New Fanuc AC Servo Motor A06B-0372-B588 AO6B-O372-B588 A06B0372B588

FANUC A06B-0372-B588 | Alpha A2/2000 AC Servo Motor — 0.4 kW / 2 Nm / 2000 rpm / Straight Shaft / A1000 Encoder

A2/2000 — Where This Motor Fits

The A06B-0372-B588 is FANUC's Alpha A2/2000 servo motor in the straight-shaft, A1000 encoder configuration. At 0.4 kW and 2 Nm stall torque, it handles compact CNC axes that need real machine-duty performance in a small frame: feed axes on small turning centres and machining centres, rotary table drives, positioning assemblies, and auxiliary servo positions where getting the replacement exactly right matters more than finding anything that physically fits.

The A2 class designation means 2 Nm continuous stall torque — the torque the motor delivers without exceeding its thermal rating under sustained load. The 16 Nm maximum torque provides the headroom for acceleration transients during rapid positioning cycles

Key Specifications

Encoder and Shaft — What to Confirm Before Ordering

The A1000 encoder is an incremental type providing 1,000 signal periods per revolution. FANUC's servo amplifier electronics multiply this count to a higher effective resolution. The key implication: the A1000 encoder requires a reference-return (homing) cycle at every machine power-up to re-establish the axis position reference. If the installed machine depends on absolute position without homing, the motor variant with an absolute encoder is required.

The straight shaft is the other confirmation point. Shaft style determines the coupling: a motor with a straight shaft mates with a friction-clamp coupling hub; a tapered-shaft motor requires a different hub design entirely. In a replacement job, mixing shaft types means the motor physically does not fit the existing mechanical interface. Confirm the installed motor's shaft type from its nameplate before ordering.

Within the A06B-0372 family, adjacent suffix variants differ in encoder type, shaft style, or brake configuration. The B588 specifies straight shaft and A1000 encoder with no brake. Confirm the installed motor's complete suffix before sourcing a replacement.

FAQ

Q1: What amplifiers are compatible with the A06B-0372-B588?

The A06B-0372 Alpha A2/2000 series pairs with FANUC Alpha SVM servo amplifier modules from the A06B-6079 and A06B-6096 families. The specific SVM variant depends on the drive system's axis configuration. Confirm the amplifier's rated current covers the motor's 2.2A stall current requirement.

Q2: The axis shows following error after the motor was replaced with A06B-0372-B588. What should be checked?

Following error after a motor swap typically indicates the servo amplifier's motor type parameter does not match the installed motor, or the encoder cable is not fully seated at the amplifier's feedback connector. Verify the motor type parameter in the CNC matches the A2/2000 Alpha class, and confirm no bent or contaminated pins on the encoder connector.

Q3: Is the A1000 encoder absolute or incremental?

Incremental. The A1000 requires a reference-return cycle at each power-up to establish the axis position reference. If the machine needs absolute position on power-up without a homing cycle, the motor variant with a FANUC absolute pulsecoder is required. Confirm the installed machine's homing behaviour before ordering.

Q4: Does the A06B-0372-B588 include a brake?

No. The B588 suffix specifies no brake. The servo amplifier's closed position loop holds the axis at rest during normal operation. For vertical axes or gravity-loaded mechanisms that need mechanical holding when the servo is off, specify the brake variant with the corresponding B suffix.

Q5: Where is the A06B-0372-B588 sourced?

FANUC Alpha A2/2000 motors are available through the CNC aftermarket — new surplus, tested refurbished, and motor rebuild services. Confirm the B588 suffix (straight shaft, A1000, no brake) from the installed motor's nameplate before ordering. Rebuilt motors should include encoder alignment verification as part of the rebuild process.