Linear motor device and method for controlling linear motor device

A linear motor device, comprising:

• a linear motor, and
• a control unit configured to apply a pressure to a pressurizing object by causing a movable part of the linear motor to move,
• wherein, the control unit, after causing the movable part to move toward the pressurizing object at a predetermined first speed based on position control, controls the movable part to move by performing deceleration to a second speed which is slower than the first speed and at which the pressure applied to the pressurizing object is less than or equal to a predetermined pressure when the movable part starts to apply the pressure to the pressurizing object,
• the control unit causes the movable part to move at the second speed until a current flowing through the linear motor is greater than or equal to a predetermined current limit value,
• wherein the control unit further comprises an electric angle correction unit configured to correct an electric angle corresponding to a magnetic pole position of the movable part based on a ratio of a load applied to the pressurizing object to a maximum thrust force of the linear motor, and
• wherein the control unit causes the movable part to move based on the electric angle corrected by the electric angle correction unit.

A linear motor comprising:

• a linear motor, and
• a control unit configured to apply a pressure to a pressurizing object by causing a movable part of the linear motor to move,
• wherein, the control unit, after causing the movable part to move toward the pressurizing object at a predetermined first speed based on position control, controls the movable part to move by performing deceleration to a second speed which is slower than the first speed and at which the pressure applied to the pressurizing object is less than or equal to a predetermined pressure when the movable part starts to apply the pressure to the pressurizing object,
• the control unit causes the movable part to move at the second speed until a current flowing through the linear motor is greater than or equal to a predetermined current limit value,
• wherein, the control unit, after starting the deceleration from the first speed to the second speed, switches a control gain to that of a value which is greater than a control gain used when causing the movable part to move at the first speed.

A method for controlling a linear motor device comprising a linear motor and a control unit configured to apply a pressure to a pressurizing object by causing a movable part of the linear motor to move, the method comprising:

• controlling, after causing the movable part to move toward the pressurizing object at a predetermined first speed based on position control, the movable part to move by performing deceleration to a second speed which is slower than the first speed and at which the pressure applied to the pressurizing object is less than or equal to a predetermined pressure when the movable part starts to apply the pressure to the pressurizing object;
• and
• causing the movable part to move at the second speed until a current flowing through the linear motor is greater than or equal to a predetermined current limit value, wherein
• after starting the deceleration from the first speed to the second speed, switching a control gain to that of a value which is greater than a control gain used when causing the movable part to move at the first speed.