The invention relates to a rotary electric machine comprising a flux-concentrating rotor with permanent magnets disposed between pole pieces, and a stator with windings on teeth.

Rotary electric machine having a flux-concentrating rotor and a stator with windings on teeth

An electric machine includes a stator and a permanent magnet flux-concentrating rotor. The permanent magnet flux-concentrating rotor has permanent magnets and pole pieces. The permanent magnets are engaged between the pole pieces. The electric machine also has at least one magnetic-field detector that is mounted on the stator. The at least one-magnetic-field detector is mounted on the stator in such a manner as to detect a magnetic field of the permanent magnets in a location that overlaps a peripheral region of the rotor when the machine if observed on the axis of rotation of the rotor.

Electric machine having at least one magnetic field detector

A method and configuration for maintaining a constant flow of air to a protective helmet (4) from a fan (3) in a battery powered fresh air unit. The fan (3) is a radial fan with a filter (5) positioned on the suction side of the fan and is operated by a brushless continuous current motor (2). With the aid of signals from position sensors (30) in the motor (2), a control unit (12) can determine the speed of the fan (3). The control unit also detects the motor's power consumption and compares this and the speed with a characteristic curve for the motor (2) for a given flow from the fan, which is stored in a memory (14). In the event of any deviation, the control unit (12) regulates a change of the voltage supply to the motor (2) so that the deviation is reduced. In this way the flow is maintained constant at the desired, adjustable level independent of the blflcking and battery voltage of the filter (5). The control unit (12) emits signals (qs), Vs to a warning indicator light and buzzer (40, 42) in an alarm unit (38) in the fresh air unit if the battery voltage falls below a predetermined minimum safety level.

Process and device for flow control of an electrical motor fan

Embodiments of the present invention relate to a system and method for noise suppression. Specifically, embodiments of the present invention include a resonator configured to suppress noise from an electric fan. The resonator may comprise an enclosure having an outer perimeter, a major opening through the enclosure and defining an inner perimeter of the enclosure, a minor opening disposed along the inner perimeter, and a chamber coupled to the minor opening within the enclosure between the inner and outer perimeters.

System and method for noise suppression

The invention relates to a stator for an electric motor. Said stator has an annular stator package having a plurality of stator teeth. An annular interconnection unit is located on the end face of said stator package. Said annular interconnection contains diverting elements. The interconnection unit has a support component which is provided with a cavity and has slots. Provided in said cavity are a multiplicity of mutually electrically insulated connector rings each having contacting elements routed externally through said slots.

Stator for an electric motor

A clean room system has filter-fan units each having at least one fan motor and being connected to an electric network. At least one central control unit is provided. A connecting bus system for connecting the filter-fan units to one another and to the at least one central control unit is provided.

Clean room system

A tan having a fan wheel and an electric motor driving it, and a control unit for controlling the motor output as a function of fan-specific parameters. An actual-value signal corresponding to an actual rotational speed of the fan is measured and compared with a control signal corresponding to a required speed, and the actual speed is adjusted to the required speed by means of the control unit, wherefore the actual speed and the actual motor current or supply current are measured and conducted to a microcontroller as input signal variables, whereby the fan-specific data such as wheel diameter, density of the conveying medium, fan coefficients, motor coefficients, and a preset artificial characteristic curve ps=ƒ({dot over (V)}s ) are stored in the microcontroller as default values. The microcontroller generates the required-speed signal, which is a function of the electrical current variables and the actual speed, based on the preset artificial characteristic curve ps=ƒ({dot over (V)}s) where ps=required operating pressure and Vs=required volume flow.

Fan with preset characteristic curve

Stator with connecting arrangement for electrical motors

The electric motor (1) has a motor housing (2) of high IP protection type, formed in part by the external rotor (6) and in part by an electronics housing (16), enclosing the control electronics (18), the external rotor fitted to a rotor shaft (12) supported by a bearing sleeve (10) within the stator (4). The bearing sleeve is formed integral with an annular flange (22) of a heat conductive material, projecting radially outwards from ther bearing sleeve at the end facing the control electronics and provided with cooling ribs (24) on the outside of the motor housing.

Electronically-commutated external rotor electric motor has motor housing of high IP protection type and annular flange with external cooling ribs integral with bearing sleeve for external rotor

The protective grille (1) with bars (2) and fixing elements (3) for fans comprises at least one damping element (6) which joins the bars similarly to a wheel spoke

Wilhelm Reinhardt

Papers

Clean room system

Fan with preset characteristic curve

Stator with connecting arrangement for electrical motors

Electronically-commutated external rotor electric motor has motor housing of high IP protection type and annular flange with external cooling ribs integral with bearing sleeve for external rotor

Protective grille with bars and fixing elements for fans comprises at least one damping element which joins the bars similarly to a wheel spoke