Unanswered Questions
516 questions with no upvoted or accepted answers
7
votes
1
answer
918
views
Modeling scalar control of PMSM
I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
CommunityBot
- 1
4
votes
0
answers
213
views
Slip-ring motor draws huge current on load but works normal on no-load
I have a slip ring motor. The rated current is 170 A (steady state) and it draws in excess of 250 A even on application of 25 % of rated mechanical load. The specifications of the motor are as under:
...
- 41
4
votes
0
answers
202
views
Using a 575 V to 220 V step-down transformer to power a 3 hp, 575 V motor with a 220 V VFD
I have a uniquely designed motor for a milling machine (expensive to replace and to purchase at a lower voltage).
What I want to do is purchase a 575 V primary, 220 V secondary 3p used transformer, ...
- 9,270
3
votes
0
answers
342
views
Motor speed controller generating noise on DC source
I am working with a speed controller for a 3-phase brushless DC motor.
That motor is taking a 6-12S li-ion battery as input. I have additional electronics that is connected to the same power source ...
- 61
3
votes
0
answers
125
views
What kind of monophasic induction motor is this?
About 15 Years ago I bought an induction motor from a junk yard. It have 6 leads being that 2 are the same lead, so 5.
The guy who sold me had no idea from what machine it came. And I don't quite ...
CommunityBot
- 1
3
votes
0
answers
565
views
BLDC bemf shape
I am trying to detect the zero crossing point of the BEMF voltage in order to control the motor sensorless.
The following picture shows the ideal shape of BEMF and in many application notes
or ...
- 879
3
votes
0
answers
82
views
Why do my outputs look exactly the same for the Allegro 3901?
I am trying to capture results shown in Figure 8 of Allegro 3901 data sheet .
My circuit looks like this:
The channels above coresspond to the oscilloscope screen captures below:
In the image ...
- 715
2
votes
0
answers
47
views
Why does my PMSM motor stop unexpectedly?
I have two PMSM motors, motor1 with 8 pole pairs and motor2 with 17 pole pairs
I use a gyroscope to measure speed;
I use PID controller1 and PID controller2 set two velocity for motor1 and motor2;
I ...
- 21
2
votes
0
answers
42
views
4am Shut down of hydro system that uses motor as a generator
My micro hydro system "motor as generator" stops generating on random days, but always at 4 am. It seems the resonance between the capacitors and generator winding is lost and the generator ...
- 41
2
votes
1
answer
75
views
Three-phase motor as generator: intermittent loss of field
I have a 7.5 hp, 3-phase motor I am using as a generator on a grid-tied micro hydro system.
The system works well most of the time and generates roughly 4400 W or about 100 kWh a day.
The connection ...
- 8,561
2
votes
2
answers
358
views
Motor controller design for Ryobi 40 V 16" Lawmower
I'm attempting to build a soft-start motor controller for a Ryobi 40 V, 16 inch electric mower (to replace a broken factory unit; unit is potted so I can't see/access the guts). Only details I have ...
CommunityBot
- 1
2
votes
2
answers
225
views
If I were to run a motor slower, would the battery drain less?
This might be a dumb question, but I'm using a 48 V, 18 Ah battery to run a 48 V, 1800 W brushless motor. I calculated a predicted 34.6 min runtime at full throttle, however, I need it to be able to ...
CommunityBot
- 1
2
votes
0
answers
118
views
Design of a DC motor controller
I want to design a control system to a DC motor using descrite component and not IC component. At the aim is to control the speed of that motor, but at the first time I want to design the inner ...
- 1,020
2
votes
0
answers
142
views
Simulation of motor drive IC in SIMetrix/Simplis
I want to simulate a DC motor driver like MIC4606-1 in SIMetrix/SIMPLIS software. The microchip provided only the SIMetrix model of MIC4606-1( Transient model:
https://www.microchip.com/en-us/software-...
- 1,020
2
votes
2
answers
81
views
Slowing cooker hood fan on lowest setting with resistive series load (or alternative)
My cooker hood has 3 settings, and the low setting is very powerful.
I want to make it less powerful to reduce the (high) noise but still provide some extraction.
I have dismantled the circuit to ...
- 15.2k