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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...

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...

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?

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...

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?

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?

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...

Dear all, I am looking for light weight mechanism which will connect to the gearbox output. This mechanism will be free to rotate when backdrive torque was applied to the gearbox output without transmitting this movement to the gearbox and the motor. However, it will transmit the movement when...

Is it possible that the forward (drive) ballscrew efficiency is equal to backdriven efficiency?

Dear all, I would like to know what is the best simulation software to simulate Motor/generator with its electronic circuits and mehanical loads?

Dear All, Is the reduction gearbox efficiency is the same in both forward and backdriven directions? If No, is there a relation to calculate a backdriven effecifiency from forward efficiency?

Dear all, I would like to know if ball screw is a backdrivable mechanism, and how could I calculate the required force for backdriving?

Dear All, I am looking for tutorial to develop a walking robot in level ground. I would like to use ADAMS to simulate the system. However, I don't know how to make a relation between biped foot and the ground n order to walk.

Dear All, I want to ask if it is possible to use electric motor as a motor and generator in the same time according to the attached photo. On other word, When driving torque is required, the motor will work as an actuator. And, when the braking torque is required in braking mode, the motor will...

Dear All, I am looking for a lightweight backdrivable reduction mechanism with 1:100 reduction ratio. Is there any option to for lightweight and backdrivable reduction mechanism? regards,