Hi Hubert
Glad to hear that the belt drive and existing DC motor are to remain in use for the time being.
If you are going to spend real money on that VFD and associated motor then I would purchase them as a pair from an expert supplier. There are a number of factors that decide the actual performance delivered at the motor spindle. The specs you have pointed out, as far as I can see, do not give the full picture. For example the maximum speed and the lowest speed recommended. These parameters are used in the VFD along with others to define the motor protection features. The VFD will probably be capable of seeing off most motors by over driving it as the electronic parameter limits are designed for the widest possible range of applications. Motor manufacturers do not like to give these figures as they are rightly worried that their motors will be compared with those form other makers by users who do not necessarily appreciate the needs of matching the motor to the VFD for a given application. Both the VFD and motor manufacturer have application engineers to help potential customers. There are also outlets that specialise in providing proven pairings of motor and VFD and will tell you the performance that will be achieved and the settings.
A side issue is the large amounts of electrical noise these drives make and it would be a good idea to keep the leads very short and screened with metal conduit - flexible if you are not mounting the electronics on the head.
With the applications engineers time being free I suggest if and when you need to replace the DC motor you buy a matched pairing of VFD and motor.
Regards
Pat  |