For Sale EM score motors X 2

[AlanJ]

2 Williams EM score motors, complete with motors. See pics as two different motor specs. The numbers on the motor gear housing are the key.

£50 posted uk

 

[DAD]

For anyone not familiar but considering these : the 7883 is a USA spec 60hz motor, which will work in a UK game, but will run 20% slower than the correct 7884 motor

The 1960 is not a spec I recognise or can find on the Web, but the Rpm looks too slow for a score motor. It appears to have been fitted to replace the 7884 which was originally in the game (as per the printed label)

I'd suggest consulting the parts manual for your game (available online at Planetary Pinball)

ps I cleared with Alan that I would make these comments here

 

[Moonraker]

@MajesticPinball of any use...?

 

[Spandangler]

Interesting. So David. The Bally Amigo which I’ve bought and is imported from the states. Will that have the same issue?
Not knowing the theory of operation of a score motor, does this have an adverse affect on the game? Or is it fine? Just means the score reels click over a bit slower???

 

[DAD]

I've come across many games running on 60hz motors and they seem to cope OK, it's just a bit irritating having them count slower! 50hz games reimported to the US go the opposite way and count 20% too fast, which can cause badly tuned games to struggle to keep up.

I first came across this a few years ago when I took my Jack in the Box to a show and it burnt the motor out. I was kindly given a replacement motor but when I fitted it the game seemed to play sluggishly. When I inspected the motor it turned out to be a 60hz one, so I swapped it out for a 50hz one and the game was back to its old snappy self

Your game may also have a 60hz transformer, possibly with an extra step down transformer to convert our 240v supply to 110v

The only issue I've read about is that the frequency difference does put extra strain on the components and can cause overheating and degradation, and may lead to premature failure, but How likely this is on the pinball components I can't tell you.

When I buy a game that has a 60hz. motor and transformer in it I usually swap them out for 50hz equivalents if I have them available, but if I couldn't find any I'd carry on using the game as is.

We could really do with a parts exchange programme with the US

A quick Google just now threw up this link http://www.50hz60hz.com/60hz-motor-running-on-50hz-power-supply.html

 

[DAD]

AI Overview

+4

Operating a 60 Hz transformer on a 50 Hz power supply is generally possible, but with potential issues. The core may saturate, leading to overheating and reduced efficiency. To mitigate these issues, the applied voltage needs to be reduced proportionally, for example, to 83% of the transformer's nominal voltage, according to Schneider Electric.

Here's a more detailed explanation:

Challenges:

• Core Saturation:
  The lower frequency (50 Hz) increases the magnetic flux density in the transformer's core, potentially causing it to saturate. Saturation leads to increased core losses, overheating, and reduced efficiency.
  
  
• Overheating:
  Increased core losses can cause the transformer to overheat, potentially leading to equipment failure.
  
  
• Voltage Reduction:
  To avoid core saturation, the input voltage must be reduced proportionally to the frequency change (50/60 = 0.833).
  
  
• Capacity Derating:
  The transformer's capacity (kVA) will also need to be derated by the same ratio (e.g., 83% of its original rating) when operated at 50 Hz.
  

Mitigation Strategies:

• Reduce Input Voltage: Lowering the input voltage proportionally to the frequency change (50/60 = 0.833) helps prevent core saturation.
  
  
• Derate Capacity: Reduce the load on the transformer to match its derated capacity.
  
  
• Consider a Frequency Converter: For demanding applications, using a frequency converter to provide a 60 Hz power supply can be a better option.
  

In essence, operating a 60 Hz transformer on 50 Hz is feasible, but it's crucial to reduce the input voltage and derate the transformer's capacity to avoid potential problems like core saturation and overheating.

 

[Spandangler]

Thanks David…. Guess ideally I’ll be looking out for a 50hz transformer and motor.

It is possible to rewire the transformer for 240v so I assume it’s the same transformer anyway for export just wired differently?

 

[DAD]

I'm not sure about Ballys

Gottlieb, and I think Williams, US transformers had 110 v input only , export transformers had both 220-240v and 110v inputs

 

[MajesticPinball]

@MajesticPinball of any use...?

Thanks for the @ no these won't fit into the housing unfortunately