What is constant torque motor?
Constant torque motors are high-efficiency, brushless DC motors that are based on the same ECM technology described in ECM 2.3 variable-speed motors. … In other words, if the ESP changes, then the motor program will maintain the amount of torque for which it was programmed (this is not the same as constant airflow).
Do AC motors have constant torque?
Constant torque load
An AC drive can operate a motor with a constant flux of from zero to the motor’s rated nameplate frequency (typically 60 Hz), which is the constant-torque range. As long as a constant V/Hz ratio is maintained, the motor will generate constant torque.
Do electric motors lose torque over time?
over time, motors will lose some of their torque as the magnets weaken from being subjected to heat.
Is a pump constant torque?
Pumping applications can be categorized as constant torque (CT) or variable torque (VT). This refers to the relationship of the torque required by the pump to a reduction in speed. … Conversely, when you slow down a centrifugal pump, the performance (pressure and flow) capability is reduced.
How do you maintain constant torque?
In order to keep a constant torque, which is directly related to current, the voltage going from the VFD to the motor is increased as the speed increases. On a 460 Volt motor, 460 Volts is only applied to the motor when the speed reaches 60 Hz.
Why do electric motors have constant torque?
The torque of the motor is proportional to the product of the armature current, the main pole flux(field) and a machine constant which is a function of the armature windings. This means that if the shunt field excitation is kept constant, the torque is dependent solely upon the armature current.
What is the meaning of constant torque?
With constant torque loads, the torque loading is not a function of speed. … As the speed changes, the load 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 causes an electric motor to lose torque?
The most common cause of motor failure, and arguably the most difficult to overcome, is low resistance. Low resistance is caused by the degradation of the insulation of the windings due to conditions such as overheating, corrosion, or physical damage.
Can an electric motor lose horsepower?
Yes. Brushless, electric motors do lose power over time.