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 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.
Abstract:
Die Erfindung betrifft ein Verfahren zur Messung eines Leitungswiderstandes R L (7) und somit zur Bestimmung von Störungen von Steuerleitungen (16) in einem Gefahrenmelde- und Steuerungssystem, wobei die Steuerleitungen (16) eine Steuerungsvorrichtung (20) mit einem Aktor (10) verbinden und die Steuerungsvorrichtung (20) im Ereignisfall den Aktor (10) mit einer Ansteuerspannung U A ansteuert, und am oder im Aktor (10) ein Überwachungsmodul (21) am Ende der Steuerleitungen (16) angeordnet ist, wobei ferner die Steuerungsvorrichtung (20) eine über einen Mikrocontroller (1) zuschaltbare Konstantstromsenke (6) oder einen zuschaltbaren Lastwiderstand und eine Umschaltvorrichtung (5) aufweist und der Anfang der Steuerleitungen (16) an der Steuerungsvorrichtung (20) angeordnet ist. Das Verfahren ist dadurch gekennzeichnet, dass für die Bestimmung des Leitungswiderstandes R L (7) eine konstante Spannungsversorgung in einem Messzeitintervall Δt M durch einen im Überwachungsmodul (21) integrierten Energiespeicher (9) bereitgestellt wird und im gesamten Messzeitintervall Δt M schaltet die Umschaltvorrichtung (5) die Spannungsversorgung des Aktors (10) von Seiten der Steuerungsvorrichtung (20) ab. Weiterhin betrifft die Erfindung eine Vorrichtung zur Messung eines Leitungswiderstandes R L (7) von Störungen von Steuerleitungen (16).
Abstract:
A method for driving an electric motor includes providing two controllers for driving the electric motor. The two controllers use different control methods to drive the electric motor. The method further includes selecting a first controller of the controllers as a primary controller to drive the electric motor and a second controller of the controllers as a secondary controller, monitoring a control of the electric motor, and switching the control of the electric motor from the primary controller to the secondary controller if an error condition is detected in the control of the electric motor.
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 drive system for an electrical load such as an electric motor or generator comprises a PWM converter and a controller therefore. A signal indicative of a condition of the converter outpost is used in a controller to drive an optimal value of PWM switching frequency based on a load characteristic that is used to control the pulse switching frequency. The system takes account of the overall system in deriving an efficient PWM switching frequency.
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 drive system for an electrical load such as an electric motor or generator comprises a PWM converter and a controller therefore. A signal indicative of a condition of the converter outpost is used in a controller to drive an optimal value of PWM switching frequency based on a load characteristic that is used to control the pulse switching frequency. The system takes account of the overall system in deriving an efficient PWM switching frequency.