外文翻譯---電動(dòng)機(jī)的結(jié)構(gòu)特點(diǎn)-其他專業(yè)-展示頁
2025-01-31 09:40本頁面
【正文】 torque. If, on the other hand, the brushes were placed on the same line as the field axis, then half of the conductors would produce clockwise torque and the other half of the counterclockwise torque, yield a zero torque. 摘自《電氣自動(dòng)化專業(yè)英語》哈工大出版社 李久勝、馬洪飛 等編 2021 年 6 月第二版 譯文： 英文翻譯 第 6 頁 共 8 頁 電動(dòng)機(jī)的結(jié)構(gòu)特點(diǎn) 機(jī)電設(shè)備的能量轉(zhuǎn)換過程通常包括兩個(gè)重要的結(jié)構(gòu)特點(diǎn)，他們是產(chǎn)生磁通密度的勵(lì)磁繞組和工作被感應(yīng)的電樞繞組。 is made to span only 180 mechanical degrees and then is repeated over the remaining 180 mechanical degrees, a machine having a fourpole field distribution results. For a ppole machine the basic winding pattern must be repeated p/2 times within the circumference of the inner surface of the stator. The revolving field produced by stator winding cuts the rotor conductors, thereby inducing voltages. Since the rotor winding is shortcircuited by the end rings, the induced voltages cause currents to flow which in turn react with the field to produce electromagic torque—and so motor action results. Accordingly, on the basis of the foregoing description, it should be clear that for the threephase induction motor the field winding is located on the stator and the armature winding on the rotor. Another point worth noting is that this machine is singly excited, ., electrical power is applied only to the stator winding. Current flows through the rotor winding by induction. As a consequence both the ma gizing current, which sets up the magic field, and the power current which allows energy to be delivered to the shaft load, flow through the stator winding. For this reason, and in the interest of keeping the magizing current as small as possible in order that the power ponent may be correspondingly large for a given current rating, the air gap of induction motors is made as small as mechanical clearance will allow. The airgap lengths vary form about for smaller machines to . for machines of higher rating and speed. 英文翻譯 第 3 頁 共 8 頁 Machines The essential construction features of the synchronous machine are depicted in . The stator consists of a stator frame, a slotted stator core, which provides a lowreluctance path for the magic flux, and a threephase winding imbedded in the slots. Note that the basic twopole pattern of (a) is repeated twice, indicating that the threephase winding is designed for four poles. The rotor either is cylindrical and equipped with a distributed winding or else has salient poles with a coil wound on each leg as depicted in cylindrical construction is used exclusively for turbogenerators, which operate at high speed
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