Lehner Power Ratings Help

Keep in mind that most of this stuff is over my head, but I read someplace that the amp draw ratings of a motor are supposed to be the maximum constant draw of the motor when you apply the maximum voltage to the motor. The maximum voltage is the highest voltage that you can apply without exceeding the maximum rpms. The wattage rating of the motor, from what I understand, is what the motor is capable of producing with a capable power supply.