A06B-0116-B804#0037 Fanuc AC Servo Motor A06B0116B804#0037 AO6B-OII6-B8O4#OO37

Fanuc A06B-0116-B804#0037 | Beta iS Series AC Servo Motor BiS1/6000 — 0.5kW, Keyed Shaft, 90V Brake, b64iA

Part Number: A06B-0116-B804#0037

Series: Beta iS (BiS) AC Servo Motor

Model: BiS 1 / 6000

Configuration: Straight Keyed Shaft, 90V DC Electromagnetic Brake, b64iA Encoder

Condition: New / Refurbished / Exchange Available

Overview

The Fanuc A06B-0116-B804#0037 is a fully specified AC servo motor from Fanuc's Beta iS series — model BiS1/6000 — carrying three of the most consequential configuration choices available in this motor family simultaneously: a straight shaft with keyway, a 90V DC electromagnetic brake, and the b64iA encoder.

Each of these three features represents a deliberate engineering decision about where and how this motor will be used, and together they define a motor configured for fast, precise positioning applications where shaft coupling integrity, fail-safe position holding, and reliable incremental feedback are all mandatory rather than optional.

At 0.5 kW and 6,000 RPM, the BiS1/6000 is the highest-speed compact servo in the Beta iS family at this power class — built for the kind of high-cycle auxiliary drives, indexing mechanisms, and robot joint axes where fast positioning and mechanical certainty at rest are the defining requirements.

The #0037 suffix indicates this is the connector configuration variant within the B804 brake and keyway specification, accommodating the specific wiring and connector interface of the application it was designed for.

Key Specifications

Three Features, One Specific Purpose

The combination of keyed shaft, 90V brake, and b64iA encoder on this motor is not a collection of options selected for generic versatility — it reflects a coherent design intention.

The keyed shaft handles the torque transmission challenge at 6,000 RPM.

At this speed, even a 0.5 kW motor generates axis acceleration torque during rapid positioning that a plain clamping coupling must resist through friction alone.

A keyway adds a positive mechanical interlock between the shaft and hub that cannot slip regardless of shock loads, thermal cycling of the coupling clamp, or the reversal torque of high-cycle bidirectional motion.

For robot joint axes and high-speed indexing drives where the coupling is under continuous dynamic loading, this matters in the long run.

The 90V brake is the safety circuit for when the motor stops. Spring-applied, electrically released — the brake engages automatically the moment the 90V supply is removed, regardless of what the servo drive or CNC system is doing at that moment. For a vertical axis carrying load, a robotic arm holding position, or any mechanism where uncontrolled movement on power loss is a hazard, this is not an optional feature.

The 90V supply voltage distinguishes this from the more common 24V brake variants in the same family — the wiring and power supply design must account for this specifically. Applying 24V to a 90V coil produces partial engagement, which is worse than either full engagement or full release.

The b64iA encoder provides the 64,000 ppr incremental feedback that closes the velocity and position loops in the Beta iS drive system. At 6,000 RPM, the encoder generates 6.4 million pulses per second — the feedback rate that allows the drive to maintain smooth velocity control and accurate positioning at the motor's full speed range.

6,000 RPM with a Brake — Understanding the Application Context

A brake on a 6,000 RPM motor raises a practical question that is worth addressing directly: the brake does not operate at 6,000 RPM. A spring-applied electromagnetic brake is a holding device — it is engaged when the motor is at rest or decelerating to a stop, not during running operation.

The servo drive commands the axis deceleration; the brake engages mechanically after the axis has stopped, holding it in position until the drive commands the next move and the 90V supply releases the brake coil.

The 6,000 RPM ceiling and the brake therefore serve different phases of the motion cycle.

The high speed enables fast transit between positions; the brake ensures mechanical position certainty at each dwell point.

On robot joint axes, tool magazine drives, and pallet positioning mechanisms where a machine cycles hundreds or thousands of times per shift, this combination — fast move, mechanically certain stop — is exactly what the application demands.

b64iA Encoder and Drive Compatibility

The b64iA is Fanuc's incremental encoder designation for the 64,000 ppr device fitted to Beta iS series motors. It provides speed and position feedback via Fanuc's serial encoder interface protocol, which requires a compatible Beta iS amplifier.

The drive reads encoder data at the sampling rate needed to close the control loops at 6,000 RPM — faster than older analogue interface encoders support — and this is why the motor is specifically paired with Fanuc's Beta iS series servo amplifier system.

For any motor replacement, the b64iA encoder type must be matched exactly. Fitting a motor with a different encoder type — even another Fanuc motor at the same power rating — may require servo drive parameter changes, and in some cases the drive will alarm on encoder type mismatch at startup before any axis motion is attempted.

Successor and Replacement Notes

Radwell's MRO database notes that the A06B-0116-B804 series has a suggested replacement in the A06B-2116-B805, indicating this is a transition-generation motor.

For machines where the existing drive system is already configured for the BiS1/6000, sourcing a refurbished original unit avoids the reconfiguration that a newer motor might require alongside a drive upgrade. Where the machine is due for a broader servo system update, the suggested successor is worth evaluating alongside the motor.

FAQ

Q1: Why does this motor use a 90V brake rather than the more common 24V version?

The 90V brake coil is specified for this particular motor frame and the force characteristics required to hold the spring mechanism. Using a 24V supply on a 90V coil produces partial brake engagement — the spring is only partially overcome, and the motor will experience mechanical drag during operation with the shaft not fully free.

This is a damaging condition that causes overheating and accelerated brake wear. When installing this motor, the 90V DC brake supply circuit must be confirmed before powering the axis.

Q2: What is the difference between the B804 and B503 variants of the BiS1/6000?

Both carry a keyed shaft and b64iA encoder. The B503 uses a 24V DC brake; the B804 uses a 90V DC brake.

The choice between them depends on the brake supply voltage available in the machine's control cabinet. The #0037 suffix on the B804 indicates the specific connector configuration for the brake and power wiring — this must match the machine's existing cable interface to ensure a direct replacement fit.

Q3: What Beta iS servo amplifier is required for this motor?

This motor is designed for use with Fanuc's Beta iS series servo amplifier (βiSVSP or equivalent). The amplifier must support the b64iA encoder interface and be parameterised with the correct motor type code for the BiS1/6000 specification.

The 90V brake circuit requires a separate 90V DC power supply output from the machine's control cabinet — this is not provided by the servo amplifier itself and must be present and interlocked before the axis is commissioned.

Q4: Can this motor be used on a vertical robot axis or gravity-loaded mechanism?

Yes — this is one of the primary applications for the braked variant. The spring-applied 90V brake locks the shaft mechanically whenever the 90V supply is removed, including during E-stop, servo alarm, and power loss events.

This prevents axis drop or uncontrolled movement on any gravity-loaded mechanism.

The key requirement is that the 90V brake supply interlock is correctly configured — the brake must fully release before motion is commanded, and must re-engage before the drive disable signal is issued.

Q5: What inspection steps are essential for a used A06B-0116-B804#0037?

Test the brake first: apply 90V DC and confirm the shaft spins freely with no drag, then remove power and verify the shaft locks firmly without creep. A brake that releases partially or fails to hold under light load must be serviced before installation on any gravity-loaded or safety-critical axis.

Then inspect the b64iA encoder connector and cable exit for corrosion or damage.

Measure three-phase winding resistance for phase balance and check insulation resistance to earth. Rotate the shaft by hand to assess bearing condition, and inspect the keyway for fretting. A no-load bench run-up to 6,000 RPM with encoder signal verification closes the pre-installation check.