A06B-0145-B077 Fanuc AC Servo Motor A06B0145B077 AO6B-OI45-BO77

Fanuc A06B-0145-B077 | ALPHA Series AC22/1500 Servo Motor

Part Number: A06B-0145-B077

Series: ALPHA AC Servo Motor

Model: AC22 / 1500

Condition: New / Refurbished / Exchange Available

Overview

The Fanuc A06B-0145-B077 belongs to the ALPHA series AC servo motor family — specifically the AC22/1500 model, one of the heavier-torque units in a generation that became deeply embedded in the small-to-medium CNC machine tool market.

Where the AC12 motors covered lighter axis loads, the AC22 steps up to a 22 Nm continuous torque rating and 3.8 kW output, which puts it in the territory of larger ballscrew axes, heavier table drives, and applications where the mechanical load demands more sustained force than a compact servo can provide.

The red end cap is the visual signature of this ALPHA generation, and the AC22/1500 was a common sight on the X, Y, and Z axes of mid-range vertical machining centers, horizontal boring mills, and turning centers where Fanuc drive systems were the builder's standard. At 1,500 RPM maximum, this is a low-speed, high-torque motor — it is designed to work hard at moderate speeds rather than spin fast with light loads.

Factory-fitted IP67 sealing, a straight output shaft, and no integrated brake define this particular variant. It is a straightforward, robust unit built for environments where coolant exposure is routine and axis drive requirements are constant.

Key Specifications

Where the AC22 Sits in the ALPHA Range

The step from the AC12 to the AC22 frame is meaningful — torque nearly doubles, current draw increases substantially, and the motor physically grows to match.

On a machine with a heavy saddle or large worktable, the AC22/1500 delivers the sustained torque needed to maintain accurate feedrates under full cutting load without the servo drive hunting or the axis losing position integrity mid-pass.

The 1,500 RPM ceiling shapes how this motor is applied. With typical ballscrew lead values on machine tool axes, 1,500 RPM translates to a rapid traverse rate that suits the machines it was designed for — not a high-speed contouring motor, but a solid, torque-dense workhorse for axes where stiffness under load matters more than maximum speed.

The 100 Hz electrical frequency at rated speed reflects this design priority.

Running at 19 A rated current, the AC22/1500 requires appropriately sized servo amplifier current capacity.

This is one of the more current-hungry motors in the ALPHA family at this size class, and it is worth confirming the drive module rating during any replacement or retrofit work.

IP67 Sealing — Factory Standard

The IP67 rating on this variant is not an aftermarket modification — it is built into the motor at the factory. Shaft seals, cable entry points, and the motor housing are all rated to withstand temporary immersion, which in a machine tool context means the motor handles coolant spray, mist saturation, and the inevitable fluid accumulation that occurs around axis drive areas on busy production machines.

For shops running high-pressure coolant systems or through-spindle coolant setups where fluid migration around axis drives is an ongoing concern, the IP67 rating translates directly to longer mean time between failures compared to motors with lower ingress protection ratings.

Bearing contamination and winding degradation from coolant ingress are among the leading causes of premature servo motor failure — the sealed housing addresses both.

Shaft, Brake & Installation Notes

The straight shaft with no brake keeps the mechanical and electrical installation clean. Without a brake circuit to wire and interlock, commissioning is simpler, and there are no additional 24 VDC brake supply requirements to manage.

For horizontal axes or applications where the servo drive holds position through active torque retention, this is entirely appropriate. On vertical axes with significant gravity load, a brake variant should be considered instead — this motor is not that variant.

Coupling to ballscrews, timing belt drives, or servo couplings follows standard practice for the ALPHA AC22 frame size.

The straight shaft dimensions are consistent across the ALPHA series for this frame class, which simplifies sourcing of couplings and drive components when servicing existing machines.

Drive & Control Compatibility

The A06B-0145-B077 is compatible with Fanuc ALPHA series servo amplifiers and pairs with the range of Fanuc CNC platforms that were current during this motor generation — including Series 0, 0i, 16, 18, 21, and related controls.

Servo amplifier sizing must account for the 19 A rated current; an undersized drive module will trigger continuous overcurrent faults under normal axis load conditions.

As with all ALPHA series motors, the servo drive parameters must be set to match the specific motor type.

The motor type code, maximum speed, and encoder specification all need to match the installed motor — particularly important when swapping between AC12 and AC22 frame sizes where a previous repair may have used a non-original replacement.

Sourcing & Condition Assessment

The AC22/1500 ALPHA motor remains available in the refurbished and surplus servo market. When inspecting a used A06B-0145-B077, check the IP67 shaft seal for hardening, cracking, or signs of coolant bypass — a degraded shaft seal is often the first indicator that a motor has been running in a wet environment beyond its seal service life.

Measure three-phase winding resistance for balance and check insulation resistance to earth. Rotate the shaft by hand to assess bearing condition.

Any motor with evidence of winding discoloration, burnt smell, or coolant contamination inside the housing should be evaluated by a qualified servo repair shop before reinstallation.

FAQ

Q1: What servo amplifier is compatible with the Fanuc A06B-0145-B077?

This motor requires a Fanuc ALPHA series servo amplifier (SVM or SVU module) rated to handle at least 19 A continuous output current.

It integrates with Fanuc CNC controls including Series 0, 0i, 16, 18, and 21 platforms. The servo drive must be parameterized with the correct motor type code for the AC22/1500 — do not assume a drive configured for an AC12 motor will run this unit correctly without a parameter update.

Q2: Why does the AC22/1500 run at a lower maximum speed than the AC12 series motors?

The AC22 is designed around high torque at moderate speeds. At 22 Nm and 3.8 kW, it prioritizes force output over rotational velocity — which is exactly what larger, heavier axis drives require.

The 1,500 RPM ceiling is a deliberate design trade-off: by optimizing the motor's electromagnetic geometry for torque density rather than high-speed operation, it delivers the axis stiffness and sustained cutting force that medium-sized machine tools demand.

Q3: This motor has no brake — is it suitable for a vertical axis?

Not without additional considerations. The A06B-0145-B077 has no integrated brake, so the servo drive must provide active holding torque to prevent axis movement when stationary.

For vertical axes carrying significant workpiece or table weight, a brake variant is the safer engineering choice. Relying on the drive alone for holding on a heavily loaded vertical axis introduces risk during E-stop, servo alarm, or power loss events.

Q4: What does IP67 mean in practical terms for a machine tool environment?

IP67 means the motor is fully dust-tight and can withstand immersion in water up to one meter for 30 minutes. In a machining environment, this primarily means the motor tolerates continuous coolant splash, mist, and fluid accumulation without ingress into the housing.

It does not mean the motor is suitable for high-pressure jet wash or permanent submersion — but for normal machine tool coolant exposure, IP67 provides a meaningful service life advantage over IP54 or IP65 rated motors.

Q5: Can the A06B-0145-B077 directly replace an AC12 series motor on the same machine axis?

No — not as a direct drop-in. The AC22 frame is physically larger, the shaft dimensions differ, the rated current is higher, and the servo drive parameters must be reconfigured.

Swapping between AC12 and AC22 motors on an existing axis requires mechanical assessment of the motor mount and coupling, confirmation that the installed amplifier can supply the higher current, and a full parameter review in the CNC.

Treating them as interchangeable without this verification is a reliable way to create a drive fault or mechanical alignment problem.