Large DC Brushed Motors

These motors are very commonly used in china in large electric trikes. They are a common means of transporting people and goods.

They range in voltage from 36v up to 60volt. The motors are of the type which has no permanent magnets and uses copper windings to generate the magnetic field of the stator in the same manner as many car starter motors. This does mean that the efficiency is lower than motors using neodymium magnets but they are very rugged construction and affordable for small ev projects. The efficiency would likely be about 70% maximum ( my guesstimate I haven't been able to acquire any torque graphs of these motors as yet ).

The motor has a planetary gear system in it as shown below, the gears are extremely heavy duty. Gear ratio is 2:11. Motor rpm is 3,200rpm at 60v, after gear reduction max rpm is approx 640rpm.

It may also be possible to use the motor without the planetary gear system and drive a small electric vehicle via a gearbox ( possibly small car conversion?).
The motor is rated at 3,200rpm at 60volts. It may be possible to overvolt the motor, the controller that comes with the motor can be overvolted and run on 72volts ( I have used the controller at 72volts/50amps on a different motor), but the motor might prove to be useable in a number of applications.

Below the drive cog coming directly off motor shaft ( with planetary gears removed is shown)

The motor has very large brushes and the ponytail wire of brushes is designed for high amp applications.

Brushes are very easily accessible by removed the cover as shown below which is held in place by a spring and can be expanded and cover taken off very easily.

There is a dual chain cog which goes on the motor axle. The cog suits a standard motor bike chain.

The two sprocket cog is locked by a keyway ( axle doesn't show keyway slot in pic of left, it is on the underside)

Picture below shows how the motors are normally used, driving a rear axle via a differential with a dual chain.

Also included in the kit is a heavy duty controller on/off button. Its basically a manual relay but is used on the foot brake lever of some of the chinese trikes, so needs to be heavy duty. Its function is same as the brake handles cut off switches on ebikes which turn off the controller when the brake is applied.

Below shows the brake cut off relay insides.

A high amp relay which runs off the same voltage as the motor is also included. This is used as the on/off switch for the motor current.
 

beware of spray ebike company: more info