Cleanroom Equipment Spare Parts

FFU Motor

A compact replacement drive motor for restoring controlled airflow in cleanroom fan filter units without replacing the complete housing and filter assembly.

Compact FFU Drive
Speed-Control Compatible
Low-Vibration Construction
Matched Mounting Options

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Product Introduction

The FFU motor is the direct-drive power component fitted between the fan impeller and the electrical control system of a fan filter unit. Typical replacements use a compact external-rotor or electronically commutated construction to fit the shallow FFU plenum while supporting variable-speed airflow control. The shaft, flange, electrical connector and control input must be selected to match the original fan assembly. Balanced rotating parts and secure bearing support help limit vibration transmitted to the ceiling grid and final filter.

Key Features

Compact motor geometry fits the restricted depth available above the FFU filter pack.

Variable-speed versions accept a matched analog, PWM or digital control interface.

Sealed bearings and a rigid mounting flange support stable direct-drive operation.

Multiple shaft, connector and flange arrangements simplify replacement in established FFU designs.

Customer Product Concerns

A replacement motor must restore airflow while remaining mechanically and electrically compatible with the existing FFU.

The replacement shaft or flange does not align with the existing impeller and mounting plate.Motor selection is matched to the original shaft diameter, projection, flange pattern and installation depth.

An incompatible speed signal prevents the FFU controller from regulating airflow.Available control interfaces are selected to suit the existing analog, PWM or communication controller.

Motor vibration is transferred into the ceiling grid and filter housing.Rigid bearing support and balanced direct-drive components reduce mechanical runout at the mounting interface.

Cable and connector differences delay field replacement.Connector pinout, cable length and lead termination can be configured for the target FFU assembly.

Typical Applications

Cleanroom fan filter unitsLaminar-flow ceiling modulesMini-environment air-supply modulesFFU retrofit and maintenance programs

Technical Parameters

Typical construction ranges for compact FFU replacement motors are shown below.

Core Material	Laminated electrical-steel stator with copper windings and permanent-magnet rotor
Panel Thickness	70-140 mm nominal motor body depth
Effective Width	120-250 mm nominal flange or housing width
Maximum Length	Up to 300 mm overall motor and shaft length
Steel Facing Thickness	1.0-3.0 mm steel or aluminum end-cover wall thickness
Core Density	7600-7850 kg/m³ for laminated electrical-steel components
Thermal Conductivity	45-55 W/(m·K) for electrical-steel motor laminations
Surface Finish	Black protective motor shell with natural silver machined or cast-metal mounting parts
Joint Type	Direct-drive shaft with bolted flange mounting and plug-in electrical lead
Customization	Available based on the intended application and operating environment.

Available Options

AC or EC motor configurationMatched shaft and flange geometryAnalog or PWM speed controlCustom cable and connector termination

Planning a FFU Motor specification?

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