A06B-0034-B577 Fanuc AC Servo Motor A06B0034B577 AO6B-OO34-B577

FANUC A06B-0034-B577 | Beta B6/2000 AC Servo Motor — Taper Shaft / i32b Encoder / 2000 rpm / IP67

B6/2000 with Taper Shaft — The B577 Configuration

The A06B-0034-B577 is FANUC's B6/2000 servo motor in the taper-shaft, i32b encoder configuration. The B6 designation identifies the torque class of this medium-frame Beta motor. At 11.2 kg it is a physically substantial motor designed for CNC axis drives that carry real sustained load rather than light positioning duties.

The taper shaft is the defining mechanical feature of this variant. The taper geometry self-centres the coupling hub as it is pulled axially onto the shaft with a draw bolt through the shaft-end thread. The hub seats to the same geometric position every time — at first installation and during every subsequent maintenance removal and reinstallation — without manual adjustment or realignment tools. This repeatability means that axis performance after a motor swap is predictable from the moment the new motor is installed.

At 2,000 rpm maximum speed with 199V/133Hz electrical specification, the B6/2000 class operates at the moderate-speed end of the Beta motor range. In FANUC's servo architecture, 199V/133Hz is the motor terminal condition generated by the servo amplifier from a standard 200V AC three-phase mains input — these are the drive's output parameters for this motor, not the mains supply voltage.

Hub installation: Use the shaft-end threaded hole and a draw bolt to pull the hub axially onto the taper. Never press or hammer onto a taper shaft. Impact loading travels directly through the shaft to the i32b encoder and rear bearing

Key Specifications

i32b Encoder — Incremental, Homing Required

The i32b is an incremental encoder providing 32 signal periods per revolution for speed and position feedback. The servo amplifier processes this count to a higher effective resolution for position control. The incremental type means position is established by counting pulses from a reference point at each power-up — a homing cycle is required before production can start. If the machine needs absolute position on power-up without homing, the Beta motor variant with an absolute encoder is the correct specification

FAQ

Q1: What is the difference between A06B-0034-B577 (taper shaft) and A06B-0034-B177 (straight shaft)?

Both are B6/2000 motors at the same electrical specification. The B577 has a taper shaft; the B177 has a straight shaft with keyway. The shaft type determines the coupling interface — a hub bored for a taper requires the B577; a hub with a keyway bore requires the B177. Confirm the existing coupling hardware before ordering.

Q2: The machine requires homing at every power-up. Is this because of the i32b encoder?

Yes. The i32b is an incremental encoder — it establishes position by counting from a reference at each power-up. A homing cycle is required every time the machine powers on before production starts. This is the expected normal behaviour for machines using Beta incremental encoder motors. For absolute position without homing, a motor variant with an absolute encoder is required.

Q3: How is the taper shaft hub installed correctly?

Use the motor's shaft-end threaded hole with a draw bolt (nut + washer) to pull the hub axially onto the taper. Never press or hammer — impact force on a taper shaft transmits directly to the encoder disc and rear bearing, causing damage that typically appears weeks later as intermittent encoder alarms under vibration rather than immediately at installation.

Q4: After replacing with A06B-0034-B577, the axis shows a following error. What should be checked?

Verify the servo amplifier's motor type parameter matches the B6/2000 specification — a parameter mismatch produces a persistent following error. Also confirm the encoder cable is fully seated at the amplifier's feedback connector and that the cable shield is correctly grounded at the amplifier end. Taper shaft misalignment after installation adds mechanical friction that increases following error and should be checked before adjusting servo gains.

Q5: What servo amplifiers are compatible with the A06B-0034-B577?

The B6/2000 pairs with FANUC Beta SVU and SVM series servo amplifiers from the Beta motor-compatible family. The specific amplifier model depends on the drive system axis count and configuration. Confirm the amplifier's rated current covers the B6/2000 motor's rated current before fitting.