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【Common knowledge quiz】
First, the definition and classification of electrical motors. Electrical power pulse signal will be entered into angular displacement or displacement of the Central Line control components. Popular point of view : When receiving step drive to a pulse signal, it driven by a step in the direction of the electrical equipment of a fixed point (that is, step away from Kok). Egyptian Electrical divided into : reactive (VR); Permanent magnetism Type (PM); Mixed (HB). I companies are production slowdown permanent magnetism of ancient electrical Byj series is a permanent magnetism of electrical motors.
Second, step into the electrical frequency and the empty Affect empty sum frequency? Empty Affect refers to the frequency at empty electrical motors from lock-in normal circumstances to activate the pulse frequency. Empty sum frequency is entered in the normal functioning of the electrical pulse frequency gradually rise to the highest frequency step electrical bad step.
Third, since the positioning torque electrical motors, precision and error accumulation? Since positioning torque means that there will be no supply of stator-lock the torque rotors. Electrical motors for the precision-general from Kok 3-5%, not cumulative.
Fourth, why the torque electrical motors will rise and fall with the rotational speed? When the electrical functioning smoothly, the electrical inductance of the winding a reverse electromotive force will be formed, the higher the frequency, the greater the reverse emf. Emf role in reverse, with the electrical currents in the frequency (or rate) increases and reduced, leading to the decline in torque.
the electrical motors Byj series which features? Advantages : 1. Trapezoid back very ram extension, manufacturing processes facilitate; 2. Trapezoid very similar design suitable for a multipolar structure, not only reduced the permanent magnetism suggests the step away from the electrical Kok, and high utilization of materials; 3. Because very similar to Chi Shu rotors very few, the teeth harmonics moment for the second harmonics moment, and two stator Mistaken 90E of mutual perspective, the two stator teeth resolved moment worth equal to 13,800 Conversely, synthetic zero. Shortcomings : 4. Beneath a very large magnetic leak, reducing the effective utilization of space magnetic flux; 5. Since iron hearts of a very similar role to iron core magnetic-fluid changes will enable the inductance with the electrical frequency change, and therefore affect the dynamics of the electrical performance.
Timer First, the definition and classification timer? Timer is needed before the start of the next cycle of a base controller. I now companies are starting to produce digital engine mechanical timer. Mainly used in the washing machines wash timer, dehydration timer and fans (heaters) in the middle.
Synchronous electrical First, the rotational speed synchronous electrical Why can maintain constant? Synchronous electrical characteristics is its rotational speed and power frequency (Hz) into a percentage, as long as power frequency unchanged, maintaining constant on its rotational speed. General in each country's power supply voltage and power frequency are fixed (such as Chinese American 220V 50Hz 120V 60Hz), the very same applies to hang rotational speed electrical driven occasions.
Second, the composition and classification of electrical synchronous Synchronous motor is the permanent magnetism synchronous motor of integration institutions and the overall slowdown, there are multiple agencies slowdown change than exporting axis of rotation direction can be divided into : freedom not orientation, clockwise, counter and can control both operating. Permanent magnetism of the rotor synchronous electrical Cigang permanent magnetism is multipolar, stator are two pairs of feet are still 90 degrees electricity perspective, a very similar jacket one coil. From single-phase power supply, the shocks have driven two of the permanent Cigang rotor rotary rotary magnetic field, and reducer with calculated design to export different rotational speed and moment, with the corresponding reduction in rotational speed increase moment.
Cover most electrical 1, the full names appear extremely Electrical?
1, Chinese-called : single-phase asynchronous motor cover most.
2, English-as : Single-phase shaded-pole asynchronous motor; Therefore abroad as its : SP-motor.
Second, how much of the electrical "how very" mean? 1, covering most of the electrical is a single electrical. 2, the single-phase electrical strict sense, the main winding of the magnetic field is generated directly to the pulse magnetic field rather than straight to rotary magnetic field is not a moment; Namely : supply of electrical equipment not own. However, the external forces that can be activated by a certain direction, the direction of its rotation in the direction consistent with the external forces. 3, in order to obtain a moment, many of the electrical inter-essential, the main winding and also one of the Additional Deputy winding, a real sense of the "two of" electrical. 4, Deputy winding and the magnetic field generated by the magnetic field has a winding pairs, both interaction after forming a circular or oval rotary magnetic field, resulting in a moment about the electrical rotary. 5, covering most of the electrical enclosure is a very winding Deputy Central (called short circuit Central, president); It adopted covering a small fraction of the polar magnetic field, thereby generating another round of the synchronized with the main magnetic field is very magnetic field; After the formation of a magnetic field interaction between two oval rotary magnetic field. "covers a very" electrical therefore
Third, what synchronous rotational speed? 1, means the electrical magnetic synchronous rotational speed rotary speed. 2, the same rotational speed formula : n = 60f / P N : synchronous rotational speed (r/min). F : power frequency (Hz, 85Hz), generally 50Hz or 60Hz. P : Electrical most of the requirements (see above "5"). 3, for example : one two polar caps are electrical, rated power for 220V50Hz the same rotational speed as the N=60f/P=60 x 50/1=3000 (r/min)
which covers most major electrical characteristics?
1, low noise : 42~48dB (a). Apply to household appliances especially bedroom facilities.
2, working system for S1, continuous operation.
3, structures and processes simple, easy to manufacture and maintenance.
4, low cost.
5, convenient governor.
6, inefficient : 5~30%.
7, the low power factor : cos φ =0.43~0.72. |
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