Design elements of DC centrifugal fans

一、Impeller

Impeller made of plastic PA66,fiberglass reinforced. All material accord with ROHS.

二、Motor

External rotor brushless DC motor ,Rotor with ferrite and coated in black. All material accord with ROHS.

三、Soft Start

The motor start at low speed,after 20 SEC running to full speed, to prevent current surges being drawn from the power supply.

四、Speed output signal

The fan provides an output signal proportional to its speed with out pull up resistor. The signal comprises of 3 cycles per revolution of a squar. The maximum amplitude of the signal is 12 V.

五、PWM input

Signal voltage range: 0～10VDC.
　　
The frequency for control signal of the fan shall be able to accept 1～10 kHZ.

六、Protection

This motor with locked-rotor protection, current limited,under-voltage and over-voltage lockout protection.

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Design elements of DC centrifugal fans