The torque constant, Kt, of a motor is a very useful parameter for sizing and controlling motors showing a linear speed / torque relationship. … Without getting into theoretical detail, Kt is simply the slope of the torque / current curve of a motor. The units of the constant are found in torque units per amp.
What is the no load speed of the motor?
From the motor data sheet, it can be seen that the no-load speed of the motor at 9 volts is 11,700 rpm. If the torque load is not coupled to the motor shaft, the motor would run at this speed.
How do you find the speed of a DC motor?
So for example if the motor spins at 10,000 rpm on 24 V then with 40% PWM applied it should run at 10,000*0.4 = 4,000 rpm. With 20% PWM it should run at 10,000*0.2 = 2,000 rpm. This is equivalent to running the motor on 9.6 V or 4.8 V.
Are DC motors constant torque?
DC motors can develop a constant torque over a wide speed range. For a DC motor : Torque is proportional to armature current – this means controlling torque requires simply controlling the motor DC current – easily achieved with a simple DC drive.
What is the unit of torque in dc motor?
Motor torque constant The SI units for the torque constant are newton metres per ampere (N·m/A). Since 1 N·m = 1 J, and 1 A = 1 C/s, then 1 N·m/A = 1 J·s/C = 1 V·s (same units as back EMF constant).
How do you calculate torque constant?
The units are Nm/sqrt(watt). The Torque Constant defines the torque-current relationship of a motor and is in Nm/amp. The motor and torque constants are related by the formula Km = Kt(trap)/sqrt(R), where R is the phase-to-phase resistance of the winding.
What is KV of motor?
Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor. If Kv is like horsepower, then Turns is the physical attribute of a motor.