I have made a driver circuit for a sensored bldc motor using mc33035. This circuit is similar to the application circuit(given in fig.19 and fig 36) in the ic's data sheet. I have used TIP127 and TIP122 as upper and lower gate mosfets respectively. The frequency is determined by a 10kΩ resistor and 10nf capacitor. The current limiting is set for 4.25 A by using a 0.5Ω resistor and voltage reference of 2V given the the op-amp integrated in the given ic.
however I am having problem in starting the motor. The motor does not start on its own for some positions of the the rotor and also once I stop the motor by using brake or by making its speed 0, it does not start on its own. it also starts vibrating at some rotor positions.The motor runs well once i start the motor by hand. The motor has sensors at 120° and is a out-runner motor.
however I am having problem in starting the motor. The motor does not start on its own for some positions of the the rotor and also once I stop the motor by using brake or by making its speed 0, it does not start on its own. it also starts vibrating at some rotor positions.The motor runs well once i start the motor by hand. The motor has sensors at 120° and is a out-runner motor.