How to measure the speed of a motor without using a speed sensor?
Hi there everyone and merry xmas to all…
In certain treadmills, the speed by which the user is running is measured and calculated using a mounted sensor near the rotor of the motor. However I found that some treadmills lack this sensor, and I am seriously wondering how this could be achieved? I know that the more the motor is rotating, the more current it consumes, but I hope to know the formula relating electrical quantity(ies) to the rotation per minute (rpm).
Thanks in advance…
If the treadmill has a DC motor, the speed controller’s output voltage sets the motor speed. If the treadmill has an AC motor, the speed controller’s output frequency sets the motor speed. Both types of speed controllers can control the speed reasonably well without feedback.
PS1
The speed indication display is based on the controller voltage or frequency if the speed is not measured to provide feedback.
PS2
Motor current is an indication of the torque that a motor is producing. If the voltage applied to a DC motor or the frequency and voltage applied to an AC motor are held constant, the speed generally decreases from the no-load value as the motor is loaded. That provides a way of determining the speed more accurately than just assuming that a certain applied voltage or frequency results in a given speed. The details of analyzing motor performance vary a lot depending on the motor type and design.
Vehicle Speed Sensor Location
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REAR ABS Speed Sensor MERCEDES C220 C230 C280 C36 AMG $9,599.00 |
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FRONT ABS Speed Sensor MERCEDES C220 C230 C280 C36 AMG $9,599.00 |
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Bebionic V2 Prosthetic Hand Otto Bock Ossur C-Leg C Leg Sensor Speed $4,250.00 |
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HD 720P WDR Hitachi Sensor 18x Zoom High Speed Outdoor PTZ IP Dome Camera $2,389.99 |
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Keyence Ultra High-Speed/High-Accuracy CMOS Laser Displacement Sensor $2,400.00 |
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Raymarine C120 Multifunction Nav, DSM 300 Digital Module, ST69 Speed/Temp sensor $1,700.00 |
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Met-One 010C Wind Speed Sensor USED (10pcs) $1,450.00 |
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BORG WARNER T5 S10 TRANSMISSION 2WD WITH MECHANICAL SPEED SENSOR FROM A 1986 S10 $895.00 |
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SMP/STANDARD SC420 Transmission Speed Sensor $936.92 |
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POLAR S625X (Speed sensor + cadence sensor) 4 pcs Lot $899.95 |
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OEM Mazda 3 or Speed3 18″ Alloy Wheel Package with Sensors & Stems Used $800.00 |
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SMP/STANDARD SC420 Transmission Speed Sensor $914.08 |
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Standard Motor Products SC420 Speed Sensor $871.41 |
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MyChron eBox “Extreme” Expansion Box w/ Data Key and Speed Sensor Kart Racing $799.95 |
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ORIGINAL Mercedes ESP Turn Rate Speed Sensor 0005426518 $783.00 |
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Mercedes S500 S600 Rotational Speed Sensor 0265005200 * $745.00 |
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New Passenger or Driver Rear Standard Speed Sensor RH LH Right Left Side Hand $719.49 |
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Ducati 1198S 1198 DTC Traction Control Brain ECU Front Speed Sensor Rotor Kit $719.25 |
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Standard Motor Products SC420 Speed Sensor $710.62 |
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93 94 Eagle Talon Vehicle Speed Sensor $690.95 |
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96 97 Volvo 850 Manual Transmission Front Wheel Drive With Out Speed SENSOR $500.00 |
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ABS Rear Wheel Speed Sensor Wabco STC1750 $659.08 |
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New Passenger Rear Standard Speed Sensor RH Right Side Hand Diamante 2004 Parts $653.38 |
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ORIGINAL F-16 ANTI-SKID WHEEL SPEED SENSOR FOR F-16 FIGHTER FALCOM AIRCRAFT LOOK $639.99 |
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Range Rover 3.9 4.2 V8 Rear ABS Wheel Speed Sensor NEW $624.77 |
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AE9Z9E731C Ford Sensor Assy – Speed $613.40 |
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AE9Z9E731C Sensor Assy Speed 10 MKS $613.40 |
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AE9Z9E731C Sensor Assy Speed 10 MKT $613.40 |
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AE9Z9E731C Sensor Assy Speed 10 Taurus $613.40 |
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Standard Motor Products SC419 Speed Sensor $617.67 |
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New Driver Rear Standard Speed Sensor LH Left Side Hand Mitsubishi Diamante Car $617.63 |
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ELECTRO-SENSOR LRB-1000 SPEED SWITCH 1-1000RPM 115VAC $599.00 |
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ELECTRO-SENSOR LRB2000 SPEED SWITCH WITH SOCKET 6IL2 $599.00 |
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Standard Motor Products ALS523 ABS Wheel Speed Sensor $571.90 |
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New Front Passenger Standard Speed Sensor RH Right Side Hand Isuzu Trooper Car $567.95 |
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New Driver Front Standard Speed Sensor LH Left Side Hand Isuzu Trooper 2002 Car $566.89 |
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Keyence EX-V01 High Speed Inductive Displacement Sensor $549.99 |
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BMW e46 (99-02) e36.7 Yaw Rotational Speed Sensor (DSC) $546.90 |
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BMW E46 Dinamic Stability Control Yaw Sensor Rotational Speed Sensor Brand New $545.95 |
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BMW e46 (01-06) e85 Yaw Rotational Speed Sensor (DSC) $544.90 |
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MyChron eBox Gold Expansion Box w/ Data Key and Speed Sensor Kart Racing Data $529.95 |
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FRONT ABS Speed Sensor LAND ROVER RANGE ROVER $517.99 |
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FRONT ABS Speed Sensor LAND ROVER RANGE ROVER $517.99 |
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FRONT ABS Speed Sensor LAND ROVER RANGE ROVER $517.99 |
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FRONT ABS Speed Sensor LAND ROVER RANGE ROVER $517.99 |
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New Front Driver Standard Speed Sensor LH Left Side Hand Ram Truck 1500 96 Car $521.29 |
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2011 Jeep Chrysler Dodge Adaptive Cruise Control Module Speed sensor OEM $500.00 |
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Standard Motor Products ALS913 ABS Wheel Speed Sensor $513.95 |
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John Deere Wheel Speed Sensor AA54557 $499.99 |
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SMP/STANDARD SC441 Transmission Speed Sensor $502.56 |
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Standard Motor Products SC419 Speed Sensor $504.70 |
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ABS Rear Wheel Speed Sensor Wabco STC1866 $502.03 |
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Sports Sensors Swing Speed Radar For Golf and Baseball + Includes Exclusive Golf $499.89 |
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SMP/STANDARD SC441 Transmission Speed Sensor $494.95 |
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Dodge Ram Diesel 98-04 Throttle Position Sensor 5 SPEED $483.77 |
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New Passenger or Driver Rear Standard Speed Sensor RH LH Right Left Pickup Truck $481.25 |
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Garrett Turbocharger turbo Speed Sensor Kit +Gauge speed sensor wiring harness $449.99 |
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Raymarine ST40 Wind System Rotavecta speed/dir sensor $476.10 |
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Standard Motor Products SC441 Speed Sensor $471.58 |
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Mercedes w140 (92-95) ABS wheel speed Sensor LT Front left lh driver $457.90 |
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