Table of Contents
What is split-phase motor?
A split-phase induction motor is a type of single-phase induction motor in which the stator is provided with a starting or auxiliary winding (S) and a main or running winding (M). The starting winding is displaced by 90° from the main winding as shown in the figure.
What are the types of split-phase motors?
1. Resistance-start, induction-run motors 2. Capacitor-start, induction-run motors 3.
What are the three basic types of split-phase motors?
Types of Split-Phase Motors: 5 Types | Electrical Engineering
- Type # 1. Resistance-Start Single-Phase Induction Motor:
- Type # 2. Capacitor-Start Single-Phase Induction Motor:
- Type # 3. Capacitor-Start Capacitor-Run Single-Phase Induction Motor:
- Type # 4. Permanent Capacitor Single Phase Induction Motor:
- Type # 5.
Why does a split-phase motor produce a starting torque?
At the same time the rotating field cuts the squirrel cage conductors of the rotor and induces a current in them. This current creates magnetic poles in the rotor, which interact with the poles of the stator rotating magnetic field to produce motor torque.
What does the term split-phase mean?
Definition of split phase (Entry 1 of 2) : the phase difference of two or more currents into which a single-phase alternating current has been divided.
What is the basic difference between a split-phase motor and a capacitor motor?
A split-phase motor has significantly lower torque at starting than any of the capacitor motors due to the reduced phase angle between main and auxiliary winding currents.
What are the advantages of using split-phase motor?
The advantages of a split phase induction motor include the following. The motor is economical & can be changed once it wears out before trying to reverse it. These are available in different frame sizes so that they can be placed effortlessly in most of the machines.
How do you test a split-phase motor?
To troubleshoot a split-phase motor, apply the following procedure:
- Turn power to motor OFF.
- Check to determine if the motor is controlled by a thermal switch.
- If the motor does not start, use a voltmeter, such as a Fluke 87V Industrial Multimeter, to check for voltage at the motor terminals.
What type of voltage is applied to a split-phase motor?
Many split-phase motors are designed for operation on 120 or 240 V. FGR. 19 shows the schematic diagram of a split-phase motor designed for dual-voltage operation. This particular motor contains two run windings and two start windings.
Does a split-phase motor have a capacitor?
A split-phase motor has no capacitance in the auxiliary circuit. A phase shift with respect to the main current is achieved by using narrow conductors to achieve a high resistance to reactance ratio.
What is the function of centrifugal switch in split-phase motor?
A centrifugal switch is an electric switch that operates using the centrifugal force created from a rotating shaft, most commonly that of an electric motor or gasoline engine. The switch is designed to activate or de-activate as a function of the rotational speed of the shaft.
How is split phase power measured?
Basically, you need to treat one wire out of the three as your reference, and measure the voltage to and the current in the other two wires. Then the total power is sum of the two individual powers.
Is split-phase 240v?
High-demand applications, such as air conditioners, are often powered using 240 V AC circuits – these are connected between the two 120 V AC lines. These 240 V loads are either hard-wired or use NEMA 10 or NEMA 14 outlets which are deliberately incompatible with the 120 V outlets.
Why capacitors are used in split-phase motors?
A capacitor connected in series with the starting winding creates a phase shift of approximately 80 degrees between the starting and running winding. This is substantially higher than the 45 degrees of a split-phase motor and results in a higher starting torque.
Does a split-phase motor use a capacitor?
What is a PSC motor mean?
Permanent Split Capacitor
A Permanent Split Capacitor (PSC) Motor is a type of single-phase AC motor; more specifically, a type of split-phase induction motor in which the capacitor is permanently connected (as opposed to only being connected when starting).
What is a CSR motor?
The capacitor-start—capacitor-run motor, or CSR motor produces a high starting torque and increases the running efficiency. It is actually a capacitor- start motor with a running capacitor added permanently to the starting winding. The starting winding is energized all the time the motor is running.
Why do we use split-phase?
A split-phase power system is one with multiple (in-phase) AC voltage sources connected in series, delivering power to loads at more than one voltage, with more than two wires. They are used primarily to achieve a balance between system efficiency (low conductor currents) and safety (low load voltages).
What is a split phase induction motor?
These motors are commonly known as split phase induction motors or Resistance split phase Motors. The stator of this type of motor carries two windings, one called the main winding (M) and the Other known as auxiliary winding (A) or starting winding.
What is the starting torque of a resistance split phase motor?
Once the motor is started, the auxiliary winding is disconnected with the help of a centrifugal switch (S) at about 75 to 80% of the synchronous speed. Fig. 2 shows the torque-speed characteristic of a resistance split-phase motor. The starting torque of this type of motor is generally 125 to 150 % of the full-load torque.
How do you reverse the direction of a split phase motor?
Split Phase Induction Motor. The direction of the Resistance Start motor can be reversed by reversing the line connection of either the main winding or the starting winding. The reversal of the motor is possible at the standstill condition only.
What is auxiliary winding in a split-phase induction motor?
In a split-phase induction motor, the additional winding is known as auxiliary winding or starting winding. The constructional features of split-phase induction motors are well explained below.