HEW motor Germany HEW model HEW price

HEW motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is far smaller than that of ordinary motors of equivalent power. Connected directly to the prime mover, they eliminate traditional reduction gears. Reasons such as the low moment of inertia of high-speed motors result in advantages including high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

HEW motor advantages

The motor consists of the motor body and the driver, representing a typical mechatronic product. The stator windings of the motor are mostly configured in a three-phase symmetric star connection, very similar to three-phase asynchronous motors. Permanent magnets that have been magnetized are bonded to the rotor of the motor. To detect the polarity of the motor rotor, position sensors are installed inside the motor. The driver is composed of power electronic devices and integrated circuits, among others. Its functions are: to accept start, stop, and brake signals from the motor to control the starting, stopping, and braking of the motor; to accept signals from position sensors and forward/reverse rotation signals to control the switching of each power transistor in the inverter bridge, generating continuous torque; to accept speed commands and speed feedback signals to control and adjust the rotational speed; and to provide protection and display functions, etc.

HEW motor performance

Motor performance comparison: Comparison of servo motor and stepper motor performance. As an open-loop control system, stepper motors have an essential connection with modern digital control technology. In domestic digital control systems, the application of stepper motors is very widespread. With the emergence of all-digital AC servo systems, AC servo motors are also increasingly applied in digital control systems. To adapt to the development trend of digital control, motion control systems mostly adopt stepper motors or all-digital AC servo motors as actuator motors. Although both are similar in control method (pulse train and direction signals), there are significant differences in usage performance and application scenarios. A comparison of their usage performance follows. One, different control precision: The step angle of two-phase hybrid stepper motors is generally 1.8° and 0.9°; the step angle of five-phase hybrid stepper motors is generally 0.72 ° and 0.36°. Some high-performance stepper motors achieve even smaller step angles through microstepping. Two, different low-frequency characteristics: Stepper motors are prone to low-frequency vibration at low speeds. The vibration frequency is related to the load condition and driver performance; it is generally considered that the vibration frequency is half the no-load slewing frequency of the motor. This low-frequency vibration phenomenon, determined by the working principle of stepper motors, is very unfavorable for the normal operation of machinery. When stepper motors operate at low speeds, damping techniques should generally be used to overcome low-frequency vibration, such as adding dampers to the motor or adopting microstepping technology in the driver. AC servo motors operate very smoothly, without vibration even at low speeds. AC servo systems have resonance suppression functionality, which can cover insufficient mechanical rigidity. Furthermore, the system internally possesses frequency analysis capability (FFT), which can detect mechanical resonance points, facilitating system adjustment.

HEW motor classification

The stator and rotor cores of the motor have similar tooth slots distributed on their inner and outer surfaces according to a certain pattern. The change in the relative position of the stator and rotor core teeth causes a change in the magnetic reluctance of the magnetic circuit, thereby generating torque. The rotor core is made of silicon steel sheets or soft magnetic materials. When one phase of the stator is energized, the rotor will rotate to the position where the magnetic reluctance of the magnetic circuit is minimized. When another phase is energized, the rotor rotates to another position where the magnetic reluctance of the magnetic circuit is minimized, and the motor stops rotating. At this point, the rotor has rotated by a step angle θb, where N represents the number of operating steps for the rotor to rotate through one tooth pitch; ZR represents the number of rotor teeth. There are many structural forms of reluctance stepper motors. The stator core can be single-segment or multi-segment; the magnetic circuit can be radial or axial; the winding phases can be three-phase, four-phase, or five-phase. The step angle of a reluctance stepper motor can achieve 1°～15°, or even smaller, with easily guaranteed precision, higher starting and operating frequencies, but larger power consumption and lower efficiency. Hybrid stepper motors have a similar structure of stator and rotor cores as reluctance stepper motors. The rotor has permanent magnets that generate a unipolar magnetic field in the air gap, which is modulated by the tooth slots of the soft magnetic material on the rotor. Hybrid stepper motors combine the advantages of both permanent magnet stepper motors and reluctance stepper motors, offering small step angles, high precision, high operating frequency, low power consumption, and high efficiency.

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