Permanent Magnet DC Motor (Brushed)
A Brief Description To Help You Understand Permanent Magnet DC Motors (Brushed) As Used In Various Electric Car Conversions
Permanent Magnet DC Motor - Pulled Apart Showing Major Parts such as stator (made of permanent magnets), 2 of the 4 brushes and Armature (Rotor). This Electric Motor was used on ElectricCarConversionBlog.com 's Electric Go Kart in 2011
What is a Permanent Magnet DC Motor (Brushed)?
A Permanent Magnet DC Motor (the brushed types) are DC Electric Motors that use permanent magnets to create the static magnetic field and have a wound armature.
What are common features of Permanent Magnet DC Motors (Brushed)?
The common features of a Permanent Magnet DC Motor (Brushed) are:
- They have brushes which perform the commutation (mechanical commutation), unlike brushless DC motors or other brushless motors where the commutation is done by complex electronics;
- Use permanent magnets which are stationary to provide a magnetic field instead of electro magnets;
- Simple to power up – just connect up a battery (of appropriate voltage and capacity) to the terminals and it starts running;
- Simple in construction – just some magnets and armature/rotor windings.
What are some examples of Electric Cars and Electric Vehicles using Permanent Magnet DC Motors (Brushed)?
Some examples of the Permanent Magnet DC Motors (Brushed) are
- OSCar eO Electric SUV that is competing in the 2012 Dakar Rally with it’s Permanent Magnet DC Motor, which puts out 150KW of continuous power, 235 KW or peak power, 400Nm of continuous torque and 800Nm of peak torque.
- the modified Electric starter motor used on ElectricCarConversionBlog.com ‘s Electric Go Kart during 2011;
- an Electric Car Conversion done on a 1993 Ford Fiesta which uses Lynch Permanent Magnet DC Motors;
- an Electric Car Conversion done on a 1973 Fiat 500R which uses an Agni Permanent Magnet DC Motor;
- an Electric Car Conversion done on a 1993 Fiat Marea station wagon which used a Lynch LM200 Permanent Magnet DC Motor.
- Voltron – a TTXGP Racing Electric Motorcycle which uses 2 Agni Permanent Magnet DC Motor.
What are the advantages of Permanent Magnet DC Motors (Brushed) when used in an Electric Car Conversion?
Some of the advantages of Permanent Magnet DC Motors (Brushed) are
- Simple construction;
- Motor Controllers or Speed Controller are fairly easy to built or obtain and usually cheaper than with other types of Electric Motors;
- Can easily obtain Motor Controllers that permit Regenerative Braking;
- Relatively cheap to buy.
What are the disadvantages of Permanent Magnet DC Motors (Brushed) when used in an Electric Car Conversion?
Some of the disadvantages of Permanent Magnet DC Motors (Brushed) are:
- It’s not easy to obtain a powerful motor big enough to power larger Electric Cars. Electric Car Conversions that use Permanent Magnet DC Motors are typically micro cars such as the Fiat 500, Fiat 126 etc.
- These require regular maintenance such as replacement of brushes which are a wear item. The commutator may also require replacement as they are a wear item as well.
- The torque produced is often not as high as that produced from a Series Wound DC Motor.
- Sparks and arcing can happen from the brushes.
- Interference to TVs, radios etc can result due to RF noise from the brushes.
Check out Motors For Electric Cars Family Tree for more Electric Car Motor information.
