Abstract: A squirrel-cage rotor of an asynchronous machine includes a laminated core having grooves and positioned in fixed rotative engagement on a shaft, and a squirrel cage including short-circuit rods which are received in the grooves and have opposite front faces, and short-circuit rings which connect the short-circuit rods on the front faces. Shrink rings respectively surround the short-circuit rings at least radially outside and rest on the shaft. A pressure-resistant hardenable plastic is provided in a gap between the short-circuit rings and the shrink rings.

Abstract: A squirrel-cage rotor of an asynchronous machine includes a laminated core having grooves and positioned in fixed rotative engagement on a shaft, and a squirrel cage including short-circuit rods which are received in the grooves and have opposite front faces, and short-circuit rings which connect the short-circuit rods on the front faces. Shrink rings respectively surround the short-circuit rings at least radially outside and rest on the shaft. A pressure-resistant hardenable plastic is provided in a gap between the short-circuit rings and the shrink rings.

Abstract: The invention relates to a shaft sealing device (11) for sealing gas-fluid mixtures or cooling lubricants in electrical machines of work machines, particularly machine tools, having the following characteristics: —the shaft sealing device (11) is axially positioned between the work machine and the bearing of the electrical machine, —a spin element (6) is connected in a torsion-proof fashion to a shaft (10) of the electrical machine and is designed with at least one rear section (13) facing the bearing, —at least one fixed cover (3) connected to a bearing shield (1) in a fixed manner, the structure of said cover forming a labyrinth seal with the rear section (13) of the spin element (6), —said labyrinth seal comprising at least spray-off edges, two collecting grooves (5, 2), and beveled jacket surfaces, wherein, at least from the last collecting groove (2), via a return channel (4); the delivery of the collected medium to the outside is ensured by the Venturi effect while the electrical machine is in operation

Abstract: The invention relates to a rotary encoder (1) with a sensor (2) for detecting a measured variable that is dependent on the rotational position of a rotatable object, the rotary encoder (1) having at least one rotary encoder output (8) for emitting a rotational signal (DS) that corresponds to the measured variable. The rotary encoder (1) has a terminal (9) for connecting at least one other sensor (10). The rotary encoder (1) has at least one sensor signal output (11) for emitting an additional signal (WS), which corresponds to a measured variable detected by the other sensor(s) (10).

Abstract: According to the method a temperature module is defined, simulating the thermal behavior in the electric motor (1), based on a multi-mass model. The rotational speed (n) and the current (i) for the electric motor (1) are continuously recorded as input parameters for the temperature model and at least one bearing power loss and/or bearing inner temperature (TIL1?), corresponding to a bearing (8,9), is continuously derived from the temperature model. A first warning signal (W1) is given when a computer-determined bearing power loss exceeds a given comparative value. Furthermore, a second warning signal (W2) is given when a computer-determined bearing inner ring temperature exceeds a given temperature difference (?T) from a corresponding computed bearing outer ring temperature (TAL1?). The thermal behavior of non-accessible components, in particular, the bearing (8, 9), can thus advantageously be determined by mere evaluation of the current (i) and the rotational speed (n).

Abstract: Temperature or vibration sensors (14) are often used, in addition to a transmitter (13), to monitor a motor (12). The aim of the invention is to simplify the transmission of the sensor signals of a plurality of sensor devices (13,14) mounted in or on a motor (12). To this end, an interface module (15) is mounted in or on a motor (12), especially in or on an electric motor, said interface module comprising a processing device for receiving and processing a first sensor signal emitted by a first sensor component (13). The first sensor component (13) is embodied in such a way as to detect a first physical variable and to emit the first sensor signal, and the processing device is embodied in such a way as to additionally receive and process a second sensor signal emitted by a second sensor component (14). The second sensor component (14) is used to detect a second physical variable and to emit the second sensor signal.

Abstract: According to the method a temperature module is defined, simulating the thermal behavior in the electric motor (1), based on a multi-mass model. The rotational speed (n) and the current (i) for the electric motor (1) are continuously recorded as input parameters for the temperature model and at least one bearing power loss and/or bearing inner temperature (TIL1?), corresponding to a bearing (8,9), is continuously derived from the temperature model. A first warning signal (W1) is given when a computer-determined bearing power loss exceeds a given comparative value. Furthermore, a second warning signal (W2) is given when a computer-determined bearing inner ring temperature exceeds a given temperature difference (?T) from a corresponding computed bearing outer ring temperature (TAL1?). The thermal behavior of non-accessible components, in particular, the bearing (8, 9), can thus advantageously be determined by mere evaluation of the current (i) and the rotational speed (n).