If I understand correctly, you have an AC power supply (wall receptacle for instance) and need to vary the speed of a DC motor? Further, the motor is rated at 130VDC? If so, this is fairly straightforward to do. Building a pwm controller is quite easy (esp since much of the work exists in many micros). The power electronics section might be more difficult. Does the pwm controller need to vary both motor speed and change direction? If your system is closed loop, you also need to consider how to determine the speed of the motor and feed it back into the control loop.