Motor driving control apparatus and method, and motor using the same

1. A motor driving control apparatus comprising:

an inverter unit applying a driving current to a motor apparatus according to a driving control signal;

a back-electromotive force detecting unit detecting back-electromotive force generated by driving of the motor apparatus;

a driving current change unit determining a resistance value in inverse proportion to a level of back-electromotive force and adjusting the driving current with reference to the resistance value, wherein the driving current change unit includes a plurality of resistors connected to one another in series and opens/closes at least a portion of the plurality of resistors to reflect the resistance value in the driving current; and

a controlling unit performing a control operation to change the driving control signal using the driving current in which the resistance value is reflected and the back-electromotive force.

2. The motor driving control apparatus of claim 1 , wherein the plurality of resistors connected to one another in series are configured in a ladder structure, in which the plurality of resistors are connected to a plurality of switches in parallel, respectively.

3. The motor driving control apparatus of claim 1 , wherein the driving current change unit includes a change controller receiving the back-electromotive force from the back-electromotive force detecting unit and determining the resistance value to be in inverse proportion to the level of the back-electromotive force.

4. The motor driving control apparatus of claim 3 , wherein the driving current change unit further includes a variable resistor including a plurality of resistors connected to one another in series and operated to switch at least a portion of the plurality of resistors connected to one another in series according to a control signal of the change controller to have the resistance value.

5. The motor driving control apparatus of claim 1 , wherein the driving current change unit pre-stores information on a plurality of predetermined differential resistance values according to a range of levels of the back-electromotive force and determines a resistance value corresponding to the range of levels of the back-electromotive force input from the back-electromotive force detecting unit using the information.

6. The motor driving control apparatus of claim 1 , wherein the controlling unit adjusts a duty ratio of the driving control signal provided to the inverter unit according to the driving current in which the resistance value is reflected.

7. The motor driving control apparatus of claim 1 , wherein the controlling unit controls the driving signal generating unit to perform phase commutation at a zero-crossing point of the back-electromotive force.

8. The motor driving control apparatus of claim 1 , wherein the controlling unit determines a phase commutation point of the motor apparatus using the back-electromotive force and controls generation of the driving control signal using the determined phase commutation point.

9. A motor comprising:

a motor apparatus including a plurality of coils; and

a motor driving control apparatus controlling current provided to the plurality of coils to control driving of the motor apparatus,

wherein the motor driving control apparatus includes:

an inverter unit applying a driving current to the motor apparatus according to a driving control signal;

a back-electromotive force detecting unit detecting back-electromotive force generated by the driving of the motor apparatus;

a driving current change unit determining a resistance value in inverse proportion to a level of back-electromotive force and adjusting the driving current with reference to the resistance value, wherein the driving current change unit includes a plurality of resistors connected to one another in series and opens/closes at least a portion of the plurality of resistors to reflect the resistance value in the driving current; and

a controlling unit performing a control operation to change the driving control signal using the driving current in which the resistance value is reflected and the back-electromotive force.

10. A motor driving control method performed by a motor driving control apparatus controlling driving of a motor apparatus, the motor driving control method comprising:

detecting back-electromotive force generated by initial driving of the motor apparatus;

comparing a level of the back-electromotive force with a preset value and determining a resistance value in inverse proportion to the level of the back-electromotive force when the level of the back-electromotive force is equal to or less than the preset value; and

reflecting the resistance value in the driving current of the motor apparatus and limiting an increase in the driving current at the time of the initial driving of the motor apparatus.

11. The motor driving control method of claim 10 , wherein the determining of the resistance value includes storing information on the resistance value preset according to a range of levels of the back-electromotive force.

12. The motor driving control method of claim 10 , wherein the motor driving control apparatus includes a variable resistor having a ladder structure in which a plurality of resistors connected to each other in series are connected in parallel to a plurality of switches, respectively.

13. The motor driving control method of claim 12 , wherein the determining of the resistance value includes generating a resistor control signal for switching at least a portion of the plurality of resistors connected to each other in series to correspond to the resistance value.

14. The motor driving control method of claim 13 , wherein the limiting of the increase in the driving current includes switching at least a portion of the plurality of resistors connected to each other in series according to the resistor control signal to reflect the resistance value in the driving current.