Dongguan Freerchobby Co.,Ltd

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Name: Mark Tan
Tel: +86-18122817459
Add: dongguanshi
Skype: eden198713110
WeChat: 13480179860
whatsapp: +86 13480179860
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I. Type of motors:

1.DC Motors

 1.1 Brushless

 1.2  Brushed

   1.2.1  Series Wound

   1.2.2  Shunt Wound

   1.2.3   Compound Wound

   1.2.4   Permanent Magnet

2. AC  Motors

 2.1  Synchronous

 2.2  Induction

2.2.1  Single Phase


2.2.2  Three Phase

II.  What  is BLDC (brushless DC electric motor) ?

Brushless DC electric motor (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) aresynchronous motors powered by DC electricity via an inverter/switching power supply which produces an AC/bi-directional electric current to drive each phase of the motor via a closed loop controller. The controller provides pulses of current to the motor windings that control the speed and torque of the motor.



III. Sensorless motor and sensored motor

Sensored motors & escs use something called Hall-effect sensors to detect where the rotor ( magnets ) is inside the motor, and send this data back to the esc via the sensor wires, allowing the esc to control the motor's rotation and speed precisely. The downside is that there is lag between the sensor signal arriving at the esc and the esc turning the phases on & off in sequence to spin the motor- the extra wires and hardware is also more vulnerable to damage and adds weight/ takes up space.

Sensorless motors & escs use something called 'back-EMF', where by the esc detects the rotor's position by receiving & interpreting feedback current generated by the motor as the rotor spins inside it and generates EMF pulses. The disadvantage is that this sometimes leads to low-speed cogging as there isnt much EMF for the esc to receive, making it hard for the esc to 'see' where the rotor is- amount of cogging depends on how good the firmware is mainly- castle creations have pretty much perfected sensorless setups, few escs will be smoother these days



IV. Inrunner and outrunner motor

Inrunner motors spin their central part that is wrapped with copper windings. The magnets are on the outer casing that is stationary. Since the electrical windings spin, conductive electrical brushes must be used to make the electrical connection. The brushes caused drag that lowered the efficiency of the motors.

Outrunners still have the copper windings on the inside, but now the magnets on the outside casing spin around. This arrangement completely avoids the need for brushes, a major source of headaches in inrunners.




V. Delivery time and mode of delivery


For small quantity, we usually ship in 7-10 days if there is material in stock after payment done; for large quantity, it will take 20-40 days .

We can ship by DHL( HK DHL, Mainland DHL, Authority DHL ), TNT, Fedex IE, HK UPS,China post, EMS etc.



VI. Warranty time

One year.



VII.  Motor overheating

There are many factors that cause motor issues, but here are six reasons your motor may be overheating:


It is important to make sure the motor you are using has been properly sized for the application, environment and duty cycle it will be performing in. A motor that is too small will not be able to dissipate heat quickly enough, and the motor will overheat.


If a motor is running in a much warmer environment than it was designed for, it can overheat because the ambient temperatures will make it more difficult for the motor to cool down properly. Check the insulation class of your motor (found on the motor’s nameplate).


It is important to run motors that are rated for intermittent duty applications at or below their duty cycle. In order for the motor to run at its rated performance specs, it needs to have time to cool-down completely between cycles. If the motor is run more frequently than it is supposed to, the motor will still be warm and will become increasingly hotter with each cycle, eventually overheating the motor.


Power supply may be insufficient due to amp draw. In order to overcome load or inertia at a stand-still, the motor’s running current will be much too high under load. Incorrect voltage supply will make the motor work harder and could cause it to overheat.

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