At each point selected for calculation, the efficiency of the motor is the mechanical power output divided by the electrical power input. Once again, a sample table for motor M2232U12G is shown in Table 1. and a sample curve in Graph 1. Maximum efficiency occurs at about 10% of the motor stall torque.

Nov 18, 2014 · Starting torque is the maximum torque that can be produced by a motor in order to start rotational movement of the load. Stall torque is the maximum torque that can be applied to the shaft and cause the motor to stop rotating. When there is no rotation in the motor,... Torque is the turning force through a radius - with the units Nm in the SI-system and the units lb ft in the imperial system.. The torque developed by an asynchronous induction motor varies when the motor accelerates from zero to maximum operating speed.

Stall current is the maximum current the motor will draw when the rotor is at zero rpm. Stall current is the same as Locked Rotor Amps (LRA), Max Amps, & starting Amps. Measuring a high power motor for stall current is difficult as there are pitfalls in some methods of testing.

Sep 21, 2008 · The peak torque is probably the starting torque for a brushless DC. So you can figure the gear ratio by the ratio of motor torque to wheel torque. For the 0 to 60km/h = 60,000/3600 m/s^2 = 10/6 m/s^2 and 200kg car that's 333.3 Newtons. 13cm diameter =.065 m radius gives you 21.67 N m wheel torque. Torque for Dc motors are linear. If you plot stall torque on y axis and free run rpm on x axis and draw a straight line between them you have the curve. Let's say 100mNm and 100 rpm for a 5 volt motor. If you have 2 motors and 100 mm wheels. And a force of 1 N is needed to keep it running How fast will it run?

I'm trying to calculate the stall current for a 12 V DC gear motor (919D1481): No load speed = 15800 RPM . No load current = 0.52 A . Nominal speed = 13360 RPM . Nominal current = 2.85 A . Nominal torque = 154.4 g·cm . Stall torque = 1000 g·cm $$$$

To get an accurate value, you'll have to measure it. Find someone who has a "bench dyno" and make friends with them :-) You can estimate if you know the efficiency of the motor. 2200 Watts is about 3 Horsepower, and torque is horsepower divided by rpm times 5252 (yes, that's an arbitrarily chosen constant everybody uses!)

May 03, 2017 · DC motors are pretty much linear, the faster they turn, the less torque they have. Max torque occurs at stall (as does maximum current) Drawing the torque-speed curve can be done by measuring the... Usually for small motors maximum power is at 50% of stall torque (approximately 50% of no load speed). Maximum efficiency may be 10-30% of motor stall torque (70-90% of no load speed). Continuous Stall Torque (T cs) – This is the amount of torque that can safely be produced over an indefinite period of time under a stalled rotor condition. This value is measured with the motor mounted on an aluminum plate (6” x 6” x 1.8”) heat sink, to the maximum allowable temperature of the windings.

Motor characteristics are frequently given as two points on this graph: The stall torque, , represents the point on the graph at which the torque is a maximum, but the shaft is not rotating. The no load speed, , is the maximum output speed of the motor (when no torque is applied to the output shaft). Given a constant v m, we can plot the speed of the motor as a function of the torque it produces (in steady state). The curve is just a straight line, as illustrated below. This equation allows us to calculate the stall (or starting) torque, by plugging in n = 0. This is the maximum torque the motor can generate. Usually for small motors maximum power is at 50% of stall torque (approximately 50% of no load speed). Maximum efficiency may be 10-30% of motor stall torque (70-90% of no load speed).

Stall torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero, i.e., to cause stalling. Electric motors, steam engines and hydrodynamic transmissions are all capable of developing torque when stalled.

Motor characteristics are frequently given as two points on this graph: The stall torque, , represents the point on the graph at which the torque is a maximum, but the shaft is not rotating. The no load speed, , is the maximum output speed of the motor (when no torque is applied to the output shaft).

Torque should be proportional to current, whether stalled or not. Measure the current at stall. Is it what you expected? It should be just the applied voltage divided by the DC resistance of the motor coils that are switched in. Also consider that there can be significant ripple on the torque over a rotation. The Drive Motor Sizing Tool is intended to give an idea of the type of drive motor required for your specific robot by taking known values and calculating values required when searching for a motor. DC motors are generally used for continuous rotation drive systems, though can be used for partial (angle to angle) rotation as well. The stall torque is nothing more than the available current times the torque constant (torque per amp). In the spreadsheet, the nominal voltage divided by the resistance equals the available current (I=V/R). If you have a different voltage, the stall current (and torque) will be different (if the resistance stays the same).

Torque should be proportional to current, whether stalled or not. Measure the current at stall. Is it what you expected? It should be just the applied voltage divided by the DC resistance of the motor coils that are switched in. Also consider that there can be significant ripple on the torque over a rotation. 1 lb ft = 1.355 Nm - torque converter; Electric Motor - Power vs. Torque and Speed. torque (Nm) speed (rpm) Electric Motor - Speed vs. Power and Torque. power (kW) torque (Nm) Example - Torque from an Electrical Motor. The torque delivered from an electrical motor producing 0.75 kW (750 W) at speed 2000 rpm can be calculated as. T = (750 W) 9.549 / (2000 rpm)