Alnico Odometer and Speedometer Magnet by HSMAG New Product- A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. Speedometers for other vehicles have specific names and use other means of sensing speed. For a boat, this is a pit log. For an aircraft, this is an airspeed indicator.
Universal size: Alnico2 or 5,
23*d13.5*3mm without injection molding
2.3*d6*(3.5-4)mm with 3,4 or 6 molding holes
When the car or motorcycle is in motion, a speedometer gear assembly turns a speedometer cable, which then turns the speedometer mechanism itself. A small permanent magnet affixed to the speedometer cable interacts with a small aluminum cup (called a speedcup) attached to the shaft of the pointer on the analogue speedometer instrument. As the magnet rotates near the cup, the changing magnetic field produces eddy currents in the cup, which themselves produce another magnetic field. The effect is that the magnet exerts a torque on the cup, “dragging” it, and thus the speedometer pointer, in the direction of its rotation with no mechanical connection between them.
The pointer shaft is held toward zero by a fine torsion spring. The torque on the cup increases with the speed of rotation of the magnet. Thus an increase in the speed of the car will twist the cup and speedometer pointer against the spring. The cup and pointer will turn until the torque of the eddy currents on the cup is balanced by the opposing torque of the spring, and then stop. Given the torque on the cup is proportional to the car’s speed, and the spring’s deflection is proportional to the torque, the angle of the pointer is also proportional to the speed, so that equally spaced markers on the dial can be used for gaps in speed. At a given speed the pointer will remain motionless and pointing to the appropriate number on the speedometer’s dial.
The return spring is calibrated such that a given revolution speed of the cable corresponds to a specific speed indication on the speedometer. This calibration must take into account several factors, including ratios of the tailshaft gears that drive the flexible cable, the final drive ratio in the differential, and the diameter of the driven tires.
Alnico 3 Cast Bar Humbucker Magnet Polished, Alnico III Bar Permanent Magnet for Humbucker and P90 Guitar Pickups, Pickup Pickup Parts & Kits Alnico 3 Bar Magnets, Alnico Block HS-GPBA3 with polished Fueature: * Permanent Magnet Merial: AlNiCo 3 / Alnico III / A3 * Size: 2.5″ Length x 0.5″ Width x 0.125″ Height or 2.444″ Length x 0.492″ Width x […]
Alnico 2 Rough Cast Unplished Bar Magnet for Humbucker and P90 Guitar Pickups, Standard Rough Cast Alnico II Rectangular Bar Guitar Magnet, Alnico 2 Humbucker Magnet – Vintage Rough Cut Style HS-GPBA2 with vintage rough unpolished Fueature: * Permanent Magnet Merial: AlNiCo 2 / Alnico II / A2 * Size: 2.5″ Length x 0.5″ Width x 0.125″ Height […]
ALNICO 2 Polished Bar Magnet for Guitar Pickup, Alnico II Rectangular Bar Guitar Magnet, Pickup Humbucker Bar Magnet, Misc Hardware Alnico 2 Humbucker Bar Magnet Magnetized or N0n-magnetized HS-GPBA2 with polished Fueature: * Permanent Magnet Merial: AlNiCo 2 / Alnico II / A2 * Size: 2.5″ Length x 0.5″ Width x 0.125″ Height or 2.18″ Length x 0.5″ Width x 0.125″ Height or 2.444″ […]
Guitar Pickup Separate Magnets Alnico Rods, Alnico 2,3,5,8 Polepieces Vintage Staggered Set Rod Magnets for Pickup Bobbin, Alnico Separate Cylindrical Magnets, Pickup Separate Round Bar Magnets * Magnet Merial: Alnico 2,3,4,5,8 / Alnico I, II, III, IV, V, VIII/ A2, A3, A4, A5, A8 * Top Characteristic: Flat Top, Vintage Top, Modern Top(Chamfer) * Diameter: 0.187 in / 0.195 in / 0.250in * Length: 0.471 in 0.630 […]
ALNICO 8 Rod Pickup Separate Magnets Vintage Stagger Set, Rough / Sand Cast Alnico A8 Flush Pole Mounted Polepiece Magnets, Guitar Pickup Bobbin Alnico VIII Polepiece Rods Vintage Staggered Set * Magnet Merial: Alnico 8 / Alnico VIII / A8 / Al 8 * Top Characteristic: Flat Top, Vintage Top, Modern Top(Chamfer) * Diameter: 0.187 in / 0.195 in * Length: 0.471 […]
Rough / Sand Cast Alnico 2 Flush Pole Mounted Polepiece Magnets for Guitar Pickup Bobbin, Guitar Pickup Bobbin Rough Alnico II Polepiece Rods Vintage Staggered Set, Alnico 2 Pickup Rod Separate Magnets Based on the Vintage Stagger * Magnet Merial: Alnico 2 / Alnico II / A2 * Top Characteristic: Flat Top, Vintage Top, Modern Top(Chamfer) * Diameter: 0.187 in / 0.195 in […]