Delta Electronics, Inc.

Shanghai Moons' Electric Co., Ltd.

Wanbing Jin

Wen-Shi Huang

Jianping Ying

Shih-Ming Huang

Zhigan Wu

Weizi Wang

Lijian Wu

Binsong Tang

Huifan Nie

Xin He

Jian Ni

Qiong Yuan

Xiaotian Tan

Bang Yuan

The invention relates to a nested winding for a slotless motor. The nested winding is formed by inner and outer windings which are nested together and have different inner and outer diameters, wherein the number of the inner and outer windings is n, same-phase coils are connected in parallel or in series, and the number n of the nested inner and outer windings is equal to or greater than two. Compared with the prior art, the nested winding has the following advantages: a potential difference between the coils connected in parallel can be effectively reduced, and accordingly, the loss of the winding is reduced, and the high-speed operating performance of the motor is improved.

Nested winding for slotless motor

The present invention relates to a shaft-embracing permanent magnet inter-shaft glued stator structure of a high-speed motor; the structure is a shaft-embracing permanent magnet integrated structure; the rotor structure comprises a permanent magnet (), an output shaft () which is connected with one end of the permanent magnet () and embraces one part of the permanent magnet (), and a rear shaft () which is respectively connected with the other end of the permanent magnet () and the output shaft (), used for embracing the other part of the permanent magnet (), and connected with the output shaft () to form a sealing mechanism of the permanent magnet (). Compared with the prior art, the present invention has advantages of good electro-magnetic performance, high reliability, high productivity and good concentricity.

Shaft-embracing permanent magnet inter-shaft glued rotor structure of high-speed motor

The present invention relates to a hollow cup winding capable of reducing distribution coefficient, comprising N phases of windings, where each phase of the windings consists of k (360/k/N)&#xb0; coil units and the k coil units constitute of backing coil assemblies and forward coil assemblies. Compared with the prior art, the present invention has the advantages of improving motor performance and of being highly universal.

Hollow cup winding capable of reducing distribution coefficient

A controller of a brushless DC electric machine having a rotor and at least a stator winding powered by a driving voltage is provided. The controller includes a position sensor, an advance angle control circuit, and a driving circuit. The position sensor is moved along a reverse rotating direction of the rotor by a prepositioned angle for outputting a position signal. The advance angle control circuit receives the position signal and a driving voltage reproduction signal reproduced from the driving voltage and outputs a commutation control signal lagging the position signal by a first delay time. The driving circuit receives the commutation control signal for outputting a driving signal for controlling a commutation of the brushless DC electric machine.

Device and method for controlling brushless DC electric machine

A permanent magnet motor is provided. The permanent magnet motor includes a stator having a stator shaft having an outer surface, K salient teeth formed upon the outer surface, and K winding slots formed among the K salient teeth, and a rotor having a first inner surface facing the outer surface, and P pairs of permanent magnets formed on the first inner surface, each of which has a second inner surface facing the outer surface and at least a groove formed on the second inner surface to reduce a cogging torque.

Permanent magnet rotary structure of electric machine

The method and circuit for controlling a sensorless single-phase BLDCM having a stator with a winding are proposed. The provided controlling circuit includes a power supply circuit, an inverter coupled to the winding and the power supply circuit, a BEMF detecting circuit coupled to the winding and the inverter and measuring a BEMF of the winding, and a controller coupled to the power supply circuit, the inverter and the BEMF detecting circuit and analyzing a status of the BEMF to control the BLDCM accordingly. The provided method is based on the motor winding time-sharing theory, and the controller controls the inverter to make the winding used as a driving element with loading current when the absolute value of the BEMF is relatively large and as a sensing element when the absolute value of the BEMF is relatively small.

Method and circuit for controlling sensorless single-phase BLDCM

A method for starting a motor having a stator, a rotor, a winding and an asymmetrical air gap is accomplished using several steps. The steps include: (a) providing the motor at standstill; (b) exciting the winding for a specific time period with a current impulse having a first amplitude to obtain a first specific position of the rotor with respect to the stator; (c) decreasing the first amplitude down to a second amplitude gradually by a controller to make the rotor to be positioned at a second specific position with respect to the stator after the specific time period, wherein the second amplitude is one of zero ampere and a specific value close to zero ampere, and the rotor is rotating close to the second specific position with an almost zero rotating speed when the second amplitude is reached.

Method for starting single phase BLDCM having asymmetrical air gap

The methods for starting a Hall-less single-phase BLDCM having an asymmetrical air gap are proposed. The provided methods are employed to input a specific amount of current impulse and stop the current impulse at a specific time such that the rotor of the single-phase BLDCM having an asymmetrical air gap can be realized to rotate in the pre-determined direction through one of the cogging torque and the rotor inertia after that specific time so as to accomplish the normal starting of a motor without the Hall-effect sensor.

Growing community of inventors

Shanghai, China

Wanbing Jin