Synchronous control method and device of the same

A synchronous control method, for which a first and second motors are provided, and in which rotation phases of the first and second motors are synchronized,

• wherein first braking means for braking a rotation of the first motor is provided, and
• second braking means for braking a rotation of the second motor is provided, the method comprising the steps of:
• making the first and second braking means operate, in response to a stop instruction to the first motor;
• detecting rotation phases of the first and second motors at the time of restart;
• comparing the rotation phase of the second motor with the rotation phase of the first motor;
• and
• based on a result of the comparison, performing a home position alignment of the motor, at a start time of a subsequent operation.

A synchronous control device, which is provided with a motor and a central control unit generating a synchronous reference signal, and with which the motor is controlled to rotate synchronously with the synchronous reference signal supplied from the central control unit,

• the synchronous control device comprising:
• braking means for braking a rotation of the motor;
• motor rotation phase detecting means for detecting a rotation phase of the motor;
• and
• controlling means for performing control in such a manner that the braking means is activated in response to a stop instruction supplied from the central control unit;
• a required rotation phase of the motor is stored;
• at the time of restart the required rotation phase of the motor is compared with the detected rotation phase thereof detected by the motor rotation phase detecting means;
• and a home position alignment of the motor is performed at a start time of a subsequent operation, depending on a result of the comparison.

A synchronous control device, which is provided with a first and second motors, and with which rotation phases of the first and second motors are synchronized,

• the synchronous control device comprising:
• first braking means for braking a rotation of the first motor;
• second braking means for braking a rotation of the second motor;
• first motor rotation phase detecting means for detecting a rotation phase thereof;
• second motor rotation phase detecting means for detecting a rotation phase thereof;
• and
• controlling means for performing control in such a manner that the first and second braking means are activated in response to a stop instruction supplied to the first motor;
• at the time of restart the detected rotation phase of the first motor detected by the first motor rotation phase detecting means is compared with the rotation phase of the second motor detected by the second motor rotation phase detecting means;
• and a home position alignment of the second motor is performed at a start time of a subsequent operation, depending on a result of the comparison.