How to define high speed motor？
What is a high-speed motor, there is no clear boundary definition. Generally more than 10000 r/min motor can be called high-speed motor. It is also defined by the linear speed of the rotor rotation, the linear speed of the high-speed motor is generally greater than 50 m/s, and the centrifugal stress of the rotor is proportional to the square of the linear speed, so the division according to the linear speed reflects the difficulty of the rotor structure design. The main characteristics are high rotor speed, high stator winding current and magnetic flux frequency in the core, high power density and loss density. These characteristics determine that the high-speed motor has the key technology and design method different from that of the constant speed motor, and the design and manufacturing difficulty is often multiple times greater than that of the ordinary speed motor. If it's so hard, does it work? So how about the application prospects of high-speed motors? Where can it be used? Let's look down together.
High speed motor applications
Molecular pump: Molecular pump is a common physical device that relies on high-speed rotating blades or impellers to rotate to obtain high vacuum, and can also be used to separate air and discharge gas molecules in a certain direction to achieve suction vacuum pump. The motor for this application has high cleanliness requirements, needs to be used in a clean oil-free vacuum environment, the speed can reach 32 kr/min,500 W, the required magnets can be used samarium cobalt magnets produced by Hangzhou Magnet Power Technology Co.,Ltd, such as 28H, 30H, 32H and other brands, the magnetic induction temperature coefficient is low, and has good anti-demagnetization performance within 350℃. Suitable for high temperature environment.
Separate energy storage flywheel: Its working principle is to use the inertia of the rotating body to store energy. The motor drives the flywheel to rotate at a high speed, converting electrical energy into mechanical energy and storing it; When energy needs to be released, the rotating kinetic energy of the flywheel is converted into electrical energy output by the motor. Car driven flywheel energy storage products, its concept is equivalent to hybrid car battery energy storage or supercapacitor energy storage, when the car needs to burst power, flywheel energy storage motor can be used as a generator to supply electricity to the power supply. The following energy storage motor has a power of 30kW and a speed of 50kr/min, and the rotor inside is a solid iron block.
Turbocharging: Electronic turbocharging is a new technology that has emerged in recent years. Its role is to supercharge automotive engines at low speeds to slow down eddy current hysteresis and increase torque explosion. Due to the high working environment temperature, in addition to high speed, the design of this kind of motor also needs to control the loss and temperature rise 3.of magnets The anti-eddy current component produced by us can be adopted. Under the tren of magnets The anti-eddy current component produced by us can be adopted. Under the trend of high speed and high frequency, the magnets can be divided and bonded with insulating glue, with the thickness controlled at 0.03mm and the thickness of magnets monomer 1mm. The overall resistance > 200ohms can effectively reduce the eddy current loss of magnetic steel and reduce the temperature rise.
High-speed air compressor: high-speed air compressor is the most common kind of high-power high-speed motor, the speed is about tens of thousands of RPM, the power is between 20-1000kW, generally using magnetic bearings, through the motor to drive the turbine or blade to pressure the air. The high-speed direct drive motor replaces the original low-speed motor + speeder system, which has the advantages of compact structure and high reliability. This type of motor is commonly used in the surface mount permanent magnet synchronous motor and induction motor two types.
High speed motor protection measures
The rotor centrifugal force is very large when the motor rotates at high speed. In order to ensure the stable operation of the rotor, the protective sleeve design is the key to the design of the high-speed motor. Since most high-speed permanent magnet motors use NdFeB permanent magnets or SmCo magnets, the compressive strength of the material is large, and the tensile strength is small, so for the permanent magnet of the internal rotor motor structure, protection measures must be taken. One is to bind the permanent magnet with carbon fiber, and the other is to add a high-strength non-magnetic alloy protective sleeve on the outside of the permanent magnet. However, the electrical conductivity of the alloy sheath is large, space and time harmonics will produce a large eddy current loss in the alloy sheath, the electrical conductivity of the carbon fiber sheath is much smaller than the alloy sheath, which can effectively inhibit the eddy current loss in the sheath, but the hot wire of the carbon fiber sheath is very poor, the rotor heat is difficult to disperse, and the processing technology of the carbon fiber sheath is complex, so the processing accuracy is high.
Hangzhou Magnet Power Technology Co.,Ltd can not only provide customers with rare earth permanent magnets for high-speed motors, but also have the designing manufacturing and assembling capabilities of the entire rotor. Applied to magnetic suspension high speed motor and air suspension high speed motor. Motor rotor jacket materials available for production include GH4169, titanium alloy, carbon fiber.
Post time: Aug-05-2024
