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SR-A3.0068.030-04.000 Bosch Rexroth Indramat

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The Bosch Rexroth Indramat SR-A3.0068.030-04.000 is part of the SR Synchronous Servo Motors series and weighs 9.6 kilograms with the brake. It has a brake rated current of 0.66 A, a 24 VDC brake supply voltage, and provides a holding brake torque of 10.0 Nm. The motor features an IP67 protection type except at the output flange, a 116 mm flange size, a resolver encoder, and a rated speed of 3000 per minute.

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Product Description:

The SR-A3.0068.030-04.000 is a brushless synchronous servo motor manufactured by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. It is intended for closed-loop industrial axes, where it converts drive current into controlled rotary motion for positioning stages, pick-and-place heads, and packaging spindles. A resolver mounted on the stator supplies real-time rotor position feedback so the connected controller can correct phase currents and maintain commanded positions as the mechanical load changes. The motor also includes a spring-applied holding brake that secures the axis when power is removed.

At the nominal operating point, the motor turns at 3000 rpm, which suits many servo applications that require fast and stable shaft speed. A torque constant of 1.36 Nm/A provides a direct relationship between motor current and developed torque, which helps describe response during acceleration and load changes. System responsiveness is influenced by the rotor and embedded encoder inertia of 11 × 10⁻⁴ kg·m², a moderate value that supports quick reversals and controlled settling. If motion is blocked, the stator can produce a locked-rotor torque of 6.8 Nm while drawing a locked-rotor current of 5.0 A. These values describe the motor’s behavior during stall conditions and short-duration overload events.

During static holding or emergency stops, the spring-applied brake provides 10.0 Nm of holding torque and releases when energized from a 24 VDC supply. The brake circuit allows a voltage tolerance of ±10 percent with 5 percent ripple, and the brake release current is 0.66 A. Total mass is 9.6 kg, which supports solid mounting without making the assembly excessively heavy for compact servo axes. The cast aluminum housing has an IP67 enclosure rating except at the output flange, allowing washdown use when the shaft seal is protected. The motor mounts with a 116 mm square flange, uses an Ø19 × 40 mm shaft with an A6 × 6 × 32 feather key, and measures 294 mm overall with the brake installed. Resolver accuracy is stated as ±10 angular minutes at 8192 increments per revolution, supporting stable position feedback for precise axis control.

Brake Rated Current
0.66 A
Brake Supply Voltage
24 VDC ±10%, 5% ripple
Encoder Type
Resolver
Feather Key
A6 x 6 x 32
Flange Size
116 mm
Holding Brake Torque
10.0 Nm
Inertia (incl. Encoder)
11 ×10⁻⁴ kg·m²
Locked-rotor Current
5.0 A
Locked-rotor Torque
6.8 Nm
Mass (with Brake)
9.6 kg
Motor Length (with Brake)
294 mm
Output Shaft
Ø19 x 40 mm
Protection Type
IP67 (Except Output Flange)
Rated Speed
3000 min⁻¹
Resolver Precision
±10 angular min / 8192 incr/rev
Torque Constant
1.36 Nm/A

Frequently Asked Questions about SR-A3.0068.030-04.000:

Q: What is the holding brake torque offered by the SR-A3.0068.030-04.000 servo motor?

A: The holding brake on this motor provides a torque of 10.0 Nm for secure load holding.

Q: What type and precision of encoder does the SR-A3.0068.030-04.000 have?

A: The SR-A3.0068.030-04.000 uses a resolver with ±10 angular minutes precision and 8192 increments per revolution.

Q: What is the flange size of the SR-A3.0068.030-04.000 servo motor?

A: The flange size of this servo motor is 116 mm.

Q: What protection type does the SR-A3.0068.030-04.000 offer?

A: This servo motor features an IP67 protection rating, except at the output flange.

Q: What is the rated speed of the SR-A3.0068.030-04.000 servo motor?

A: The rated speed for the SR-A3.0068.030-04.000 is 3000 min⁻¹.


Internal Product Review

  • ‘‘The SR-A3.0068.030-04.000 is a Bosch Rexroth Indramat synchronous servo motor with IP67 protection and resolver feedback. Rated speed of 3000 min⁻¹ and holding brake torque of 10.0 Nm support accurate, dependable axis control in servo applications. A strong choice for motion systems requiring sealed construction and stable feedback performance.’’

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