Machine press motor load monitor
AssigneeThe Minster Machine Company
InventorDan Klosterman
Life of this patent
Estimating the term…
Abstract
A current monitoring system for an electric motor, whereby the current is halted to the motor if the electrical load exceeds calculated electrical load limits. The system includes a current measuring device, sensors for detecting operational functions, a system for setting an electrical current limit setpoint, and a switch for halting application of electrical current to the motor. A method of halting an electrical motor if the electrical load exceeds a calculated electrical current limit is also disclosed.
Claims35
An apparatus for monitoring an electric motor in a machine environment, the apparatus comprising:
- a current detector means for measuring current draw of said electric motor;
- a operational sensor means for detecting operational functions occurring in said machine environment;
- a means for providing a limit setpoint based upon the operational function detected by said operational sensor means;
- a comparator means for comparing the limit setpoint to the measured current draw;
- and
- a means for controlling the operating state of said motor in accordance with the results of the comparison performed by said comparator means.
A method of monitoring a press machine motor supplied with electrical current, said method comprising the following steps:
- (a) detecting operational functions which contribute to an electrical load on the motor;
- (b) setting a limit setpoint based on detected operational functions;
- (c) determining the electrical load on the motor;
- (d) comparing the determined electrical load to the limit setpoint;
- and
- (e) deactivating the motor if the determined electrical load exceeds the limit setpoint.
A method of monitoring a motor in a press machine environment, said method comprising the following steps:
- (a) setting a limit setpoint based on press operational functions occurring in said press machine environment which affect electrical load on the motor;
- (b) determining the electrical load on the motor;
- (c) comparing said determined electrical load to the limit setpoint;
- and
- (d) deactivating the motor if said determined electrical load exceeds the limit setpoint.
An apparatus for monitoring a press drive motor in a machine environment, the apparatus comprising:
- a current detector means for detecting electrical current draw of the motor;
- a first means, responsive to the occurrence of at least one operational event in said machine environment, for providing a limit setpoint based upon the occurring operational event;
- and
- a means for deactivating the motor if the detected electrical current draw exceeds the limit setpoint.
A system for use with a drive motor in a machine environment, comprising:
- measurement means for providing a measure of the load on said drive motor;
- detection means for detecting the occurrence of at least one operating event in said machine environment;
- means for providing a limit setpoint based upon the operating event detected by said detection means;
- and
- means for comparing said limit setpoint with said load measurement.
A method for use with a drive motor in a machine environment, comprising the steps of:
- providing a measure of the load on said drive motor;
- detecting the occurrence of at least one operating event in said machine environment;
- defining a limit setpoint in accordance with the detected operating event;
- and
- comparing the limit setpoint with the load measurement.
Dependencies are inferred from the claim text.