Search results for query: *

I would like to know which of the following motors (brush permanent magnet DC motor, brushless DC motor and linear motor) have less size and weight at the same power (high power/weight)?

Dear all, I would like to compare between Linear Dc motor, Brush permanent magnet DC motor and Brushless permanent magnet DC motor according to the following parameters: 1- Power/weight (power to weight ratio) or( the size at the same power) 2- efficiency 3- controllability 4- moving parts...

Linear drive nut is manually controlled via lever to switch between engage and disengage. Is there an electrical controlled one instead of the manual one?

I am looking for ballscrew which equipped with controllable linear clutch to control engaging/disengaging of the ballscrew's nut. Therefore, when this nut is disengaged, the nut can move freely under the external load without any effect on the ballscrew. And when the nut is engaged, the...

Acording to maxon driver, 1-Q driver works in both Q-1 and Q-3. Please, have a look on page 4 in this file: http://www.maxonmotor.nl/be/nl/downloads/mmc_2006_e.pdf I have another question regarding to 4-q driver. Could I use 4-Q drive to work as bidirectional amplifier to actuate the motor in...

@Keith What do you mean by " Normally I see the two quadrants as being only direction 'forward and reverse' not motor and generate"? @SottyUK What do you mean by "Braking would require a 2 quadrant drive, but not the two quadrants you get from a reversing type!"? I am a little bit confused. Is...

Many thanks Keith, I have another two question: 1- What about 1-Quadrant motor driver? 2- If I want to control the braking mode for the motor as well as the motor mode, what is the suitable motor driver "1-Q, 2-Q or 4-Q"?

What is the difference between 2-quadrant speed controller and 4-quadrant in brushless DC motor controller?

Dear all, I am looking for the mathematical model for DC brushless generator in laplace form. Could you tell me where could I find this model in any textbook?

If there were a frameless brush DC permanent magnet DC motor, why couldn't I find it. I am looking for frameless permanent magnet DC motor.The motor will work under the following conditions: - peak torque =around 1.5N.m - rated (continuous) torque = around 0.4N.m - maximum speed at no load= less...

Why is the hall sensor commonly used for commutation in brushless DC motor?

Dear all, I would like to know if "frameless DC motor" could be found for brush permanent magnet DC motor, brushless DC motor or both together. I am looking for frameless permanent magnet DC motor, but what I found was for frameless brushless DC motor. Is there a frameless brush DC permanent...

Dear all, First of all, I would like to know what are the difference between maximum motor speed and rated speed? Secondly, how can I calculated the rated speed if I know the speed trajectory for the load in order to choose proper motor? For example, to calculate the rated torque it will...

What do you mean by "You will not be able to control the ouput of the motor"?

Dear all, I would like to know if it is possible to use brushless DC motor as a generator.

Dear all, I want to design a lightweight device, and I was thinking to use frameless brushless dc motor in order to reduce the overall weight of the device. However, I don't know if it has drawbacks or not. What are the drawbacks of using frameless brushless dc motor?

I am looking for Bi-directional overrunning clutch becuase I don't want to backstop the backdrive action, but I want it overrun it.I mean that the clutch disengages automatically when the driven member rotates faster than the driving member in both CW and ACW with the following specifications...

Dear all, I am looking for easy and good book which explains biomechanics of human body during walking and stair climbing (specially for lower limb)in easy manner in order to be understandable for beginners in biomechanics. Could you suggest a book to me?

I mean that I can control when it will be either engaged or disengaged.

Dear all, I am looking for lightweight controllable clutch in both engaged and disengaged modes such as (electromagnetic clutch) which works under the following conditions: 1- Maximum speed=80rpm 2- Continous rated torque=60N.m 3- Maximum peak torque= 150N.m 4- maximum allowable weight is 0.5kg...