MV Synchronous Motor Starters - Eng-Tips

04, Aug. 2025

 

MV Synchronous Motor Starters - Eng-Tips

jraef

Electrical
Joined
May 29,
11,372
Location
US
Across-the-Line, RVAT, Reactor Start, Soft Starter?
With or Without a Motor Protection Relay?

Across-the-Line, no MPR, 1 high structure, figure $20k worst case scenario.
Add another $10k for an MPR with CTs, PTs, RTD inputs etc., like an SEL 710 of Multilin 869
Oh wait, forget that, I just saw the Synchronous...

Brushless or brush type? Excitation with the starter or is it external?


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
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RRaghunath

Electrical
Joined
Aug 19,
1,745
Location
IN
Synchronous motors and HP rating - must be low speed type.
If these are induction started (Induction-start, synchronous run) and source is good enough to allow DOL start, there is no difference between the starter for Squirrel cage induction motor and that for Synchronous motor. Upvote 0 Downvote

waross

Electrical
Joined
Jan 7,
28,898
Location
CA
Has the Polarized Field Frequency Relay gone the way of the dinosaur?

Bill
--------------------
"Why not the best?"
Jimmy Carter Upvote 0 Downvote

jraef

Electrical
Joined
May 29,
11,372
Location
US
The starter would not be different, but the appurtenances would be.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
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2esingeek

Electrical
Joined
Jan 6,
6
Location
US
I contacted a very helpful MV Technical Sales Engineer at Motortronics and said that a MV Brush Type Synchronous Motor at V HP at 514RPM with 38R Fuses and 125V Field Excitation voltage at 124A could be around 50,000. I am still trying to get prices from AB and Eaton. Upvote 0 Downvote

2esingeek

Electrical
Joined
Jan 6,
6
Location
US
Sorry SEL 710-5 and its Across the line Upvote 0 Downvote

Right Synchronous Reluctance Servo Motor For Optimal Performance

Synchronous reluctance servo motors are a type of electric motor that is commonly used in industrial automation and robotics applications. 

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These motors offer several advantages over other types of motors, including high torque density, high efficiency, and precise control. However, choosing the right synchronous reluctance servo motor for your application can be a challenging task. 

In this article, we will discuss some key factors to consider when selecting a synchronous reluctance servo motor.

One of the most important factors to consider when choosing a synchronous reluctance servo motor is the torque and speed requirements of your application. The motor must be able to deliver the required torque and speed to meet the demands of your application. It is also important to consider the duty cycle of the motor, as this can affect its performance and lifespan.

One of the most important factors to consider when choosing a synchronous reluctance servo motor is the torque and speed requirements of your application. The motor must be able to deliver the required torque and speed to meet the demands of your application. It is also important to consider the duty cycle of the motor, as this can affect its performance and lifespan.

The environment in which the motor will operate is also an important consideration. You should consider factors such as temperature, humidity, and vibration when choosing a synchronous reluctance servo motor. Motors that are designed for harsh environments may be required for some applications.

Finally, you should consider the cost and availability of the motor. Synchronous reluctance servo motors can be more expensive than other types of motors, so it is important to consider the overall cost of the motor over its lifespan. You should also consider the availability of the motor and any associated components, as this can affect maintenance and repair costs.

Motor efficiency is an important factor to consider when choosing a synchronous reluctance servo motor. Motors with higher efficiency can reduce energy consumption and operating costs over the life of the motor. Look for motors with high efficiency ratings, and consider the impact of motor efficiency on your overall system efficiency.

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Synchronous reluctance servo motors require precise control and feedback to operate effectively. Look for motors with built-in feedback devices such as encoders or resolvers, and consider the type of control system that will be used to operate the motor. Closed-loop control systems can provide more precise control and better performance than open-loop systems.

The size and weight of the motor are important considerations, especially in applications where space is limited. Look for motors that are compact and lightweight, without sacrificing performance. Consider the overall system weight and size when choosing a motor, and look for motors that can be easily integrated into your system.

By considering these additional factors when choosing a synchronous reluctance servo motor, you can make a more informed decision and select a motor that will meet your needs and provide reliable performance over its lifespan.

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Our Synchronous motors and submersible pumps are extremely durable and don’t need frequent maintenance or repairs because they are created using cutting-edge technology. 

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