Questions tagged [motor-controller]

Any circuit for driving a motor that's more complex than wiring it to a power source through a simple on/off switch. Examples include speed and torque control using H-bridges, brushless motor controllers, stepper controllers, VFDs. Constant speed examples include relay control, reversing, reduced-voltage starting, overload protection and other control requirements more complex than a simple 0n/off switch.

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1answer
28 views

Shaded pole speed control with PWM

I have a fan with a shaded pole motor and I installed this PWM for speed control. At the moment everything is working well, speed adjustment is sensitive and the fan is barely moving at about the 60% ...
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1answer
74 views

4 Phase 5 Pin high speed motor driving (turbomolecular pump driver)

I just recently purchased a broken Turbomolecular pump from eBay and repaired it, now that it works again I need to build a low-cost driver for it. It has 4 Phases and normally relies on hall ...
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1answer
37 views

Motor for large speed range

I am designing a chuck for which I need a motor which can go from 200rpm to 5000rpm. I tried a 1000KV BLDC with 12V supply, but the minimum rpm was around 1800. Also, I am not sure whether stepper ...
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2answers
69 views

DC Series motor and its starting

I studied electromagnetics and with that understanding when I recall the Working of DC Series motor I stumbled upon an inherent negative feedback action in the DC series motor during starting as ...
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1answer
30 views

Field Flux control and Speed Of DC motor

I was studying electromagnetism and I tried to link with working of DC motors. For the speed control of DC motor - The Flux of DC motor is reduced to increase the speed above rated speed. I ...
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0answers
30 views

FOC electrical angle offset calculation with absolute encoder

I'm currently developing a motor controller with FOC (Field Oriented Control) and I have some trouble with the offset calibration of a motor. What I actually do to calculate the offset: I inject a ...
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1answer
32 views

Triac circuit resistor tied to motor

I've run across a triac circuit which has a huge 510 ohm 50W load resistor tied to a 115V 1.6A PSC fan motor. I'm not quite sure what that big resistor is for. Ideas? simulate this circuit – ...
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1answer
43 views

Suggestions on wiring PCA9685 i2c + TB67H303 motor ic

I'm trying to design a circuit in order to use the TB67H303 motor driver with the ATMEGA328p and the i2c protocol by using the PCA9685 controller. I never used the TB67H303 and the PCA9685 chips ...
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3answers
57 views

3hp motor contactor size 22A or 40A?

So my place has 2 contactor sizes of 22A and 40A. Now i know that both will be more than enough to power up a 3HP motor. To avoid oversizing in this case, would i need to provide additional fusing to ...
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2answers
77 views

Can I Move a wheelchair with two outrunner motors? [closed]

I am trying to turn a wheelchair electric and want to use a VESC to do so. However, I was wondering if an outrunner brushless motor with a belt to a larger gear would be effective and could move the ...
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1answer
66 views

Small project with a motor [closed]

So this project is very main function is controlling the motor spin direction and the speed witch is 0 to 5v, the all project works at 5v and i need a efficient way to controll the speed of the motor ...
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1answer
42 views

Do H-bridge configurations have any advantages over single MOSFET dc motor speed controller designs?

I’m designing a simple dc motor speed controller that only needs to be driven in one direction and I’m wondering if an H-bridge configuration would have any advantages over a single or dual MOSFET ...
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2answers
25 views

TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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2answers
51 views

Trapezoidal vs sinusoidal BLDC motor, back EMF speed caclulation

First of all do these motors differ electrically and if yes, how? Can you measure BLDC generator speed using back-emf independent of its waveform type?
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23 views

Why Dspic304011 Controller's PWM stucks to 50% duty cycle when DC link Voltage is turned onn before the gate votlage turned onn in SPWM inverter.?

I have implemented SPWM inverter that take input from grid (230V AC) and convert this to DC link voltage 320V and this DC link voltage is converter to desire frequency. The gate driver IR2136 is used ...
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20 views

How to Implement this BEMF Observer

I'm using the lecture by Dave Wilson at TI to implement a BEMF observer. I have the motor winding currents for phase A, B and C. I also have the Bus Voltage I also am in the stationary reference ...
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2answers
85 views

Big capacitor near input power connector

I observed that every brushless motor controller has a big capacitor in the design. (1000uF to 3300uF). How is this value choosen and what happens if I eliminate the capacitor in my design ?
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1answer
44 views

SPI with differential line drivers, and star configuration problem

Folks I am helping to design a circuit for a group that uses the odrive motor driver board. The odrive drives two brushless motors and the MCU uses SPI to connect to motor encoders. People using the ...
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1answer
35 views

BLDC ESC Reverse Direction with MOSFETS

I have a basic hobby ESC connected to a motor, and the ESC inherently is unidirectional (without firmware changes, which I am trying to avoid). Is it possible to wire up 4 MOSFETS to two of the phases ...
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2answers
41 views

Controlling speed of PSC induction motor (Questions about operating at high slip)

Induction motors typically run synchronous speed since most motor types (CS/CSCR/Permanent Split Phase) have high low-end torques. A PSC motor on the other hand doesn't have much low-end torque. FAN ...
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1answer
32 views

AC servo ASDA-B2 modbus position control

I have a very specific question on ASDA-B2 servo driver and I hope there is someone who has hands on experience with it who can help me out. I have referred to this user manual and it is not very ...
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0answers
27 views

Simple braking chopper using Zener/TVS diode

So I'm designing a motor controller, relatively low power (100-150W, 12-48V supply), and I'm thinking about adding a braking chopper. Not strictly needed in this design, but it would be a nice value-...
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4answers
40 views

Phase control universal motor dimmer

I need to control the speed of a 220v universal motor using arduino and I am thinking to use an atteny85 ic with a phase control circuit (ltv814 to detect zero crosses and moc3052 to drive a triac to ...
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2answers
46 views

Is there an economical 2-3 RPM 120v motor with speed control? Or what components could I use to achieve that scenario? [closed]

I've got a mechanical design for a piece of catering equipment and I need to figure out a way to achieve some variable speed control for a slow RPM motor. This is a direct drive application (imagine ...
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2answers
50 views

Can I use a 555 PWM signal to control

I want to use a 555 PWM signal to control a motor. I also want represented the speed of the motor with an LED graph using a LM3914 led driver. Can I use a digital signal to control the LM3914 ...
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3answers
141 views

How to make a conveyor (electric part)

I am going to make a conveyor like this There will be a optic sensor which detects a box. There will be motor (3 phase, 380 V, 1 A, 0.37 kW, 1400 rpm) with gear reduction (coefficient of reduction ...
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67 views

Unstable speed with A4964 BLDC controller

I am using an Allegro A4964 for controlling a BLDC micromotor. I have tuned the PID and all available parameters according to the documents available from Allegro. Problem: In the control modes I ...
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2answers
56 views

SVPWM: Does setting modulation index to 0 still consumes power?

I've implemeneted a 3rd harmonic injection SVPWM (Space Vector PWM) scheme and it performs quite well. One peculiarity i have noticed was, when i set the modulation index to 0, the motor stops as ...
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0answers
28 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
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0answers
83 views

TMC2130 with Arduino UNO

I have the Bigtreetech tmc2130 and trying to get it running with an arduino UNO. I have tried using the driver in my 3d printer and it works in SPI mode. I have tested the stepper motor driver with ...
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2answers
96 views

Bulk Capacitor for Motor Driver

I'm creating a motor driver for a BLDC motor. I was wondering how we can calculate or choose what capacitance we need for our purposes. We're using the motor driver for a chain drive /transmission ...
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1answer
48 views

What is the function of series inductors on the motor phases of a commercial brushless EC/BLDC motor controller?

While designing my own BLDC controller I got curious about how the big boys do it and opened up a commercially available one (Maxpos 50/5). Most things were quite straightforward, except a 11.3uH ...
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1answer
32 views

What maximum voltage will I need my ESC to be rated at?

I'm using a pair of drone motors in order to power a small vehicle. I have a 56V lawnmower battery, to which I will connect the two 22V motors in series. I need to be able to control the speed of the ...
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2answers
84 views

Brake Resistor in Regenerative Case for Elevator

I am trying to understand the switching pattern of Inverter and the Brake chopper while a 3-phase AC motor is in regenerative mode for example in Elevator case: When its Cabin is full and it is ...
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1answer
87 views

will a 48V DC motor work with a 36V Battery and controller

I have 1000W / 48V ebike motor. I have a 36V battery and 1000 W controller from another ebike. Could I use the 36V battery and controller with the 48V motor?
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3answers
205 views

bldc motor, esc and battery draw, nominal vs peak

I want to better understand how Electronic Speed Controllers (ESC) work for BLDC motors. Specifically, I am trying to understand battery current draw. Question 1: When an ESC is rated at 200 amps ...
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0answers
74 views

DC permanent magnetic motor control issues

We have a 180 V dc permanent magnet motor. When engaging the control board while the motor is hooked up. The output to motor drops out and reads no voltage. If I take the motor leads off the ...
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1answer
83 views

Is it possible to drive a low voltage (7V) brushed DC motor with a low duty cycle, 220V DC source?

I am trying to drive brushed DC motor rated at 7 volts in only one direction. The motor can sink high currents under load (I expect up to 20A). My genius plan is to run it from rectified mains ...
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1answer
44 views

Intelligent IGBT Module for Motor drive [closed]

I am looking for IGBT module for motor drive.. Approx. 50A, 1200V rating. 7 Pack module, Including Inverter + Brake circuit + Built-in drivers For this I have found a module and it's datasheet ...
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0answers
25 views

DQ transform on AC voltage source

I have a simple AC circuit made in Simulink where a dq transform is applied to a AC voltage source which is connected to a RLC load. I understand that dq transforms are used to convert synchronous ...
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1answer
71 views

Dynamic voltage divider

I'm trying to build an ESC (electronic speed controller) for three phase brushless motor. I found some intresting circuits but I am trying to build something very easy to do, with mosfet and pc817 and ...
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1answer
41 views

Motor Speed Output Signal [closed]

I need an advice. I just got a DC motor and its controller board. On the controller board it has 6 pin/wire: +12V, GND, PWM, ENABLE, DIRECTION, SPEED OUT. What I want to know is how do I interpret ...
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1answer
24 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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3answers
95 views

Speed limiter - 24v Motors

I'm looking for a way to limit the speed of some wheelchair motors in order to gain better control when using them in my RC device. Currently the motors are very sharp and don't ramp up to speed, ...
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1answer
60 views

Pre charge resistor switch

I have a 12V 40A motor. I have a switch between the motor controller and the battery. I want to put a pre charge resistor in the path. Like in the figure. My questions are: 1) The pre charge ...
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1answer
74 views

SAMD controlling BLDC resets during high current spike; EMI problem?

I have been making a brushless DC motor controller that is controlled through an ATSAMD21E16L and a MIC4609 mosfet driver. At low average currents of 2A or so, I drive the motor just fine, but when I ...
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2answers
85 views

Mosfet Driver - High Side Output Problem

I've been trying to make a 3 phase inverter to drive a BLDC motor. Mosfets : IRF3205 Driver : IR2101 Supply voltage for FETs and drivers : 12V BLDC : https://media.digikey.com/pdf/Data%20Sheets/...
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3answers
68 views

How to make sense of speed vs Torque curves in speed control mode

I am operating my motor in closed loop speed control mode using motor controller. Toque vs speed curves gives us a relation between them which is one-one correspondence. But in a closed loop speed ...
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1answer
50 views

Will it harm a PWM fan controller to be backfed full fan voltage?

I want to install a PWM controller to a small 12 volt furnace fan in a camper. I want the fan to run slowly after furnace shutdown, to quietly stir the air for more even heating. My thought is to ...
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2answers
113 views

Motor is consuming less than rated current and more than rated power

I have a brushless DC motor of following specs. I am using a roboteq controller to operated the motor. While running the motor i have collected the few params and here are the plots. power curve - ...