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Hybrid Stepper Motor The Advantages Of

May 19, 2017


Hybrid Stepper Motor: stepper motor is divided into three kinds: permanent magnet (PM), reactive (VR) and mixed type (HB). The permanent magnet stepping is generally two-phase, the torque and the volume are small, the step angle is generally 7.5 degrees or 1.5 degrees; Hybrid Stepper Motor the reaction step is generally three-phase, which can realize the large torque output, the step angle is generally 1.5 degrees, but the noise and the vibration are very big. In Europe and the United States and other developed countries in the 80 's have been eliminated; It is divided into two phases, three-phase and five phases: two-phase stepping angle is generally 1.8 degrees and five-phase stepping angle is generally 0.72 degrees, the hybrid stepper motor with the phase number (the number of electric windings) increase, the step angle is reduced, the precision is improved, this kind of stepper motor is the most widely used

Stepper motor as the implementation of components, Mechatronics is one of the key products, widely used in a variety of automation equipment. The difference between a stepper motor and a general motor is that it is an actuator that converts an electrical pulse signal into a angular Hybrid Stepper Motor displacement, which simultaneously completes two tasks: one is the transfer torque and the other is the control of the corner position or speed. The working principle of the motor: The schematic diagram of two-phase stepper motor, Hybrid Stepper Motor it has 2 windings. When a winding is energized, its stator magnetic pole generates a magnetic field, and the rotor is sucked into the magnetic pole. If the winding in the control of the pulse, the power of the direction of the order in accordance with the four states of the cycle of change, the motor can rotate clockwise; Control the pulse of each function once, the direction of power changes once, so that the motor rotation step, that is, 90 degrees. 4 pulses, the motor turns round. The higher the pulse frequency, the faster the motor rotates, the more complex the actual motor is than the model, Hybrid Stepper Motor and each step is generally 1-8 °. The output torque of the stepper motor is proportional to the effective volume of the motor, the coil turn number, the flux and current, so the larger the effective volume of the motor, the greater the number of the excitation ampere, the smaller the air gap between the rotor, the greater the torque of the motor, and the smaller the lower. Stepper Motor Term: Phase number: Refers to the number of coils within the motor, currently commonly used in two-phase, three-phase, four-and five-phase stepper motor. Step angle: Corresponding to a pulse signal, Hybrid Stepper Motor the motor rotor shifted the angular displacement. General two-phase motor with a step angle of 1.8 degrees, that is, motor movement 200 steps of one weeks. Static moment (holding torque): refers to the stepper motor to the rated current but does not rotate when the stator locks the rotor torque. It is one of the most important parameters of stepper motor, and usually the torque of stepper motor at low speed is close to static moment. Positioning torque (Detent torque): Refers to the stepper motor without power, the stator lock rotor torque. Precision of Step angle: The error of the actual value and the theoretical value of each step of the stepper motor. Expressed as a percentage: (Error/step angle)? 0 7 100%. The error of the step angle does not accumulate. Maximum no-load starting frequency: Motor In some driving form, voltage and rated current, in the case of no load, can directly start the maximum frequency. Maximum no-load operating frequency: Motor in a certain type of drive, voltage and rated current, the motor without load the highest operating frequency. Phase current: Motor windings through the current. Motor Torque-frequency characteristics: the motor under a certain test conditions of the output torque and the pulse frequency of the curve is called the motor torque and frequency characteristics, which is the most important in many dynamic curves of the motor, but also the fundamental basis for the selection of motor. At low speed, the motor torque is close to the static moment, and the motor output torque decays with the increase of motor speed. The dynamic torque of the motor depends on the phase current at the rated current and voltage, the greater the phase current, the greater the output torque of the motor, the higher the voltage and the greater the torque during the high-speed operation. The torque-frequency characteristic curve of the same motor can be different in various actuators, so the selection should be left with more than one quantity. The resonant point of the motor: The step motor has a relatively fixed resonant region, and the resonant region of the 2 and 4 phase hybrid stepper motor is generally between 180 (step angle 1.8 degrees). The higher the driving voltage of the motor, the greater the current of the motor, the lighter the load, the smaller the motor, the greater the resonant region. In order to make the output torque of the motor big, without losing the step and making the noise of the system lower, the general working point should be shifted to the resonant region more. Note: Subdivision changes the location of the resonant region. Missing step (missing Step): The controller gives the motor an n pulse, and the stepper motor does not rotate N-step angle. Generally, when the torque of the motor is small, the acceleration is too large, the speed is high, the friction is uneven, etc. Stepper Motor type: stepper motor including reactive Hybrid Stepper Motor stepper motor (VR), Permanent Magnet Stepper Motor (PM), Hybrid Stepper motor (HB) and so on. The permanent magnet stepper motor is generally two-phase, the torque and the volume are small, the step angle is generally 7.5 degrees or 15 degrees; reactive stepper motor is generally three-phase, can realize large torque output, the step angle is generally 1.5 degrees, but the noise and vibration are very large. The rotor magnetic circuit of the reactive stepper motor is made of soft Hybrid Stepper Motor magnetic material, the stator has a multiphase excitation winding, and the torque is generated by the change of the magnetic conductivity; The hybrid stepper motor is a stepper motor designed to synthesize the advantages of permanent magnet and reactive type. It is divided into two phases and five phases: the two-phase stepping angle is generally 1.8 degrees, while the five-phase step angle is generally 0.72 degrees. At present, two-phase hybrid stepper motor is most commonly used. Stepper Motor polarity: stepper motor separate bipolar motor and unipolar motor. In the case of a bipolar motor, the current in the 2-coil flow sequence is AA-0 3 bb? 0 3 AA 0 3 b b; whereas the current flow direction of the unipolar motor coil is fixed by a single polarity motor drive with a simple, but unipolar motor output. Stepper motor Coil String, parallel: Many 2-phase stepper motor has 8 leads, the motor can be connected in tandem and can be connected in parallel. In series connected motor, the current is small, the low frequency torque is bigger, the parallel connection motor, the inductance is small, therefore starts, stops the speed to be quicker, the high frequency torque has the increase