Non-redundant safety monitoring for an electric drive mechanism (with a sensor)
AssigneeLenze Automation GmbH
InventorManfred Tinebor
Life of this patent
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Abstract
The invention relates to a method for detecting undesired operating conditions of a driving device. A sensor (50) that is transformer-coupled between a stator side and a rotor side is triggered by a control circuit (40) for detecting a position value or a rotational speed value of the drive mechanism. An error signal (F) is emitted, if an undesired operating condition occurs. A test signal (ε) is supplied to a safety monitoring device (30) in order to determine and emit this error signal (F), said test signal being also supplied to the control circuit (40). There, the test signal (ε) acts as an unbalance and is checked as regards its presence in the safety monitoring device.
Claims32
A process for detecting undesired operating conditions of a drive means, wherein
- (a) a sensor (50) having a control circuit coupled in a transforming manner between a stator side and a rotor side, and used for detecting a position value or a rotational speed value of the drive means;
- (b) an error signal (F) is provided, upon an occurrence of undesired operating condition;
- (c) a test signal (ε) is supplied to a safety monitoring device (30) for determining and emitting an error signal, said test signal being also supplied to the control circuit (40).
A process for detecting and/or recognizing parasitic inductions that cannot be detected and adjusted by means of control engineering on a drive, that is in particular an electric drive, comprising a sensor (50) whose output signal (u53) is used for the “control-engineering control” of the drive, wherein
- (i) a useful signal and an unbalance signal (ε,u53) are supplied both to a control circuit (40) disposed downstream of the sensor (50) and a monitoring circuit (30);
- (ii) the unbalance signal and the useful signal are subtractively combined (33) in the monitoring circuit;
- (iii) an error signal (F;F(t)) is generated (38) substantially by the combination in the monitoring circuit (30, 33) upon the leaving of a compensation.
A sensor comprising a stator and a rotor to be mounted on a drive shaft and for measuring rotary signals such as rotational speed, acceleration or position (α,ω,φ) of a drive, wherein
- (1) a control circuit (40) with a servo control (42, 49) is provided, which feeds at least two windings (51a, 51b) of the sensor (50) via an actuating portion (49) or is designed for a corresponding feeding;
- (2) a further winding (53) that is rotatable relative to the stator is disposed on the rotor of the sensor (50) to emit an operating signal (u53);
- (3) a separate monitoring circuit (30) is provided to which and to the control circuit (40) the operating signal can be fed to determine and emit an error signal (F).
A process or a sensor for the fail-safe detection of at least one signal of drive technology which is used for control engineering such as rotational speed, rotational position or acceleration, wherein
- the sensor (50) is included in a closed control loop (53, 42, 49, 51a, 51b) for compensating the signal (ω,α) of drive technology and for making it available;
- an error signal (F) can be generated or is generated due to the fact that an unbalance signal (ε) is permanently fed into the control loop, whose presence is monitored (32, 33, 38) by a separate monitoring circuit (30) to which an output signal of the sensor (50) can be fed in order to emit the error signal (F) in case of a deviation.
Dependencies are inferred from the claim text.