Dual Speed To Single Speed Motor

You can use the motor on either one of the dual speeds. This is usually done by connecting the desired number of poles (or windings) in reference to the speed you want.

Thank you. D

During rewinding, the important parameter among other things to consider are the number and capacity of the slots. With the number of slots per pole and phase, U can designed or redesign a used motor for any speed U want. Since the frequency is constant, the only option we are left with is to vary the number of poles. By varying the number of poles, we obtain deferent levels of speeds.

The issue of using any speed windings in the event failure, weather high or low speed is never obtainable. If any of the winding is burnt, the entire motor is affected and none of the speeds will work because it is a series/parallel or open star/close star winding connection for high or low speed respectively.

The only option for the motor to work is when the fault is within the selector switch.

DICKSON.

Thank u

Winding principles are better understood from drawings. High and low speed are not indipendent of each other as any burnt coil in the low speed will affect the high speed too.

Below is a tutorial drawing for ur perusal.

From the drawing, if any of the windings fails, it is a total failur and the motor will not function.

DICKSON

Many Dual Speed Motors are with PAM windings or Dahlander windings - which is a single winding. In such case you can use an one of the speeds continuously. But if the winding fails, motor has to be rewound. Contacy manufacturer for winding details.

A dynamoelectric machine in the form of an induction motor is provided which is capable of two speed operation with a minimum number of motor leads and a minimum number of motor windings. The motor includes a stator assembly and a rotor assembly, the stator assembly being adapted to receive the motor windings in a conventional manner. The motor windings are constructed from a plurality of coil sets, groups of which define physical poles for the motor. The windings include a first main winding, a second main winding and an auxiliary winding. The first main winding and the auxiliary winding have an equal number of physical motor poles. The second main winding has twice the number of physical motor poles as the first main winding. The first main winding and the auxiliary winding are energized to permit motor operation at a first speed. Second speed operation is obtained by energizing the second main winding, disconnecting the auxiliary winding, and reconnecting the first main winding so that it functions as an auxiliary winding for the second main winding. actually dual speed motor consist on the 2 separate sets of winding.so you can select any one .

Yes and no. You dont need to change anything, except if you want both the speeds to be the same ( So that you could use any winding). Just decide on the speed suitable for you and connect that winding to your control circuit. Unfortunately you'll never have a spare winding.(If one winding fails, normally the other one fails too. As they are wound together, on top of each other, they fail together.)

<...convert a dual speed motor to single speed motor...>

Conversion of the motor is not required. Simply operate the motor in one of the speed configurations only.

<...If one of the dual winding fails can the motor be run with single winding....>

The question is nonsense:

• If a dual speed motor is required for the process equipment that the motor is driving, then a single speed motor would be unacceptable.
• If a single speed motor is acceptable then a dual speed motor is not required.
• If a winding fails then it indicates a lack of attention to the motor overload protection devices and the potential for a fire at the facility, which would be unacceptable.