Hi everyone!!
I had like to ask if it is possible to change a resolver if necessary? I rephrase i know that the resolver works like e rotary transformer and give an analog signal <VS and VC> V sin, Vcos, and the question is if for some reason the resolver is damage its is possible to us change the resolver in way that don't compromisses the god working of the servo, this is if will be sincronysed with the servo windings.
Best regards zer0.
Hi! At first i'm gratefull for your attentions; At moment it is not possible to answer to your questions because i must wait for the momemt for an preventive programeted maintenance in one machine. But i will pay attention and as soon as possible i try post the measures. I have resolvers that in the place of the shaft is a hall and so the rotational part is mounted directly on the motor shaft. When you mean powered the resolver you meaning feed the resolver by the motor drive? I ask, because in his condition the motor is blocked on the position until he receives order to start, and if i try move the shaft he motor spins untill get is position again, this could be a dangerous task.Exist an alternatif way to take this task foward? When i had to interview in one servo i use a temporary mark for dismount a resolver for change the servo bearings, and for now i have been sucessed.
best regards Zer0
Hi zero,
The reference winding for most resolvers (like size 11) usually has operating voltage that can be any value between 5 and 26 V rms. Frequency usually is between 1KHz to 10KHz. Some can be as low as 400 Hz, these low frequency units are usually used in aircraft application.
In a typical resolver, if you measure with a DVM the output of either the cos or sin winding while you rotate the shaft one complete revolution starting from a reading of close to zero Vrms, you will observe that the reading will increase then decrease close to zero, then increase and decrease again back to close to zero. If you plot, this voltage versus shaft angular rotation, the plot will be two half sines. One of the half sine should be opposite the other half about the zero volt axis in the plot giving you a complete cycle. Resolver manufacturers use various measuring equipment better than a DVM. see www.naii.com/.../viewProduct.aspx
For the above example, one electrical cycle occurs in one mechanical rotation. This resolver is said to have a 'speed' of 1X. So, a 2X 'speed' resolver will have two electrical cycles in one mechanical rotation, etc.
Wishing you well with your project.
LLH B. Picket (MSc)