Why can't stepping motor brake stop?
Although the stepper motor has been widely used, but stepper motors can not be like ordinary DC motors, AC motors in the regular use. It must be composed of double ring pulse signal, power drive circuit and so on, and the control system can be used. Therefore, it is not easy to make good use of stepping motor. It involves many specialized knowledge, such as mechanical, electrical, electronic and computer. Stepping motor, as an actuator, is one of the key products of mechatronics. It is widely used in various automatic control systems. With the development of micro electronics and computer technology, the requirement of stepping motor is increasing day by day, and it is applied in every national economic field.
The stepping motor is an open loop control element which transforms the electric pulse signal into angular displacement or linear displacement. In the case of non overloaded, the motor speed and stop position depends only on the pulse frequency and pulse number, regardless of load changes, when the stepper driver receives a pulse signal, it drives stepper motor to set the direction of rotation of a fixed angle, called "step", it is the rotation of the fixed point of the operation step by step. Number of pulses can be controlled by controlling the angular displacement, so as to achieve the purpose of accurate positioning; at the same time by controlling the pulse frequency to control the motor rotation speed and acceleration, so as to achieve the purpose of speed.
The reduction gear ratio gearbox with stepper motor to keep the torque or braking torque can also have a braking effect with a large, but good gear box is more expensive than a brake, if only to use the brakes feel no need to choose.
Stepper motor itself has to maintain torque, the use of motor torque to maintain the power in the case of locking the motor, that is equivalent to the brakes. But if you keep stepping motor torque is not big enough, need to lock greater torque, back stepping motor or power lost under the condition of holding torque can be used with the brakes of the stepper motor. Stepper motor brake spring general and permanent magnet, the permanent magnet brakes faster (within 50ms can lock), low noise, less heat, can be energized or power off brake brakes, but the commonly used power off brake. The permanent magnet will cost a little more expensive, the manufacturer is relatively small, can see Shenzhen city vcto mechanical and electrical limited company website about permanent magnetic brake materials and instructions.
