Temic Telefunken Microelectronic Gmbh

Kurt Kleiner

Wolfgang Schulter

Erwin Kessler

Dieter Driendl

Stephan Kimpfler

A method is presented for detecting the position and the direction of motion of a movably mounted part on an electric motor that makes provision not only for a single-channel sensor but also a measuring arrangement for the motor current and the rectified motor current by means of which the motor current is activated after operating switching devices to reverse the polarity of the voltage applied to the motor to cause a reversal of the direction of motion. The measuring arrangement establishes from the variation of the motor current over time the point of time of the motor current maximum and transmits this to the evaluation logic. The point of time of the actual reversal of the direction of motion is derived from the point of time of the motor current. Preferably, the current is measured as a reference current value even before falling through the zero crossing. By means of a calculating unit that simulates a motor state model, the measured values of motor current, motor voltage and motor speed can also be used to ascertain by calculation the time of reversal of the direction of motion and the current threshold value.

Method for detecting the position and direction of motion of a moving part mounted on an electric motor

A tunable digital filter arrangement realizes the difference equation

Tunable digital filter arrangement

A process for controlling the closing movement of closing mechanisms with at least one electromotive part includes the following features to guarantee squeeze protection: the measured values of at least one motor performance characteristic which characterizes the load on the electric motor, are continuously recorded and evaluated, a continuously adapted tripping threshold defining a squeezing incident is specified for each motor performance characteristic, the measured values of each motor performance characteristic are compared with each tripping threshold and, if the tripping threshold is exceeded by at least one measured value, a defined reaction is initiated from the closing mechanisms. Immediately after the start of the closing movement, the starting behavior of the closing mechanism in the starting phase of the electric motor is defined with regard to equalization of drive play and sluggishness of the closing mechanism with reference to measured values of at least one motor performance characteristic relevant to the closing distance. This means that squeeze protection can be activated in the starting phase, relevant to the response relevant to the closing distance of at least one motor performance characteristic, when an activation value relevant to the closing distance is reached. Once squeeze protection has been activated in the starting phase, this additional response of at least one motor performance characteristic relevant to the closing distance is specified up to achieving uniform motion of the electromotive part, taking into consideration the measured values of at least one motor performance characteristic(s) of the previous and current closing movement and the tripping threshold of at least one motor performance characteristic is defined relevant to the given additional response of each motor performance characteristic relevant to the closing distance.

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Messkirch, Germany

Kurt Kleiner