Rotation Control Device and Construction Machine

A swing control device that controls a rotary body rotated by an electric motor, the swing control device performing operations including:

• determining whether a disturbance is applied to the rotary body or not;
• when applied, driving the electric motor with a first torque command value;
• and
• when not applied, controlling the electric motor to be driven with a second torque command value, an absolute value of the second torque command value being larger than an absolute value of the first torque command value.

A construction machine, comprising:

• a rotary body rotated by an electric motor;
• and
• a swing control device that controls the rotary body,
• wherein
• a velocity command value generated to rotate the rotary body at a predetermined target velocity is substantially constant, and
• an absolute value of a second torque command value generated based on the velocity command value when the velocity command value is changed is controlled to be larger than an absolute value of a first torque command value generated based on the velocity command value when a measured velocity of the rotary body is changed.

A construction machine, comprising:

• a rotary body rotated by an electric motor;
• and
• a swing control device that controls the rotary body, the swing control device performing operations including:
• determining whether a disturbance is applied to the rotary body or not;
• when applied, driving the electric motor with a first torque command value;
• and
• when not applied, controlling the electric motor to be driven with a second torque command value, an absolute value of the second torque command value being larger than an absolute value of the first torque command value.