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High-performance inverter-duty motors can handle lower speeds without overheating, and withstand the PWM output of an inverter (VFD). These motors are used in variable speed applications such as machine tools and packaging/converting equipment. Certain models may 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
$313.00
(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
$1,224.00
(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
$456.00
(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
$1,769.00
(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
$6,157.00
(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
$7,565.00
(Y571-A774)
Leeson Washguard SST
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
$581.00
(191202.00)
Leeson Washguard White Duck
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
$471.00
(113649.00)
Marathon SYMAX Permanent Magnet AC (PMAC)
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
$563.00
(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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