High-speed motors have the advantages of high efficiency, large specific power, high power factor, high reliability and easy maintenance. In advanced industrial countries, high-speed motors have been widely used in aviation, aerospace and mold industries. my country's high-speed motor industry began in the 1990s. Products have continued to develop from low-end to high-end, and the market size has also continued to expand.
The applications of high-speed motors are expanding in an explosive manner. In order of high speed, there are the following applications.
Electrical Tools
The electric rotor, 200 W, 300 kr/min, adopts coreless PCB winding technology and integrates the control chip. It is very compact. This kind of electric rotor can also be used in dental and other medical equipment.
Molecular Pump
Molecular pump is a common physical device for obtaining high vacuum. It can also be used to separate air and obtain high clean air. The motor speed for this application can reach 32 kr/min, 500 W. It can be designed using an induction motor or a concentrated winding permanent magnet motor.
Separate energy storage flywheel
There are many subdivisions of energy storage, including flywheel energy storage used in aircraft and flywheel energy storage used in power stations. The following example is a flywheel energy storage product for vehicle driving. Its concept is equivalent to the battery energy storage of hybrid vehicles. Or supercapacitor energy storage. When the car needs a burst of power, the flywheel energy storage motor can serve as a generator to supply electricity to the power supply. The energy storage motor below has a power of 30 kW and a rotation speed of 50 kr/min. It adopts an induction motor scheme and the rotor is a solid iron block.
Turbocharging
Electronic turbocharging is a new technology that has emerged in recent years. Its function is to supercharge the automobile engine at low speeds to slow down the vortex lag and increase the explosive torque. The picture below is a 10 kW, 100 kr/min product developed by BorgWarner. It uses a 2-pole 24-slot permanent magnet motor structure. Because the working environment temperature is high, in addition to high speed, the design of this type of motor also Magnetic steel loss and temperature rise need to be controlled.
Micro gas turbine
The micro gas turbine is definitely a legendary product. A machine about the length of a pencil can burst out 50 kW of power. It is said that its application in automobiles can reduce the size of the engine by 95%. In addition to automobiles, many devices require such small engines. .
High speed air compressor
High-speed air compressor is currently the most common type of high-power high-speed motor, with a rotation speed of tens of thousands of rpm and a power between 100-700 kW. It generally uses magnetic bearings and drives turbines or blades through the motor to pressurize the air. The high-speed direct drive motor replaces the original low-speed motor + speed increaser system, which has the advantages of compact structure and high reliability. Two types of motors commonly used are surface-mounted permanent magnet synchronous motors and induction motors.
Vehicle drive motor
Vehicle drive motors are still the hottest field at present. The mainstream speed of passenger cars is within 16,000 r/min, and higher speed motors are already being developed. The picture below shows a 25,000 r/min, 225 kW induction motor developed by a company. It has an outer diameter of 290 mm, a stack height of 230 mm, and a maximum torque of 358 N·m. It adopts a water-cooled structure.
Aircraft drive motor
As the pace of aircraft electrification and semi-electricity accelerates, the demand for high-power and high-speed motors is also rising. The picture below is a 300 kW, 35 kr/min permanent magnet motor using a concentrated winding permanent magnet motor solution. The motor weighs 28.4 kg.
