Description
Product Overview
The B&R 8MSA3M.R0-42 is a synchronous AC servo motor from B&R’s 8MS motor family, designed for rotary motion applications in industrial automation. It is used with a compatible servo drive to control motor speed, position, and torque in machinery such as automated assembly equipment, packaging systems, and material-handling mechanisms. The motor’s resolver feedback provides position and speed information to the drive, supporting closed-loop motion control. It is not a standalone motion controller; drive selection, motor parameterization, and machine-level control logic remain essential to correct operation.
The B&R 8MSA3M.R0-42 is identified in product references as a size 3, medium-length, self-cooled motor with resolver feedback. A maximum speed of 6,000 RPM is listed in one catalog description, but speed, torque, current, voltage, and duty limits must be confirmed against the specific nameplate and the applicable B&R documentation. The “R0-42” suffix should be retained exactly when identifying the replacement; similar 8MSA3 variants can differ in feedback, shaft, torque, or other configuration details. Do not select a substitute based solely on the shared 8MSA3 prefix.
When replacing a B&R 8MSA3M.R0-42, inspect the shaft, mounting flange, power connector, feedback connector, and any signs of impact or contamination. Verify that the installed drive recognizes the resolver and that the replacement’s motor parameters match the machine configuration. A motor that fits mechanically may still be unsuitable if its winding data, feedback characteristics, or rated operating envelope differ. Since this model is listed as discontinued, procurement should include a clear condition statement and, where possible, a documented electrical and functional test.
Product Introduction
Replacing a servo motor on an established production machine requires more than matching the mounting dimensions. The B&R 8MSA3M.R0-42 is a self-cooled synchronous servo motor with resolver feedback, intended for closed-loop motion systems using a compatible servo drive.
Before installation, verify the resolver interface, shaft and flange dimensions, motor ratings, and drive configuration. These checks help prevent commissioning faults and avoid motion-control problems caused by an electrically incompatible replacement.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 8MSA3M.R0-42 |
| Manufacturer / Brand | B&R Industrial Automation |
| Product Type | Three-phase synchronous AC servo motor |
| Product Series | 8MS |
| Frame Size | Size 3 |
| Motor Length | Medium |
| Cooling Method | Self-cooled |
| Feedback Type | Resolver, according to catalog descriptions |
| Maximum Speed | 6,000 RPM, as listed in a product catalog; verify the specific motor rating |
| Rated Speed | Requires confirmation from the applicable motor documentation |
| Rated Power | Not independently confirmed |
| Rated Torque | Requires confirmation from the nameplate or technical data |
| Rated Current | Requires confirmation from the nameplate or technical data |
| Supply / Drive Voltage | Verify the motor and compatible drive specifications |
| Shaft Configuration | Verify against the actual unit and mechanical drawing |
| Mounting | Confirm flange dimensions and mounting pattern |
| Protection Rating | Catalog listings vary; verify the motor nameplate |
| Operating Temperature | Confirm from the applicable B&R documentation |
| Condition | Manufacturer discontinuation reported; actual unit condition must be verified |
Specification note: Online descriptions for this model contain inconsistent voltage, torque, speed, and protection-rating information. The values above intentionally distinguish catalog-reported data from specifications that still require verification. Use the original motor nameplate and the relevant B&R documentation for engineering approval.
- 8MSA3M.R0-42
Related Products
The following models belong to the broader B&R motion-control ecosystem or provide related motor functions. They should not be treated as direct replacements without checking the complete electrical and mechanical specifications.
- 8MSA3M.R0-30 — Same general size and medium-length motor family, with a different suffix configuration. Verify speed, torque, and feedback compatibility.
- 8MSA3M.R0-32 — Related 8MSA3M motor variant. Confirm its ratings and shaft configuration before considering substitution.
- 8MSA3M.R0-B4 — Another medium-length 8MSA3 synchronous servo motor variant; compare the full ordering code and feedback configuration.
- 8MSA3S.R0-42 — Size 3 motor with a different length designation. Mechanical and performance equivalence must be checked.
- 8MSA3X.R0-42 — Related 8MS-series model with a different frame/length designation; verify mounting and motor characteristics.
- 8MSA4L.R0-31 — Size 4, large-length motor variant. It is a different frame configuration, not a presumed drop-in replacement.
- 8V1090.00-1 — B&R ACOPOS servo drive; a drive-family reference for motion-control applications, subject to motor compatibility.
- 8V1090.00-2 — Another ACOPOS drive variant. Confirm power, current, feedback, and configuration requirements before pairing it with a motor.
Frequently Asked Questions
What is the B&R 8MSA3M.R0-42 used for?
It is a synchronous AC servo motor used for controlled rotary motion in industrial machinery. A compatible servo drive supplies motor power and processes the feedback signals required for closed-loop control.
Does the 8MSA3M.R0-42 use resolver feedback?
Product catalog descriptions identify resolver feedback for this model. Confirm the feedback hardware and connector arrangement on the actual unit before connecting it to an existing drive.
Can I replace it with another 8MSA3 motor?
Not based on the series prefix alone. Compare the complete part number, rated torque, speed, winding characteristics, feedback type, shaft, flange, and any brake option. A similar frame does not establish electrical or mechanical interchangeability.
Can I hot-swap the servo motor while the machine is running?
No. Treat motor replacement as a controlled maintenance task. Stop the machine, isolate the drive and power sources according to site procedures, and follow the manufacturer’s discharge and mechanical safety requirements before disconnecting cables or removing the motor.
Does the 8MSA3M.R0-42 support firmware v3.1?
The motor itself is not a programmable controller. Compatibility concerns the servo drive firmware, motor identification parameters, and feedback interface. Check the installed drive model and its supported motor configuration before commissioning.
How should I test a replacement motor before installation?
Inspect the shaft and flange, connectors, housing, and cable interfaces. Have a qualified technician perform appropriate winding and insulation checks, verify resolver signals, and review any available functional-test report. Use test limits specified by the manufacturer rather than generic acceptance values.
Is the B&R 8MSA3M.R0-42 available new or refurbished, and what warranty applies?
The model is reported as discontinued, so availability may depend on remaining stock or previously installed units. Ask the supplier to state the condition clearly, identify the exact part number and serial number, describe completed tests, and provide written warranty terms.
Procurement note: Specify the full model number 8MSA3M.R0-42. Before approving a replacement, compare the original nameplate and mechanical drawing with the proposed unit, and confirm drive compatibility and feedback operation.
