC converter (2) comprises at least one first side converter circuit (20) coupled between a pair of first side DC terminals (10), the first side converter circuit (20) having at least a first and a second switching element (20a, 20b), with each of the first and second switching elements (20a, 20b) comprising a switch (22, 24) and a diode (23, 25) connected in parallel, and at least one second side converter circuit (40) coupled between a pair of second side DC terminals (60), wherein, when the DC/DC converter (2) is in power transfer operation from the pair of second side DC terminals (60) to the pair of first side DC terminals (10), the second side converter circuit (40) is adapted to alternate between two power transfer states, wherein a conductive state of the diode of one of the first and second switching elements (20a, 20b) is the result of one of the two power transfer states, with the first side converter circuit (20) being controlled such that the switch of the respectively other of the first and second switching elements (20a, 20b) is closed for an adaptation interval (T P ) prior to a beginning of the one of the two power transfer states.
摘要:
A method of controlling a DC/AC converter (2) comprises the steps of (a) providing a desired AC side reference value (VAmp); (b) setting a reference correction value (VAmp,corr,1); (c) calculating an AC side reference signal (VAC,set,1) as a function of the desired AC side reference value (VAmp) and the reference correction value (VAmp,corr,1); (d) obtaining an actual AC side signal (VAC,Act,1); and (e) calculating a converter control signal (MAC,1) as a function of the AC side reference signal (VAC,Set,1) and the actual AC side signal (VAC,Act,1); wherein the setting of the reference correction value (VAmp,corr,1) is based on a relation of the desired AC side reference value (VAmp) and the actual AC side signal (VAC,Act,1).
摘要:
An electric machine comprises a rotor (200) equipped with permanent magnets (204, 206, 208, 210), and a stator (100) equipped with electromagnetic poles. The electric machine is characterized in that several adjacent electromagnetic poles respectively constitute an electromagnetic pole group in which the adjacent electromagnetic poles are spaced apart at a first electromagnetic pole spacing, that adjacent electromagnetic poles belonging to different electromagnetic pole groups are spaced apart at an electromagnetic pole spacing greater than said first electromagnetic pole spacing, that each electromagnetic pole group has an even number of electromagnetic poles, and that adjacent electromagnetic poles of an electromagnetic pole group are linked to each other so as to generate magnetic fields of opposite direction in operation.
摘要:
The present invention relates to a power electronics unit (10) for driving an electrical machine with permanent-magnet excitation and comprising a rotor and a stator which has at least one stator winding (12A, 12B, 12C), having at least one circuit breaker (30A, 32A, 30B, 32B, 30C, 32C) which is designed to drive the stator winding (12A, 12B, 12C), and an overvoltage protection device for protecting the circuit breaker (30A, 32A, 30B, 32B, 30C, 32C) against overvoltage. The overvoltage protection device has a phase voltage detection device (38A, 38B, 38C), which is associated with the circuit breaker (30A, 32A, 30B, 32B, 30C, 32C), and also a short-circuit switching device which, when a prespecified phase voltage threshold value of the phase voltage which is detected by the phase voltage detection device (38A, 38B, 38C) is reached or exceeded, can be activated for short-circuiting the stator winding (12A, 12B, 12C) which is associated with the circuit breaker (30A, 32A, 30B, 32B, 30C, 32C). The short-circuit switching device has the circuit breaker (30A, 32A, 30B, 32B, 30C, 32C) which is designed for driving the stator winding (12A, 12B, 12C).
摘要:
An electric machine comprises a rotor (200) equipped with permanent magnets (204, 206, 208, 210), and a stator (100) equipped with electromagnetic poles. The electric machine is characterized in that several adjacent electromagnetic poles respectively constitute an electromagnetic pole group in which the adjacent electromagnetic poles are spaced apart at a first electromagnetic pole spacing, that adjacent electromagnetic poles belonging to different electromagnetic pole groups are spaced apart at an electromagnetic pole spacing greater than said first electromagnetic pole spacing, that each electromagnetic pole group has an even number of electromagnetic poles, and that adjacent electromagnetic poles of an electromagnetic pole group are linked to each other so as to generate magnetic fields of opposite direction in operation.
摘要:
A permanent magnet excited electric machine includes a stator and a moving part movable relative to the stator. One of the stator and moving part has an electric winding system in the form of a single or multiple 3-phase system. The other one of the stator and moving part has permanent magnets. The winding system, in the form of a delta connection, has an inductance such that the related total reactance xB during rated operation according to xB=ωB·LY·PB/(Z3P·Ui,B2) is at least 0.8, wherein ωB is the electric angular frequency of the winding system during rated operation, LY is the phase inductance of the winding system in star connection, PB is the power of the machine during rated operation, Z3P is the number of 3-phase systems of the machine, and Ui,B is the amount of the induced conductor voltage during rated operation.