Optimized brushless DC (BLDC) motor drive system

A drive system for a BrushLess Direct Current (BLDC) motor having poles implemented by separate coils that are activated in corresponding phases, comprising:

• a) a controller for controlling levels and phases of input voltages supplied to said separate coils;
• b) a controlled inverter with outputs, for applying phase separated input voltages to each of said separate coils at desired timing for each input voltage, determined by said controller;
• c) a power source for feeding power to said controlled inverter;
• d) an up/down DC-DC converter for converting said feeding power to said input voltages according to a command signal provided by said controller,
• said controller is adapted to:
• e) sample an instantaneous angle φ of the rotor of said BLDG motor;
• f) sample the input voltage yin and a current I of each phase to obtain an input power P;
• and
• g) for each motor type, generating and storing, in a memory, a look-up table said controller is adapted to:
• h) sample an instantaneous angle φ of the rotor of said BLDG motor;
• i) measure the input power P to all phases;
• and
• j) for each input power P of a motor type, retrieve from a look-up table containing a phase difference value Δφ that corresponds to each value of input power P, a corresponding phase difference Δφ value between one of the input voltages and others input voltage;
• k) and feed said phase difference value to said up/down DC-DC converter, thereby causing said up/down DC-DC converter to apply each Vin to its corresponding coil at a specific timing for obtaining an optimal match between said each Vin and the current that is being built up in said corresponding coil.