# Tag Info

Accepted

### How does gear reduction affect a stepper motor's holding torque?

Yes, the holding torque goes up proportionally with the gear ratio. Plus the friction of the gear train, and any other seals, bearings along the gear train that add friction.
• 56
Accepted

### Stepper motor speed control problem

Although the advertised advantage of a stepper is that it can be driven "open loop" (no position or velocity feedback required for accuracy, instead you just keep count of the steps) this is only true ...
• 15.1k
Accepted

### How do I calculate the ideal travel distance of the ball screw per revolution of the stepper or per step for the following hardware?

Screw: M6 M6 coarse has a 1 mm pitch. M6 fine has a 0.75 mm pitch. Unless otherwise stated assume coarse, so 1 mm pitch. Your motor is 1.8° per step. This is 360/1.8 = 200 steps/rev. The screw will ...
• 10.9k
Accepted

### What does the Torque vs Frequency plot mean for a stepper motor

RPM of a stepper motor Formula for calculating stepping motor speed. $$RPM = \dfrac{a}{360} \cdot f_z \cdot 60$$ $RPM$ = Revolutions per minute. $a$ = step angle $f_z$ = pulse frequency in hertz
• 367
Accepted

### How to vary the force output of a motor while stalled?

There is nothing inherently wrong with running a motor in stall. The difficulty is that the power dissipation may be higher than the motor can handle long term. Every motor can dissipate some amount ...
• 11.4k
Accepted

### Why servomotor has such low torque compared with stepper motors?

Operating principle is different. In essence if you buy just a motor it will be just that. You can now add gearing that will reduce speed and increase torque. Since torque is directly proportional to ...
• 3,577
Accepted

### How much weight can my stepper motor rotate?

The limit on the stepper motor is the torque it can produce. This has nothing to do with the weight it is rotating, except that the weight may cause more friction, which the motor has to overcome. ...
• 11.4k
Accepted

### Optimising driving speed of stepper motor for maximum acceleration by trial and error

One way might be to try to model and understand the physical problem. You are however clear in your question that you would prefer an empirical approach where constants are tuned to experience data. ...
• 386
Accepted

### Stepper motor holding torque without coils energized?

The value Detent Torque or Cogging Torque is what you should look for in the specification sheet. The detent torque is related to stepper motor power loss. The following is a reference from Minebea' ...
• 7,135
Accepted

### How to constrain stepper motor inside case?

Constrain the driven shaft and use a coupling to the motor.
• 15.9k
Accepted

### How much power does a stepper motor draw when holding weight?

Depends on how much weight and the motor. Some stepper motors have detent torque. This is the torque they will hold without consuming any power. They also have a holding torque for which you need ...
• 6,106
Accepted

### How do I mechanically convert 200 steps into 360 discreet degrees?

You want a transmission with a ratio R such that $R \cdot 200 / 360$ gives an integer number of steps per degree. Then in controlling software you can program it to take e.g. 5 steps to move one ...
• 1,953

### controllable low RPM motor

You want something called a gearmotor, which is a modestly-sized DC motor that can run in either direction at a variety of speeds, depending on the voltage you feed it. You select the appropriate gear ...
• 15.1k
Accepted

### Mechanically increase motor torque

Actually if you want to keep accuracy and increase the torque you can use a gearbox that reduces the input Rpm. So you will be Sacrificing the speed for the increased torque and precision. Its also ...
• 24.4k

### Geared stepper motor engage/disengage mechanism

I would probably go for a belt tensioner. figure : Belt tensioner (source tecscience) i.e.: at some point in the assembly install a belt between two pulleys and use a motor to engage the tensioner. ...
• 24.4k
Accepted

### Will this pulley modification result in more torque on my stepper motor

Yes. you're right. Your stepper motor will produce 3 times more torque, 3 times more resolution. And 3 times slower angular speed on the lead screw.
• 22.6k
1 vote

### Calculating the torque required to move and hold an arm parallel to the floor

When the arm is straight out it has a torque $T= mg*L \quad$with L the distance between arm's CG and rotation center. Your stepper motor should provide this torque to keep the arm in balance. if ...
• 22.6k
1 vote
Accepted

### Calculating the torque required to move and hold an arm parallel to the floor

To paraphrase https://www.controleng.com/articles/stepper-motor-torque-basics/, holding torque is the amount of torque required to turn a stationary rotor. As long as this is higher than the torque ...
• 2,347
1 vote

### Could stepper motor lose torque because of overheating?

There are a number of possibilities: the higher the temperature -> the higher the internal coil resistance -> the lower the current flowing through those coils -> the lower the torque. That's one. ...
• 2,692
1 vote

### Master/Slave Gear Mechanism for Navball

I’ve been working on and off on making a working navball since 2013 and have gotten the mechanics working. Here’s the secret to getting it to work. For rotating electrical connections you use ...
• 11
1 vote

### Selection Of coupling and determining size of motor to rotate heavy disc

There are a lot of questions here, and not really enough information to answer them... Will my disc deflect? Yes. How far it will deflect and whether or not that is a problem depends on the force ...
• 7,761
1 vote

### Calculate output pressure of a syringe pump

The question asks how to derive output pressure from step-rate. The answer does not perform all the calculations but attempts to define the variables. Minimum required specs: s = Step incr. [m] (...
1 vote

### Mini freewheel / overrunning clutch for stepper motor

You may be able to locate the desired component if you search for "one way bearing for rc helicopter." I also used the term "sprag clutch" but came back with industrial grade, industrial sized items, ...
• 7,287
1 vote

### Determining required torque for a chain and sprocket conveyor belt

F is an external force which is simply any forces outside of your conveyor setup that may need to be accounted for. For example, if your load was very tall you may need to consider wind resistance. ...
1 vote

### How much could this motor lift and how fast?

The height has nothing to do with the selection of the motor. Whichever motor type you choose (servo or step motors will allow you control the exact position while simple induction motor just cannot) ...
1 vote
Accepted

### Stepper motor skipping steps

I assume the bottom stepper shaft is affixed directly to the clear plastic platform that supports the top motor and the breadboard, is this correct? If so, there are two possible causes of your ...
• 15.1k
1 vote

### How to mount timing pulleys/belts for small DIY project

I tried both ways, idlers and slide, with and without additional spring. A) Idler with spring tends to oscillate when load torque is not constant (it is rarely constant). B) Sliding motor and spring ...
1 vote

### Determining required motor torque

It is the same as everywhere else. You do not need to calculate torque based on the design of the reducer/motor. you need to figure out the ratio that specific gear vs motor will spin at. Once you do ...
• 126

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