i have seen many electric car project all the cars are using pmsm motor . why
motors with permanent magnets, especially rare earth magnets need less electricity per horsepower because either the field or the rotor doesn't need electricity to make a magnetic field. you can use a series or shunt wound D.C. motor to power your vehicle. these are similar in construction to the motors traditionally used in golf carts, electric fork lifts, and diesel railroad traction motors. before the advent of inexpensive power semiconductors, electric motors were commutated by brushes made of copper and carbon riding on a part of the rotor, also called armature. to keep the armature rotating. presently many motor types use control circuitry to perform this commutation. i'd suggest you deconstruct an electric drill, or motorized toy vehicle to explore the topologies of various D.C. motor designs.
A permanent magnet synchronous motor would be subject to slippage when their maximum torque has been reached. The overload behaviour of AC induction motors are much more acceptable. You'll note that the DIY'ers advocating permanent magnet motors are never professional electrical engineers, there are reasons why. Synchronous motors are by definition AC, notably three phase AC, there are no DC synchronous motors unless you consider brushless which is really an AC motor with a builtin inverter. Go with AC motors, I did an undergrad paper back in the 80's on how AC motors would eventually supersede DC motors in LRT transportation, decades later, it did.
Most projects I've seen use series wound DC motors for the cost to performance ratio. The very best motors are AC induction. The reason you would choose an AC motor is because they can spin faster. In the case of a synchronous motor the permanent magnet is spinning so the relative motion between the b field and the e field is less than in a permanent magnet DC design, producing less back EMF. Spinning faster means you can use lower gearing for quicker acceleration. DC motors can be quick too because they have so much torque at low RPM, but they're inefficient at low speed and high torque, which is why most DC projects retain the transmission unless it's just for racing. AC motors can drive the car fast even in low gear, making the transmission extra and unnecessary. Just one speed is all you need, something that's like between first and second in a traditional drive train.
A rotor assembly for an electric powered motor incorporates a stress assembly, a cup that receives component to the stress assembly, and a magnet center assembly received between the stress assembly and the cup. The magnet center assembly is hermetically sealed between the stress assembly and the cup. A rotor assembly for an electric powered motor incorporates a stress assembly, a cup that receives component to the stress assembly, and a magnet center assembly received between the stress assembly and the cup. The magnet center assembly is hermetically sealed between the impeller and the cup.
