Archive | Electric Motors

How to Select Electric Motors? | Electrical Engineering

The electric motors of various designs are available to meet the needs of various classes of industry. So the selection of electric motor itself has become an important and tedious process. The conditions under which an electric motor has to operate and the type of load it has to handle, determine its selection. The various factors that are to be [...]

By |2018-02-20T16:27:38+05:30February 20, 2018|Electric Motors|Comments Off on How to Select Electric Motors? | Electrical Engineering

Operation of Electric Motors | Devices | Electrical Engineering

In this article we will discuss about the single and four quadrant operation of electric motors. Single Quadrant Operation of Electric Motors: Single quadrant operation means that load and the motor shall be required to run only in one specified direction under the action of developed torque. When an electric motor is switched to electric supply mains and drives mechanical [...]

By |2018-02-20T16:27:38+05:30February 20, 2018|Electric Motors|Comments Off on Operation of Electric Motors | Devices | Electrical Engineering

Characteristics of Electric Motors | Electrical Engineering

For selection of reliable and efficient motor it is essential that the conditions of service are well known. It is not sufficient to simply specify the output power in kW and the speed but it is also necessary to know the following additional particulars: (i) Torque at the shaft during running, starting and at different loads. (ii) Accelerating torque and [...]

By |2018-02-20T16:27:38+05:30February 20, 2018|Electric Motors|Comments Off on Characteristics of Electric Motors | Electrical Engineering

DC Series Motors: Characteristics and Performance | Electrical Engineering

In this article we will discuss about the characteristics and performance curves of a dc series motor. Characteristics of a DC Series Motors: 1. Speed-Current Characteristic: In case of a dc series motor, the mmf due to the exciting coils increases in direct proportion to the line or armature current, so (neglecting arma­ture reaction effects) the value of flux varies [...]

By |2018-02-20T16:27:36+05:30February 20, 2018|Electric Motors|Comments Off on DC Series Motors: Characteristics and Performance | Electrical Engineering

DC Shunt Motors: Characteristics & Performance | Electrical Engineering

In this article we will discuss about the characteristics and performance curves of dc shunt motors. Characteristics of a DC Shunt Motor: 1. Speed-Armature Current Characteristic: If applied voltage V is kept constant, the field current will remain constant, hence flux will have maximum value on no load but will slightly decrease due to armature reaction as the load increases [...]

By |2018-02-20T16:27:36+05:30February 20, 2018|Electric Motors|Comments Off on DC Shunt Motors: Characteristics & Performance | Electrical Engineering

List of Three-Phase AC Motors | Electrical Engineering

Here is a list of three-phase ac motors: 1. Three-Phase Induction Motors 2. Three-Phase Synchronous Motors 3. Synchronous Induction Motors 4. Variable Speed Commutator Type 3-Phase Induction Motor 5. Compensated Induction Motor 6. Three-Phase AC Series Commutator Motor 7. Three-Phase AC Shunt Commutator Motor. 1. Three-Phase Induction Motors: 3-phase induction motors have gained extremely wide application in industry by virtue [...]

By |2018-02-20T16:27:36+05:30February 20, 2018|Electric Motors|Comments Off on List of Three-Phase AC Motors | Electrical Engineering

List of Single-Phase AC Motors | Electrical Engineering

Single-phase motors are more widely used than 3-phase motors because of two following basic reasons: First for reasons of economy, most houses, offices and also rural areas are supplied with single-phase ac and the second factor is the economics of the motor and its branch circuit. Fixed loads requiring not more than 0.5 kW can generally be served most economically [...]

By |2018-02-20T16:27:36+05:30February 20, 2018|Electric Motors|Comments Off on List of Single-Phase AC Motors | Electrical Engineering

Types of Split-Phase Motors: 5 Types | Electrical Engineering

The following points highlight the five main types of split-phase motors. The types are: 1. Resistance-Start Single-Phase Induction Motor 2. Capacitor-Start Single-Phase Induction Motor 3. Capacitor-Start Capacitor-Run Single-Phase Induction Motor 4. Permanent Capacitor Single Phase Induction Motor 5. Shaded-Pole Motor. Type # 1. Resistance-Start Single-Phase Induction Motor: It is a form of split-phase motor having a high resistance connected in [...]

By |2018-02-20T16:27:36+05:30February 20, 2018|Electric Motors|Comments Off on Types of Split-Phase Motors: 5 Types | Electrical Engineering

How to Protect Electric Motors ? | Electrical Engineering

Protective devices must be incorporated in the control circuit (or circuits) to interrupt the flow of current to the motor to guard against overloads or other conditions dangerous to the motor or the driven machine, and also to guard against faulty or careless operation of the equipment itself. The most frequent causes of abnormal operation of electric motors are overloads, [...]

By |2018-02-20T16:27:35+05:30February 20, 2018|Electric Motors|Comments Off on How to Protect Electric Motors ? | Electrical Engineering

List of Repulsion Motors | Electrical Engineering

List of repulsion motors: 1. Compensated Repulsion Motor 2. Repulsion-Start Induction Motor 3. Repulsion-Induction Motor. 1. Compensated Repulsion Motor: It is provided with an additional winding, called the compensating winding, to improve power factor and provide better speed regulation. This winding is much smaller than the stator winding and is usually wound in the inner slots of each main pole [...]

By |2018-02-20T16:27:35+05:30February 20, 2018|Electric Motors|Comments Off on List of Repulsion Motors | Electrical Engineering
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