Electric motor
A DC electric motor has a stack of laminations defining a rotor with at least two pairs of poles and an even number of slots at least equal to 8. The rotor also has a commutator with an even number of segments and a closed distributed rotor winding. The winding extends in the slots and is connected in a predetermined manner to the segments of the commutator. The rotor winding has a winding section of the lap type, connected to two consecutive segments of the commutator and, in series with this, a plurality of winding sections of the wave type. These winding sections all span an identical number of slots.
1. A direct current electric motor with at least two pairs of poles, comprising: a rotor including a stack of laminations that defines an even number of slots at least equal to 8, a commutator with an even number of segments, and a closed distributed rotor winding, the wire of which extends in said slots and is connected in a predetermined manner to the segments of the commutator; and
brush gear for transferring electrical power to the rotor winding via the commutator,
wherein the rotor winding comprises a single winding section of the lap type, connected to two consecutive segments of the commutator and, in series with this, a plurality of winding sections of the wave type, said winding sections all spanning an identical number of slots.
2. The motor of claim 1 , wherein said winding section of the lap type is the first that is formed when making the winding of the rotor.
3. The motor of claim 1 , wherein the motor has two pairs of poles, eighteen slots, and eighteen segments and each winding section of the rotor winding spans three slots.
4. The motor of claim 1 , wherein the brush-gear comprises only two brushes cooperating with the commutator.
5. The motor of claim 1 , wherein the winding comprises a single insulated wire.
6. The motor of claim 1 , wherein the number of segments is equal to the number of slots of the rotor.
7. The motor of claim 1 , wherein the number of winding sections is equal to the number of segments.
8. The motor of claim 7 , wherein the number of winding sections is equal to the number of segments.
9. The motor of claim 1 , wherein the number of lap type winding sections is one.