Application field of linear motor

It can as a rotary motor along the radial direction of sectioned and then leveled evolution and linear motor can be considered is the rotary motor in the structure of a deformation. With the rapid development of technology and microcomputer automatic control, of all kinds of automatic control the positioning accuracy of the system put forward higher requirements, in this case, the traditional rotating motor plus a transform mechanism is composed of a linear motion driving device, has been far from being able to meet the requirements of modern control system. Therefore, many countries in the world are in the research, development and application of linear motor, making linear motor is applied more and more widely.

Compared to the linear motor and a rotary motor, mainly in the following several characteristics: simple structure, due to the linear motor does not need to rotary motion into linear motion of the additional device, which makes the structure of the system itself is simplified, weight and volume is greatly decreased; the second is high positioning accuracy, in linear motion and linear motor can realize the direct drive, which can eliminate intermediate link brings a variety of positioning error, so the positioning accuracy is high, such as the use of microcomputer control, you can also greatly improve the positioning accuracy of the whole system; three is fast response, high sensitivity, with good liquidity. Linear motor is easy to do the rotor by magnetic levitation support, which makes the dynamic sub between stator and always maintain a certain air gap is not in contact. This eliminates the fixed and movable between the contact friction, thus greatly improves the system sensitivity, rapidity and follow-up; four is safe and reliable work, long service life. Linear motor can be achieved without contact transfer force, mechanical friction loss is almost zero, so the fault is less, maintenance free, so the work safety and reliability, long life.

Linear motor is used mainly in three aspects: one is used in automatic control system, the applications more; then, as a long-term continuous operation of the drive motor; the third is applied in needs short time, short distance to provide huge linear motion device.

High speed maglev train is the most typical example of the practical application of the linear motor, the United States, Britain, Japan, France, Germany, Canada and other countries are in the development of a linear suspension train, which is the fastest in japan.

In April 1990 installed in Tokyo are Toshima eternal building, the elevator will have a capacity of 600kg, speed of 105m/min, lifting height is 22.9m is driven by linear motor elevator in the world and is driven by the linear motor elevator. Because the elevator driven by linear motor without traction unit, so the top of the building room can be omitted. If the height of the building increased to 1000 meters, it is necessary to use wire rope for elevator, the elevator using high temperature superconducting technology driven by a linear motor, coil is arranged on the shaft, high performance permanent magnetic materials are arranged outside the car, such as the magnetic levitation train, using radio waves or light controlled technology control.

Ultra high speed motor in rotation beyond a certain limit, the rolling bearing of the motor will produce sintered and damage phenomenon of, which developed on the a linear suspension motor (AMB), the suspension technology makes the motor dynamic suspension in the air, eliminate the dynamic between the child and the stator mechanical contact and friction resistance and the speed of up to 25000 to more than 100000r/min. Thus in the high-speed motor and high speed spindle unit are widely used. Such as Japan Yaskawa recently developed multi procedure automatic numerical control lathe with 5 shaft controllable electromagnetic high speed spindle using two radial magnetic bearings and a thrust magnetic bearing, bearing the machine in any direction of load. In the middle of the shaft, in addition to the high speed motor, it is also equipped with a multi process automatic CNC lathe tool automatic exchange.