SIEB & MEYER FM71 21.71.304 Spindle Servo Motor

Module Feature

SIEB & MEYER FM71 full part number 21.71.304 is permanent magnet synchronous high-speed spindle servo motor. It delivers ultra-high rotational speed, rapid dynamic response and stable torque output. Built-in high-resolution rotary encoder for speed and position feedback. Optimized for high-speed milling, PCB routing and semiconductor drilling applications. Matches SIEB & MEYER FC series spindle rack drives. Widely applied in CNC machining centers, PCB and semiconductor processing equipment.

Working principle

Three-phase high-frequency AC power from spindle drive creates rotating magnetic field inside stator windings. The magnetic field drives rotor rotation to produce high-speed mechanical power. Integrated encoder continuously feeds back speed and angular position signal to drive unit to realize closed-loop speed and spindle orientation control. When abnormal signal detected, drive will trigger safety interlock and cut power output.

Onboard components

Permanent magnet rotor, stator winding assembly, high resolution rotary encoder, precision contact bearings, motor housing, power connector, encoder feedback connector, shaft sealing assembly.

LED indicators

No onboard LED indicators, fault information is displayed on spindle drive unit.

Hardware self-diagnosis

Visual inspection of motor housing, shaft and connectors; winding resistance and insulation resistance measurement; encoder signal test; check bearing running noise and shaft runout.

Programming software

SIEB & MEYER commissioning software for spindle motor parameter setup, auto-tuning and fault diagnosis.

Electrical & Process Parameters

Model: FM71 21.71.304 Motor type: Permanent magnet synchronous spindle motor Control mode: Speed / Position / Orientation control Cooling: Liquid cooling Feedback: Built-in rotary encoder Mounting: Flange mounting Protection: Overheat, overload, encoder loss monitoring Mounting: Flange mounting

Mechanical & Structure

Mounting: Flange mounting Protection class: IP54

Environmental

Operating temperature: 0℃ ~ +40℃ Ambient humidity: 5~95% non-condensing Certification: CE compliant Status: SIEB & MEYER high speed spindle servo motor

System compatibility

Compatible with SIEB & MEYER FC series spindle frequency converters and rack power supply, forms complete high-speed spindle drive system.

Function

FM71 21.71.304 spindle servo motor manufactured by SIEB & MEYER. It converts electrical energy into high-speed rotary mechanical power for cutting and machining. Overload, overheating, encoder failure or winding insulation breakdown will trigger drive alarm and stop spindle operation. It is high-speed power execution unit for SIEB & MEYER CNC spindle system.

Installation

Follow lockout/tagout safety procedure before installation. Cut off all drive power completely. Mount motor via flange and couple with tool holder or spindle coupling. Connect motor power cable and encoder feedback cable to SIEB & MEYER spindle drive. Configure spindle parameters and run auto-tuning through SIEB & MEYER commissioning software, test spindle rotation before formal machining.

Interface

Motor power connector, encoder feedback connector, housing ground terminal of FM71 21.71.304.

Diagnostic

Motor no rotation: No drive power, wrong wiring or encoder fault. Overload alarm: Mechanical jam, excessive cutting load or bearing damage. Encoder fault: Damaged encoder, loose feedback cable or wrong parameter setting. Motor overheat: Continuous heavy load or insufficient liquid cooling capacity. Abnormal noise: Bearing wear, misalignment or mechanical resonance.

Product Brief

FM71 21.71.304 SIEB & MEYER permanent magnet synchronous spindle servo motor,flange mount,liquid cooling,with integrated rotary encoder,matching SIEB & MEYER FC series spindle drives,for CNC and semiconductor high speed routing & drilling spindle.