1. High-speed electric machine

High-speed motors typically refer to those with a rotational speed exceeding 10,000 rpm. Their core advantages lie in high power density (small size with high power) and low mechanical losses. Commonly used high-speed motors include induction motors (asynchronous motors), magnetic levitation high-speed motors, and air-suspended high-speed motors. By supporting the rotor without contact, they completely eliminate mechanical friction and are suitable for ultra-high-speed scenarios (such as 30,000 - 100,000 rpm).

Induction motor

The essence of achieving high-speed operation lies in the process of resisting "slippage". The control of slip rate is the core issue of high-speed operation. It needs to be realized through the coordinated efforts of electromagnetic optimization, mechanical reinforcement and intelligent control in different aspects to achieve high-speed operation.

Magnetic levitation high-speed motor

Using electromagnetic force to suspend the rotor in the stator magnetic field, achieving dynamic balance through radial bearings (for controlling the lateral position) and axial bearings (for controlling the longitudinal position), and having the position monitored in real time by sensors and adjusting the electromagnetic force accordingly.

Air-suspended high-speed motor

By forming an air film support in the gap between the rotor and the stator through high-pressure gas (air or inert gas), it is divided into two types: hydrodynamic bearings (self-generated pressure) and hydrostatic bearings (external gas supply).

2. FGI FD300 High-performance frequency converter

FGI, in response to the application requirements of high-speed motor industries such as air suspension and magnetic suspension, has specially developed the FD300 high-performance frequency converter. This product is suitable for synchronous and asynchronous motor control, equipped with a new generation of high-speed motor-specific DSP and control algorithms, with a significant improvement in computing speed, capable of achieving high-precision and high-performance motor drive control at 1000Hz.

The FD300 high-performance frequency converter closely adheres to industry requirements, strengthens multiple usability and industry-specific modular design, and has undergone product compatibility tests with mainstream high-speed motors from multiple brands, enhancing the product's adaptability and simplifying the product's debugging process.

The product achieves a reduction in size through high power density design, and adopts independent ventilation channels and heavy-load and high power factor design schemes, which can effectively cope with harsh on-site and power grid environments. The product provides abundant interface resources and supports multi-function expansion cards, enabling it to meet more customized application requirements.

3. Product features

Superb computing power

Special DSP and control algorithms for high-speed motors, with fast computing speed, high precision and high performance motor drive control, ensuring stable and efficient operation of the motors.

High carrier frequency design

Can support a maximum carrier frequency of 16kHz, effectively reducing the current harmonic distortion rate (THDi), which can be reduced to below 5%, and has completed compatibility tests with multiple brands of mainstream high-speed motors.

Compact design

Small in size, easy to install and integrate. Independent ventilation, heavy load and high power factor solution, can cope with harsh on-site and power grid environments with high reliability.

Multiple control algorithms available for selection

Various control modes such as sensorless vector control, can quickly adapt to user needs. Reconstruct the motor model, providing more stable and safer drive for high-speed motors.

Strong temperature adaptability

Rated heavy load application supports an environmental temperature range of -10°C to +50°C.

4. Application case

A customer from Xiangtan, Hunan Province has a high-speed magnetic levitation motor.

The rated power of this motor is 100kW, the rated voltage is 380V, the rated current is 200A, the rated speed is 27,000 rpm, the number of poles is 2 pairs, the rated frequency is 900.0Hz. We have selected our FD330-132G-4-L02 high-speed driver for this motor. When operating at 900Hz with half load and a carrier frequency of 10.0kHz, the output current waveform is shown in the figure.

From the waveform of the comprehensive case test, it can be seen that:

The output current waveform of the FD300 high-performance inverter is stable, and the waveform is a standard sine wave. The current harmonics have also been detected to be less than 5%, which can effectively reduce the temperature rise of the motor and lower the failure rate of the motor.