
In any electric motor application, the target equipment performance dictates the required motor power. The rated power of the motor is calculated from the combination of speed, torque, and duty cycle of the application that in turn establishes the critical voltage, current, and capacity requirements of the battery.. . One motor parameter that affects the performance of battery-powered applications is efficiency. Maximizing motor efficiency helps minimize required power capacity — in turn. . One essential criterion in battery selection is ensuring the battery will satisfy the motor’s voltage and current requirements when fully charged as well as continue to meet those requirements. [pdf]
Battery-powered motor applications need careful design work to match motor performance and power-consumption profiles to the battery type. Optimal motor and battery pairing relies on the selection of an efficient motor as well as a battery with the appropriate capacity, cost, size, maintainability, and discharge duration and curve.
One key motor performance parameter to consider in a battery-powered application is efficiency. Maximizing motor efficiency helps minimize the required power capacity and hence the size and cost of the battery solution. For this reason, brushless DC (BLDC) motors are preferred over brushed DC motors but are typically higher in price.
Generally, for a higher-power motor, a higher voltage is preferable. The selection of battery parameters is based on the range required for the vehicle and the capacity to provide peak discharge current and the duration for the peak current. Battery capacity (Ah or KWh) = (Mileage Requirement / Avg speed) x Avg current or power consumption.
Matching your motor voltage and your battery voltage cannot be understated if you want your setup to even work, let alone cause serious damage. If your motor is rated at 36v, get a 36v battery and so on. Getting a 72v battery and a 48v motor will likely fry your electronics located in the motors controller.
If your motor is rated at 36v, get a 36v battery and so on. Getting a 72v battery and a 48v motor will likely fry your electronics located in the motors controller. Using too low of a voltage will not give enough voltage to even register in the controller and you will not be able to power it up.
Optimal motor and battery pairing relies on the selection of an efficient motor as well as a battery with the appropriate capacity, cost, size, maintainability, and discharge duration and curve. Battery-powered AGVs for automated warehousing require brushless dc motors engineered for top efficiency.

A homopolar motor is very easy to build. A permanent magnet is used to provide the external magnetic field in which the conductor will turn, and a battery causes a current to flow along a conducting wire. It is not necessary for the magnet to move, or even to be in contact with the rest of the motor; its sole purpose is to provide a magnetic field that will interact with the magnetic field induced by the current in the wire. One can attach the magnet to the battery and allow the cond. [pdf]
Complete the motor. Gently place the free end of the copper wire to the side of the magnet. The magnet and the screw should start to spin. When you place the copper wire to the side of the magnet, you complete the circuit between the battery terminals. The current flows from one end of the battery, down the screw, and into the magnet.
The electric flow of current is pushing down towards the magnet. These opposing forces cause an outward motion on the wire – causing it to spin around the magnet. This kind of motor with a battery, magnet, and wire, is called a homopolar motor. Due to the force of magnetism and the flow of electricity, the wire spins one way.
The magnetic field has a positive end and a negative end. The magnetic field is pushing up towards the battery. The electric flow of current is pushing down towards the magnet. These opposing forces cause an outward motion on the wire – causing it to spin around the magnet.
Attach the magnets to the negative terminal of the battery. Balance the copper wire on the positive terminal of the battery. Be sure the wire ends are in contact with the magnets but not with each other. Voila! Watch the copper wire spin. There is a close connection between electrical and magnetic phenomena.
When the wire touches the top of the battery and the magnet (which is touching the bottom of the battery) at the same time, electrical current flows through the wire. This electrical current passes through the magnetic field created by the magnet. This results in a force that pushes on the wire, causing it to spin around the battery.
The battery and the magnet spin because of a tangential force created by the flow of a current through the magnet. The magnitude of the force is given by the product of the current, I, the length, L (which, in this case, equals the radius of the magnet), and the magnetic field strength, B.

Lead Acid Batteriesare one of the oldest rechargeable batteries available today. Due to their low cost (for the capacity) compared to newer battery technologies and the ability to provide high surge currents (an important factor in automobiles), Lead Acid Batteries are still the preferred choice of batteries in almost all. . To charge a battery from AC we need a step down transformer, a rectifier, filtering circuit, regulator to maintain the constant voltage. Then we can give the regulated voltage to the battery to. . Before seeing the working, let me show you how to calibrate the circuit. For calibrating the circuit, you need a variable DC Power Supply (a. [pdf]
The 5 useful and high power lead acid battery charger circuits presented below can be used for charging large high current lead acid batteries in the order of 100 to 500 Ah, the design is perfectly automatic and switches of the power to the battery and also itself, once the battery gets fully charged.
A practical switchmode lead acid battery charger circuit has been presented which incorporates all of the features necessary to assure long battery life with rapid charging capability. By utilizing special function ICs, component count is minimized, reducing system cost and complexity.
This circuit can be used to charge Rechargeable 12V Lead Acid Batteries with a rating in the range of 1Ah to 7Ah. How to Recharge a Lead Acid Battery? Lead Acid Batteries are one of the oldest rechargeable batteries available today.
8.4 How to Set Up the Circuit. Lead acid batteries are normally used for heavy duty operations involving many 100s of amps. To charge these batteries we specifically need chargers rated to handle high ampere charging levels for long periods of time.
Lead Acid Battery Lead Acid Battery is a rechargeable battery developed in 1859 by Gaston Plante. The main advantages of Lead battery is it will dissipate very little energy (if energy dissipation is less it can work for long time with high efficiency), it can deliver high surge currents and available at a very low cost.
The voltage regulator used here is 7815, which is a 15V regulator. The regulated DC out voltage is given to battery. There is also a trickle charge mode circuitry which will help to reduce the current when the battery is fully charged. The circuit diagram of the Lead Acid Battery Charger is given below. 7815
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