Simple Circuit Schematic Brushless DC Motor Driver using LM741 and MOSFET IRF3205

Eltronicschool. - This is one of the simple circuit schematic of brushless DC motor driver with case study hard disk motor like in Figure 1 below. In this circuit based on some components like LM741 op-amp and IRF3205 MOSFET. (You also can read: Circuit Schematic 12V LDO Solar Charge Controller using MOSFET)

Circuit schematic

Figure 1. Simple Circuit Schematic Brushless DC Motor Driver using LM741 and MOSFET IRF3205 (Source: Prinsipkerja)

Component Parts

1. LM741 IC
2. MOSFET IRF3205 or IRF740
3. Resistors
4. Capacitors
5. Brushless motor

Description

Circuit schematic like in Figure 1 above is Simple Circuit Schematic Brushless DC Motor Driver using LM741 and MOSFET IRF3205. According Prinsipkerja site describe that this circuit works only on a hard drive or BLDC (brushless dc motor) which has four pins (3 phase signal and one common), and for motors with 3 pin can not use this circuit. In the above schemes exist points A, B, C and D are connected to the BLDC motor, may be any hard drives have different pin configurations but as this reference pin placement is used..

Work principle:

IC LM741 is an Op-amp, which is used as a voltage comparator. At the time the motor is rotated by hand using a motor disk itself produces a small electric fed to input-1 op-amp that resulted MOSFET on and then the motor moves the motor movement resulted in the induction coil further that then produces electricity that is fed to input-2 which resulted MOSFET off, this process keeps repeating and causing motor spinning faster and faster until it reaches the maximum speed. Read more here.