How to Choose a R/C Toy Motor

Toy motor is the main power source to keep the power of toys. Designers have little opportunity to design a toy motor in toy production. There are many techniques and methods for the selection of toy motors.

Find the appropriate speed ratio and torque

The standard of the toy motor factory is the no-load speed, and the speed ratio is calculated, it is generally used to calculate no-load speed. The speed ratio of the walking toy is between 80~150, because the toy product is not a kind of precise machine, so it can be adjusted to the actual transmission ratio. For example: gear transmission in a section of the tooth number ratio of 20:8, the experiment found that the speed is too slow you can try 22:6, if the speed is too fast, but also for 18:10, this approach is very convenient.

Toy motor products have a maximum load data, there is a load and the speed of the relationship. Because the toy products are generally not very large and battery driven, so the load of the toy motor is not very large. In general, the greater the load and torque, the larger the size of the toy motor, the battery to be more, and the heavier the weight of the toy, so as far as possible to choose the appropriate toy motor. Generally, the load and speed of the motor in the curve of the region will rise. If you want to save costs, in the case of a high-power motor can be found in the case of a small power to try. Through repeated tests, a toy motor with small power and can meet the requirements is found.

Radio interference test

The working principle of the toy motor is to continuously change the current in the coil by the brush, thus ensuring the continuous rotation. It can be imagined that the larger the magnet in the motor, the longer the coil, the greater the torque will be, and the change of the current will form an electromagnetic wave. The existence of electromagnetic waves will interfere with a variety of household appliances. If a child is waiting for a plane to play with the motor of the toy, it may affect the aircraft landing. So in the actual work will add an anti interference washer (such as DV WASHER, about 0.5 Hong Kong dollars), but the general design will be in the two electrode motor on a parallel capacitor or a ceramic resistor (stable circuit function), a reduction of the brush and the influence of rotor coil current for the stability on the other hand. In practical work, it is possible to use a small radio to do interference test equipment.

The toy is generally the rotating shaft of the motor shaft and the iron, iron shaft directly with a tight 6 teeth or 8 teeth of 0.5 modulus gear (or a small pulley or lever, when the gear is pan) or pot rod, especially pan rod, because just starting moment, between tooth and tooth will a card, then the current coil will increase, iron axial vibration and the move will interpret the cards, so don't put in a fixed motor shaft in the axial direction on the fixed die (less to 0.5mm allowance).

Placement should pay attention to reduce noise

Is the resistance of the coil, the current through the resistor will heat, so the motor shell cannot be directly exposed to the best at the same time, the motor can not be placed in the small box closed, closed space will lead to not easy to distribute the heat sealed, and a small box will become a big motor noise sound put.
Motor products are the biggest problem is the noise, although this noise may not have security problems, but it does not sound comfortable. The biggest problem is the noise of high speed gear, the general tooth and the middle of the gap between the teeth will be between 10 to 20 wire (for the gear of the 0.5 model). The gap is too small, the high speed gear will impact noisier; too much, lack of power on one hand, on the other hand, there will be noise, so sometimes use a pulley or a soft driving gear (such as wheel PE) to reduce the noise, of course, you can also add a little oil motor (nontoxic horse as oil).

However, we should also pay attention to the motor with the best parts of the teeth do not work with the pieces, especially the larger with a relatively closed space of the pieces of a piece of work, that is, in a large piece of paper directly on the production of dental splint, such as battery boxes, car chassis, etc.. These relatively confined space will play a role in the amplifier, several times to enlarge the noise. The author has experienced a lot of this design, such as the direct motor fixed at the bottom or side of the battery box, the noise will be very terrible. In one instance, a company developed a 1.5 foot remote control car (the Beatles appearance), was at the bottom of the vehicle directly make tooth box, which is directly fixed on the motor vehicle, because it saves a mold of money, while reducing the assembly time, but direct transmission to the vehicle noise and vibration caused by vehicle resonance the noise is very large. Finally, we have to re do a set of mold, the teeth out of the box, and in the case and the bottom of the car to install the seat pad  to absorb vibration to solve the problem. It can be seen that when the noise of the toy is very large, it can be used to reduce the noise and reduce the noise by adding sponge or other soft materials (such as rubber sheets, etc.).

Method for fixing and realizing positive inversion

The two ends of the motor are designed with a fixed position to prevent rotation. As long as the size of the reference motor diagram, with the upper and lower clamping two pieces can be. Generally not fixed motor shell body, because on the one hand the heat is not good, but on the other hand, it is difficult to achieve stable fixation, unless the structure of tens of thousands have not, can also play motor screws (special screw holes on the motor)

Positive inversion toy motor can be used to change the direction of the battery and the pros and cons of two kinds of steering (by mechanical switch to change, also can through the electronic control), which means that a motor can get two different action. Such as: the motor is transferred to the simulation animal walk forward, while the motor is reversed, making it stop and wagging its tail, shaking, the achievement of these movements is passed through a gear rotating process, the driving wheel has a tangential force to achieve the conversion principle, namely through the positive direction of rotation of the motor driven by a set of gears, and in reverse when another group of gear drives. Can be tangential to the axis of jumping called axis.

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