The basic principle of Tongmao Linear Motors is that linear motors have unique characteristics that cannot be replaced by rotary motors. However, it is not a good idea to use a linear motor in any situation. To do this, one must first understand the basic criteria for linear motor selection so that it can be used properly. The basic principles of its Tongmao linear motor have the following four main points:
1. Suitable thrust, rotary motor can adapt to a large thrust range. The different speeds and torques can be obtained by matching the rotary motors with different gearboxes. At low speeds, the torque can be increased by several tens to hundreds of times, so that with a small rotating motor it is possible to push a large load, and of course the power is conserved. The linear motor is different. It cannot change the speed and thrust with the gearbox, so its thrust cannot be expanded. To get a larger thrust, only rely on increasing the size of the motor. This is sometimes uneconomical. In general, linear motors are suitable for driving light loads in industrial applications.
2. The appropriate movement speed, linear motor movement speed and synchronization speed, and synchronous speed is proportional to the pole pitch. Therefore, the range of pole pitch selection determines the range of motion speed options. Too small a pole pitch will reduce the utilization of the slot, increase the slot leakage resistance and reduce the quality factor, thereby reducing the efficiency and power factor of the motor. The lower limit of the pole pitch is usually 3cm. There can be no upper limit for the pole pitch, but when the output power of the motor is fixed, the longitudinal length of the primary core is limited; at the same time, in order to reduce the longitudinal edge effect, the number of poles of the motor cannot be too small, so the pitch cannot be too large.
3. Appropriate reciprocating frequency, in industrial applications, the linear motor is reciprocating. In order to achieve higher labor productivity, a higher reciprocal frequency is required. This means that the linear motor must complete the stroke in a short time. In one stroke, it needs to undergo acceleration and deceleration, that is, to start once and brake once. The higher the reciprocal frequency is, the greater the acceleration of the linear motor is. The greater the thrust corresponding to the acceleration, the thrust corresponding to the acceleration may even be greater than the required thrust of the load. The increase of the thrust leads to the increase of the size of the linear motor, and the increase in its mass causes the thrust corresponding to the acceleration to further increase, sometimes resulting in a vicious cycle.
4. Appropriate positioning accuracy, in many applications, the motor stops running when the motor is in place. In order to make the impact small when in place, a mechanical buffering device may be added. In the case where there is no mechanical limit, a simpler positioning method is to control the linear motor before the position is reached by the limit switch, and then make a reverse braking or energy braking on the linear motor to stop it when it is in place.
Kunshan Tongmao Electronics Co., Ltd. is a professional R&D and manufacturer of high-performance, high-quality linear and oscillating motion solutions. Its main products are linear motors, voice coil motors and system integration. We will provide you with advanced technologies and High-performance sports series products meet the needs of your large number of oems at low cost. Welcome a lot of friends to pay attention to Tongmao linear motor, hotline: 400-007-7724
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Linear motor