Abstract:
A reactor capable of eliminating a heat source provided within a power cabinet housing a motor drive device. The reactor includes a tubular core, a coil installed inside the core, a terminal which is provided at an axially first end of the core and which is connected to the coil, and an attachment flange which extends radially outside of the core and which is provided between the terminal and a second end of the core.
Abstract:
A cooling structure of a capacitor includes a snubber capacitor in which lead terminals are joined to external electrodes of a laminated ceramic electronic component; a circuit board which is for mounting the snubber capacitor and semiconductor switching elements; and a heat dissipation plate which is made of metal that dissipates the heat generated in the circuit board. The cooling structure of the capacitor is configured such that an insulating member having a high coefficient of thermal conductivity intervenes between the snubber capacitor and the heat dissipation plate.
Abstract:
A method for measuring a line resistance RL (7) and determining control line (16) faults in a hazard warning and control system. The control lines (16) connect a control device (20) to an actuator (10) using an actuation voltage UA in the case of an event and supplies the actuator (10) with a monitoring voltage UM in the case of a monitoring process using a monitoring module (21). Furthermore, the control device (20) has a constant current sink (6), which can be activated by a microcontroller (1), and a switchover device (5). In order to determine the line resistance RL (7), a constant voltage supply is provided in a measurement time interval ΔtM by an energy store (9) integrated into the monitoring module (21) and is fed back to the control device (20), and the switchover device (5) deactivates the monitoring voltage UM supply from the control device (20) to the actuator (10) during the entire measurement time interval ΔtM.
Abstract:
A wind power generation system 100, 300 including a doubly fed induction generator DFIG 102, 204 of a wind turbine is presented. The DFIG 102, 204 includes a rotor 103, 201 and a stator 101, 203, a rotor-side conversion unit 104, 208 coupled to the rotor, a direct current DC link 108, 209, and at least one line-side conversion unit 106, 210, 210', 210" coupled to the rotor-side conversion unit via the DC link and coupled to the stator of the DFIG. The at least one line-side conversion unit includes exactly one first converter 212, high frequency transformers 214, and second converters 216, where each of the second converters is coupled to the first converter via a respective high frequency transformer, and inverters 218, where each of the inverters is coupled to a respective second converter and includes an alternative current AC phase terminal 222, 224, 226.
Abstract:
A motor driving device according to the present invention includes: a PWM duty ratio detecting unit for detecting a target rotational speed based on a duty ratio of a PWM signal input from a host system; a PWM period detecting unit for detecting a period of the PWM signal; a PWM period error calculating unit for calculating an error between a PWM period output from the PWM period detecting unit and a PWM period previously set as a reference calculated by using the operational clock generator; a position detecting sensor for detecting a permanent magnet of the rotor; and an actual rotational speed calculating unit for calculating an actual rotational speed of the rotor by using a signal output from the position detecting sensor. The present motor driving device controls a speed while correcting the actual rotational speed based on the PWM period error.
Abstract:
A differential amplifier generates an offset correction signal based on a rotation detection signal from a rotation detector apparatus and an offset signal. A comparator compares the offset correction signal with a threshold voltage, and outputs a binarized signal representing the comparison result. An average value signal generator circuit generates an average value signal representing the average value of the offset correction signal. The offset signal generator circuit generates the offset signal so that the signal voltage of the average value signal has a voltage value between a threshold voltage and a threshold voltage.