Explain how a permanent magnet windscreen wiper motor achieves 2 speeds?

Answer 1

Well, darling, a permanent magnet windscreen wiper motor achieves 2 speeds by using different resistors in the circuit to control the current flow. When you switch to a higher speed, the resistor is bypassed, allowing more current to flow and increasing the speed of the motor. It's all about playing with resistance to make those wipers work at different speeds, honey.

Answer 2

A permanent magnet windscreen wiper motor achieves two speeds by using a dual winding configuration. The motor has two separate windings, each with a different number of turns, which creates two different magnetic fields and therefore two different speeds. By switching between these windings using a control mechanism, the motor can operate at either a high or low speed depending on the desired setting. This design allows for efficient and reliable operation of the windscreen wiper motor at different speeds.

Answer 3

Well, isn't that just a happy little question! You see, a permanent magnet windscreen wiper motor achieves two speeds by using a simple but effective design. By varying the electrical current flowing through the motor windings, the magnetic field strength changes, which in turn alters the motor's speed. It's all about finding that perfect balance to create those gentle sweeps on low speed and those vigorous wipes on high speed. Just like painting, it's all about finding the right technique to make something beautiful happen.

Answer 4

Almost certainly due to the Voltage allowed to the motor by the controller (resistor).

Adding a resistor will work, but is inefficient as the unused energy is wasted as heat.

Two speeds are achieved by using a third brush,

With the standard brushes in use. 180 derees around the commutator, current passes through all the rotor windings. The resistance sets a specific current draw and the motor runs at a standard speed.

The high speed switch position feeds power in tothe motor through a third brush set at about 160 degrees from the earth brush. Current now passes through fewer rotor windings - less resistance - more current flow - higher motor speed.