The History of Groschopp, Inc.

The rich history of Groschopp, Inc. begins in 1930 with a company called Wincharger. How did we get from Wincharger to Groschopp? Watch and find out.


From trucks to kitchen appliances, motors move our society forward. This advancement is only possible thanks to hardworking motor manufacturers, such as Groschopp Incorporated.

Founded in Sioux City, Iowa in December 1934, by John & Gerhard Albers, Cecil Parris, and Ernest Arndt, Wincharger Corporation pioneered the development of wind-powered generators for rural America. They drew the attention of Zenith Radio Corporation, who, by 1935, bought controlling interest in Wincharger. It was through these Wincharger generators that Zenith Radio Corporation marketed its radios, bringing radio to the rural areas of America.

Wincharger played an important role in World War Two by developing the Dyna Motor, which was used in military aircraft and ships. Just as Wincharger shaped a part of the American military force, the war also had an impact on Wincharger as a corporation, spurring it to become the world’s largest manufacturer of Dyna Motors and inverters. This growth allowed it to leverage its success, and expand into motors and farm generators in the 1950s post-war economy. Wincharger proved its distinction as a motor manufacturer by receiving five Army Navy E-awards for excellence as a quality supplier.

In 1968, Dyna Technology purchased the Wincharger division from Zenith, relocating the small motor operations to Sioux Center, Iowa, a few years later.

In 1980, a German based manufacturer of small motors and gear drives, Groschopp GmbH, purchased the small motor division of Dyna Technology and named it Groschopp Incorporated. In 1996, a family trust from Germany acquired all company stock from Groschopp GmbH. The Sioux Center plant has retained the Groschopp Incorporated name, but operates independently from the Groschopp GmbH operations in Europe.

Changes in ownership over the years have not slowed down the demand for Groschopp motors, as evidenced by expansions in 1985, 1998, 2002, 2003, 2006, and 2011, to the original 37,000 square-foot plant, which was built in 1975. Groschopp currently operates a 100,000 square-foot plant in Sioux Center, which houses manufacturing facilities, warehousing facilities, engineering, sales, and support staff, employing approximately 200 people from across northwest Iowa.

For over three decades, the company has fostered a philosophy of steady growth and the highest quality standards to meet the demands of our most exacting OEM customers, including some of the world’s most famous brands. An ISO 9001:2008 registered company, Groschopp delivers expert technical assistance, superior product performance, and quality honed from over 70 years of workmanship and industry experience.

The people of Groschopp possess a unique commitment to quality, integrity, and involvement, and are dedicated to continual improvement. By surrounding this passion for excellence with state of the art equipment and manufacturing techniques, Groschopp continues to work hard to build upon its leadership in the fractional horsepower motor industry.

To learn more about Groschopp, visit our website at groschopp.com.

Additional Videos

How to use the Motor Search Tool

Narrow your search by selecting motor type, gearbox, voltage, and phase options for your desired motor.

Select a dominant variable: choose one of the three parameters to narrow your search. The selected variable determines which slider bar you will be able to manually move.

Use the slider corresponding to your dominant variable to further narrow your motor selection. The other sliders will automatically move to show available ranges based on the range of your selected variable.

Results will upload as your search criteria changes. If you have any questions regarding your results or how to use the search tool, you can chat with us using the green tab on the left-hand side of your screen.

Note: Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Selecting the Universal motor type will prompt a message taking you to the Universal product page.

Not sure what you need?

One of our team members would be happy to help. Contact us at 800-829-4135 or by email at sales@groschopp.com. You can also chat with us using the green tab on the left side of your screen.

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Universal Motors

Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Standard frame sizes and motor features can be found on the Universal page.

go to Universal page