Core Technology

Impeller

Impeller is an key component producing compressed air while rotating at high speed, which is designed with than 10years development experience of axial/centrifugal compressor in the field of aircraft to maximize the overall efficiency of the machine.

Materials

Al Alloy, SUS(option), Titanium(option)

Production Methods

Most suitable material, forged Aluminum Alloy, is used for the high-speed turbo machinery to manufacture the impeller, which is machined with a 5-axis CNC machine. Regardless of sizes, the level of execution is very accurate due to the low tolerance of 1/1000mm. It enables to design high efficiency impeller. And a hard anodizing coating on the impeller and casing improves corrosion resistance and durability.

Specific Speed and Efficiency

Specific Speed is the criterion to determine RPM for highest efficiency at the pressure and air flow required when designing impeller. Neuros applied optimal specific speed based on the experience accumulated during the development of aerospace technology resulting in maximizing the performance of the impeller.
• High RPM: Increasing in generation of heat and short life Motor and Inverter
• Low RPM: Increasing in size and the costs

PMSM

Self-developed PMSM(Permanent Magnet Synchronous Motor) for high speed operation: Patent No. 10-0572849

High efficiency & Low efficiency loss during speed turn down
Offers excellent speed control
Combined with sinus filter for low heat generation

Production Methods

Direct coupling between the Rotor of PMSM and Impeller

Minimized the power transmission loss by eliminating gearbox and lubrication system
Realized small footprint and lightweight product

Specification

Output Power: 30 ~ 330 hp
Rotational Speed: 10,000 ~ 100,000 rpm
Efficiency and Power Factor: ≥ 95 %
Number of Poles: 2
Insulation : H Class (180℃)
Cooling: Air + (Water)

Air Bearing

Air bearing is a non-contact compliant bearing, where Air film is generated automatically by the hydrodynamic interaction between viscous fluid and foil structure in a rotating sleeve or disk. They are categorized into bump type and leaf type based on the foil configuration

Principle

As the rotor speeds up, a thin film of air creates a cushion between the shaft and the bearing surface.

Configuration

• Bump type two journal bearings + two thrust bearings
• Journal Bearing : Rotor Weight, Unbalance Load, Instability → Workability
• Thrust Bearing : Thrust Load, Tip Clearance Control, Power Loss → Performance

Features

Neuros air bearing is a proven state-of-the-art technology that is already applied to the aviation engine for ACM / ECS, reliability has been verified. Non-contact air bearing achieves 100% Oil-Free operation by removing the lubricating system unlike the conventional blowers, and air bearing has high durability and convenience of maintenance because the structure is very simple. In addition, it is environmentally friendly technologies of realizing very low vibration of less than 1/5 comparing to a conventional blower without the special foundations and noise levels below 85 dB(A).

Comparison with other bearings

Bearing	Rolling Element Bearing	Air Bearing	Fluid Film Bearing
Advantage	• Small • Low Loss • High Load	• High Speed • Simple Structure • 100% Oil-Free • Low Loss	• Long Life • Low Vibration • Hydrodynamic
Disadvantages	• Noisy • Short Life • Limited DN	• Low Load • Coating • Small Rotor	• Complex • High Loss • Limited DN
Applications	• Aero Engine • Small Machine	• ACM • Small Machine	• Industrial Machine
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