A variable frequency drive is an electronic device that allows you to start, stop, and control the speed of a three phase motor. It is also a motor starter as it is equipped with overload protection. Read more »
What is the difference between a 'new surplus' motor and a 'factory new' motor?
Our New Surplus electric motors and drives are new and unused overstock or discontinued items offered at lower prices and come with our 90-day warranty.
Factory New products are competitively priced and come with a manufacturers warranty.
Variable frequency drives (VFDs or inverters) now play an important part in major industry.
Within the last 10 years they have been perfected to control and vary the speed of 3 phase electric motors. They serve many purposes, besides speed control. Homeowners and hobbyist alike, who have lathes or milling machines with a 3 phase motor, usually don't have 3 phase power to operate. These VFDs (instead of using a rotary phase converter) can now be used to convert single phase power to 3 phase power. Read more »
Bearings: Roller Bearing on Drive EndService Factor: Three Phase 60 Hz 1.15 Service Factor (Continuous); 1.0 with VFD; 50 Hz 1.0 Service Factor (Continuous)
Insulation: Class F
Temperature Rise: Class B
NEMA Design A: Torques Equal or Greater Than 150% Starting Torque / 250% Breakdown Torque
Construction: Cast Iron Frame; End Brackets; Pressed Steel Main Conduit Box and Fan Cover
Grounding Terminal: Inside Main Conduit Box with additional foot mounting provision
Conduit Box: Oversized Main Conduit Box Rotatable in 90 Degree Increments - F1 Mounted
Ambient Temperature: Designed for < 40°C
Elevation: Designed for < 3300 ft. Elevation
Rotation: Bi-Directional
Shaft: High Strength 4140 AISI Steel
Rotor Construction: Aluminum Die Cast Squirrel Cage
Paint System: Phenolic Rust Proof Base Plus Polyurethane Top Coat
Paint Color: Dark Gray - Munsell 7.5 BG 3.5/0.5
Bearings: High Quality Ball (or Roller) Bearings Regreasable with Mobil Polyrex™ EM Grease
Fittings: Automatic Grease Discharge Fittings
Labyrinth Type Metal Flinger on Both Ends
Cast Iron Inner and Outer Bearing Caps
Nameplate: Stainless Steel Nameplate
VFD: Suitable for Inverter Duty (PWM - Pulse Width Modulation) per NEMA MG-1 Part 30(4 and 5)
Inverter Duty Speed Range: 20:1 Variable Torque / 10:1 Constant Torque (350 HP and Larger are 3:1 Constant Torque)
6 Leads for 150 HP and Larger
Protection: Standard With Thermistors (PTC 140°C) 1 per Phase
Locknut and Washer on NDE for Vertical Shaft Down Applications on F# 440 and Larger
Drain Holes / Plugs on Both End Brackets for Vertical Applications
Threaded One Way Breather Drains for Horizontal Mount Applications
Precautions should be taken to eliminate or reduce shaft currents that may be imposed on the motor by the VFD as stated per NEMA MG-1.
Note: Stock catalog image shown. Actual motor may differ.
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