Help with DC motors.

[Dark Prognosis]

It has been a LOT of years since I built a motor and I never had much issue with what I am seeing on youtube.  Seems every DC motor I see they have to manually spin the thing before it starts but I do not remember ever having to do that.  Heck I had plenty of dc motors for toy cars etc... that would start right up as soon as I hit it with a 1.5vdc source directly to the motor.

So, has something changed?

[G7PSK]

Most likely synchronous motors they need a starting force applied to them, either manual or an extra set of winding's.

[Dark Prognosis]

Well, the ones I am seeing have been 2 windings and many magnets but were 100% DC and a synchronous motor is AC.

[SeanB]

Most likely the motors have a very low starting torque, or the brushes and bearings have a very high breakaway torque. You can also have the brushes aligned so that they are not creating a magnetic field, or the field is aligned perfectly with the magnet pole, so there is no torque generated. These motors will then not be self starting unless they are moving already. Most motors are designed so that there is always a shaded pole, or a coil that will generate torque in the magnetic field of the stator. This then makes them self starting, but has a downside of cogging and a slight loss of efficiency.

[Dark Prognosis]

Is there any simulation software (nothing like that around back when I worked with motors) available for motor making?  Windows based.

[Galenbo]

The -2000 indoor electric Forklifts all have DC motors.
Stator windings, Rotor windings, put DC voltage on it, and it drives instantly.

till 1990 simply with serie resistance, and parallel/serie switch,
later models had electronics PWM.

Now most have AC motors. Electronics is there anyway, and AC motors have the advantage
to not have brushes, and brake energy recuperation is more efficient.

.