Abstract:
Es werden ein Verfahren zum Ansteuern eines Elektromotors und eine Schaltungsanordnung (100) zum Ansteuern eines Elektromotors beschrieben. Dabei sind in einem Signalauswertemodul (110) eine Anzahl von Ausgabemustern (130) abgelegt, wobei ein Eingabemuster (125) vorgegeben wird und in Abhängigkeit des Eingabemusters (125) eines der Ausgabemuster (130) ausgegeben wird, mit dem der Elektromotor angesteuert wird.
Abstract:
A motor control system (20) for a brushless and sensorless DC motor (22) for driving a compressor (28), pump or other application, includes a protection and fault detection circuit (42) for detecting a locked rotor (26) and a rotor which has stopped because of lost rotor phase lock. The motor control system also includes an off-theshelf motor control integrated circuit (40) having an input for disabling power outputs to the motor phase coils. The protection and fault detection circuit uses a back EMF sampling circuit (54) coupled to the motor phase coils (24a-24c) and momentarily disables power to the motor phase coils, via the motor control integrated circuit input, to determine if the motor rotor is rotating. The system also monitors supply voltage, supply current, temperature, and motor speed limits to detect faults and protect system components.
Abstract:
A motor control system accurately and reliably controls the speed of a motor (14) so that the motor (14) operates in accordance with a predetermined motor speed profile, and therefore does not exceed a predetermined safe speed, decelerates at a controlled rate, maintains a safe minimum speed, and does not turn in reverse. If the motor (14) operates out of these limits, a malfunction is indicated and the control system halts operation of the motor (487). The motor speed is determined using an electronic tachometer (18) that analyzes the current (66, 68, 70) in at least two phases of the motor (60, 62, 64) to provide extremely precise and reliable velocity information for the motor (14).
Abstract:
A microcomputer controlled power tool (10) including a semiconductor control device (64) connected to the motor (66), one or more sensors (36, 58), and a microcomputer (50) interfaced to a keyboard (28) and digital display (30) for monitoring and controlling various operating conditions and parameters of the power tool.
Abstract:
A control system for determining a line pull of a winch (600). The system comprises a first sensor (610) configured to measure a torque generated by the winch to retract a cable (634) and a second sensor (612) configured to measure a number of layers of the cable retracted by the winch, wherein a layer of the cable is formed by a single wrap of the cable onto a drum (602). The system further comprises a monitoring circuit (500, 580) coupled to the first and second sensors, wherein the monitoring circuit is configured to determine the line pull of the winch based on the torque generated by the winch and the number of layers of cable retracted onto the container.
Abstract:
Le procédé permet la commande et le contrôle du fonctionnement dynamique d'un actionneur destiné à entraîner un élément mobile d'une installation de protection d'un bâtiment. L'actionneur (1) est associé à des moyens rapprochés de pilotage comprenant, un dispositif d'alimentation ou convertisseur (5), une unité locale de traitement (10), et un transmetteur bidirectionnel radiofréquences (4), constituant une unité locale d'actionnement (100). Le procédé est caractérisé en ce qu'il consiste ô déporter vers une autre unité, dite unité déportée de traitement (400), tout ou partie du traitement d'analyse de mesures relatives audit actionneur (1) et/ou audit élément mobile (50).
Abstract:
The invention relates to an electronically commutable motor whose exciting windings, via semiconductor output stages, can be controlled by an electronic control unit using PWM control signals. A specified value can be given beforehand to the control unit and the control unit transmits corresponding PWM control signals to the semiconductor output stages. The aim of the invention to easily monitor the starting of the motor and to prevent an overloading. To these ends, a monitoring device, using the pre-assignment of the specified value and/or the switching on of the control unit and/or the semiconductor output stages, monitors whether the motor has reached a minimum rotational speed after the completion of a predetermined or predeterminable starting time, and the control unit and/or the semiconductor output stages can be switched off if the minimum rotational speed is not reached.
Abstract:
A device for monitoring the operation of a driving arrangement comprising at least a servo-mechanism (3), which includes a regulator (3a), a driving motor (5) controlled by this regulator and an element (6) which can be set in motion by the driving motor, a detection arrangement (19-22, 23) for detecting deviations between intended and actual movement positions of the element (6) and an operation inhibiting and/or alarming arrangement (23, 36, 37, 38) for inhibiting the operation of the driving arrangement and/or starting an alarm when impermissible deviations have been established by means of the detection arrangement. The device comprises a redundant driving arrangement, which comprises at least one auxiliary servomechanism (4) including a redundant regulator (4a), a redundant driving motor (7) controlled by this regulator and a redundant element (8) which can be set in motion by this driving motor, that the regulator (3a) and the redundant regulator (4a) are connected to an arrangement (2) delivering control information o or imparting to the element and the redundant element movements being the same or having a predetermined relation to each other, and that the detection arrangement is arranged to detect the deviations concerning the relative position or movements of the element (6), or an object (17) connected thereto, and the redundant element (8).
Abstract:
A mobile lift device having a load moving device capable of engaging a load is provided. The mobile lift device includes one or more systems for stabilizing the mobile lift device during operation of the load moving device. According to one exemplary embodiment, the mobile lift device is a heavy duty wrecker having a rotatable boom assembly. The heavy duty wrecker comprises a monitoring system for stabilizing the wrecker during operation of the boom assembly. The monitoring system comprises a plurality of sensors and a monitoring circuit coupled to the sensors to generate a force signal representative of at least one force being applied to the wrecker based upon the transmitted signals.
Abstract:
The invention relates to a method for determining the position of an element driven by the drive shaft of a direct current motor within a predetermined displacement trajectory between two block positions, by evaluating the current fluctuations contained in the armature current signal. According to said method, when the driven element is displaced into a block position, a normalization in relation to said block position is carried out. The method is characterised in that the direct current motor is triggered to manoeuvre the driven element into the block position when a signal for manoeuvring the driven element out of its block position is present and that the system carries out a normalization in relation to the current block position, when the driven element lies in the block position that has been determined, before the direct current motor is triggered to manoeuvre the displaceable element out of its block position, in accordance with the signal that is present.