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Operation confirmation of Stepper Motor controller

The stationary torque of the stepper motor is large. However, as the turn becomes fast, the turn torque falls. The stepper motor can not do a high-speed turn. A stepper motor is made to control a turn position correctly. It is to control a turn position correctly like the drive motor of the printer and so on. The circuit this time controlled the number of rotations of the motor by the charging of the capacitor but can control a turn angle in the drive number of times (the step) if remodeling software.

By making this controller, I found the following.
    The turn torque falls extremely when the revolution rises.
      It shivered and the motor didn't rotate when making the high-speed side when adjusting control timing.
      When grasping an axis of rotation with the hand when turning at high speed, the turn has stopped immediately.

    The torque in case of stop is large.
      I don't find how much power it is because I don't have a measurement receptacle. However, it doesn't move when not applying considerable power when the motor stops.
A measurement result with number of rotations is shown below.
    The most low speed : 27 rpm
    The full speed : 128 rpm

    The most low speed can make the turn which was more slowly if it makes the value of the capacitor for the speed control big.
    Because the full speed is the speed that the turn stops when applying a few loads, it isn't practical. Because the mass of rotor of the motor is related, this is the speed limitation of this motor.