Hello all,
A ploblem is here that we need the parts strong at some level but can not too strong as bad effect.
the failure appears when a sudden stop applied on drive shaft, then this shock torque from shaft will be transfered to a planetary reduction gear,then the gear will be broken.
Between...
Hello all,
A ploblem is here that we need the parts strong at some level but can not too strong as bad effect.
the failure appears when a sudden stop applied on drive shaft, then this shock torque from shaft will be transfered to a planetary reduction gear,then the gear will be broken.
Between...
Hi all,
I meet a problem on the ripple current of DC brush motor.
First,our customer require that the RMS ripple current is between a maximum value and a minimum value. Second,the sum power of foundermental frequency has a minimum value(ratio,compared to the whole power). At last,the sum power...
Thanks for your suggestion. Actually I'm not sure that when I change the 2 sensors to 3 sensors and use a trapezoidal controller to drive the motor, the result would be what? its out power increase some,torque ripple increased,etc? sensorless controller may could drive the motor also. But,and...
Hi all,I get a brushless permanent magnet motor used on autobike, with 2 hall sensor, but 3 phase of delta connection.
its back EMF is sinusoidal well. And I know most of BLDC motor use 3 hall sensors to detect the rotor position and sent the signal into controller. also its back EMF is...
Hi,all
I meet a problem of antiwater seal.
The customer ask to protect the hign speed motor(duty: 11000rpm/8hours) from water. The test method is just putting the motor in water statically. the water height is OK when it can cover all of the motor.The testing time is 5 minutes.
Many methods...
All,
Thanks very much to all of you. The cause have been found out finally and no problem in motor, but a unbelievable mistake in the test dynamometer. Much time on motor but finally not it, a lesson to me!
Sreid,
Thank you. In fact I have try two rotors. I'll check the armature.
Burnt2x,
Yes. I have moved the four brush about 1Min-6Max degrees in CCW or CW direction but no effect. I'll check the tension again, also the brush.
Thank you.
Hi Dick,
Thank you. Sorry I donn't describe the motor clearly. This motor is separate field motor. Two shunt-wound of two series-wound of field pole windings are here. And pls see the enclosed file. I just exchange the A1 and A2 lead connected to power...
Hi,
We meet a problem on a DC motor. We adjust the brush position OK by same speed at CW&CCW direction with non_load. But only one direction is OK if judged by spark and torque between brush and commutator bar with load on(15N.m/1000rpm). In aother direction the spark is very violent...
Yes.That's what I want to know how to calculate and test it, and send it to the controller designer,they want the curve to optimize their controller. I don't know the controller drive,maybe a DCVV system.
thank you.
Sreid,
I undertand now.Thanks.
And I still have a question about the curve as below. There is a sample curve about If & Ia. Pls see "http://e.simwe.com/28116/viewspace-5831". It show that the minimum If keep same and the Ia get bigger,then the curve become inclined and at last it go to...
Hi all,
i have a problem about the test method and calculation method of field map about the Ia(armature current) & If(separate pole winding current) of DC Motor.our customer need that field map. The field map is to describe the disabled working area by If & Ia curve. For example when If...
