Brake actuator and electromechanical brake using the same and control method thereof

A control method of an electromechanical brake including a brake actuator provided in a disc brake to press or release a piston and controlled by an electrical signal, comprising:

• moving a ball pressing the piston through a pressing ramp portion to an initial position of the lowest point as a braking release point;
• setting rotational positions of first and second power generating units configured to convert electrical energy into mechanical rotational kinetic energy to a braking initial position after the moving the ball;
• determining braking force by comparing current corresponding to braking force in accordance with a driver's braking will with a reference value to supply the current to at least one of the first and second power generating units;
• and
• when the current corresponding to the braking force in accordance with the driver's braking will is less than or equal to the reference value, performing a first braking such that the first power generating unit operated by the current calculated in the determining braking force presses the piston directly through the pressing ramp portion.

A control method of an electromechanical brake including a brake actuator provided in a disc brake to press or release a piston and controlled by an electrical signal, comprising:

• moving a ball pressing the piston through a pressing ramp portion to an initial position of the lowest point as a braking release point;
• setting rotational positions of first and second power generating units configured to convert electrical energy into mechanical rotational kinetic energy to a braking initial position after the moving the ball;
• and
• performing parking brake in accordance with the driver's parking will such that the current is supplied only to the second power generating unit in a state where the current supplied to the first power generating unit is removed.