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High-performance inverter-duty motors handle low speeds without overheating, and withstand the PWM output of an inverter (VFD). These motors support variable speed applications such as machine tools and packaging/converting equipment. Certain models have encoder capability for use with vector VFDs.
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High-performance Inverter Duty AC Motors
Category Selection
For demanding applications that require more than just simple ON/OFF motor operation, inverter-duty motors paired with VFDs can provide the variable speeds and constant torque needed. These motors are specifically designed to withstand high temperatures at low speeds and higher voltage spikes when used with VFDs.
- Sizes from fractional horsepower up to 100hp, depending on series
- U.S. MOTORS ACCU-Torq series motors provide constant torque operation and work well with any VFD
- Marathon motors offered with our DURAPulse series AC Drives
- Leeson washdown-rated motors in TENV enclosures
- WEG S Series Vector Duty motors combine perfectly with WEG CFW series VFDs
- Toshiba EQP Global SD series are an excellent choice for severe duty applications
For part listings and specifications, go to Shop Now
Marathon microMAX™
- Sizes from ¼ 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
$310.00
(Y500)
U.S. MOTORS ACCU-Torq Series with and without Encoder
U.S. MOTORS ACCU-Torq motors are high-performance inverter duty motors specifically designed for precision speed control. They are easily paired with any VFD and are a great value.
- 230/460 VAC
- Rated outputs available: ½ to 20hp
- 1800rpm models up to 20hp with or without encoder
- 1200rpm models up to 10hp without encoder
- Encoder retrofit kits available
- NEMA premium efficiency
- Constant torque operation; zero to base speed on vector drives
- 5000:1 speed range
- Constant power (hp) operation to twice base speed
- Optimized for operation with variable speed drives (VFDs)
- NEMA Design A
- Class F insulation
- Continuous duty at 40°C
Starting at
$370.00
(UN14T2BC)
Marathon MAX+ with Encoder
- Sizes from ½ 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
$1,208.00
(Y280)
Marathon Black Max® (with or without encoder)
- Sizes from ½ to 15hp on models with encoder
- Versions with or without Dynapar HS35 encoder
- TENV enclosure
- Used in any high performance application with closed or open loop VFD control
- Low Inertia design for extremely quick response
- For applications where full torque at zero speed is required
Starting at
$494.00
(Y592)
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
$779.00
(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
$530.00
(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
$633.00
(SY001)
WEG S series Vector Duty
WEG S series rolled steel, premium efficiency 3-phase vector duty motors are designed specifically for VFD operation for applications requiring 1000:1 constant torque turndown ratio
- 230/460VAC, 3 phase
- 1/2hp, 3/4hp, 1hp
- 1800rpm, 6000 Max rpm
- TENV, Foot mount Double C face
- Class H insulation with Spike resistant magnet wire and Class F Rise
- Constant torque operation from 0 to base speed (1000:1) on PWM Vector Drive
- Ready for encoder mount
Starting at
$450.00
(.5018NT3FVD56C-S)
Toshiba EQP Global SD Series
Toshiba EQP Global SD series motors use oversized 300-series bearings to withstand the most severe environments and ensure a very long life span.
- 230/460 VAC
- Rated outputs available: ½ to 100hp
- 1200, 1800, 3600 rpm models
- NEMA Premium Efficiency
- Oversized 300-series bearings
- Heavy-duty cast iron construction
- Class F insulation with Class B temperature rise
- Inverter duty
- TEFC or TENV enclosure
- IP55 protection
- Class I, Division 2, Groups A, B, C, D
Starting at
$396.00
(0014SDSR41A-P)
*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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