Motor drive with synchronized timing
AssigneeRockwell Automation Technologies, Inc.
InventorsRichard W. Piefer, Thomas J. Rehm, Takayoshi Matsuo
Life of this patent
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Abstract
A motor control system for controlling a motor includes control logic and a motor controller. The control logic is operable to generate a control signal at a first periodic time responsive to a synchronization signal. The motor controller is operable to generate a drive signal for the motor based on the reference signal at a second periodic time synchronized with respect to the first periodic time.
Claims23
A motor control system for controlling a motor, comprising:
- a first processor configured to generate a reference control signal at a first periodic time responsive to a synchronization signal;
- a second processor configured to generate a drive signal for the motor based on the reference control signal at a second periodic time;
- and
- wherein the second periodic time is delayed from the first periodic time by a first time interval associated with the time required for the first processor to generate the reference control signal and a predetermined delay interval selected to minimize a staleness of the reference control signal.
An electronic line shaft, comprising:
- a synchronization unit operable to generate a synchronization signal;
- and
- a plurality of drive units controlled in accordance with a common reference signal, each drive unit including:
- control logic operable to generate a torque reference signal at a first periodic time responsive to the synchronization signal, the torque reference signal being generated based on the common reference signal and at least one feedback signal;
- and
- a motor controller operable to generate a drive signal for the motor based on the torque reference signal at a second periodic time, the second periodic time being delayed from the first periodic time by a first time interval associated with a time required for the control logic to generate the torque reference signal.
A method for controlling multiple motors using a plurality of drive units controlled in accordance with a common reference signal, the method comprising:
- generating a synchronization signal;
- and
- responsive to the synchronization signal, generating a torque reference signal at a first periodic time;
- generating a drive signal for each of the multiple motors based on the torque reference signal at a second periodic time, the second periodic time delayed from the first periodic time by at least a first time interval required to generate the torque reference signal.
Dependencies are inferred from the claim text.