Position hold control for a conveying process
AssigneeEaton Intelligent Power Limited
InventorsSteven Andrew Dimino, Zhe Zhang
Life of this patent
Estimating the term…
Abstract
A control apparatus for a conveying system includes: a control module configured to control a power converter coupled to a motor, and a modification module. The modification module is configured to: estimate a size parameter of an item conveyed by the motor, determine if a hold command is received; and if a hold command is received, modify one or more parameters of the control module based on the estimated size parameter of the item to thereby hold a rotor of the motor at a rotor hold position.
Claims17
A control apparatus for a conveying system, the control apparatus comprising:
- a control module configured to control a power converter coupled to a motor;
- and
- a modification module configured to:
- estimate a size parameter of an item conveyed by the motor;
- determine if a hold command is received;
- and
- if a hold command is received, modify one or more parameters of the control module based on the estimated size parameter of the item to thereby hold a rotor of the motor at a rotor hold position.
A method comprising:
- generating a motor driver signal for a motor by controlling a power converter with a switching signal, wherein the switching signal is determined by a control scheme associated with one or more control parameters;
- receiving an indication of a load on the motor as the motor conveys an item through a zone;
- estimating a size parameter of the item based on the indication of the load;
- receiving a hold command when the item is at a location in the zone;
- and
- after receiving the hold command, modifying one or more of the control parameters based on the estimated size parameter, wherein modifying the one or more of the control parameters modifies the motor driver signal such that the motor holds the item at the location in the zone.
A system comprising:
- a power converter configured to drive a motor, the power converter comprising a plurality of controllable switches;
- and
- a control apparatus comprising:
- a control module configured to generate a switching signal for the power converter, wherein, when applied to the power converter, the switching signal controls a state of the controllable switches to produce a motor driver signal;
- and
- a modification module configured to:
- determine if a hold command is received while the item is at a location in a zone associated with the motor;
- if a hold command is received:
- estimate a size parameter of an item conveyed by the motor;
- and modify one or more parameters of the control module based on the estimated size parameter of the item to modify the motor driver signal such that the motor holds the item at the location.
Dependencies are inferred from the claim text.