What is the relationship between speed and torque in synchronous motor?

Since the rated output power of a motor is a fixed value, speed and torque are inversely related. As output speed increases, the available output torque decreases proportionately. As the output torque increases, the output speed decreases proportionately.

Does voltage affect AC motor speed?

The speed of an AC motor is dependent on the number of poles it has and the line frequency of the power supply, not on it’s voltage. Common AC motor units are constructed with either two or four poles.

What determines the speed of synchronous motor?

The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles.

How is AC synchronous motor speed controlled?

Synchronous motors are constant speed motors. However, with the invention of solid-state devices, the frequency of the current fed to the synchronous motor can be varied. We can control the speed of the synchronous motor by changing the frequency of the supply to the motor.

What’s the relationship between speed and torque?

Torque is the rotational equivalence of linear force. Speed measures the distance covered in unit time. The relation between torque and speed are inversely proportional to each other.

Is torque proportional to speed?

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

What is the relation between voltage and speed?

The speed of a motor is directly proportional to the applied voltage up to the rated voltage.

How does current affect motor speed?

The speed of a motor is determined by the voltage and the torque by the current. If a motor is running at a certain speed with a constant torque and the load increases, the current will increase and so also the torque to maintain the same speed.

How does synchronous motor change speed?

We can achieve the speed control of synchronous motor either by changing the number of Stator poles or changing the frequency of AC supply. Varying the frequency is a feasible way for speed control of the synchronous motor. Using the rectifier and inverter combination, we can vary the frequency of AC supply.

How is torque related to voltage?

DC motors are relatively simple machines: when the load on the motor is constant, speed is proportional to supply voltage. And when supply voltage is constant, speed is inversely proportional to the load on the motor. Therefore, when supply voltage (V) is constant, torque (T) is inversely proportional to speed (ω).

Why are torque and speed inversely proportional?

This is because the torque is supplied by the current, while faster speeds increase the back emf which not only limits its final speed but blocks incoming current, therefore lowering torque. This is Why Torque and Speed are Inversely Proportional in an Electric Motor.

What is the difference between AC motor and synchronous motor?

Those AC motors whose rotor rotates on the synchronous speed of the rotating magnetic field are known as synchronous AC motors. The synchronous motors are the constant speed (equal to synchronous speed) motors at all loads provided that the load on the motor does not exceed the limiting value.

What is the relation between voltage and torque of a motor?

Voltage is proportional to speed, and torque is proportional to the current. The maximum current it could take is rated current and the corresponding torque can be found out from speed torque curve (as you know the speed from voltage (rpm=k*v)) where k is the speed constant of the motor).

What is synchronous motor torque-speed characteristic curve?

So let’s get started with Synchronous Motor Torque-Speed Characteristic Curve. Synchronous motor provides power to such loads that operate at constant speed and system.

What is flux amplitude and torque in an AC motor?

In an AC motor without a permanent magnet, the flux amplitude is set by the ratio of the applied voltage to the frequency. The torque is the product of the flux and the torque-producing current, i.e. the component of current which is in phase with the voltage.