Electric Motors – What Are They?

electric motors

If you’re looking for an electric motor, you’ve probably been confused by all the different types that are available. BLDC motors, DC motors, SCR motors, and Induction types are a few of the more common varieties. Here are some more things you need to know about them. Let’s take a closer look. We’ll also discuss the pros and cons of each. This article will explain the differences between these motor types and their various uses.

BLDC motors

BLDC electric motors have two basic types. One type uses permanent magnets, while the other uses a synchronous motor. In BLDC electric motors, the rotor is made of permanent magnets with two to eight pole pairs. Ferrite magnets are relatively inexpensive, but rare earth magnets have high flux density and are preferred for their higher torque. Regardless of the type, BLDC motors need a way to track rotor position. This is accomplished by incorporating a rotor position sensor.

DC motors

DC motors are electric motors with conreyelectric a direct current (DC) source. They are designed to produce torque when energized by an external source. Normally, the motor consists of two main parts, a rotor and a stator. The rotor contains coil windings powered by DC current while the stator contains permanent magnets or electromagnetic windings. When the DC current passes through the rotor, it creates a magnetic field which attracts the magnets on the rotor. The rotor starts rotating due to this magnetic field. This happens when the commutator reversibly reverses the current flowing through the stator, and the motor starts rotating.

SCR motors

The energy derived from a current flowing through the SCR is stored as heat in damper windings. These windings are then used to fire the SCR. These motors are useful for hybrid applications, but they lack the high starting torque and consistent speed/torque characteristic of conventional ninety-volt electric motors. Moreover, they don’t match the standard ninety-volt 1,725-rpm industry gearmotors.

Induction motors

Split-phase induction motors are a good option for small-sized applications, especially where starting torque isn’t a major concern. They are self-starting, but have limited starting torque. The motor’s starting current is restricted to 4 to 7 times its rated value when the voltage is at its maximum. In addition, they don’t produce high torque in the initial stages, so they’re generally used in smaller devices.

Salient-pole motors

The basic function of salient-pole electric motors is to produce torque. This is accomplished through the induction of e.m.f. in the rotor. The reluctance component of torque is a component of salient-pole motors. To solve for these parameters, single-synchronous reactance must be divided into direct-axis (Xd) and quadrature (Xq) reactance.

Double-fed motors

When a machine is running at subsynchronous speeds, the power that is generated by the stator must be fed back to the rotor, a process known as supersynchronous operation. The frequency converter in a doubly-fed machine controls only 50% of the power that is produced. This is half the loss in a singly-fed machine. Thus, doubly-fed electric machines are an excellent choice for a range of industrial applications.