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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46 views

IS this the correct way to control the speed of a 4 wire CPU fan?

The circuit is used outside of a PC. simulate this circuit – Schematic created using CircuitLab The fan hums (but still spins) on the MED and LO settings. Does this mean the circuit is the ...
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23 views

Cycle-by-cycle current limiting with latching comparator

I am attempting to design a cycle-by-cycle current limiting circuit for a motor driver. Here is my circuit along with some notes to explain its intended operation: The latching comparator I plan on ...
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26 views

Circuit design - usage of BOOT0 and a Hall effect sensor on STM32G431CBT6

I am working on motor project with STM32G431xxx, with their stock B-431B-ESC1 Discovery board. I was able to generate code with the motor workbench and change and debug it on CUBEIDE. This week I ...
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58 views

How to limit Inrush current from a DC motor?

I'm new to this platform and knows very little about electronics. Please forgive if any of this is dumb. I wish to create an inrush current protection for my L298N Motor Driver, which drives a 7.5V DC ...
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19 views

Error while simulating the speed control of a brushed DC motor using a 555 timer and a high boost convertor using Multisim simulator

Reference paper: https://ieeexplore.ieee.org/document/6183251 I'm trying to simulate the speed control for a brushed DC motor using a 555 timer (astable multivibrator) and a high boost convertor using ...
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39 views

How to measure precision speed of bldc motor with encoder which has 1024 pulse per revolution

I am trying to control bldc with SVPWM based FOC method.I have a bldc motor with 1024 pulse encoder. I calculate speed in encoder pulse interrupt. But i can't directly calculate d(encoder pulse)/dt. ...
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30 views

Trouble with ESC & Brushless motor

I'm new in this group, I hope to be welcome and help you whenever i can. At first i need your help... i'm assembly a drone ( quadcopter ) , and testing the ESC with the motors, and i have issues. I ...
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53 views

Testing DC Motor with a Torque Wrench

How can I measure the torque of a stalled DC motor @ 6V using a torque wrench? I'm trying to test my DC motor with the torque wrench method (regular torque wrench used for cars). Any guidance helps. ...
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115 views

How to drive a high side MOSFET with an optocoupler correctly?

I am trying to create an absolutely minimal motor driver, to create a <5$ low power odrive. But since I am only a software developer, I do not have a 100% understanding of analog components, and ...
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40 views

Negative gate transients on high side half bridge FET

I am trying to simulate a half bridge for a 3 phase motor driver. When my high side FET transitions off, during the dead time, the switch node voltage is 25V. I would expect this voltage to be a ...
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32 views

Problem figuring star delta starter circuit

I know the basic functioning of star delta motor starter configuration but kind of stuck on my current project which uses old L&T starter panel. I can't figure out the terminals like A1, A2 (coil ...
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74 views

Getting problem in triac based fan speed control

I'm using this circuit to control the speed of ceiling fan. The fan speed is divided into 8 steps. (0:off & 8:full speed) with 100us gate pulse. This circuit works with incancescent light bulb ...
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35 views

Motor Control - Max Id and Iq values

When talking about closed-loop motor control, people usually refer to a rotational frame in DQ terms. In motor specifications(see image below) the value of current is more likely to be specified in ...
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27 views

Is there an industrial standard switching sequence for trapezoidal BLDC motor controller?

Currently I am working on a BLDC controller for 2kW hub BLDC motor of chinese origin. It does have 63 stator slots and 56 poles. I tried almost all standard BLDC switching sequences and some other ...
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42 views

DC motor interfering with another

I have two H-Bridge drivers controlling two geared DC motors. These are the modules I am using : https://www.handsontec.com/dataspecs/module/BTS7960%20Motor%20Driver.pdf I have two of the above ...
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159 views

Anything wrong with connecting L298Ns in parallel?

Although L298Ns are very inefficient, they're very cheap. I have two motors that require 4A+ current at load combined. Can I connect multiple L298Ns in parallel in this way to increase the overall ...
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36 views

How to calculate duty cycle of a servo motor?

I have this servo motor and in its specifications only speed and torque is given: ...
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41 views

voltage spikes in BLDC motor driver

I'm working on the BLDC motor driver. I have the voltage spikes on Vgs and Vds voltages. When I supply with 30V, spikes reach about 70-80V. I added the snubber circuit on mosfets but it doesn't work ...
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52 views

How is the feedback estimated in the torque mode control of a servo motor?

The torque mode control of a servo motor requires the feedback of the current torque generated by the motor in order to compare it against the torque reference signal. Is the product \$K_t I\$ of the ...
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38 views

Using a Ebike controller for a hobby BLDC

I am looking for a BLDC controller around 750W-1000W. I have yet to build the motor itself but am thinking it will fall within the operating range of 48-60v @ 10-15amps. When I look online I notice ...
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23 views

DRV8301 driver IC for BLDC motor

I'm trying to build a BLDC ESC using stm32f405 and DRV8301. I'm able to generate PWM signals from STM32f405 but unable to detect the same PWM signals on the outputs of the DRV8301.I'm using a bench ...
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44 views

Is the three phase voltage output from inverse Park / Clarke a “decimal voltage”? Or is it modulated by PWM

I'm trying to understand brushless dc motor control via field orientated control, I'm watching this video here : https://youtu.be/YPD1_rcXBIE?t=588 Here we have the "Inverse Clarke/Park" ...
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24 views

Why does BLDC shaft magnetic field collapse when commutation occurs

I'm watching this video to try to understand motor control, https://youtu.be/WYJWdMV3YMs?t=420 Here the video says that one of three phases would "collapse" in its field strength when ...
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72 views

Advice on electronic circuit design for an agricultural machine

I’m working on a project which is technically working well but I have some problems on the electronic circuit. This project is my first professional project after I graduate university so I have no ...
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53 views

How suitable are GaN half-bridges for small brushless motor drives (ESCs)?

The drone world uses ESCs (Electronic Speed Controllers) to control brushless DC motors. Typically there are six discrete FETs, a driver IC, and a small MCU to sequence things. Typical currents ...
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51 views

Capacitors for PWM Motor Control

I am planning a Rev2 of a previously successful motor driver PCB and I want to simplify it. Rev1 was a bit 'belt and braces'. It took 24V from a main board and passed that through an adjustable ...
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54 views

Reverse engineer VFD control signal from schematic

There's a TLDR at the bottom! I got a brushless DC motor and VFD from an old treadmill, both are Baldor brand. Unfortunately it looks like they were made by Baldor specifically for this treadmill, and ...
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45 views

Help in identifying the motor

I am total noob in electronics field. I had some broken electonics appliances lying around house so now I am trying to build something out of it. Can you guys please help me with identifying the motor ...
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74 views

STM32 F103 GPIO software toggling too slow for 20 microseconds state change?

I'm designing an ESC for my hobby project but I got stuck on current chopping. I want to toggle a pin every 20 us and want to use a timer interrupt for this. On the oscilloscope I can see that timer ...
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41 views

What is the difference between a hard switched vs soft switched architecture in power converters

I've seen many examples detailing ZVS/ZCS for boost/buck converters, but I haven't found any evidence that soft switching is a design goal for motor drivers. Why is it difficult to soft switch a motor ...
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30 views

Building a VFD for a split phase (capacitor run) motor?

I'd like to get variable speed on a very tiny lathe (Taig, 4" swing). I've got a dishwasher motor I'm planning on using for it, which is rated for 3600rpm at 60Hz (it's about 1/5HP). But it's a ...
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60 views

How to select appropriate capacitor for an H-bridge

PROBLEM: Considering the figure below, I need to select an appropriate bank of capacitors for a 3 half-bridge brushless controller, which system have this characteristics: VM = 60v (maximum); Max ...
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88 views

Connect motor control board's 4 terminals to brushed motor

Although I have a degree in engineering, it's mechanical engineering. In addition, I have been developing software since I graduated, so please excuse my obvious ignorance about electronics hardware. ...
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95 views

How does one calculate change in motor speed due to field weakening?

In field orientated control (FOC) of a BLDC motor, when applying an \$I_d\$ current, one can effectively change the 'speed constant' of the motor. I want to be able to calculate specifically how much ...
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71 views

Purpose of capacitors in MOSFET driver circuit

I'm designing a motor driver circuit which can only operate in one direction - thus is fairly simple: Bottom most line is sourcing 5V to VDD and the one above is the PWM drive signal. This looks way ...
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33 views

Can one use 5A transistor for motor driver of BLDC motor 920kv?

I am designing an esc for 920kv motors. For Code testing purposes on microcontroller, I want to make a low speed circuit but only have TIP122 (5A transistor) available in hand. Can they handle ESC ...
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2answers
44 views

Driving a 6v 250ma motor by using 12v 2A adapter

I am trying to use 4 motors(3-6V 250ma) controlled through 2 L293D Motor drivers. I have a 12V 2A adapter to supply VCC to the motor drivers. I am looking for a way to power my motors without damaging ...
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30 views

SPI communication with DRV8908-Q1 motor driver

I have designed a board to drive 4 BDC-motors using a DRV8908-Q1 motor driver (datasheet). Here is the schematic of chip with all connections and here is the microcontroller (Teensy4.0) The ...
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34 views

Microcontroller Interfacing with Stepper Motor - Current Consumption

I have this MPC5606S Microcontroller which I have interfaced with this Sonceboz Bi polar Stepper Motor. The Microcontroller is powered up by 5V and 3.3V and the Stepper motor interface is connected to ...
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70 views

Changing motor RPM

I bought a motor which has these characteristics: RPM: 2800 HP: 3 Voltage: 240V 50Hz AC For the application I will be using this motor, I need to keep the existing RPM of the motor (2800) and in some ...
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1answer
162 views

What is the value of this resistor?

I am trying to fix a rotary tool's AC powered DC motor controller, there is a resistor that has been burned out, I want to replace it for a new one, my question is how do I find the value of the ...
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1answer
41 views

HP C9017 Photosensor wire colors [closed]

I have at my disposal a photosensor (Optical encoder) with "C9017-80055", it has three cables: Black, Green, and yellow. I want to know the circuit (GND, VCC, output) to connect it with ...
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37 views

Powering 10V motor fader in Raspberry Pi 4 project

I am building a project that uses a motorized slide potentiometer with a Raspberry Pi 4, for the purpose of controlling multiple audio sources (such as system volume, VLC, OBS, and any other I can ...
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117 views

What is the purpose of this PCB?

I have a solar screen in my motor home that is motorized with a DC motor (24V.) Today, I tried to move it but no response. I removed all the solar screen and inspected the motor. I saw it has a PCB ...
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22 views

Multiple Trinamic TMC5130 drivers with stallguard2

I'm using two TMC5130 breakout boards with STM32F4 board. I control each with separate SPI channels, which works fine. I can get them to move, change settings, etc. StallGuard is used as sensorless ...
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52 views

How to achieve feedback in regenerative braking?

I’d like to implement regenerative braking in my own brushless ESC I’m designing. I’m stuck however on the part regarding voltage step-up. As I understand it, ESCs during braking usually use the motor ...
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99 views

How can I improve the design of my electronic speed controller?

We have a brushless motor with the following characteristics (Slow(8T)): For that motor, we are developing an electronic speed controller using the hall sensors. The microcontroller is an atmega328p ...
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16 views

Brake feature with phase/enable control for DC brush motors

I'm studying the datasheet of DRV8256E/P, and I need to select which kind of control to use: phase/enable or PWM. As far as I understand, the PH/EN mode is easier to handle because it requires only ...
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3answers
95 views

AC Synchronous motor control circuit

What is the best way to drive AC synchronous motor? I have AC motor like this: If I connect mains to 0 and 1 terminal it drives CW, if to 2 and 0 - CCW. In my project I have MCU that will drive motor,...
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3answers
54 views

DC motor doesn't start until PWM duty cycle exceeds threshold but continues to run when duty cycle reduced below threshold

I'm using a DC gear motor (from this kit, plastic gears) driven by a L298N module controlled by a STM32 BluePill. The motor voltage supplied to the L298N is 9V from a variable voltage AC adapter with ...

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