- How to rotate pattern in floor generator generator#
- How to rotate pattern in floor generator driver#
1.8, the induced voltage in b is positive and in a is negative.
![how to rotate pattern in floor generator how to rotate pattern in floor generator](https://4.bp.blogspot.com/-9IfoMYebbTs/V5jvYvYv1xI/AAAAAAAAHTI/xgKYk9A4CIMstkPnwj_8Ha5mxFyyQN19gCKgB/s1600/2016-07-28_002808.jpg)
How to rotate pattern in floor generator generator#
The induced voltage is connected to the generator terminals through the commutator and brushes. The voltages generated in the two sides of the coil are added. The cutting of the field lines generates a voltage in the conductors. On the other hand, the conductors in slot b are cutting the field lines exiting from the rotor to the south pole. 1.8 that the conductors in slot a are cutting the field lines entering into the rotor from the north pole.
![how to rotate pattern in floor generator how to rotate pattern in floor generator](https://i.ytimg.com/vi/faMzYeALJp0/maxresdefault.jpg)
(B) Rotor current flow from segment 2 to 1 (slot b to a). (A) Rotor current flow from segment 1 to 2 (slot a to b). Note that “salient” means “to stick out,” “to protrude.”įigure 1.8.
How to rotate pattern in floor generator driver#
The next step in understanding the stepper motor, and before introducing the current sequencing power driver circuit, is to explain the coil winding methodology around the eight salient stator pole pieces. This means that we need a bipolar current driver in order to sequence the stator coil currents to produce rotor rotation. 4.17 shows the mmf vectored outward and Fig.
![how to rotate pattern in floor generator how to rotate pattern in floor generator](http://i.ytimg.com/vi/6s_eM-wqlg0/default.jpg)
In order to achieve the four opportunities for pole piece attraction as listed above, it is necessary to reverse the mmf in the stator pole pieces. These concerns are examined later by undertaking experiments on the stepper motor to determine its “pull-in” and “pull-out” stepping rates in order to drive the stepper motor effectively. Care must be taken so that the stepper motor is neither accelerated too quickly nor stepped at too high stepping rate. The problem is overcome by driving the rotor to a known position, measured by a sensor and then the stepper motor is driven in a specified profile by counting the number of steps CW or CCW. It is because a stepper is an open-loop device meaning that the rotor shaft angle is not measured. This means that when the stepper motor is switched on, the rotor will take up an unknown position which is the major disadvantage of the stepper motor. 4.19 that the next position that is stable for the rotor is at ± 1 tooth pitch away from the quiescent position. CW torque acting on rotor versus angle deviation from tooth-to-tooth alignment and tooth-to-gap alignment. This phenomenon is known as “losing lock” and will be analyzed later in more detail with “pull-in” and “pull-out” tests.įig. This means that the rotor position becomes unstable meaning that the rotor will rotate uncontrollably. However, there comes a point when the restoring torque reaches a maximum at approximately ¼ tooth pitch on either side of the quiescent position and the slope of rotor torque against rotor angle starts to become negative. The effect is to replicate a mechanical spring. The further the rotor deviates from the quiescent position the greater the restoring torque. Likewise if the rotor is disturbed in the CCW direction then there will be a CW restoring torque. For example, if the rotor is disturbed in the CW direction then there will be a –ve CW torque, that is, a CCW torque, acting on the rotor to try to restore it to its quiescent position. As the rotor deviates from its quiescent zero torque position it experiences a restoring torque. The torque that acts on the rotor for a given stator coil current status is shown in Fig. The coils are not shown for the sake of clarity. 4.17 and 4.18 show how the stator coils and stator pole pieces hold the rotor in a given angular position. In order to move the rotor to a new angle, the stator coils are switched to a new status and the rotor will shift to a new angular position. The applied torque must not exceed a certain value otherwise the rotor will “lose lock” and slip to an unknown position. However, if it is deflected a little either side of that angle with an applied clockwise (CW) or counterclockwise (CCW) rotor torque then the rotor will experience a “restoring torque” that will try to pull the rotor back to its zero torque angular position. At this new position the torque on the rotor is zero. The principle is to switch the stator coil currents to attract the rotor to a new angular position. These tangential forces produce a torque on the rotor that is transferred to the axle.
![how to rotate pattern in floor generator how to rotate pattern in floor generator](https://i.stack.imgur.com/Z50TU.png)
The rotor is motivated to rotate by attractive magnetic forces acting in a tangential direction at the periphery of the rotor.