Variable Speed (VS Master)
ABB Baldor-Reliance V*S Master Vector Duty Motors
Variable speed vector duty motors, 0.5 to 5 HP, TENV rolled steel, built to hold rated torque across a wide constant-torque speed range on a variable frequency drive.
The ABB Baldor-Reliance V*S Master RS line is a vector duty motor family designed from the ground up for variable frequency drive and vector control operation, not for across-the-line starting. These motors are built to deliver steady, controllable torque from low speed to full speed, which makes them the right choice when the application needs precise, adjustable speed rather than one fixed RPM. Every unit in this category uses a totally enclosed non-ventilated (TENV) rolled steel frame and Class H insulation for reliable operation across the speed range. Automation Distribution stocks and supplies this line as an authorized ABB Baldor-Reliance distributor.
Line specifications at a glance
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Power range
0.5 to 5 HP
1800 and 1200 RPM base speed
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Duty
Vector duty
Constant torque across the speed range
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Enclosure
TENV
Cools without a shaft-driven fan
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Frame
56C to 215TC
Rolled steel, C-face
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Voltage
230/460V
Three phase, inverter fed
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Insulation
Class H
Thermal margin across the speed range
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Why a vector duty motor
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Constant torque, low to full speed
Vector duty motors are wound and balanced to produce steady torque across a wide speed range under drive control, so the machine holds performance whether it runs slow or fast, rather than losing torque at low RPM.
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TENV cooling that does not depend on speed
A standard fan-cooled motor cools less as it slows down. The totally enclosed non-ventilated design has no shaft-driven fan, so cooling does not fall off at low speed, which is exactly what sustained slow-speed and near-zero-speed duty needs.
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Class H insulation
A Class H insulation system gives extra thermal headroom for the heat that inverter operation and low-speed running add, supporting reliable service across the full speed range.
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Built to pair with a drive
These motors are made to run on a variable frequency drive, such as an ABB ACS-series drive, in speed or vector control. They are not intended for across-the-line starting.
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Typical applications
- Conveyors and indexing lines needing adjustable, repeatable speed
- Positioning and indexing drives
- Winders, unwinders, and tension control
- Metering and dosing pumps and feeders
- Machine tools and process equipment needing steady torque at low speed
Selecting from this category
| Selection point | Options in this category |
| Horsepower | 0.5, 0.75, 1, 1.5, 2, 3, 5 HP |
| Base speed | 1800 RPM (4 pole) or 1200 RPM (6 pole) |
| Enclosure | TENV, totally enclosed non-ventilated |
| Frame | 56C through 215TC, rolled steel, C-face |
| Voltage | 230/460V, three phase, inverter fed |
Each product page lists the exact catalog number, base speed, full-load amps, efficiency, power factor, frame, and weight so you can match the motor to your drive and load.