We Know Electric Motors Inside & Out

At Lewis Motor Repair we have been setting the standard for electric motor repair since 1969.

Our repair services at Lewis Motor Repair are all encompassing and include testing, repair, and rewinds for small, large and extra-large AC and DC electric motors and mechanical systems. From shop repairs to on-site apparatus servicing, we are capable of executing your repair needs in a professional and cost-efficient manner 24 hours a day, seven days a week (24/7).

Shop Capabilities

Fully Equipped Electric Motor Rewind and Repair Facilities.

  • Up to 2500 HP AC & DC
  • DC Motor Repair
  • DC Armature Rewinding
  • Field Rewind
  • Hermetic Rewinding
  • Welder Repair
  • Pump & Gear Box Repair
  • DC Brush Holder Refurbishing
  • Slip Ring Rebuilding
  • Electronic PC Board Repair
  • AC & DC Testing to 5000 Volts
  • Surge Comparison Testing
  • MEG-OHM Testing
  • AC & DC Hi-Pot Testing
  • Armature Bar to Bar Testing
  • Rotor-Bar Testing & Repair
  • Dynamic Balancing
  • Motor Core Loss Testing & Repair
  • Generator Load Testing
  • Vibration/Alignment Analyzing
  • Electro-Magnet Coil Testing
  • AC/DC Coil Testing & Winding
  • Tachometer Testing & Repair
  • Medium Voltage Form Coil Rewinding
  • Spray Welding Metalizing Service
  • Spindle & Machine Tool Repair
  • CNC Coil Winding Machine
  • AC Induction Motors - Squirrel Cage & Wound Rotor
  • AC Synchronous Motors - Brushless & Slip Ring
  • AC Generators - Hdyro, Wind Turbine, Steam Turbine, Diesel Driven, Single, & 2 Bearing
  • DC Motors - Permanent Magnet, Series, Shunt, Compound
  • Specialty Motors - Vertical, Hermetic, Nuclear, Explosion-Proof, Servo
  • Voltage Ratings from Low Voltage to 4,160 VAC / 1,000 VDC
  • HP Ratings from Fractional to 5,000+ HP

Machine Shop Services

  • Commutator Mica Undercutting
  • Lathe Turning / Boring
  • Vertical Milling / Boring
  • Horiztonal Milling / Boring
  • Vertical Press up to 75 Tons
  • Keyseating
  • Flame Spray Metallizing
  • MIG / TIG Welding
  • Cryogenic Shaft Installation
  • Spray Welding
  • Ceramic Spray Welding / Resurfacing

Dedicated Small Motor Repair

Fully Equipped Electric Motor Rewind and Repair Facilities.

  • NEMA Motors
  • IEC Motors
  • Gear Motors
  • Servo Motors
  • Spindle Motors
  • Low-Voltage DC Motors
  • Small Definitive Purpose, Non-Stock Motors
  • Industrial & Commercial Power Tool Repair
  • Portable Generator Repair

Electronics Repair

  • Variable Frequency Drives
  • Soft Starts
  • Circuit Breakers
  • PLC's
  • VFD Start Ups
  • Soft Start Start Ups

Pump Repair

Markets served include municipal, industrial, commercial, and residential.

  • Axial Flow Pump Repair
  • Circulation Pump Repair
  • Cutter / Chopper Pumps
  • Fire Pump Repair
  • HVAC Pump Repair
  • Submersible Mixer Pumps
  • Booster Pump Repair
  • Grinder Pump Repair
  • Multi-Stage Pump Repair
  • Split Case Pump Repair
  • Submersible Pump Repair
  • Water Feature Pumps
  • Aeration Units

Gearbox Repair

All Industries utilize gearboxes in a variety of applications. Some industries, such as Plastics, power generation, distillation, cement and aggregate, paper mills, and the petrochemical industry, require high-torque gearboxes, which can provide continuous as well as noise-free performance. Grain, food process, beverage, as well as other industries all utilize similar type gearboxes. The durability and tolerance levels have to be specifically designed by keeping in mind the performance desired.

Types of Gearboxes:

  • Bevel
  • Helical
  • Offset
  • Planetary
  • Cyclo
  • Worm

Specialized Services

  • In House Dynamic Balancing - 4.5 ton capability
  • Custom Control Panel Fabrication
  • Electronic, Custom Fan & Custom Roller Balancing
  • Electro-Magnet Reconditioning & Rewinding
  • Custom DC Brush Ring & Brush Holder Parts Manufacturing
  • Medium Voltage Formed Coil Rewinding
  • Frequency Generator/Converter Rebuilding & MG Set Repair
  • Custom-Built Electric Motor Capabilities

Motor Modifications

Our in-shop MOD Center Program allows us to MOD Stock motors to meet your modified motor needs in a few days or less. With extensive stock motor offerings and 20+ unique motor modification programs available, we can "customize" a motor to meet your application needs.

Available Modifications

Shaft Grounding Systems
Variable frequency drives on AC and DC motors can induce harmful electrical voltages on the motor shaft. Once these voltages exceed the resistance of the bearing lubricant, they discharge through the motor's bearings causing severe pitting, fluting damage, bearing etching, and excessive bearing noise that will eventually cause bearing failure. Lewis Motor Repair can install shaft grounding systems to eliminate this issue.

Bearing Modifications
Change standard Shielded bearings to Sealed bearings
Change bearing type to low temperature bearing
Install insulated bearings to protect against stray voltage currents

Brake & Brake Motor Modifications
Change brake coil voltage

Cords, Plugs & Grounding Provision Modifications
Install grounded line cord on single-phase motors — without plug
Install 6-foot to 9-foot grounded type cord, with plug on single-phase motors
Add an additional grounding screw to NEMA 48 and 56 Frame motors

Switches – Power Plug or Electronic Starting
Install on-off switch to 2 HP and smaller single-phase motors. Includes double-pole, single-throw switch in conduit box with switch guard and 6-foot, S.O. type cord

Condensate Drains
Install one or two condensation drains on 215T and smaller rolled Steel motors
Install an additional one-way, stainless steel, condensation drain on 182T and larger cast iron motors

Add Drip Covers
Install a drip cover on steel frame or cast iron, ODP type, motors

Leads – Reconnect, Remark & Extend
Re-connect leads in the motor's conduit box
Re-mark motor leads using custom labels
Add Crimp-type terminal lugs to any frame motors
Add Polaris or other type insulated lead terminations

Shaft Seals
Install and oil seal on 215T and smaller steel frame motors

Install a C-Face Kit on a non-C-Face 48 through 449T frame motor
Install a D-Flange on a 182T through 445T cast iron motor
Convert standard F1 motors to F2, sidewall or ceiling mount
Re-locate conduit box on NEMA 56-145T frame motors
Install B5 or B14 Flanges on IEC motors

Replace existing motor's nameplate with new nameplate having customer's part number, re-rate volt or frequency
Replace standard motor's aluminum or plastic label type plate with custom aluminum plate

Repaint motor to another specified color paint

Space Heaters
Add anti-condensation space heaters to totally enclosed or open motors

Motor Protection
Add a thermostat or thermistor to an AC or DC motor

Fungus Proofing, Rubberizing & Tropicalization
Special treatment to the motor's windings and mechanical parts to resist tropical environments

Shaft Modifications

Tachometer Mounting Provisions – DC Motors

Terminal Blocks – NEMA Motors

Encoder Kits

Blower Fan Kits

Conduit Box Kits – Larger Size

Field Services

At Lewis Motor Repair we provide a comprehensive set of in-field services, allowing for quicker repairs. Our turnkey in-field services provide your operation with greater up-time and steady productivity. Provided on a local level — throughout central and greater Minnesota — and a regional platform — South Dakota, North Dakota, Iowa, and Wisconsin — our field service specialists perform high caliber electric motor repairs and support on all OEM brands.

Our On-Site Apparatus Services

Motor parts graphic

All Repairs Performed Meet the Standards Put Forth by