The motor control device includes: a control signal generation unit 512, generating a motor control signal for supplying drive power to a drive motor 60; an advance angle value setting unit 514, setting a control advance angle value a for advancing a phase of the motor control signal; and an operation state detection unit 513, detecting an operation state of the opening and closing body. The advance angle value setting unit 514 sets the control advance angle value a in accordance with the operation state of the opening and closing body detected by the operation state detection unit 513.

A system for detecting the movement conditions of the leaf closing a barrier, the leaf being able to occlude a delimited opening or passage and in which the leaf itself is moved by a motor whose rotation shaft is associated with a motion transmission mechanism to the leaf. On the motor is present a first device for measuring the rotation of the rotation shaft, and a second measuring device is associated with a second rotation shaft being connected to the first shaft by a reduction gear with a reduction ratio that is non-integer.