I have a .25 hp, 750:1, TEFC integral gearmotor that I want to drive very slowly by removing the fan and coupling to the stub shaft. It would be driven about 6 rpm with another very small integral gearmotor through a small clutch. A basic creep drive.
The actual required horsepower at high...
A customer has a small high cycle indexing conveyor with a 1.3 second cycle. Almost all the braking with be done with decel but they are thinking of using DC injection braking to insure the motor comes to a complete stop. This is a 1/50th hp, 3 ph motor on a 300:1 high efficiency gearbox...
A customer has a 10 hp, 480 V, 3 ph, Baldor Motor # CWDM3714T driving a mixer through a 100:1 helical gearbox. The motor is being driven by a WEG VFD in the volts/hertz mode, (not vector) at 25 Hz. The following reading were taken by a old clamp on amp/volt meter, Simpson I think, which does...
A customer has an 1/8 hp, 115 vac PSC motor that is reversing rotation at stall. The stall only happens when something goes wrong but the effect of motor running in reverse is costly.
I have read that increasing the capacitor size will help this problem but increase the starting current. Does...
A customer has a 20 hp, 100 foot (30 m) bucket conveyor on a 45 degree incline. For mechanical reasons the conveyor chain will often surge or jerk. The speed of the conveyor is around 40 fpm (12 m/min) and the surges can be from 1hz to .25hz. The surge is most pronounced and causes the most...
I have a 480V, 3 phase, 3.5kw/4.7hp, 3458 rpm, 6.5 FLA motor which is drawing 3.8 amps. What would the torque be given nominal and balanced voltage? This does not have to be exact. If you can give me a range it would really help.
Thanks in advance!!
Barry1961
A customer has a lift that is loading/unloading racks of parts. The rack has 50 shelves which are unloaded in 12 minutes. An example single unload cycle will consist of, starting from out feed, high speed up, low speed up, off/brake 1 sec, low speed up 1 sec, off brake 2 sec(unload shelf), low...
A customer has a band saw blade cutting balsa wood that runs 1200 fpm. In the past they tried using rolling type blade guides which they did not like.
Now they are using a ceramic guide which guides the blade very well but generates sparks from the back portion of the guide. They do not...
I have an application with a 1/8hp(.09kw), 3 phase, 240V, 60hz motor on a 240:1 gearbox being controlled by a VFD with single phase 240V input. At times the motor is being used as a brake for a large mass. The VFD is rated for 1/4hp(.18kw) and has an internal braking resistor rated for 50%...
Due to a mix up a customer has several 1/10 hp, 230 volt, 3 phase, 60 Hz motors and 460 volt 1/4 hp VFD's. The motors are 50-60 feet away from the VFD's.
They have tried "reducing the voltage with the VFD" and have burned a couple of motors. I am getting this information second hand.
If...
A customer in the US wants to test machines he builds for overseas where they will be run on 220V, 1ph, 50hz. These are 1/2hp, 1ph, 220V, 50hz, cap start motors.
They are looking for a cheap 1ph, 50hz, 220V supply.
Can you use one phase off a VFD for this?
Any recommendations?
Barry1961
A customer has asked where to find an SKA valve controller. It is used on a large ball valve in a paper mill. The actuator is powered by a stepper motor and he thinks they are made in Sweden.
I have found a few SKA's but not valve controllers.
Ring any bells?
Barry1961
I have some partial information about two old DC drives that a customer would like to replace with AC. These drives are on a coil slitting line. They are slitting aluminum, 14ga max, 4 blades max. The slitter runs for a few hours each week. They would like to go to AC because of the...
I have some preliminary information about a ball mill that is having problems with the input of the drive gearbox failing every couple of years. The last time it failed the input pinion bearing housing had cracked. The assumption is that the motor is starting “hard” and inducing a moment into...
I am looking for a voltage doubler to replace a step up transformer to drive a VFD.
The specifications are 1/4hp, 230VAC, 3ph with a 115VAC, 60hz, 1ph supply voltage.
I would like to find something already packaged for panel mounting with MOV and over current protection. If I have to I can...
I have a customer with VFD driving a 50hp, 2 pole, 460v motor. The VFD is does not want to start the motor at all and is tripping on over current. He measured the motor winding from phase to phase and got .3, .3, .4 ohms and open to ground.
This sounds low to me but I would think there would...
I have a 1/20hp, 115VAC, 60hz, single phase, PCS, gear motor with a 200:1 ratio that I would like the stop time/position to be repeatable. I would rather not use a mechanical brake so was thinking of DC injection braking. There is not much money to be spent in this project so I was thinking of...
I have an application for a machine/conveyor that needs a large speed range. The customer would like a 16:1 range but can live with less. I have been able to do 10:1 ranges without feedback using 4 pole motors.
Would like:
Top speed, 35 in-sec with 1% speed variation allowed
Low speed, 2...
A customer has an application for a mixer that will run at 120 rpm for most of the time but needs to run at 480 rpm for 5 min once or twice a day. The high speed is a cleaning cycle.
The required torque will be around 100 in-lb for both the low and high speeds. At low speed it will be mixing...
I have a customer with a centrifugal spin casting operation that is having trouble with the seals on the water jacket wearing out every 3 or 4 months. The current seals are made of rubber. The customer is looking for ideas on something that might last longer than the rubber seals and is...
