43results about How to "Expand the range of speed regulation" patented technology

The invention relates to a stator for an electric car hub motor and a motor containing the same. The stator for the electric car hub motor comprises a stator core and a bracket; the stator core is fixed on the bracket, the outer diameter of the stator core is 205.01-212mm, the notch width of the stator core groove, the stator core outer diameter, the stator core inner diameter, the yoke thickness of the stator core, and the stator core groove number meet the following relations: the notch width of the stator core groove=(alpha+ the value of the single-layer silicon steel sheet thickness of the stator core)*Pai*(stator core outer diameter-stator core inner diameter-yoke thickness of the stator core) / stator core groove number, wherein the value range of alpha is 0.3-0.9. The stator disclosed by the invention has the beneficial effects: the stator structure of the invention reasonably optimizes the electric power and magnetic power in the motor magnetic circuit design, the quick heating condition of the motor caused by short-term overload is avoided, the problems that a winding insulation layer is damaged and the Hall position sensor is invalid are prevented, and the service life of the motor is increased.

Disclosed is a numerically controlled four-roller plate rolling machine with three linked and adjustable rollers, the plate rolling machine comprising: a base (4), two supports (1) positioned on the base (4), and an upper roller (21), a lower roller (22), a first side roller (23) and a second side roller (24) positioned between the two supports (1). The upper roller (21), the lower roller (22), the first side roller (23) and the second side roller (24) are arranged parallel to each other; the lower roller (22) is located directly below the upper roller (21); and the first side roller (23) and the second side roller (24) are located on two sides of the lower roller (22) respectively, wherein the upper roller (21) is mounted on the supports (1) and rotatably connected to the supports (1). The upper roller (21) is driven to rotate by a servo drive device for the upper roller. Two ends of the lower roller (22), the first side roller (23) and the second side roller (24) are mounted respectively to side roller linkage mechanisms (3) on two sides; the relative positions of the three rollers are invariant; and the side roller linkage mechanisms (3) on two sides are respectively connected to the supports (1) and the base (4) via lifting mechanisms (5). The numerically controlled four-roller plate rolling machine with three linked and adjustable rollers is stable in operation, favourably controllable in precise positioning, efficient and highly automated in numerical control, and can easily achieve the rolling of thin-walled cylinder workpieces having a special shape such as an elliptical or square shape, and the shaped product is of high precision and good quality.

The invention discloses an induction motor driving system which comprises the components of a two-phase induction motor, a power filter circuit, an H-bridge power driving circuit and a microcontroller unit MCU. The power filter circuit is used for filtering a harmonic component on a DC power supply and generating a power supply middle-point voltage required for driving. The microcontroller unit MCU is used for generating a switching control signal which is required for operation of the H-bridge power driving circuit. The H-bridge power driving circuit is used for generating a driving current and transmitting to the two-phase induction motor. The two-phase induction motor is used for receiving the driving current which is generated by the H-bridge power driving circuit. The induction motor driving system has advantages of remarkably reducing loss, reducing cost, improving reliability and motor efficiency, expanding speed regulation range and reducing noise.

The invention belongs to the technical field of permanent magnet motor control, and aims at effectively improving the rotating speed range of a motor and reducing the harmonic waves of a three-currentcurrent on the basis that a hardware circuit of a five-bridge-arm two-permanent-magnet-motor system is not changed. The invention discloses a zero voltage vector optimization modulation device and method for the five-bridge-arm two-permanent-magnet-motor system, and the system consists of a five-bridge-arm inverter, two permanent magnet synchronous motors and a microprocessor. The input of a three-phase power grid and an uncontrollable rectifier bridge serves as the input of the five-bridge-arm inverter, and each bridge arm of the five-bridge-arm inverter is formed by the series connection oftwo switching tubes, wherein the series connection points output one phase for the control of the two permanent magnet synchronous motors. The microprocessor is provided with a speed ring and currentring PI (proportional-integral) controller, carries out the space voltage vector pulse width modulation, and controls the generation of on / off signals of the switching tubes to drive the motors to operate. The device and method are mainly used for the control of the permanent magnet synchronous motors.