| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control unit that can be applicable to both of linear and rotary types and can estimate an initial magnetic pole position with high precision and a small amount of computational complexity even if disturbance, such as friction, exists. <P>SOLUTION: A phase angle command operation means 7 includes a function for controlling a current based on a prescribed current command value to set a phase angle command value to a fixed value (for example, zero) in an excitation mode for exciting a motor 3 when turning on power, a function for increasing the phase angle command value from the fixed value in accordance with a ramp function from the stop state of the motor 3 in a subsequent operation mode, a protection function for inverting the phase angle command value by 180 degrees when a travel direction of the motor 3 is inverse to an estimated direction, and a speed restriction function for reducing an increase rate of the phase angle command value when the travel speed of the motor 3 reaches or exceeds a limiting value. The phase angle command operation means 7 changes the phase angle command value until a prescribed time or an amount of angle is reached, and allows a magnetic pole position of the motor 3 to coincide with a position of an application voltage. <P>COPYRIGHT: (C)2011,JPO&INPIT |
