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.

Do motors have constant torque?

Constant Torque Loads



As the speed changes, torque remains constant and the horsepower changes linearly with speed. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque applications.

What is constant torque and constant power of DC motor?

Type 1 – CONSTANT TORQUE LOADS



Constant torque loads require the same amount of torque at low speeds as at high speeds. Torque remains constant throughout the speed range, and the horsepower increases and decreases in direct proportion to the speed.

How do you find the torque constant of a DC motor?

To calculate the Torque Constant read the current draw at a given torque on the Typical Performance Characteristics graph. Now divide the torque by the current. To calculate the Motor Voltage Constant read the no-load speed (rpm) and convert it to radians per second.

How is torque controlled in a DC motor?

The command is then converted to control armature current through a Field Programmable Gate Array (FPGA) to the DC motor. The armature current level is maintained through a programmed Proportional Integral (PI) Controller to keep output torque constant regardless of armature voltage and rotor speed.

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Why do electric motors have constant torque?

Since the motor torque is proportional to current, the motor torque is constant (at its maximum) for that portion of the acceleration event. But after base speed is reached and exceeded, the motor torque reduces. And if you lift the throttle and accelerate at less than maximum, torque will be less.

Which is proportional to the torque in DC motor?

For DC Machine, torque is directly proportional to armature current and flux. In dc shunt motors, flux is constant (not dependent on armature current). Hence torque is proportional to armature current.

Is torque proportional to speed?

Torque is inversely proportional to speed. Thus, when speed increases, torque will decrease.

What is constant torque speed range?

For example, a constant-torque speed range (CTSR) is expressed as 10:1, or the motor can operate from base speed to 1/10 of base speed (180–1,800 RPM). Generally lower-horsepower general-purpose motors can operate over a wider speed range (20:1) because of their lower temperature rise.

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