Turbo blowers with wear-free drive motor
The benefits of using magnetic bearings are clear to see:
- Oil-free
- Wear-free
- Maintenance-free
The shaft rotates permanently around its centre of gravity, making it vibration-free. As it remains free from any physical contact, no lubrication is required.
Even frequent start-stop processes are completely wear-free. During shutdown, the shaft is brought to a standstill within the magnetic field. In the unlikely event of a failure of the magnetic bearing controller, the safety bearings will bring the shaft gently to a halt.
The drive motor is airtight, so it cannot be contaminated by the ambient air – substantially increasing the turbo blower’s operational reliability, availability and service life.
Turbo blower technology
Turbo blowers work on the principle of dynamic compression. The impeller of the radially-acting turbo compressor accelerates intake air in the circumferential direction, thereby increasing flow speed and, as a consequence, energy. Part of this
energy is converted into an increase in static pressure in the downstream diffuser. With few moving components in this turbo
machine, an increase in pressure with continuous flow is generated.
The high-speed motor
A high efficiency permanent magnet synchronous motor
(PMSM) is responsible for the direct and loss-free generation of impeller speeds up to 30,000 rpm. The motor’s
impressive performance is made possible due to its
canned motor design, whereby the stator and magnetic
bearing are encapsulated from environmental influences – and without a wearing shaft seal. In order to ensure
effective and controlled cooling, the motor is exclusively
water-cooled, which also protects it from ingress of fine
dust.
The motor shaft is levitated by a magnetic bearing that
not only enables the high motor speeds to be achieved
with zero contact or wear, but also permits virtually unlimited
motor starting frequency.
Furthermore, the active magnetic bearing immediately detects and compensates for deflections to keep the motor
shaft safely in its rotational orbit. The magnetic bearing
control device is protected against power supply failure
by regenerative motor operation. In the event of unexpected, drastic pressure surges, safety bearings
provide further protection for the motor shaft so
that it can be brought to a controlled stop without
damage.
