Electric Bike Hub Motor—How to Replace a Hall-effect Sensor: Jeremy Nash explains what a Hall-effect sensor does in a brushless motor—and how to replace the sensor when it fails.VideosHow to make a magnet polarity detection circuit: Thomas Kim shows us how to make a magnet detector based...
What appears to be a good book on this subject is: The Magnetic Measurements Handbook, by J.M. Janicke Magnetic Research, Inc. Answers to the rod problems:Two rods It is fairly easy to determine which rod is a magnet and which is not. I suspect that if you actually had those two ...
He also presented the idea that electricity had positive and negative elements and that the flow was from positive to negative. Approximately 30 years later, a French scientist by the name of Charles Augustin de Coulomb conducted several experiments to determine the variables affecting an electrical ...
If you know the amps and volts involved, you can determine the amount of electricity consumed, which we typically measure inwatt-hoursorkilowatt-hours. Imagine that you plug a space heater into a wall outlet. You measure the amount of current flowing from the wall outlet to the heater, and...
Recognizing When to Recone Not all speaker issues necessitate reconing. Identifying symptoms like noise in speakers, distortion, or loss of power can help determine if reconing is the right solution. It’s also essential for those dealing with vintage or high-value speakers, where replacement speake...
About 1640 the French mathematicianMarin Mersenneconducted the first experiments to determine the speed of sound in air. Mersenne is also credited with discovering the second and third laws of strings. In 1660 the British scientistRobert Boyledemonstrated that the transmission of sound required a mediu...
He also presented the idea that electricity had positive and negative elements and that the flow was from positive to negative. Approximately 30 years later, a French scientist by the name of Charles Augustin de Coulomb conducted several experiments to determine the variables affecting an electrical ...
If you switch the ends of the wire to the opposite terminals on the battery, you'll reverse the polarity of your electromagnet — what was the north end of the magnet becomes the south end, and vice versa. If you assemble a second transmitter coil of wire and place it near the first,...
Two methods exist to determine the rotor position: sensor or sensorless. Sensor: Hall-effect sensors placed beside each stator winding - the small blue squares in Figure 2 - detect the changes in magnetic field polarity (N to S, S to N) as the rotor rotates. A three-phase motor requires...
He also presented the idea that electricity had positive and negative elements and that the flow was from positive to negative. Approximately 30 years later, a French scientist by the name of Charles Augustin de Coulomb conducted several experiments to determine the variables affecting an electrical ...