3-Phase AC Electric Oil Cooled Motor Drive Systems

Manufactured by HPEVS For Marine Industry

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Our "Original" AC Drive System For Golf Cars Just Got A Whole Lot Better With The Introduction of an Automatic Parking Brake!!

HPEVS Golf Car Drive Systems

The "ORIGINAL", and still the best AC drive system available for your golf car!
Now Our Golf Car Drive Systems Come With a 5 Year Warranty!!
We have Designed and Developed A Lithium-Ion Battery Kit For Golf Cars That Is Completely Integrated With The HPEVS Golf Car AC Drive Systems

144 Volt Automobile Systems

The Scion pictured has the first prototype!

Mining Vehicle Systems

Specialty motors designed and built for your specific applications!

To get information, please click on "Details" tab below.
96 Volt Automotive Systems

This is one of many systems available for auto conversions!

To get information, please click on "Details" tab below.
Motorcycle Systems


To get information, please click on "Details" tab below.
Utility Vehicle Systems

We have a drive system to fulfill your utility vehicle requirements!

To get information, please click on "Details" tab below.
Hosts Mike Brewer and Edd China From The TV Show Wheeler Dealers Teamed Up with EV West to Install a HPEVS Drive System Into a 1985 Maserati Bi Turbo

It is Amazing To Us To See What Can Be Done With Our Drive Systems! Here Is Yet Another Example!

The Folks at EV West Have Created a Vehicle with One of Our Drive Systems!

To get information, please click on "Details" tab below.

Diagnostic and Troubleshooting Documentation.

To obtain this information, please click on "Details" tab below.

We have added to our website dimensional drawings of the Curtis Instruments controllers.

These drawings can be helpful during the design phase of a project.

To get information, please click on "Details" tab below.

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HPEVS Drive Systems

Our are powerful, efficient and reliable. Find out what our drive systems can do for your project.
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Schematics, Instructions and Troubleshooting

To assist you, our customers, we have compiled all the documentation needed to wire, program and troubleshoot. The wiring diagrams include documentation for on-road vehicles, golf cars and hydraulic pump applications. Click on the graphic above to open the page with the information.

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What's New

We have included a variation of the AC-20 motor called AC-23! The motor is wound to produce higher torgue compared to the AC-20 motor! Please check AC-2X motor page for more information!
AC 2x Family of Motors

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AC Electric Oil-Cooled Drive Systems for Marine Applications

Added to the HPEVS family of motors are our NEW OIL COOLED MOTORS. The design of these motors allow for an oil to be circulated in and out of the motor via threaded ports in the end bells. HPEVS highly recommends using a Full Synthetic Transmission Fluid (ATF) that can be found at any auto parts supply shop. With the addition of an oil pump and an external oil cooler/heat exchanger, the oil can be cooled which will allow these motors to run cooler. The result is that these motors can achieve higher continuous horsepower ratings compared to air cooled motors in the industry.

These new oil cooled motors include a stainless steel frame, stainless steel shaft and anodized aluminum end bells/junction box to resists corrosion. The motors are developed around the AC-3X, AC-3Xx2 and AC-5X families and are designed with the marine industry in mind, but these motors can easily be adapted to any type of application.

Please keep in mind that this new oil cooled design was made with the marine industry in mind but it can be implemented into other types of vehicles including automotive, ground support vehicles and mining vehicles. On a marine vessel there is a constant flow of cool lake/ocean water that is supplied to the heat exchanger to cool the oil effectively. If these new systems are installed in anything other than marine, performance results may vary based on how cool the oil is returning to the motor.

Contact one of our to help you with all of your conversion needs.

OEM customers, please



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AC Oil Cooled

AC-34/AC-35 Motors

Applications: Marine, Light Automotive, Utility Vehicles, Ground Support Equipment and Mining Vehicles

HPEVS Oil Cooled AC-34/AC-35 Electric Motor

The HPEVS Oil Cooled "B" Face
Single or Dual Shaft
AC-34/AC-35 Electric Motors

AC Oil Cooled

AC-50/AC-51 Motors

Applications: Marine, Light Automotive, Utility Vehicles, Ground Support Equipment and Mining Vehicles

HPEVS Oil Cooled AC-50/AC-51 Electric Motor

The HPEVS Oil Cooled "B" Face
Single or Dual Shaft
AC-50/AC-51 Electric Motors

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