26 votes
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Understanding required torque for a motor lifting a weight

You have the right concept, but slipped a decimal point. 5 cm = 0.05 m. The gravitational force on your 450 g mass is 4.4 N as you say, so the torque just to keep up with gravity is (4.4 N)(0.05 m) =...
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  • 11.2k
11 votes
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What is this kind of X-Y motorized system?

This would definitely fit under any of the following names: XY Table 2D Positioner XY Stage XY Positioner
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8 votes

What is this kind of X-Y motorized system?

Well that part's manufacturer calls it a "Precision XY Motorized Linear Stage". The terminology is not hard and fast, though. I've also heard those called "XY tables". I personally recommend that ...
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4 votes
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Power and motor current

In the text you quoted, I was talking about mechanical power out of the motor. This is what the power rating of a motor, given no other qualifications, means. A "15 W motor" therefore can put out 15 ...
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  • 11.2k
4 votes
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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.
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  • 56
4 votes
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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 ...
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4 votes
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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 ...
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  • 8,229
3 votes
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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 ...
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  • 11.2k
3 votes
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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 ...
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  • 3,395
3 votes
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High RPM - Stepper vs Brushless Motor

Direct answers to question: Whether a motor could overrun depends on motor power, momentum of the load, and resistance of the system. This could be a problem even with switches, but can be overcome ...
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  • 3,971
3 votes
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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. ...
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3 votes
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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
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  • 402
2 votes
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How much stronger than the bare minimum should a motor be?

Without more details about your design, the dynamics of your mechanism, or your calculations, its virtually impossible to address your question with any certainty. However, i offer some advice that ...
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  • 2,559
2 votes

How to calculate the steps needed for a motor to rotate a circular object in a pulley configuration?

You provided a lot of redundant information which is moot to the answer. Whether the pulleys drive the ring through contact, the belt, how the belt goes etc is all moot to the answer. The only thing ...
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  • 6,123
2 votes

How to calculate the steps needed for a motor to rotate a circular object in a pulley configuration?

Assuming a perfect transmission, the amount the pulley needs to turn for a full revolution of the large ring is governed by the "gear ratio": $\theta_{ring} = 2 \pi * 1074 / 100 = 67.48$ rad or 10.74 ...
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  • 1,806
2 votes

System identification on a system with constraints

"Design of experiments" could help you achieve the minimum number of tests to come up with a mathematical model (transfer functions) of your setup. You can try two methods: First is the BLACK BOX ...
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2 votes
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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. ...
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2 votes
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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 ...
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2 votes
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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 ...
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  • 1,835
2 votes
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How to constrain stepper motor inside case?

Constrain the driven shaft and use a coupling to the motor.
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  • 13.9k
2 votes

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 ...
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2 votes
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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 ...
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2 votes

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. ...
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2 votes
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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.
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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 ...
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1 vote

What thread could this camera motor be?

There are some "exotic" thread sizes used for small instrument work. Note that for a specific diameter there can be more than one pitch. It is also possible that the thread is not metric. Metric fine ...
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1 vote

precision positional control needed for shifting position of lenses

An easy solution is to use a Motorized Linear Slide Pot - they're not expensive and they have a motor and a pot - you still need to build the feedback loop to control the position and use a DAC to ...
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  • 401
1 vote
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Stepper on high-RPM shaft

Couple the stepper motor to the high speed spindle motor only indirectly by means of magnets rotating around the spindle motor shaft which, at low speeds, will align themselves with specially designed ...
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1 vote

Stepper on high-RPM shaft

A one way clutch bearing on the stepper motor might give you the clutching action you want without much added mechanical complexity (note that this would require some experimentation). The high rpm ...
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