About The Test Standard For Energy-saver For Lightly Loaded Motor

dear marke:

Now a lot of energy-savers for lightly loaded motor and electricity distribution networks, but many energy-saver are not so good , and product quality is low, so we must regulating the makets of energy-saver,and protect the consumer's benefits. so we must issue the national standards for these energy-savers,and these energy-savers must be tesed in lab before it propagation in the maket.
so I want to ask if there are test standard for these energy-savers in your country?

thank you
best regards

need advice: motor speed & voltage decrease

now ,we test the energy saving system for induction motor,we found the problem:when the motor work at light load,the energy saving system reduces the motor voltage,the important thing is the motor speed decrease a little too.


so my question is :are all the motor speed decrease a little when the voltage decrease? can it keep the motor speed constant when reduce the voltage?

thank you !