Sunday, May 1, 2016

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

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

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.

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