1922

Introduction of the revolutionary Vertical HOLLOSHAFT motor with ball bearings for the pumping industry

1924

Introduction of the U.S. Uniclosed motor aided by the partnership with Johnston Pumps. The motor featured a HOLLOSHAFT design for ease of pump impeller adjustment, thrust handling ball bearings, a non-reversing clutch, alternate mounting base sizes and shaft whipping protection.

1930s

Introduction of a streamline, weatherproof design called type CFU

1938

Introduction of the Lubriflush® lubrication, a transverse lubrication that forced new grease though the bearing, flushing out the old

1940s

Introduction of Reg-U-Lube® oil flow of 20HP and up

Introduction of an improved Verticlosed type CFU motor with Vis-O-Lube® flush type oil gauges, optional Ball-O-Matic backstops, choice of single or tandem thrust bearings for high or extra high thrust capacity proportioned to fit smaller pump heads

1947

Introduction of the new U.S. MOTORS® Streamway Verticlosed

1950s

Launch of the Holloshaft Right Angle Gear drives for deep well pumping

Introduction of the type HU HOLLOSHAFT motor

Introduction of the single phase Hollo® shafts

Introduction of the BALL-O-MATIC® for vertical HOLLOSHAFT motors. This non-reverse ratchet prevents reverse rotation within 4.5 degrees of rotation, has unlimited depth setting and can be used in explosion proof applications.

Introduction of Lubriport®, a visible oil indicator with a retractable fill opening

1962

New design for the HOLLOSHAFT is created and released. An additional rotating seal is added to protect the lower guide-bearing against the entrance of sand during handling and transportation

1963

Introduction of the RU HOLLOSHAFT featuring double-downdraft ventilation and a square shape that cools the entire motor while maintaining full weather protection

1970s

Launch of the VPI epoxy insulation system on 440 frame and larger. Introducing Class F and Class H insulation materials, 8000 and 7000 frames type HU and HV and Weather Protected II enclosure and also increasing voltage capability up to 6900V and thrust capacity up to 30,000 pounds

1980

Introduction of ALLGUARD® Motor Quality System combining the industry’s best motor winding protection with the latest advancements in motor bearing lubrication

1982

Introduction of the Energy Efficient HOLLOSHAFT motor

1991

Introduction of the Premium Efficient VHS to meet expanded DOE efficiency regulations

1993

Introduction of Inverter Grade® Insulation to protect motors against PWM waveforms produced by the ever-increasing use of VFDs for energy savings

1998

Launch of ModMax® 2000s

2000s

Added Inverter Duty Verticals with bearing and winding protections for modern VFDs

Expanded kit offerings for VHS

2002

Introduction of the new WPI & WPII VHS 5008 & 5012 frames with max HP of 1000

2005

Introduction of the new WPI VHS 447 frame with max HP of 350

2006

Launch of re-designed WPI & WPII VHS 5008 & 5012 cast iron frames

2008

Addition of WPI VHS 600HP 1800 RPM 460V stock rating

2011

Updated inverter duty VHS stock models to include shaft grounding and insulated upper thrust bearing, if 400 frame & larger

Launch of new WPI & WPII VHS 5813 cast iron frames with max HP of 1750

2013

Introduction of stock WPI VHS Inverter Duty models with 175% extra high thrust on 100HP through 350HP

Increased UL Listed Fire Pump certification on VHS motors from 449 frame to 5012 frame and includes inverter duty

Introduction of new TEFC VHS 5812 frame increasing max HP from 700 to 1100.

2015

Sinewave Optimized® Stock offering specifically designed motors to operate at single speeds.

2016

Launch of new TEFC VHS 6812 frame increasing max HP from 1100 to 2000

Launch of new WPI & WPII VHS 6813 cast iron frame with max HP of 4000

2018

Redesign of Weather Protected I VHS 449 frame increasing max HP from 450 to 500. Also, included new Weather Protected II enclosure and 30.5” base diameter option

2020

Launch of redesigned Weather Protected I VHS 5008 & 5012 frames with increased reed critical frequency

Launch of redesigned Weather Protected I VHS 320 through 445 frame, which included new LUBRIPORT® oil sight window, larger volume steel main conduit boxes, stronger screen material and tiedown provisions