06-04-2015, 01:57 PM | #1 |
Gone Wild
Join Date: Mar 2008
Location: FL
Posts: 199
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Motor connections
SO, I got a used motor for my cart but the connections are marked different than my original. The new motor, on the right is marked as in the diagram. Can anybody shed some light on this.
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06-04-2015, 02:16 PM | #2 |
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Join Date: Apr 2009
Location: FT Lauderdale FL.
Posts: 16,416
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Re: Motor connections
Can you show some pics of the other end of the motors and the windings . There should be markings stamped in the case. wire wheel it and you may see them. The motor on right looks like it might be a sepex motor. and the one on the left is a series? If so the new motor will not work in your series cart. Two different motors. if the markings in the second pic is on your new motor it will not work
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06-04-2015, 02:46 PM | #3 |
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Join Date: Apr 2009
Location: FT Lauderdale FL.
Posts: 16,416
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Re: Motor connections
Shunt motor
. The field coil and the armature windings are connected in shunt or parallel across the power source. The armature winding consists of relatively few turns of heavy gauge wire. The voltage across two windings is the same but the armature draws considerably more current than the field coil. Torque is caused by the interaction of the current caring armature winding with the magnetic field produced by the field coil. If the DC line voltage is constant, the armature voltage and the field strength will be constant. The speed regulation is quite good; the speed is a function of armature current and is not precisely constant. As the armature rotates within the magnetic field, an EMF is induced in its wining. This EMF is in the direction opposite to the source EMF and is called the counter EMF (CEMF), which varies with rotational speed. Finally, the current flow through the armature winding is a result of the difference between source EMF and CEMF. When the load increases, the motor tends to slow down and less CEMF is induced, which in turn increases the armature current providing more torque for the increased load. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The power difference between the motor input and the output is dissipated in form of heat and constitutes to the losses of the machine. These losses increase with load, since the motor heats up as it delivers mechanical power. Series motor. The field coil and armature windings are connected in series to the power source. The field coil is wound with a few turn s of heavy gauge wire. In this motor, the magnetic field is produced by the current flowing through the armature winding; with the result that the magnetic field is weak when the motor load is light (the armature winding draws a minimum current). The magnetic field is strong when the load is heavy (the armature winding draws a maximum current). The armature voltage is nearly equal to the PS line voltage (just as in the shunt wound motor if we neglect the small drop in the series field). Consequently, the speed of the series wound motor is entirely determined by the load current. The speed is low at heavy loads, and very high at no load. In fact, many series motors will, if operated at no load, run so fast that they destroy themselves. The high forces, associated with high speeds, cause the rotor to fly apart, often with disastrous results to people and property nearby. The torque of any DC motor depends upon the product of the armature current and the magnetic field. For the series wound motor this relationship implies that the torque will be very large for high armature currents, such as occur during start-up. The series wound motor is, therefore, well adapted to start large heavy-inertia loads, and is particularly useful as a drive motor in electric buses, trains and heavy duty traction applications . Compared to the shunt motor, the series DC motor has high starting torque and poor speed regulation |
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