Radial Fan Motors
June 2007
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A family of compact, radial fans has free-running impellers and variable speeds that combine electronically commutated external rotor motors with newly developed integrated power electronics. Model GKHR and GKHM fans have long-life, low-temperature, brushless dc motors controlled by maintenance-free electronic circuitry. The fans are motorized impellers, mounted and balanced, which can be provided with or without an inlet cone. The fans’ external rotor design and high power density are said to make the units ideal for use in ventilation and air-conditioning applications. Reduced mechanical content means the fan motors run cooler and quieter, require little or no maintenance, and can be speed controlled using an external potentiometer or 0–10-V pulse-width modulation signal. The power supply and control leads connect directly at the motor, which is said to simplify installation. In pressure control applications, the EC motors can be direct-connected to a pressure sensor. In master-slave designs, the pressure controlled output of the master fan controls slave unit speeds. Rosenberg

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