Motor unit and multi-motor system

A multi-motor system comprising:

• a plurality of motor assemblies including first, second, and third motor assemblies;
• and
• a communications network connecting the plurality of motor assemblies;
• each of the plurality of motor assemblies including:
• a motor;
• a control circuit to generate a control signal that causes the motor to rotate;
• a driving circuit to cause a current to flow in the motor based on the control signal;
• a storage to store an identifier uniquely identifying the motor within the communications network;
• and
• a communication circuit to perform communications via the communications network;
• wherein
• the control circuit of the first motor assembly:
• generates a first command including:
• an instruction to cause status information indicating a state of the receiving motor assembly to be transmitted;
• an identifier that identifies a motor of the third motor assembly being a receiving end of the status information;
• and
• a transmission timing of the status information;
• and
• transmits the first command to the second motor assembly via the communication circuit;
• and
• the control circuit, having received the first command second motor assembly, transmits a second command including the status information of the second motor assembly to the third motor assembly based on the first command and with the transmission timing.

A multi-motor system comprising:

• a plurality of motor assemblies;
• and
• a communications network connecting the plurality of motor assemblies;
• each of the plurality of motor assemblies including:
• a motor;
• a control circuit to generate a control signal to cause the motor to rotate;
• a motor driving circuit to cause a current to flow in the motor based on the control signal;
• a storage to store an identifier uniquely identifying the motor within the communications network;
• and
• a communication circuit to perform communications via the communications network;
• wherein
• the respective identifiers of the plurality of motor assemblies are assigned by a predetermined order;
• and
• one specific motor assembly that is determined according to the predetermined order arbitrates the communications to be performed within the communications network.