摘要:
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.
摘要:
The invention relates to a method for determining the rotational position of the drive shaft of a direct current motor by evaluating the current fluctuations contained in the armature current signal. The method is characterised in that if the electric connection between the direct current motor and the evaluation electronic system is interrupted, an approximate determination of the value of the rotational angle covered during the run-down of the direct current motor armature is calculated by the determination of the number of estimated current fluctuations that are expected.
摘要:
The invention relates to a method for providing a digital current fluctuation signal from the analogue armature current signal of a direct current motor that is supplied with current. The method is characterised in that, • the analogue armature current signal after being filtered is subjected to an analogue/digital conversion, based on a threshold value, • the analogue armature current signal is oversampled at a predetermined clock pulse rate during the start-up phase when the direct current motor is switched on and during the run-down phase when the motor is switched off, said oversampling being predominantly limited to these phases and • the current fluctuation(s) determined from the analogue/digital conversion based on a threshold value is/are compared with the current fluctuation(s) determined from the oversampling. If the respective current fluctuations that have been determined do not sufficiently correspond, the current fluctuations that have been determined from the oversampling are considered for further evaluation.
摘要:
The invention relates to a method for providing a digital current fluctuation signal from the analogue armature current signal of a direct current motor that is supplied with current. The method is characterised in that, • the analogue armature current signal after being filtered is subjected to an analogue/digital conversion, based on a threshold value, • the analogue armature current signal is oversampled at a predetermined clock pulse rate during the start-up phase when the direct current motor is switched on and during the run-down phase when the motor is switched off, said oversampling being predominantly limited to these phases and • the current fluctuation(s) determined from the analogue/digital conversion based on a threshold value is/are compared with the current fluctuation(s) determined from the oversampling. If the respective current fluctuations that have been determined do not sufficiently correspond, the current fluctuations that have been determined from the oversampling are considered for further evaluation.
摘要:
The invention relates to a method for determining the rotational position of the drive shaft of a direct current motor by evaluating the current fluctuations contained in the armature current signal. The method is characterised in that if the electric connection between the direct current motor and the evaluation electronic system is interrupted, an approximate determination of the value of the rotational angle covered during the run-down of the direct current motor armature is calculated by the determination of the number of estimated current fluctuations that are expected.
摘要:
The invention relates to a method for moving an element, which is driven by an electric motor inside a predetermined movement section between two block positions each formed as a limit stop, into a block position, characterized in that, when moving the driven element into at least one of the two block positions, the motor current of the electric motor is continuously reduced over a preset period to zero after reaching the mechanically defined block position by the pulse width-modulated switching of the supply voltage of the electric motor at a decreasing pulse-pause ratio.
摘要:
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.
摘要:
The invention relates to a method for determining the position of an element driven by the 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 defined block position, a normalization is carried out by the system. The method is characterised in that whilst the driven element is being manoeuvred into a block position, the current supply to the motor is interrupted before the block position defined by the system has been attained, that after a predetermined time-period the current is actively re-supplied to the direct current motor for the final manoeuvring of the driven element into the block position and that once the driven element has assumed its mechanically defined block position, a normalization of said block position is carried out by the system.