Monitoring system
First Claim
1. A method of monitoring the instantaneous operating capacity of a non-continuously rated electric motor, comprising the steps of:
- storing an absolute maximum operating temperature and a predetermined maximum permitted operating temperature of a motor;
sensing an operating temperature of the motor;
indicating, in response to said steps of storing and sensing, the sensed operating temperature as lying;
a) within a safe operating range, below the predetermined maximum permitted operating temperature;
b) within a hazardous operating range, lying between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature; and
c) at or above a dangerous operating point lying at or above the absolute maximum operating temperature; and
operating a motor cut-out if the operating temperature of the motor exceeds the predetermined maximum permitted operating temperature, which cut-out can be manually overridden to enable continued operation of the motor in the hazardous operating range, but which cannot be manually overridden which the operating temperature of the motor reaches the absolute maximum operating temperature.
1 Assignment
0 Petitions
Accused Products
Abstract
A monitoring system for an electric motor including a temperature sensor (5) for monitoring the operating temperature of a motor, a memory (4) in which is stored the absolute maximum operating temperature and a predetermined maximum permitted operating temperature of the motor, and an indicator (6) for indicating the sensed temperature as lying: a) within a safe operating range, below the predetermined maximum permitted operating temperature; b) within a hazardous operating range, between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature; and c) at or above a dangerous operating range, lying at or above the absolute maximum operating temperature. The monitoring system further includes a recorder (93) for recording the number of times the motor is operating beyond the predetermined maximum permitted operating temperature and the number of times the motor is operated beyond the absolute maximum operating temperature.
-
Citations
14 Claims
-
1. A method of monitoring the instantaneous operating capacity of a non-continuously rated electric motor, comprising the steps of:
-
storing an absolute maximum operating temperature and a predetermined maximum permitted operating temperature of a motor; sensing an operating temperature of the motor; indicating, in response to said steps of storing and sensing, the sensed operating temperature as lying; a) within a safe operating range, below the predetermined maximum permitted operating temperature; b) within a hazardous operating range, lying between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature; and c) at or above a dangerous operating point lying at or above the absolute maximum operating temperature; and operating a motor cut-out if the operating temperature of the motor exceeds the predetermined maximum permitted operating temperature, which cut-out can be manually overridden to enable continued operation of the motor in the hazardous operating range, but which cannot be manually overridden which the operating temperature of the motor reaches the absolute maximum operating temperature.
-
-
2. A monitoring system for an electric motor comprising:
-
a temperature sensor for sensing the operating temperature of a motor over an operating range of the motor; memory means for storing an absolute maximum operating temperature and a predetermined maximum permitted operating temperature of the motor; indicator means, responsive to the temperature sensor and the memory means, for indicating the sensed temperature as lying; a) within a safe operating range, below the predetermined maximum permitted operating temperature; b) within a hazardous operating range, between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature; and c) at or above a dangerous operating range, lying at or above the absolute maximum operating temperature; and a cut-out which operates to interrupt a supply of power to the motor when the operating temperature of the motor exceeds the predetermined maximum permitted operating temperature, said cut-out further including a cut-out override which is effective between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification