How to identify the quality of the motor? What are the key parameters?
Mainly the magnitude of no-load current and riding current, compared with normal values, and the efficiency and torque of the motor, as well as the noise, vibration and heat generation of the motor, the best way is to test the efficiency curve with a dynamometer.
What is the difference between a 180W and a 250W motor? What are the requirements for the controller?
The 250W riding current is large, which requires high power headroom and reliability of the controller.
Why is the riding current of an electric vehicle different in the standard environment depending on the rating of the motor?
It is well known that under standard conditions, the rated current is 160W, the riding current is about 4-5A on a 250W DC motor, and the riding current is slightly higher on a 350W DC motor. For example, if the battery voltage is 48V, the two motors 250W and 350W, the rated efficiency point is 80%, the rated operating current of the 250W motor is about 6.5A, and the rated working current of the 350W motor is about 9A. The efficiency point of the general motor is that the farther the operating current deviates from the rated working current, the smaller the value is. Under the load condition of 4-5A, the motor efficiency at 250W is 70%, and the motor efficiency of 350W is 60%. Under the load of 5A, the output power of 250W is 48V*5A*70%=168W, and the output power of 350W is 48V*5A*60%=144W.
In order to make the output power meet the riding requirement, that is, 168W (almost the rated load), only the power supply is increased, so that the efficiency point is increased.
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