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

The invention relates to a high-quality three-phase alternating current permanent magnet servo synchronous motor, which comprises a stator and a rotor, wherein a stator core of the motor has 12 slots, the stator core is inclined for 7 / 32 pitches, the pole number is 10, and the phase number is 3; and a stator core three-phase winding is a fractional slot concentrated winding, the pitch of winding coils is 1, the number of turns of each coil is equal, and the difference of the three-phase winding is 120-degree electrical angles. The three-phase winding has 6 lead-out wires and provides two wiring methods. A rotor permanent magnet structure is in a built-in type, N and S poles of neodymium iron boron permanent magnets are alternately embedded into a ladder-shaped groove stacked into a rotor core by a rotor stamping piece, the rotor core is axially divided into two sections equally, and the central line of two sections of magnets with the same polarity is axially deflected for 4mm; and the excircle and the axle hole of a pole shoe of the rotor core are not concentric, ununiform air gaps are formed between the pole shoe of each pole and the inner circle of the stator core, and a plurality of measures are adopted to greatly improve the sine property of a phase voltage waveform of the motor and motor quality. The invention is suitable for the three-phase alternating current permanentmagnet servo synchronous motor.

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 discloses a winding-dynamically-changeable speed-adjustable permanent magnet synchronous motor and a control method thereof. Winding connection modes are changed through switches connected with windings, so that a counter electromotive force can be decreased. According to three-phase / double-three-phase conversion, the windings of a double-three-phase motor are connected in series when the motor is at a low speed, so that one three-phase winding is formed; when the motor is at a high speed, two sets of windings of the motor are respectively connected with two inverters. By means of three-phase / double-three-phase conversion, the motor can be set to be two rated points; during three-phase connection, the rated points can be low-speed rated points; when the rotating speed of an ordinary speed-adjustable motor increases gradually, weak magnetic current gradually increases, and as a result, the performance of the motor is reduced; and when the rotating speed of the motor provided by the invention exceeds 2 times of the rotating speed of the low-speed rated points, double three-phase connection is adopted, and a counter electromotive force is reduced to 1 / 2 of an original counter electromotive force, and therefore, weak magnetic current can be effectively reduced, and the efficiency of the motor can be improved, and the operating range of the motor can be extended.

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.

The invention provides a permanent magnetic synchronous motor in a wide weak-magnetic speed-regulating range, belongs to the field of motors, and aims at solving the problem of the permanent magnetic synchronous motor with a traditional structure existing in weak-magnetic speed-regulation, when the flux linkage psi f of the motor is larger, the direct-axial inductance Ld is smaller, so the motor runs in a wider speed range by greatly increasing the limiting current ilim, and the capacity of an inverter is increased. The permanent magnetic synchronous motor comprises a stator and a rotor, wherein the rotor is in a structure that: a plurality of permanent magnets are arranged between the outer circle surface of a rotor yoke and the inner circle surface of a magnetic rotor sheath; the numberof pole pairs of the motor is p; each rotor pole consists of 2n-1 permanent magnets; the outer edge of a radial section of the magnetic rotor sheath is formed by 2p sections of curves; each curve corresponds to one rotor pole, and is a curve spliced by arc pole shoe sections, the two arc pole sections are concentric, circle centers of all the arc pole sections in the 2p sections of curves are positioned on the same circumference, and the circumference is concentric with a rotor shaft.

The invention provides an independent hydraulic drive system of an automobile. The independent hydraulic drive system of the automobile comprises a power system, an energy storage system, an actuating mechanism, a brake system and a control system. The power system comprises an engine, a clutch connected with the engine, and a motor connected with the clutch. The energy storage system comprises a storage battery pack and an energy accumulator, and the storage battery pack can be used for driving the motor to rotate. The actuating mechanism comprises a variable pump capable of being driven by the motor, and the variable pump drives another motor to rotate so that wheels can be driven to rotate. The brake system comprises a brake valve set and brakes coaxial with the wheels. The control system comprises a controller, a rotation speed sensor, a steering sensor, a pressure sensor, a gear shift switch and a brake pedal. The controller can control the engine to output kinetic energy to the outside, or control the engine to stop and make the storage battery drive the motor to rotate so that kinetic energy can be output to the outside. The independent hydraulic drive system of the automobile can achieve infrared silence of the automobile, automobile speed regulation in an ultra-large range, automatic gear shifting and energy recycling.