The motor quota refers to the total quantity and duration and sequence of output power and mechanical quantity specified by the motor manufacturer. This is includes the following typical cases:
(1) Continuous work quota;
(2) Short time working quota;
(3) Periodic work quota;
(4) Non-discrete constant load working quota.
Factors affecting motor quota:
(1) Heating and cooling conditions of electric machines;
(2) Motor structure form;
(3) Use environment;
(4) Cooling mode;
(5) Work system;
(6) Insulation class.
The most commonly used motor quota is the continuous quota, which defines the output power that can be sustained without breaking the prescribed limit.( The DC generator is expressed in KW, the alternator in a particular power factor KVA, and the motor in horsepower or KW.) For intermittent load, periodic load or load rate change, we can give the motor short time quota and define the load that can be carried within a specified time. The standard time limit for the short- term quota is 5 minutes, 30 minutes and 60 minutes.
Motor quotas also specify speed, voltage and frequency, as well as permissible voltage and frequency changes. However, in many motor applications, the load will be more or less in a larger range of cyclic changes.