摘要:
An electric motor (1) has a stator (2) and a radially symmetric, permanent magnet excited rotor (4) coaxial with the stator (2). The rotor (4) rotates relative to the stator (2) about a common motor axis (X). The stator (2) has a radially symmetric iron core (6) with a defined number (N) of stator teeth (10) which are each adjacent to one another via stator slots (8) and slot openings (8a) in the circumferential direction. The rotor (4) has pole magnets (14) adjacent to one another. A circumferential gap (18) is formed radially between the pole magnets (14) and the stator teeth (10). Each stator tooth (10) has on its surface (20) facing the gap (18) and adjacent to the slot openings (8a) on both sides in the circumferential direction a relief-like topographic region (22) radially enlarging the gap (18) with least one concave recess (24) and a smooth profile.
摘要:
An electric motor (1) has a stator (2) and a radially symmetric, permanent magnet excited rotor (4) coaxial with the stator (2). The rotor (4) rotates relative to the stator (2) about a common motor axis (X). The stator (2) has a radially symmetric iron core (6) with a defined number (N) of stator teeth (10) which are each adjacent to one another via stator slots (8) and slot openings (8a) in the circumferential direction. The rotor (4) has pole magnets (14) adjacent to one another. A circumferential gap (18) is formed radially between the pole magnets (14) and the stator teeth (10). Each stator tooth (10) has on its surface (20) facing the gap (18) and adjacent to the slot openings (8a) on both sides in the circumferential direction a relief-like topographic region (22) radially enlarging the gap (18) with least one concave recess (24) and a smooth profile.
摘要:
The invention relates to a system for the electronic commutation of a brushless DC motor (1) having three phase windings (u, v, w) which are electrically displaced by 120°, comprising a semiconductor bridge (4) consisting of six power semiconductors (S1 to S6), which drives the phase windings (u, v, w) for generating a rotating magnetic stator field, a control unit (6) which correspondingly drives the power semiconductors (S1 to S6), and a device for detecting the respective rotational position of a rotor exhibiting a permanent-magnetic magnet wheel, the device for detecting the rotor position being constructed as sensor-less evaluating unit (8), for evaluating the voltage induced by the rotating magnet wheel which can be measured at the winding terminal (U, V, W) of the motor which is not currently driven. It is the object of the present invention to achieve a reduction of running and commutation noises whilst maintaining the inexpensive and fault-insensitive sensorless rotor position detection. For this purpose, the control unit (6) drives the power semiconductors (S1 to S6) in twelve switching states, which are different with respect to the magnetic field direction effected in each case, by means of a 12-step commutation over one electrical revolution of the DC motor in dependence on the rotor positions.
摘要:
A rotating electric machine (1) having a stator (4) in a housing (2) and a rotor (10) supported by a shaft (6). The housing (2) circumferential wall (12) and first and second axially opposing end walls (14, 16) support bearing flanges with bearings (18) for the shaft (6). Two cooling fan impellers (20, 22) are connected to the shaft (6). An inner cooling fan impeller (20) positioned inside the housing (2) generates an inner cooling air circuit (A) inside the housing (2). An outer cooling fan impeller (22) provided outside the housing (2), generates an outer cooling air flow (B). The first end wall (14) is formed with a thermal conductivity of at least a specified value and has an outer cooling rib geometry (28) on its outer side facing the outer cooling fan impeller (22), and an inner cooling rib geometry (30) on its opposing inner side.
摘要:
The invention relates to a mains-commutated, synchronous AC motor (1) with permanent-magnet excitation, which is configured as an external-rotor motor with a permanent-magnet external rotor (6) which rotates around an inner stator. In this case, an electronic starting apparatus (2) is provided which actuates the stator (4) in order to start the external rotor (6) in such a manner that the external rotor (6) is accelerated in a controlled manner to its synchronous rotation speed, and then continues to run in the mains-commutated synchronous mode.
摘要:
The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit such that a sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed. The control unit is designed in such a manner that the fundamental frequency and/or the amplitude of the motor AC voltage can be varied by phase gating.
摘要:
A rotating electric machine (1) having a stator (4) in a housing (2) and a rotor (10) supported by a shaft (6). The housing (2) circumferential wall (12) and first and second axially opposing end walls (14, 16) support bearing flanges with bearings (18) for the shaft (6). Two cooling fan impellers (20, 22) are connected to the shaft (6). An inner cooling fan impeller (20) positioned inside the housing (2) generates an inner cooling air circuit (A) inside the housing (2). An outer cooling fan impeller (22) provided outside the housing (2), generates an outer cooling air flow (B). The first end wall (14) is formed with a thermal conductivity of at least a specified value and has an outer cooling rib geometry (28) on its outer side facing the outer cooling fan impeller (22), and an inner cooling rib geometry (30) on its opposing inner side.
摘要:
The invention relates to an electrical circuit arrangement for driving switching power semiconductor components at high voltage potential with a control signal predetermining a switching information for the power semiconductor component and an output voltage directly controlling the power semiconductor component. A non-controllable semiconductor valve is used as component with high dielectric strength for transferring the switching energy and the switching information.
摘要:
The invention relates to an electrical circuit arrangement for driving switching power semiconductor components at high voltage potential with a control signal predetermining a switching information for the power semiconductor component and an output voltage directly controlling the power semiconductor component. A non-controllable semiconductor valve is used as component with high dielectric strength for transferring the switching energy and the switching information.