Added almost 10 years ago | 00:01:29 | 80763 views
A toroid with three different wire windings is connected to 220 VAC 3-phase voltage. The voltage phase of each of the three windings lags 120 degrees behind the next, creating a changing induced magnetic field. The changing field causes...
Added almost 9 years ago | 00:07:38 | 55781 views
Two or more air carts are connected by springs on an air track. When this system is at resonant frequency, symmetrical patterns called normal modes appear. The normal modes are shown in both undriven and driven cases. In the undriven ...
Added over 8 years ago | 00:01:26 | 47532 views
A long beaded chain is looped over a motor pulley. When the motor is turned on, a disturbance in the chain causes waves to propagate through it. When the motor is brought up to full speed and the chain is knocked off the pulley it will...
Added almost 10 years ago | 00:01:07 | 42528 views
A mass on a spring is driven by a large geared motor apparatus, and exhibits resonance at the appropriate frequency. Below resonance, the driving motion is in phase with the motion of the mass. At resonance the mass is 90 degrees out of...
Added over 9 years ago | 00:01:18 | 39495 views
A wooden ball is attached to the rim of a spinning wheel. The ball is held in place by a string. When the spring is cut, the ball flies in a straight tangent to the wheel.In the camera's frame of reference, the ball constantly acceler...
Added over 8 years ago | 00:04:03 | 31534 views
Fast-forward to 1:50 to see it spinning! This is test #1 of the B.W.D. Scooter's first custom-built motor. The scooter is this year's Edgerton Center Summer Engineering Workshop project. B.W.D. stands for either "both wheel drive" or "b...
Added over 8 years ago | 00:02:29 | 30079 views
The B.W.D. Scooter is an electric kick scooter with Both Wheels Driven by custom-built brushless DC hub motors. For more information, visit: http://web.mit.edu/first/scooter The hub motors built into each wheel are 3-phase, 14-pole...
Added over 7 years ago | 00:04:33 | 29834 views
A row of candles are placed inside a see-through dome on a rotating platform. When the platform rotates, air inside the dome gets swung to the outer part of the dome, creating higher density air at the outer rim, and lower density air i...
Added over 8 years ago | 00:03:05 | 27286 views
The B.W.D. Scooter is an electric kick scooter with Both Wheels Driven by custom-built brushless DC hub motors. For more information, visit: http://web.mit.edu/first/scooter The hub motors built into each wheel are 3-phase, 14-pole bru...
Added over 8 years ago | 00:00:22 | 25956 views
This is a speed test of the B.W.D. scooter's first custom-built hub motor. The scooter is this year's Edgerton Center Summer Engineering Workshop project. B.W.D. stands for either "both wheel drive" or "brushless wheel drive," since the ...
Added over 8 years ago | 00:01:10 | 24884 views
This video shows a significant difference between square-wave commutated and sine-wave commutated brushless motor drive. The motor (from the B.W.D. Scooter project, can resonate with the scooter frame at certain speeds when driven with o...
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