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DC motor/generator for hybrid drive system?

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JackF

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Hello all, I am currently designing a hybrid vehicle drive system which demonstrates the principles of hybrid drive for a project (not an actual vehicle compatible system) which utilizes a brushless DC motor/generator unit to both charge a battery, and power the drive train. The system is based on the Parallel hybrid drivetrain.

I am currious though as to how I can make the unit act as a generator and then be switched to act as a motor? As the battery is connected to the unit, there is no way of stopping the battery from driving the unit as a motor instead of receiving charge?

Thanks in advance for any help.
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Detailed information:

The drivetrain consists of a fixed axle, which can be hand turned to demonstrate the principal of ICE torque. A sprocket gear is to be mounted on the axle, with a chain linking to another gear attached to the motor/generator units shaft.
 
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The only difference between a DC motor and a generator is what it's connected to. Your existing motor control circuitry probably can't be modified to be used as a generator, but if you can tap the motors windings directly it comes out as polyphase AC. You just need to provide it a load and feed it into the battery. I'd think using a polyphase rectifier/transformer to get a decent load impedance (you really want a hard breaking effect) and then use the mosfets to turn the whole thing on and off to allow you to PWM the breaking effect. JUST like a motor speed controller, only in reverse.

Any help?
 
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