Application of Frequency Converters in the High-Speed Motor Industry
High-speed motors are supported by air bearings or magnetic levitation bearings, featuring no friction and no intermediate mechanical structures, with significantly reduced impellers and high efficiency. However, controlling their rotational speed and operational state requires the use of high-speed frequency converters. In response to the current domestic high-speed motor industry's development being constrained by high-speed frequency converters, New Standard Electric has continuously refined its technology through years of R&D, providing advanced frequency converter drive solutions for the high-speed magnetic levitation/air suspension industry, thereby fostering the thriving growth of China's high-speed motor sector.
ZK300 Configuration of frequency converters in high-speed general industries
Carrier frequency: 6kHz~16kHz
• Maximum operating frequency: 800~1000Hz
• Power: 5.5kW~315kW
• Common applications: high-speed maglev/air suspension blower, high-speed compressor
Motor speed: 10000rpm~30000rpm
• Calculation formula: n=60 * f/P
Application characteristics of New Shida frequency converter in high-speed industry
Multiple control algorithms to choose from
There are multiple control modes available, including GVC, sensorless vector, sensorless vector, and sensorless torque, which can quickly adapt to user needs.
High carrier frequency design
Supports up to 16kHz carrier wave, effectively suppresses electromagnetic noise, and has a maximum output frequency of 1000Hz. Advanced software algorithms reconstruct motor models for more stable and safe driving of high-speed motors.
Strong adaptability to environmental temperature
The heavy-duty rated application supports ambient temperatures ranging from -10 ° C to+50 ° C, with a maximum support of 60 ° C.
Abnormal power outage protection
When the motor is running normally, cut off the power supply at the upper end of the frequency converter, and judge the motor deceleration to within the safe speed based on the relationship between the bus voltage and output frequency before cutting off the power.
Abnormal power outage protection logic
Case 1: Application in high-speed motors
Power: 110kW, 10kHz carrier frequency
Maximum output frequency: 500Hz
Maximum speed: 30000rpm
Equipment type: Maglev high-speed blower
The magnetic levitation blower is directly connected by a high-speed permanent magnet synchronous motor and an efficient ternary flow impeller, without contact, friction, or lubrication, completely eliminating transmission losses. The zk300 frequency converter adopts sensorless vector control in this application, which can accurately control the motor speed in open-loop conditions, bringing great convenience to the speed regulation of the magnetic levitation blower; The carrier frequency of 10KHz greatly reduces motor noise, which is a great advantage for the high-speed blower industry that pursues low noise.
Case 2: Application in high-speed motors
Power: 37kW~110kW
Carrier frequency: 8kHz
Maximum output frequency: 667Hz
Speed: 30000rpm
Equipment type: Air suspension high-speed blower
Air suspension bearings use aerodynamic principles to rotate around the rotor, generating outward expansion force to achieve stable suspension effect. During power outages, achieve safe shutdown based on rotational inertia.
Compared with magnetic levitation, air suspension bearings do not require power supply and have extremely high requirements for the stability of current and speed. In this application, the New Shida EP6 frequency converter has almost no fluctuation in starting current. When reaching the target speed, the output speed and current are very stable, avoiding the surge phenomenon of the air suspension blower.
Unit type: Static pressure air suspension unit
Published refrigeration range: HR has published a range of 50~300RT
Joint development of refrigeration range: 350RT~600RT
Cooling method of frequency converter: refrigerant cooling
Maximum operating frequency of the unit: 650Hz (39000 revolutions per minute)
Energy efficiency level: Double Level 1
