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High-performance inverter-duty motors are designed to handle lower speeds without overheating, and can withstand the PWM output of an inverter (VFD). Inverter-duty motors are used in variable speed applications such as machine tools, conveyors, crane and hoist systems, extruders and packaging/converting equipment. These motors may also have encoder capability for use with a vector VFD.
High-performance Inverter Duty AC Motors
Category Selection
Matching the AC motor to the application
AC Motors Selector
AutomationDirect offers a wide variety of inverter-duty and vector-duty induction motors from Marathon Electric and Leeson.
General Purpose vs. Inverter-Duty Motors
- Sizes from fractional horsepower up to 100hp, depending on series
- Marathon motors offered are performance-matched with our DURAPulse and GSX series AC drives
- Leeson washdown-rated motors in TENV enclosures
For part listings and specifications, go to Shop Now
Marathon microMAX™
- Sizes from 1/4 to 10hp
- TENV and TEFC enclosure
- Dual mounting options, C-face rigid base and C-face round body
- Cooler running and lighter weight design, allowing an easy transition from PMDC
Starting at
$265.00
(Y500)
Marathon MAX+ with Encoder
- Sizes from 1/2 to 5hp
- TENV enclosure
- Integrated Dynapar HS20 1024 ppr encoder
- Optimized for operation with IGBT inverter
- 230/460 VAC, replaces 90 volt and 180 volt PMDC motors (when used with AC variable frequency drives)
Starting at
$1,038.00
(Y280)
Marathon Black Max®
- Sizes from 1/4 to 30hp
- TENV enclosure
- Provisions for encoder mounting
- Used in any high performance application with closed or open loop vector controls or Volts/Hertz drives
- Low inertia design for extremely quick response
- For applications where full torque at zero speed is required
Starting at
$394.00
(Y592)
Marathon Black Max® with Encoder
- Sizes from 1/4 to 30hp
- TENV enclosure with Dynapar model HS35 shaft-mounted encoder installed
- The encoder requires a 5-26 VDC power source, provides a count of 1,024 pulses per revolution (PPR) output and includes a 10 pin connector
Starting at
$1,639.00
(Y592-A772)
Marathon Blue Max® 2000
- Sizes from 40hp to 100hp
- TEBC and TEFC enclosures
- Provisions for encoder mounting
- Used in variable frequency drive applications requiring full rated torque at zero speed
- For closed or open loop (sensorless) vector control
- Cast iron "severe duty" construction
Starting at
$5,698.00
(Y571)
Marathon Blue Max® 2000 with Encoder
- TEBC and TEFC enclosures
- Dynapar Model HS35 shaft mounted encoder installed
- The encoder requires a 5-26 VDC power source, provides a count of 1,024 pulses per revolution (PPR) output and includes a 10 pin connector
Starting at
$7,002.00
(Y571-A774)
Leeson Washguard SST
New!
Stainless steel Washguard SST motors from Leeson are built tough, intended to withstand the most demanding washdown environments.
- Sizes up to 3/4hp
- 208-230/460 VAC 3-phase
- All exterior components of 300 Series stainless steel, including motor frame, endshield and conduit box castings
- Interior corrosion protection
- Shaft seals on both ends of TEFC motors
- Sealed bearings with internally locked shaft end bearing
- Mounting options include C-Face with base, or C-Face without base
- Meets IP55 enclosure protection
Starting at
$446.00
(191202.00)
Leeson Washguard White Duck
New!
Washguard White Duck motors from Leeson have a white epoxy finish that adds superior chemical resistance in addition to withstanding harsh washdown applications.
- The original moisture-shedding "duck" motor
- Sizes up to 1-1/2hp
- 208-230/460 VAC
- Durable USDA-approved white epoxy finish
- Stainless steel shaft, conduit box cover, nameplate, fan guard
- Mounting options include C-Face with base, and C-Face without base
- Drains for all mounting orientations
- Meets IP55 enclosure protection
Starting at
$438.00
(113649.00)
Marathon SYMAX Permanent Magnet AC (PMAC)
New!
Marathon SYMAX permanent magnet AC motors (PMAC) can only be used with a VFD, and provide a smaller footprint and higher efficiency even at lower speeds and partial loads when compared with induction motors.
- Sizes up to 10hp
- 230/460 VAC
- 6 pole, Interior Permanent Magnet (IPM) construction
- 25% to 40% efficiency improvement vs. standard induction motor
- TENV/TEFC enclosures
- Constant torque from 0 to base speed
- Lower operating temperature for higher reliability
- Superior low speed torque and excellent torque linearity
- High power density (small footprint), low weight design
- Operation with VFD only - cannot be used with an across-the-line starter
Starting at
$523.00
(SY001)
*shipped standard ground or LTL (see Shipping Options for complete details and restrictions)
Note: Shipping restrictions on all large motors
- Due to weight restrictions, large motors must be shipped via truck and cannot be shipped to Hawaii, Puerto Rico or the Virgin Islands.
- "NEXT DAY" truck delivery options on motors are only available for a very limited number of in-stock items and are subject to regional limitations. Orders must be placed no later than 12:00pm (noon) Eastern time and... AN EXPEDITE FEE WILL BE CHARGED.
- Saturday delivery is NOT available for motors that must ship via truck (ground service).
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