Vex victor bb 300a pwm motor speed controller vex 217 4891 p the vex victor bb has been designed from the ground up for combat robotics use but also has numerous other applications where a high continuous current rating is required the fan less design is based on over 15 years of combat robot experience with vex s main objective being to produce the best performing most durable and lightweight speed controller possible p p the speed controller can be quickly switched from brake to coas