Reading Material：Linear Motors Basic[共4页]
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Electronic Technology 92 Part 4
3．Almost all three-phase power is by three-phase synchronous machines operating as generators. Synchronous generators are also called and are normally large machines
producing electrical power at hydro, nuclear, or thermal power plants.
4．The stator of a synchronous machine is that of a three-phase induction machine. The
stator winding is the source of voltage and electric power when the machine is operating as a
generator, and the input winding when it is operating as a motor.
5．The winding itself is and chorded to reduce the harmonic content of the output
voltages and currents.
6．A motor has electrical energy to its windings and a magnetic field that generates an
electromagnetic interaction to produce mechanical energy or torque.
Ⅳ．Translate the Chinese given in the brackets into English.
1．Rotating electrical machines include （多相同步电机、多相感应电机和
直流电机）.
2．In general, each machine has （固定的部分和运动的部分）.
3． （定子绕组）is supplied from an external DC source through
（滑环和电刷）.
4．With salient poles the reluctance is lowest when the field is （沿轴方向）
where the air-gap is the minimum.
5．With a cylindrical rotor the reluctance of the magnetic circuit of the field is
（而与实际方向无关）and relative to the direct axis.
Reading Material
Linear Motors Basic
The linear motor is a novel motor; it is a kind of transmission device with electrical energy directly
into linear motion mechanical energy. It can be seen that a rotary motor is cut open along the radial and
outreached to a planar form, as shown in Fig 4.1.2. One side evolved from the stator is called the
primary, and one side evolved from the rotor is called the secondary. In practical applications, primary
and secondary will be manufactured into different lengths to ensure the coupling between primary and
secondary unchanged in the scope of the required journey. Linear motor can be short-primary,
long-secondary may also be long-primary, short secondary. Taking into account the manufacturing costs,
operating costs, the current linear motor is usually short-primary long-secondary.
Take a rotary servo motor and unwrap it. So now what was the stator is now a forcer and the
rotor becomes a coil or magnet rail. With this design, the load is connected directly to the motor.
Direct linear motion is achieved without any rotary to linear transmission devices.
Linear motor technology is not new. Step motor and brushed linear motor products have been
available for quite some time. Brushless technology is becoming increasingly popular as applications
take advantage of its technology.
